ORCID Profile
0000-0002-5342-9324
Current Organisations
University of Adelaide
,
Vietnam National University Ho Chi Minh
,
Ho Chi Minh City University of Technology
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Publisher: Informa UK Limited
Date: 23-04-2021
Publisher: American Chemical Society (ACS)
Date: 16-02-2018
Abstract: Arsenic contamination in groundwater is pervasive throughout deltaic regions of Southeast Asia and threatens the health of millions. The speciation of As in sediments overlying contaminated aquifers is poorly constrained. Here, we investigate the chemical and mineralogical compositions of sediment cores collected from the Mekong Delta in Vietnam, elucidate the speciation of iron and arsenic, and relate them to the sediment depositional environment. Gradual dissolution of ferric (oxyhydr)oxides with depth is observed down to 7 m, corresponding to the establishment of reducing conditions. Within the reduced sediment, layers originating from marine, coastal or alluvial depositional environments are identified and their age is consistent with a late Holocene transgression in the Mekong Delta. In the organic matter- and sulfur-rich layers, arsenic is present in association with organic matter through thiol-bonding and in the form of arsenian pyrite. The highest arsenic concentration (34-69 ppm) is found in the peat layer at 16 m and suggests the accumulation of arsenic due to the formation of thiol-bound trivalent arsenic (40-55%) and arsenian pyrite (15-30%) in a paleo-mangrove depositional environment (∼8079 yr BP). Where sulfur is limited, siderite is identified, and oxygen- and thiol-bound trivalent arsenic are the predominant forms. It is also worth noting that pentavalent arsenic coordinated to oxygen is ubiquitous in the sediment profile, even in reduced sediment layers. But the identity of the oxygen-bound arsenic species remains unknown. This work shows direct evidence of thiol-bound trivalent arsenic in the Mekong Delta sediments and provides insight to refine the current model of the origin, deposition, and release of arsenic in the alluvial aquifers of the Mekong Delta.
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012024
Abstract: The reverse osmosis (RO) water desalination system powered by the photovoltaic (PV) unit is commonly used to produce drinking water due to their reasonable price. This review focused to display different designs of small-scale PV powered brackish water RO (PV-BWRO) systems that were installed to improve the water productivity at remote areas. The configuration of BWRO units, which determined the operating cost, permeate flow and amount of rejected water, is of great concerns in this work. The specific energy consumption (SEC), total capital cost and water production cost are also analysed to display the feasibility of application of PV unit for small-scale BWRO desalination system. The single-stage configuration was suitable for most of small-scale BWRO systems owning high recovery rates (i.e., higher than 50%). The PV solar system pairing with batteries was not recommended at production capacities below 5 m 3 for their high cost and short lifetime. Independently operated PV-BWRO systems required the highest capital cost while produced the lowest operating and overall production costs compared to hybrid systems.
Publisher: Springer International Publishing
Date: 06-10-2018
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012025
Abstract: Vietnam’s urban areas have faced with serious environmental pollution issues, including: water pollution, municipal waste and air pollution. Air in Ho Chi Minh city is polluted by PM 2.5 (particle matter with the diameter is less than 2.5 μm, so-called PM 2.5 ), O3, CO, NO2 and TSP which greatly affects public health. In 2017, Ho Chi Minh City (HCMC) had 8,640,000 inhabitants with a total of 7,339,552 motorcycles and 637,323 automobiles. There are about 2,500 factories, 2,061,957 household and 5,096 restaurants in the city. The aim of this study is to (i) conduct a detailed air pollution emission inventory for PM 2.5 (ii) stimulate PM 2.5 ’s dispersion in HCMC and (iii) propose mitigation measures for PM 2.5 in the city. Simulations of air pollution were conducted in HCMC by using TAPM-CTM system model. The model performance was evaluated using observed meteorological data at Tan Son Hoa station and air quality data at the Ho Chi Minh City University of Science. The result states that the sum of air pollutants from main sources of disposal in HCMC is 3,978.32 ton of PM 2.5 in 2017. Average maximum 1 hours, 24 hours and annual of PM 2.5 concentration in 2017 does not exceed QCVN 05:2013/BTNMT, but it is 1.3 to 2.3 times higher than the WHO’s guideline. Therefore, the PM 2.5 in HCMC impacts on public health of HCMC. To control and manage the air’s quality and minimize the generation of PM 2.5 in HCMC there are possible solutions such as the control of air pollutants from the main source, the creation of encouraging policy, the regulation of air pollutants in HCMC and the raising people’s awareness of environmental protection.
