ORCID Profile
0000-0003-2686-1362
Current Organisation
Zayed University
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Publisher: Wiley
Date: 27-05-2014
DOI: 10.1002/HYP.10212
Publisher: Elsevier BV
Date: 12-2010
Publisher: Wiley
Date: 06-1999
Publisher: Elsevier BV
Date: 02-2016
DOI: 10.1016/J.SCITOTENV.2015.11.106
Abstract: The expected geomorphic after-effects of the Mw 9.0 Tōhoku-oki earthquake of 11 March 2011 (eastern Japan) are summarized by a schematic model of seismic driving, which details seismogenic disturbances to sediment systems that affect the rate or timing of sediment delivery to coastlines over timescales of 10(2)-10(4)years. The immediate physical environmental responses to this high-magnitude earthquake included a large tsunami and extensive region-wide slope failures. Normally, slope failures within mountain catchments would have significant impacts on Japan's river and coastal geomorphology in the coming decades with, for ex le, a new beach ridge expected to form within 20-100 years on the Sendai Plain. However, human activity has significantly modified the rate and timing of geomorphic processes of the region, which will have impacts on likely geomorphic responses to seismic driving. For ex le, the rivers draining into Sendai Bay have been dammed, providing sediment traps that will efficiently capture bedload and much suspended sediment in transit through the river system. Instead of the expected ~1 km of coastal progradation and formation of a ~3m high beach ridge prior to the next large tsunami, it is likely that progradation of the Sendai Plain will continue to slow or even cease as a result of damming of river systems and capture of river sediments behind dams. The resulting reduction of fluvial sediment delivery to the coast due to modification of rivers inadvertently makes seawalls and other engineered coastal structures even more necessary than they would be otherwise.
Publisher: Informa UK Limited
Date: 29-01-2020
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 03-2017
Publisher: Geological Society of London
Date: 2012
DOI: 10.1144/SP361.1
Publisher: Geological Society of London
Date: 2012
DOI: 10.1144/SP361.2
Publisher: Elsevier BV
Date: 10-2013
Publisher: Elsevier BV
Date: 03-2004
Publisher: Wiley
Date: 17-10-2014
DOI: 10.1002/ESP.3485
Publisher: Elsevier BV
Date: 05-2012
Publisher: Inter-Research Science Center
Date: 09-2010
DOI: 10.3354/CR00912
Publisher: Wiley
Date: 27-02-2012
DOI: 10.1002/WEA.882
Publisher: Wiley
Date: 07-05-2015
DOI: 10.1111/WEJ.12116
Publisher: Informa UK Limited
Date: 06-2001
Publisher: Wiley
Date: 13-09-2021
DOI: 10.1002/RHC3.12237
Abstract: The COVID‐19 pandemic is the first global “NASECH disaster,” owing to its natural hazard (NH) origin and unprecedented subsequent repercussions for global society (S), economy (EC), and health (H). Emergency health control measures required the implementation of compulsory mass quarantine (CMQ) or so‐called periods of “lockdown.” Yet, CMQ is an instrument with iatrogenic consequences, associated with a rise in societal levels of depression, anxiety, and posttraumatic stress. With a view to informing future crisis management, the study investigated sociodemographic factors associated with mental wellbeing during the March–April 2020 lockdown in the United Arab Emirates. Respondents ( n = 1585) completed self‐report measures of depression (PHQ8) and generalized anxiety (GAD7). Rates of symptomatology were notably higher than those observed in similar UAE‐based studies before the pandemic. Younger age, urban‐dwelling, female‐gender, and a history of mental health problems were significant factors linked to elevated levels of depression and anxiety. Findings emphasize (1) the crucial need for psychological intervention after disasters and (2) the importance of strengthening the nexus at the intersection of public health and disaster risk reduction (DRR). Implications are that future pandemic containment would benefit from adopting new Health–DRR paradigms and ensuring these are effectively translated into disaster policy.