Publisher: American Chemical Society (ACS)
Date: 07-08-2019
Abstract: Peat layers within alluvial sediments are considered effective arsenic (As) sinks under reducing conditions due to the binding of As(III) to thiol groups in natural organic matter (NOM) and the formation of As-bearing sulfide phases. However, their possible role as sources of As for anoxic groundwaters remains unexplored. Here, we perform laboratory experiments to provide evidence for the role of a sediment peat layer in releasing As. Our results show that the peat layer, deposited about 8,000 years ago in a paleomangrove environment in the nascent Mekong Delta, could be a source of As to porewater under reducing conditions. X-ray absorption spectroscopy (XAS) analysis of the peat confirmed that As was bound to NOM thiol groups and incorporated into pyrite. Nitrate was detected in peat layer porewater, and flow-through and batch experiments evidenced the release of As from NOM and pyrite in the presence of nitrate. Based on poisoning experiments, we propose that the microbially mediated oxidation of arsenic-rich pyrite and organic matter coupled to nitrate reduction releases arsenic from this peat. Although peat layers have been proposed as As sinks in earlier studies, we show here their potential to release depositional- and/or diagenetically-accumulated As.
Publisher: Springer International Publishing
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 20-08-2019
DOI: 10.1007/S10653-019-00400-9
Abstract: Groundwater is a primary freshwater source for various domestic, industrial and agricultural purposes, especially in coastal regions where there are lacking surface water supply. However, groundwater quality in coastal regions is often threatened by seawater intrusion and contamination due to both anthropogenic activities and natural processes. Therefore, insights into groundwater geochemistry and occurrences are necessary for sustainable groundwater management in coastal regions. The main aim of this study is to investigate the hydrogeochemical characteristics and their influencing factors in a coastal area of the Mekong Delta, Vietnam (MD). A total of 286 groundwater s les were taken from shallow and deep aquifers for analyzing major ions and stable isotopes. The results show that deep groundwater is dominated by Ca-HCO[Formula: see text], Ca-Na-HCO[Formula: see text], Ca-Mg-Cl, and Na-HCO[Formula: see text] while shallow groundwater is dominated by the Na-Cl water type. In this region, the main geochemical processes controlling groundwater chemistry are ion exchanges, mineralization and evaporation. Groundwater salinization in coastal aquifers of the Mekong Delta is caused by (1) paleo-seawater intrusion and evaporation occurring in the Holocene and Pleistocene aquifers, (2) dissolution of salt sediment/rock and leakage of saline from upper to lower aquifers due to excessive groundwater exploitation and hydraulic connection. High nitrate concentrations in both shallow and deep aquifers are related to human activities. These results imply that groundwater extraction may exacerbate groundwater quality-related problems and suitable solutions for sustainable groundwater management in the coastal area of the Mekong Delta are needed.
Publisher: MDPI AG
Date: 29-03-2021
DOI: 10.3390/ANI11040950
Abstract: Human–animal interactions (HAIs) can be beneficial for humans in a number of ways, and interactions with wild animals may contribute to human mental wellbeing, partly through nature connectedness. This study applies the “Nature Interaction Pattern” approach (proposed by Kahn and colleagues) to characterize the structure of meaningful human engagement with nature and animals, and to consider the wellbeing outcomes. This qualitative, retrospective study uses open responses from 359 participants who describe how their wild animal encounters affected their nature connectedness. Thematic analysis explores five nature Interaction Patterns and four resulting Psychological Descriptions that occur in the portrayals of the marine animal encounters and these are described using representative quotes. Feelings of love, belonging, positive feelings, fulfillment and the gaining of perspective, were linked with the human–animal experience and the Interaction Patterns. These findings suggest that when people encounter and interact with animals in their natural environment, their mental health and wellbeing may be enhanced. Further, through connecting with nature and animals, reciprocity may occur, that is, when people connect with nature and animals, they can also give back. Within this interaction there becomes an entanglement of experiences thereby encouraging caring for nature and animals.