Publisher: Elsevier BV
Date: 08-2016
Publisher: Coastal Education and Research Foundation
Date: 28-04-2014
DOI: 10.2112/SI70-046.1
Publisher: Springer Science and Business Media LLC
Date: 28-10-2015
Publisher: CSIRO Publishing
Date: 1993
DOI: 10.1071/WF9930095
Abstract: The Agueda Basin, north-central Portugal is comparatively wet (rainfall, 1600-1800 mm/yr) with frequent, relatively large storms in autumn and winter yet the summer drought is sufficiently long and consistent for frequent forest wildfires. This paper discusses wildfire impacts in such a wet Mediterranean environment on soil hydrophobicity, infiltration capacity, overland flow coefficients, soil loss, rainsplash detachment and small-scale ground level changes for Eucalyptus globulus and Pinus pinaster forest: (1) 0-2 years after fire ('new' burn) (2) 3-4 years after fire ('old' burn) and (3) 'mature' (or long unburnt) sites. For 'new' burn sites, rainsplash detachment rates are an order of magnitude and soil losses two orders of magnitude higher than for 'old' burn sites and both are two orders of magnitude higher than for 'mature' sites. Soils are hydrophobic in all three categories of sites, but infiltration capacities are lower at 'new' burn and 'old' burn than at 'mature' sites. Overland flow coefficients on long unburnt sites were low while on burnt sites they were high and tended to be higher for summer and autumn than for winter and spring, implying enhanced hydrophobicity under summer drought conditions, causing decreased infiltration capacity and increased overland flow. The distinctiveness of fire effects on soil erosion and hydrology in this wet Mediterranean environment and implications for post-fire management are discussed.
Publisher: Wiley
Date: 12-2008
Publisher: Wiley
Date: 04-2022
DOI: 10.1002/WEA.4193
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 11-2020
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 2002
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 09-2018
Publisher: Wiley
Date: 2003
DOI: 10.1002/HYP.1186
Publisher: Elsevier BV
Date: 11-2015
Publisher: Wiley
Date: 03-2011
Publisher: Springer Science and Business Media LLC
Date: 25-12-2010
Publisher: Elsevier BV
Date: 09-2019
DOI: 10.1016/J.SCITOTENV.2019.04.069
Abstract: Typhoons have devastating impacts across many Asian countries. Vietnam is presently one of the most disaster-prone nations. Typhoons regularly disrupt human lives and livelihoods in various ways and cause significant damage. Making efficient policy decisions to minimize the vulnerability of affected communities is crucial. This requires a deep understanding of the factors that make a society vulnerable to extreme events and natural disasters. An appropriate approach is integrating the three dimensions of hazard, exposure and sensitivity, and community adaptive capacity. However, the vulnerability and adaptive capacity response to typhoons within Vietnam is poorly investigated. Here, we develop a conceptual framework that incorporates 21 indicators to identify vulnerability and adaptive capacity (VAC) using geospatial techniques at regional scales, applied over Vietnam. We find large spatial differences in VAC and are able to identify the top-priority regions that need to enhance their adaptation to typhoons. The Southern Coastal area, South East and Red River Delta demonstrate high and very high vulnerability because of their physical features and the intensity of typhoons that frequently cross these parts of Vietnam. The lower Mekong Delta and Northern Coastal areas are vulnerable to typhoon-driven flood threats, in particular where compounded by sea-level rise. Our framework successfully identified the spatial distribution and different levels of VAC within acceptable limits of uncertainty. It can therefore serve as a template to tackle national issues in disaster risk reduction in Vietnam and assist in the development of suitable mitigation strategies to achieve sustainable outcomes.
Publisher: Elsevier BV
Date: 05-2015
Publisher: Elsevier BV
Date: 12-2014
Publisher: Informa UK Limited
Date: 08-1999
Publisher: MDPI AG
Date: 16-01-2023
DOI: 10.3390/RS15020530
Abstract: Many regions worldwide suffer from heavy air pollution caused by particulate matter (PM2.5) and nitrogen dioxide (NO2), resulting in a huge annual disease burden and significant welfare costs. Following the outbreak of the COVID-19 global pandemic, enforced curfews and restrictions on human mobility (so-called periods of ‘lockdown’) have become important measures to control the spread of the virus. This study aims to investigate the improvement in air quality following COVID-19 lockdown measures and the projected benefits for environmental health. China was chosen as a case study. The work projects annual premature deaths and welfare costs by integrating PM2.5 and NO2 pollutant measurements derived from satellite imagery (MODIS instruments on Terra and Aqua, and TROPOMI on Sentinel-5P) with census data archived by the Organization for Economic Co-operation and Development (OECD). A 91-day timeframe centred on the initial lockdown date of 23 January 2020 was investigated. To perform the projections, OECD data on five variables from 1990 to 2019 (mean population exposure to ambient PM2.5, premature deaths, welfare costs, gross domestic product and population) were used as training data to run the Autoregressive Integrated Moving Average (ARIMA) and multiple regression models. The analysis of the satellite imagery revealed that across the regions of Beijing, Hebei, Shandong, Henan, Xi’an, Shanghai and Hubei, the average concentrations of PM2.5 decreased by 6.2, 30.7, 14.1, 20.7, 29.3, 5.5 and 17.3%, while the NO2 decreased by 45.5, 54.7, 60.5, 58.7, 63.6, 50.5 and 66.5%, respectively, during the period of lockdown restrictions in 2020, as compared with the equivalent period in 2019. Such improvements in air quality were found to be beneficial, reducing in 2020 both the number of premature deaths by approximately 97,390 and welfare costs by over USD 74 billion.