Publisher: Elsevier BV
Date: 11-2021
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012018
Abstract: Groundwater in Xuyen Moc district is currently exploited for many purposes such as irrigation, domestic, production and livestock activities. In this study, the health risk assessment (HRA) method was used to determine the risks of public health for local people consuming groundwater for their domestic purposes by using the hazard quotient (HQ). This method calculated HQ of parameters exceeding the allowable limit in drinking water through monitoring data and the survey of households in the study area. Fourteen (14) groundwater s les were collected in the dry and wet seasons in 2017. Eleven (11) water quality parameters (pH, total hardness, TDS, SO 4 2- , Cl − , NO 3 − , F − , Mn 2+ , Fe 2+ , Zn 2+ and Pb) were selected for analysis. Results of calculation of HQ showed that fluoride is a parameter affecting the health of children when using groundwater for a long-term (HQ 1). HQ values ranged from 1.9 to 2.2 through ingestion of water and HQ through the dermal absorption ranged from 4.710 −4 - 8.610 −4 .
Publisher: Informa UK Limited
Date: 11-2016
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012022
Abstract: Vietnam attracts many tourists owing to its unique and erse geological landscapes. The Vietnam tourism development strategy until 2030 sets a target to make tourism a more sustainable economic sector, in which the advantages of natural resources and development of a variety of tourism products are promoted. Binh Thuan province in central-south Vietnam, hosts many high potential geosites including Mui Ne Red Dunes. Although this is a popular tourist destination, there is no clear tourism strategy for this site and local communities now regulate tourism in an unsustainable way. Online comments from review databases (TripAdvisor and Google reviews) are analysed to find themes in tourism perceptions after a visit to the Red Sand Dunes. Main themes are found that negatively affect tourist perceptions, such as the extended pollution of the dunes, theft reports and disturbance by jeeps, ATV’s and motorbikes. Many tourists recommend that this site should be better managed. To conserve this area in the future, the development of an all-inclusive local geopark is suggested, based on the tourism perceptions and previous studies assessing this landscape. This strategy is adapted from the UNESCO geopark framework and an ex le of a recently established local sand dune geopark in Taiwan is discussed. Implementing a local geopark, following the steps described in this study, can be beneficial for sustainable development and local communities in this area, while also promoting environmental education and enhancing disaster risk reduction.
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012023
Abstract: Industrial factories have been addressed as the main contributor to the amount of air pollution in many urban areas around the world. The emissions of air pollutants from factories, combined with exhausted gases from automobile and domestic cooking activities, have placed enormous adverse effects on human health. Recently, air quality models, which usually figure out for industrial emission with representative indicators such as CO, NO 2 , SO 2 , and TSP, have triggered an application to identify a suitable isolation distance that could lessen affection on public health. Concerning to develop an air emission inventory for Tan Tao Industrial Park (IP) for three sources of points, line and area sources by using top-down and bottom-up approaches, this study aim to: (i) apply a system model of TAPM – AERMOD model to study the air pollution dispersion from the IP to the surrounding area, and (ii) identify a hygiene isolation distance for sensitive objects around industrial park, especially zones of community, based on their separating demand from contamination. Results show that the point sources are the dominant air emission sources of Tan Tao IP. Total emissions of Tan Tao IP in 2019 estimated at 413.15 tons of TSP/year, 280.9 tons of NO 2 /year, 621.99 tons of SO 2 /year, and 2720.21 tons of CO/year. Modeling results show that 1-hour maximum concentration of TSP, NO 2 , SO 2 , and CO in the simulation area is 581µg/m 3 , 4.069µg/m 3 , 5.478µg/m 3 , 40.695µg/m 3 , respectively, exceeding the standards. Especially, the pollution levels of NO 2 were 20 times higher than the limit value, similar trends for SO 2 (15 times higher). The hygiene isolation distance was suggested a widely ranged from 2910 meters in the North-West and in the rest directions of Ho Chi Minh City. Some sensitive objects such as residential areas, hospitals and kindergartens recently are inside the affected zone should be reckoned to have suitable solutions that keep their health safe. The method for calculation of hygiene isolation distances from industrial activities has a significant guiding not only for environmental safety action but also for public health protection.
Publisher: IntechOpen
Date: 12-10-2021
Abstract: The Mekong River (MR) is recognized the 12th biggest rivers in the world. The Mekong watershed is the biggest one in Southeast Asia (795,000 km2), is densely populated (70 million people), is considered as the most productive one in Southeast Asia and is economically essential to the region. However, nowadays, the Lower Mekong River (LMR) and its delta are facing several emerging and critical anthropogenic stressors (dams construction, climate change, water poor quality, delta sinking). This review attempts to: (i) present the Mekong regional characteristics (geography, topological settings, climatic conditions, hydrology, demographic features and the anthropogenic activities), (ii) present the different factors that endanger the LMR, including the dam’s impacts, the climate change, the delta subsidence, and the degradation of the water quality, (iii) make comparison with different big rivers around the world and (iv) promote future decisions in order to minimize the negative impacts and seek for a trajectory that assures well-being and sustainability. International consultation and cooperation leading to sustainable management is now of a pivotal importance to try to avoid the deterioration of the LMR and its delta.
Publisher: Japan Society of Hydrology and Water Resources
Date: 2016
DOI: 10.3178/HRL.10.60
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012008
Abstract: Groundwater serves as the major source for drinking water and the only fresh water source in the dry season in Ca Mau province, the Vietnamese Mekong Delta. The study is performed to assess groundwater quality in the area. Groundwater Quality Index (GWQI), magnesium hazard (MH), sodium percentage (Na%), sodium adsorption ratio (SAR), permeability index (PI) combined with geostatistical tools were conducted by using groundwater quality data from 400 s les collected from private wells. GWQI values suggest that 7%, 63%, 28%, 2%, 1% of total s les are classified into excellent, good, poor, very poor and unsuitable for drinking water. High Cl and TDS are the main cause of high GWQI values suggesting that saltwater intrusion deteriorates groundwater quality. For irrigation purposes, 4%, 17%, 36%, 43% of total s les classify into Good, Permissible, Doubtful, Unsuitable respectively by Na% indicator 55.0%, 30.9%, 11.9%, 2.2% of total s les is Excellent, Good, Doubtful and Unsuitable according to SAR, 54% s les are unsuitable by MH index, and all s les are good by PI. This study provides useful information on groundwater quality for various purposes in Ca Mau province, that could help water management and water users to identify the necessary approach for groundwater protection and water-treatment methods before utilising the groundwater source for specific purposes in the study area.
Publisher: American Chemical Society (ACS)
Date: 07-09-2017
Abstract: Methylated arsenic (As) species represent a significant fraction of the As accumulating in rice grains, and there are geographic patterns in the abundance of methylated arsenic in rice that are not understood. The microorganisms driving As biomethylation in paddy environments, and thus the soil conditions conducive to the accumulation of methylated arsenic, are unknown. We tested the hypothesis that sulfate-reducing bacteria (SRB) are key drivers of arsenic methylation in metabolically versatile mixed anaerobic enrichments from a Mekong Delta paddy soil. We used molybdate and monofluorophosphate as inhibitors of sulfate reduction to evaluate the contribution of SRB to arsenic biomethylation, and developed degenerate primers for the lification of arsM genes to identify methylating organisms. Enrichment cultures converted 63% of arsenite into methylated products, with dimethylarsinic acid as the major product. While molybdate inhibited As biomethylation, this effect was unrelated to its inhibition of sulfate reduction and instead inhibited the methylation pathway. Based on arsM sequences and the physiological response of cultures to media conditions, we propose that amino acid fermenting organisms are potential drivers of As methylation in the enrichments. The lack of a demethylating capacity may have contributed to the robust methylation efficiencies in this mixed culture.