Publisher: Wiley
Date: 29-06-2010
DOI: 10.1002/WEA.618
Publisher: Elsevier BV
Date: 2006
DOI: 10.1016/J.JENVRAD.2005.07.004
Abstract: The (137)Cs method was employed to investigate the recent historical rate of sediment deposition on a lowland alluvial floodplain in the Falefa River basin, Upolu Island, Samoa. Caesium stratigraphy in the floodplain sediment profile was clearly defined, with a broad peak at 145-175 cm depth. The measured rate of vertical accretion over the last 40 years is 4.0+/-0.4 cm per year. This rate exceeds observations in humid environments elsewhere, but is similar to that recorded on other tropical Pacific Islands. Available flow data for the Vaisigano River in Samoa give a 'near-catastrophic' index value of 0.6 for flood variability. This is associated with the occurrence of tropical cyclones and storms in the Samoa area. Large floods therefore probably contribute to the high rate of floodplain sedimentation on Upolu Island. A small but growing body of evidence suggests that fluvial sedimentation rates on tropical Pacific islands are some of the highest in the world.
Publisher: Wiley
Date: 10-05-2019
Publisher: Springer New York
Date: 2007
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 27-09-2014
Publisher: Oxford University Press (OUP)
Date: 24-03-2021
DOI: 10.1093/BJS/ZNAB101
Abstract: Preoperative SARS-CoV-2 vaccination could support safer elective surgery. Vaccine numbers are limited so this study aimed to inform their prioritization by modelling. The primary outcome was the number needed to vaccinate (NNV) to prevent one COVID-19-related death in 1 year. NNVs were based on postoperative SARS-CoV-2 rates and mortality in an international cohort study (surgical patients), and community SARS-CoV-2 incidence and case fatality data (general population). NNV estimates were stratified by age (18–49, 50–69, 70 or more years) and type of surgery. Best- and worst-case scenarios were used to describe uncertainty. NNVs were more favourable in surgical patients than the general population. The most favourable NNVs were in patients aged 70 years or more needing cancer surgery (351 best case 196, worst case 816) or non-cancer surgery (733 best case 407, worst case 1664). Both exceeded the NNV in the general population (1840 best case 1196, worst case 3066). NNVs for surgical patients remained favourable at a range of SARS-CoV-2 incidence rates in sensitivity analysis modelling. Globally, prioritizing preoperative vaccination of patients needing elective surgery ahead of the general population could prevent an additional 58 687 (best case 115 007, worst case 20 177) COVID-19-related deaths in 1 year. As global roll out of SARS-CoV-2 vaccination proceeds, patients needing elective surgery should be prioritized ahead of the general population.
Publisher: Wiley
Date: 2021
DOI: 10.1111/IAR.12417
Abstract: For tsunami science within Oceania, the vast Central and Western Pacific (CEWEP) is an anomalous region because of the scarcity of historical tsunami observations and the complete absence of dated palaeotsunami evidence. This paper therefore records the first dated high‐magnitude palaeotsunami event within the CEWEP region. A combination of both geological data and oral history is provided for a palaeotsunami that struck remote Makin island, northernmost of the Gilbert Islands in Kiribati, toward the end of the 16th century. A previously undocumented oral tradition of giant waves is well known to the people of Makin. Narration of this legend by the Wiin te Maneaba , traditional storyteller on Makin, provided important details supporting a tsunami hypothesis. The legend preserves credible information surrounding the giant‐wave origin of Rebua and Tokia , two prominent subaerial megaclasts of blade and block geometry that were transported 80–130 m shorewards from the reef‐edge source and deposited in sideways and inverted orientations. From available hydrodynamic flow transport equations, minimum flow velocities of 7.3–16.3 m s −1 were generated, depending on whether the reefblocks were rotated or lifted onto the reef platform. The youngest U‐Th age‐dates for fossil corals retrieved from the reefblocks give a maximum age for the palaeotsunami of circa AD 1576. Several far‐field Pacific Rim and regional possibilities exist for tsunamigenesis. These include subduction‐zone seismicity and catastrophic volcanic eruption, both of which have been linked to earlier (late 15th century) palaeotsunami events recorded elsewhere in the Pacific Islands. However, the available evidence here suggests that the ~AD 1576 Makin palaeotsunami was more likely to have been locally generated by tsunamigenic offshore submarine slope failure close to Makin's western reef, associated with the giant arcuate bight structure that characterizes the northern rim of Butaritari atoll.
Publisher: SAGE Publications
Date: 12-12-2012
Abstract: April 2012 marked the 130th anniversary of the death of Charles Darwin. One of many significant contributions he made to science was the subsidence theory of atoll formation, which he penned on 12 April 1836 during the voyage of the Beagle through the Pacific. Darwin’s elegant theory, founded on the premise of a subsiding volcano and the corresponding upward growth of coral reef, was astonishing for the time considering the absence of an underpinning awareness of plate tectonics. His theory has endured until modern times in spite of a number of opposing ideas and permutations and has an enviable longevity amongst paradigms in geomorphology. Darwin frequently alluded to the generally circular morphology of the atoll shape, yet the reality is that many atolls are neither circular nor elliptical, instead possessing irregular morphologies. In particular, many exhibit major arcuate ‘bight-like’ structures (ABLS) in their plan form. These departures from the circular form are indicative of geomorphological processes that cannot be ignored. ABLS are the morphological expression of large submarine failures that are common on the slopes of volcanic edifices. Such failures can occur during any stage of atoll formation and are a valuable addition to Darwin’s theory because they indicate the instability of the volcanic foundations. Moreover, ABLS have fundamental implications for hazard research in the context of oceanic islands. Not only does our extension to the theory explain the ersity of atoll shape, but it also provides a mechanism for identifying a vast number of potential local tsunamigenic sources, which is critical for advancing modern understanding of tsunami hazards in oceanic environments.
Publisher: World Scientific Publishing Company
Date: 28-02-2010
DOI: 10.1142/7158-VOL16
Publisher: Elsevier BV
Date: 11-2009
Publisher: Springer Netherlands
Date: 2013
Publisher: Elsevier BV
Date: 07-2016
Publisher: Informa UK Limited
Date: 2002
Publisher: Project MUSE
Date: 2001
Publisher: Elsevier BV
Date: 11-2012
Publisher: Wiley
Date: 24-08-2021
DOI: 10.1111/ANAE.15563
Abstract: SARS‐CoV‐2 has been associated with an increased rate of venous thromboembolism in critically ill patients. Since surgical patients are already at higher risk of venous thromboembolism than general populations, this study aimed to determine if patients with peri‐operative or prior SARS‐CoV‐2 were at further increased risk of venous thromboembolism. We conducted a planned sub‐study and analysis from an international, multicentre, prospective cohort study of elective and emergency patients undergoing surgery during October 2020. Patients from all surgical specialties were included. The primary outcome measure was venous thromboembolism (pulmonary embolism or deep vein thrombosis) within 30 days of surgery. SARS‐CoV‐2 diagnosis was defined as peri‐operative (7 days before to 30 days after surgery) recent (1–6 weeks before surgery) previous (≥7 weeks before surgery) or none. Information on prophylaxis regimens or pre‐operative anti‐coagulation for baseline comorbidities was not available. Postoperative venous thromboembolism rate was 0.5% (666/123,591) in patients without SARS‐CoV‐2 2.2% (50/2317) in patients with peri‐operative SARS‐CoV‐2 1.6% (15/953) in patients with recent SARS‐CoV‐2 and 1.0% (11/1148) in patients with previous SARS‐CoV‐2. After adjustment for confounding factors, patients with peri‐operative (adjusted odds ratio 1.5 (95%CI 1.1–2.0)) and recent SARS‐CoV‐2 (1.9 (95%CI 1.2–3.3)) remained at higher risk of venous thromboembolism, with a borderline finding in previous SARS‐CoV‐2 (1.7 (95%CI 0.9–3.0)). Overall, venous thromboembolism was independently associated with 30‐day mortality (5.4 (95%CI 4.3–6.7)). In patients with SARS‐CoV‐2, mortality without venous thromboembolism was 7.4% (319/4342) and with venous thromboembolism was 40.8% (31/76). Patients undergoing surgery with peri‐operative or recent SARS‐CoV‐2 appear to be at increased risk of postoperative venous thromboembolism compared with patients with no history of SARS‐CoV‐2 infection. Optimal venous thromboembolism prophylaxis and treatment are unknown in this cohort of patients, and these data should be interpreted accordingly.