Publisher: Informa UK Limited
Date: 07-05-2014
Publisher: Ministry of Science and Technology, Vietnam (VMOST)
Date: 30-03-2019
DOI: 10.31276/VJSTE.61(1).74-81
Abstract: In recent years, activities related to socio-economic development have led to land cover (LC) changes in the upper part of the Dong Nai river basin. The use of remote sensing applications to analyse the impacts of these changes plays an important role in the managing the sustainability of theriver basin. This paper introduces a solution for analysing the impacts of LC changes on the water balancein the upstream catchment of the Dong Nai river in Lam Dong province. Landsat images were used for mapping and monitoring major changes over the last 20 years. Rainfall and water discharge data was collected from the local hydrometeorological stations to identify the impacts of the LC changes on the runoff in the catchment area. The results show that the forest area was reduced by more than 223,576 ha (23%). The main changes were an increase in the agricultural area from 18.2 to 31.3% and in water bodies from 0.9 to 2.2%. The latter was due to hydropower development projects in the catchment area. The LC changes caused by the changes in the hydrological conditions of the river basin have had a significant impact on water resources. The identification of the main LC changes in the catchment area could be useful for establishing a policy to protect the headwater forests and mitigate against future impacts.
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012012
Abstract: In recent years, Ho Chi Minh City has been faced with stark challenges in urban flooding affected by the impact of climate change in associated with the rapid urbanization and unadequate urban planning. Although many flood mitigation solutions were invested and implemented such as upgrading drainage systems, transport infrastructure, flood control pumps, etc. the problem remains unsolved and even worse. The purpose of this study is to propose a calculation model of the sustainable urban drainage system (SuDS) integrated with of GIS and remote sensing technology to assess and predict flooding degree in a specific basin in HCMC. Further, the results of this calculation model are just a pre-testing and pre-simulation of the proposed model for future studies on the application of sustainable urban drainage techniques, including rainwater harvesting, green roofs, urban green space and pervious pavement.
Publisher: Springer Singapore
Date: 2022
Publisher: Springer International Publishing
Date: 2023
Publisher: Elsevier BV
Date: 02-2021
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012009
Abstract: Vietnam is a country that is heavily affected by global climate change, with the coastal zone and low-lying river deltas being especially vulnerable. The coastal zone has rapidly evolved over the past few decades, as coastal tourism and other social-economic developments and industries all seek fortune and exploit resources in this area. Along with this rapid economic growth, the coastal zone has suffered severe impacts of both human activities and global climate change, resulting in an increasing number of coastal hazards, such as typhoons, floods, saline intrusion, and coastal erosion. The purpose of this paper is to identify natural and human factors that affect coastal erosion through case studies in the south-central coastline. Measures for minimizing threats to both socio-economic activities and the surrounding natural environments are brought forward, in which integrated coastal zone management approach plays a key role. In addition to addressing the issues and potential management strategies, selected coastal areas in Vietnam characterized by severe coastal erosion are studied in terms of coastline dynamics, changing beach morphologies and coastal engineering structures through on-site measurements and aerial images. Seasonal variations and changing beach morphologies after the construction of coastal engineering works are clearly visible.