Publisher: Springer Science and Business Media LLC
Date: 28-06-2022
DOI: 10.1186/S40562-022-00232-Z
Abstract: January 2022 witnessed the violent eruption of Hunga Tonga–Hunga Haʻapai submarine volcano in the South Pacific. With a volcanic explosivity index possibly equivalent to VEI 5, this represents the largest seaborne eruption for nearly one and a half centuries since Indonesia’s cataclysmic explosion of Krakatau in AD 1883. The Tongan eruption remarkably produced ocean-wide tsunamis, never documented before in the Pacific instrumental record. Volcanically generated tsunamis have been referred to as a ‘blind spot’ in our understanding of tsunami hazards, particularly in the Pacific Ocean. This event therefore presents a unique opportunity for investigating the multiple processes contributing to volcanic tsunamigenesis. It is argued that, although challenges exist, integrating theoretical, observational, field and modelling techniques offers the best approach to improving volcanic tsunami hazard assessment across Oceania.
Publisher: Springer Science and Business Media LLC
Date: 07-2019
Publisher: MDPI AG
Date: 07-08-2019
DOI: 10.3390/RS11161843
Abstract: This study utilizes remote sensing imagery, a differential averaging technique and empirical formulas (the ‘Liou–Liu formulas’) to investigate three consecutive sets of dual-vortex interactions between four cyclonic events and their neighboring environmental air flows in the Northwest Pacific Ocean during the 2017 typhoon season. The investigation thereby deepens the current understanding of interactions involving multiple simultaneous/sequential cyclone systems. Triple interactions between Noru–Kulap–Nesat and Noru–Nesat–Haitung were analyzed using geosynchronous satellite infrared (IR1) and IR3 water vapor (WV) images. The differential averaging technique based on the normalized difference convection index (NDCI) operator and filter depicted differences and generated a new set of clarified NDCI images. During the first set of dual-vortex interactions, Typhoon Noru experienced an increase in intensity and a U-turn in its direction after being influenced by adjacent cooler air masses and air flows. Noru’s track change led to Fujiwhara-type rotation with Tropical Storm Kulap approaching from the opposite direction. Kulap weakened and merged with Noru, which tracked in a counter-clockwise loop. Thereafter, in spite of a distance of 2000–2500 km separating Typhoon Noru and newly-formed Typhoon Nesat, the influence of middle air flows and jet flows caused an ‘indirect interaction’ between these typhoons. Evidence of this second interaction includes the intensification of both typhoons and changing track directions. The third interaction occurred subsequently between Tropical Storm Haitang and Typhoon Nesat. Due to their relatively close proximity, a typical Fujiwhara effect was observed when the two systems began orbiting cyclonically. The generalized Liou–Liu formulas for calculating threshold distances between typhoons successfully validated and quantified the trilogy of interaction events. Through the unusual and combined effects of the consecutive dual-vortex interactions, Typhoon Noru survived 22 days from 19 July to 9 August 2017 and migrated approximately 6900 km. Typhoon Noru consequently became the third longest-lasting typhoon on record for the Northwest Pacific Ocean. A comparison is made with long-lived Typhoon Rita in 1972, which also experienced similar multiple Fujiwhara interactions with three other concurrent typhoons.