Publisher: Springer Science and Business Media LLC
Date: 08-09-2021
DOI: 10.1007/S11356-021-16282-3
Abstract: Groundwater salinization is one of the most severe environmental problems in coastal aquifers worldwide, causing exceeding salinity in groundwater supply systems for many purposes. High salinity concentration in groundwater can be detected several kilometers inland and may result in an increased risk for coastal water supply systems and human health problems. This study investigates the impacts of groundwater pumping practices and regional groundwater flow dynamics on groundwater flow and salinity intrusion in the coastal aquifers of the Vietnamese Mekong Delta using the SEAWAT model-a variable-density groundwater flow and solute transport model. The model was constructed in three dimensions (3D) and accounted for multi-aquifers, variation of groundwater levels in neighboring areas, pumping, and paleo-salinity. Model calibration was carried for 13 years (2000 to 2012), and validation was conducted for 4 years (2013 to 2016). The best-calibrated model was used to develop prediction models for the next 14 years (2017 to 2030). Six future scenarios were introduced based on pumping rates and regional groundwater levels. Modeling results revealed that groundwater pumping activities and variation of regional groundwater flow systems strongly influence groundwater level depletion and saline movement from upper layers to lower layers. High salinity (>2.0 g/L) was expected to expand downward up to 150 m in depth and 2000 m toward surrounding areas in the next 14 years under increasing groundwater pumping capacity. A slight recovery in water level was also observed with decreasing groundwater exploitation. The reduction in the pumping rate from both local and regional scales will be necessary to recover groundwater levels and protect fresh aquifers from expanding paleo-saline in groundwater.
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012006
Abstract: Saltwater intrusion is widely observed in coastal aquifers because fresh groundwater is over exploited and abstraction wells were installed too close to saltwater intrusion zone. Identification of salt/fresh groundwater interface is important for fresh groundwater protection. This study presents an application of combination groundwater investigation methods including vertical electric sounding (VES), geochemistry and geographic information system (GIS) tools for delineation of salt/fresh groundwater interface in Mekong Delta. Twenty-seven groundwater s les are collected in existing wells for chemical analysis. Vertical electric sounding (VES) method was conducted for 37 sites to delineate freshwater zone (TDS g/L) and saline groundwater zone (TDS g/L). Two new wells are also installed after VES measurement for groundwater s ling. Result of geochemical analysis show that TDS values of groundwater s les range from 0.25 g/L to 1.3 g/L and Cl from 8.8 to 758.6 mg/L. Electrical resistivity values range from 2 to 18.4 Ωm. The electrical resistivity values less than 10.4 Ωm is well correlated to saline groundwater. The study shows that even though VES can be an effective tool for identification of fresh/saline groundwater distribution, the method could not identify the saltwater intrusion zone. Combination of geochemical and GIS methods can clearly delineate saltwater intrusion zone. The study results show that fresh groundwater is limited in a small area of upper-middle Pleistocene aquifers. The fresh groundwater is highly affected by salinization. Therefore, the area urgently needs to take proper measures for sustainable groundwater development.
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012010
Abstract: Arsenic contaminated groundwaters is a global environmental issue which cause serious problems for human health risks. 188 groundwater s les were collected in private wells of Lam Dong Province, a central highland area, Vietnam to investigate the health risks to the local people by using arsenic contaminated groundwater for drinking purpose. The result showed that the arsenic concentration is average of 14 μg/L and maximum of 500 μg/L. About 12% out of the total groundwater s les have arsenic concentration exceeded that value of 10 μg/L recommended for drinking water by World Health Organization (WHO, 2019). The health risk assessment showed that hazard quotient (HQ) value for adults was up to 60.6 with an average of 1.7 and about 14% of total s les show the HQ values greater than 1. The HQ value for children is average of 4.7 (maximum of 166.7) and about 23% of total groundwater s les show HQ 1 for children. Cancer risk (CR) values were up to 27x10 -4 (average of 8x10 -4 ) for adults and 75x10 -4 (average of 21x10 -4 ) for children. About 26% and 29% of out of the total s les show CR value for adult and children greater than the CR (1×10 -4 ) proposed by the USEPA. The result also indicated that the consumption of arsenic contaminated groundwater may seriously damage the human health. Therefore, groundwater in the area needs to be treated for arsenic removal before drinking to minimize the adverse effect on local communities’ health.
Publisher: IOP Publishing
Date: 02-2021
DOI: 10.1088/1755-1315/652/1/012005
Abstract: Groundwater in the Southeastern coastal region of Vietnam is exploited for many purposes, including irrigation, livestock, domestic and production activities. In this study, Groundwater Quality Index calculated by Entropy weight method (EWQI) and Geographic Information System (GIS) are applied for zoning water quality through determining the weight of each parameter in accordance with the variation of each value in terms of. Spatial distribution the suitability of groundwater use in the study area. Groundwater s les were collected from 46 wells in the dry and wet seasons in 2018 for analyzing seven selected water quality parameters, including: pH, total dissolved solids (TDS), total hardness (TH), ammonium (NH 4 + -N), nitrate (NO 3 − -N), sulphate (SO 4 2- ) and ferrous (Fe 2+ ). The groundwater quality is ided into five (05) categories corresponding to Entropy Water Quality Index (EWQI), comprising: excellent, good, medium, poor and extremely poor. The analysis results of Entropy weight indicated that pH, NH 4 + -N, NO 3 − -N are the most affected on the quality of groundwater at the study area. According to EWQI results, more than 41.30% of wells’ water quality are “very good” in both the dry and wet seasons, mainly in the coastal of Ba Ria - Vung Tau province and 13.04% of the total surveyed wells in the study area are “extremely poor”, mainly in Ho Chi Minh city. Accordingly, the zoning map of Entropy weighted Water Quality Index (EWQI), showed that the area with good quality of groundwater accounts for 34.3% and 37.72% of the total study area in the dry and the rainy season, respectively.
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/011001
Abstract: Le Van Trung, Vo Le Phu, Armando A. Apan, Marc Descloitres, Tanita Suepa, Nguyen Nhat Huy, Ho Tuan Duc, Ha Quang Khai, Pham Tan Thi (Editors) Environment, Resources, and Earth Sciences Proceedings of the International Conference on Environment, Resources, and Earth Sciences 2021 (ICERES 2021) List of Environment, Resources, and Earth Sciences, Preface, List of Scientific Committees are available in this pdf.
Publisher: Informa UK Limited
Date: 03-10-2019
DOI: 10.1080/10256016.2019.1673746
Abstract: The stable isotopes of oxygen and hydrogen can provide useful insights into water origin and hydrological processes. The present study aims to investigate the characteristics of stable H/O isotopes of groundwater and surface water in a coastal area of the Vietnamese Mekong Delta. Isotopes and chloride concentrations of surface water show a highly seasonal and linearly spatial variability, depending on the distance to the sea. The seasonal variation of upstream discharge and rainfall plays an important role in changes of the isotopic compositions and chloride concentrations. Tide also influences on chloride concentrations of surface water while it does not change the isotopic compositions. Evaporation plays a crucial role in changes of isotopic compositions, while the influence of freshwater/seawater mixing on isotopic variabilities is negligible. Groundwater has a spatial heterogeneity in isotopic compositions and chloride concentrations, reflecting different recharge sources and seawater intrusion processes. Groundwater in shallow aquifers originates from rainfall and surface water with small evaporative losses, and it experienced different magnitudes of mixing with seawater. Groundwater in deep aquifers might be recharged by open-surface water evaporation in the last glacial age with minor impacts of seawater intrusion on these aquifers.
Publisher: Elsevier BV
Date: 2019
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012014
Abstract: In recent years, local livelihood activities in the Can Gio district have increased significantly, including aquaculture practices, aquaculture cultivation, salt-works, forest guard, farming, livestock, tourism, and etc. These livelihood activities have contributed remarkably to the local economy and the improvement of living conditions for local people. However, the burgeoning development of these activities have posed negative impacts on the mangrove ecosystem in Can Gio. In which, the use and exploitation of existing human and natural resources are paid inadequate attention. The purpose of this study is to identify livelihoods by conducting a survey with 536 questionnaire s les in both the buffer and transition zones in Can Gio Mangrove Forest. In addition, the quality of surface water sources was examined by collecting 70 surface water and wastewater s les. The results show that the quality of surface water meets the allowable limits of QCVN 08-MT:2015/BTNMT. The extent of the impact from livelihood activities on the environment of mangrove forest is at the medium level. However, the livelihood of aquaculture cultivation practices has the most affect on the environment and natural resources and is posing negative impacts on the quality of water sources in Can Gio Mangrove Forest. Therefore, these findings will be useful information for decision makers of the local authority in building an appropriate planning for aquaculture cultivation area. Further, irrigation and drainage systems for aquaculture practices need to be invested to control and handle wastes from aquaculture cultivation areas.
Publisher: IGI Global
Date: 2022
DOI: 10.4018/978-1-7998-9190-1.CH005
Abstract: Both natural and anthropogenic forces could play significant roles in coastal erosion in Western Taiwan and Central Vietnam's coastlines. Intensive socio-economic development, sea level rise, more frequent and strong intensity of disasters are predicted to occur in a future of global climate change, which poses an urgent need for coastal hazard management strategies. This chapter describes main causes and discusses the applied engineering interventions to reduce coastal erosion at these sites. Hard engineering structures are often constructed in these areas, but they seem to be merely short-term costly solutions and have a negative impact on the coastal environment and its residents. Nature-based solutions and soft engineering approaches are proposed, which seem to be sustainable and less expensive than hard engineering options. These possible future solutions can be applied in coastal settings to meet the principles of sustainable and humanitarian engineering with multiple benefits to reduce the risk and negative impacts on both humans and the environment.
Publisher: Elsevier BV
Date: 02-2022
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012018
Abstract: Global warming is anticipated to induce an increase in the frequency and intensity of hot days and heatwaves, which ultimately have effects on public health. The study aimed to identify the impacts of high temperature and developing climate forecasting projections focused on cardiovascular causes in Ho Chi Minh city (HCMC). The projections were built up based on updated climate scenarios in HCMC. Poisson regression model combined with a distributed lag non-linear model (DLNM) was applied. The forecasting model for cardiovascular causes was performed by using the Global Climate Model (GCM) and Yasushi Honda model. Result showed that the average daily temperature induces an increase in the risk of hospitalisation, in which temperature below 25.7°C reduced number of patients due to cardiovascular disease, meanwhile temperature above 25.7°C has increased hospitalisations. Heat waves over 31°C had the strongest impact on the 60 years old elderly people after 5 days lag and decreased its impact consecutively to age groups of 41 to 60, 16 to 40, and less than 15 years old. The incremental prediction for the hospitalised cardiovascular disease cases based on the RCP4.5 scenario was 79,713 cases and based on the RCP8.5 scenario was 81,362 cases, respectively.
Publisher: Elsevier BV
Date: 08-2021
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/964/1/012016
Abstract: Hand, foot, and mouth disease (HFMD) is one of the most common communicable diseases in Vietnam. The present study aims to examine the association between weather factors and HFMD in association with hospitalisation. Daily and weekly weather and HFMD data from 2013 to 2018 in Ho Chi Minh City were deployed. Poisson regression model combined with a distributed lag non-linear model (DLNM) was applied to examine the relationship between weather factors and HFMD. The forecasting model for HFMD was performed by using the Global Climate Model (GCM) and Yasushi Honda model. The result showed that the average daily temperature induces an increase in the risk of HFDM hospitalisation was 26°C- 30.1°C. The average daily humidity also caused increasing the risk of hospitalisation of HFMD was 75% - 85%. However, the average daily humidity % reduced the risk of getting HFMD. The study provides quantitative evidence that the incidence of HFMD cases was associated with meteorological variables including average daily temperature and daily humidity in Ho Chi Minh City. This findings implies that there is a need for building a public health policy for eliminating and mitigating climate change impact on community health in a resilient approach.
Location: Viet Nam
Location: No location found
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