Publisher: Wiley
Date: 29-08-2011
DOI: 10.1111/J.1745-6584.2011.00860.X
Abstract: The principal natural source of fresh water on scattered coral atolls throughout the tropical Pacific Ocean is thin unconfined groundwater lenses within islet substrates. Although there are many threats to the viability of atoll fresh water lenses, salinization caused by large storm waves washing over in idual atoll islets is poorly understood. In this study, a mathematical modeling approach is used to examine the immediate responses, longer-term behavior, and subsequent (partial) recovery of a Pacific atoll fresh water lens after saline damage caused by cyclone-generated wave washover under different scenarios. Important findings include: (1) the saline plume formed by a washover event mostly migrates downward first through the top coral sand and gravel substrate, but then exits the aquifer to the ocean laterally through the more permeable basement limestone (2) a lower water table position before the washover event, rather than a longer duration of storm washover, causes more severe damage to the fresh water lens (3) relatively fresher water can possibly be found as a preserved horizon in the deeper part of an aquifer after disturbance, especially if the fresh water lens extends into the limestone under normal conditions (4) post-cyclone accumulation of sea water in the central depression (sw ) of an atoll islet prolongs the later stage of fresh water lens recovery.
Publisher: Wiley
Date: 09-05-2015
DOI: 10.1002/JOC.4027
Publisher: Wiley
Date: 18-05-2018
DOI: 10.1002/WEA.3242
Publisher: Elsevier BV
Date: 06-2011
Publisher: Elsevier BV
Date: 02-2018
Publisher: American Association for the Advancement of Science (AAAS)
Date: 23-04-2010
Publisher: Elsevier BV
Date: 12-2013
Publisher: CSIRO Publishing
Date: 1998
DOI: 10.1071/S97078
Abstract: Rainsplash is a term that has been used to describe a wide variety of effects caused by the impact of raindrops on soils. This is because rainsplash, even by in idual drops, is not a single process but a combination of several discrete but interacting soil particle detachment and transport mechanisms. Because there are a number of possible rainsplash sub-processes that may operate on soils, some of the terminology used in splash studies is inconsistent. In response, this paper reviews some of the past research on raindrop{soil interactions, as well as incorporating observations by the author, in order to clarify the definitions used to describe soil dispersal mechanisms during drop impact. Five main mechanisms are identified, and defined as (1) aggregate breakdown, (2) cratering, (3) splashing, (4) splash saltation, and (5) splash creep, several of which are illustrated with photographic and video techniques under laboratory splash tests. For rainfall in field conditions, an integrated ‘component approach’ introduces a more expansive and flexible approach to rainsplash on soils than is currently available, by considering this geomorphological process as a suite of discrete but interacting mechanisms, varying with changing rainfall and soil characteristics during storms. Some implications of this concept for erosion studies in splash-prone areas are examined.
Publisher: Springer Science and Business Media LLC
Date: 13-03-2018
Publisher: Informa UK Limited
Date: 02-2012
Publisher: Wiley
Date: 21-08-2008
Publisher: Wiley
Date: 09-03-2021
DOI: 10.1111/ANAE.15458
Abstract: Peri‐operative SARS‐CoV‐2 infection increases postoperative mortality. The aim of this study was to determine the optimal duration of planned delay before surgery in patients who have had SARS‐CoV‐2 infection. This international, multicentre, prospective cohort study included patients undergoing elective or emergency surgery during October 2020. Surgical patients with pre‐operative SARS‐CoV‐2 infection were compared with those without previous SARS‐CoV‐2 infection. The primary outcome measure was 30‐day postoperative mortality. Logistic regression models were used to calculate adjusted 30‐day mortality rates stratified by time from diagnosis of SARS‐CoV‐2 infection to surgery. Among 140,231 patients (116 countries), 3127 patients (2.2%) had a pre‐operative SARS‐CoV‐2 diagnosis. Adjusted 30‐day mortality in patients without SARS‐CoV‐2 infection was 1.5% (95%CI 1.4–1.5). In patients with a pre‐operative SARS‐CoV‐2 diagnosis, mortality was increased in patients having surgery within 0–2 weeks, 3–4 weeks and 5–6 weeks of the diagnosis (odds ratio (95%CI) 4.1 (3.3–4.8), 3.9 (2.6–5.1) and 3.6 (2.0–5.2), respectively). Surgery performed ≥ 7 weeks after SARS‐CoV‐2 diagnosis was associated with a similar mortality risk to baseline (odds ratio (95%CI) 1.5 (0.9–2.1)). After a ≥ 7 week delay in undertaking surgery following SARS‐CoV‐2 infection, patients with ongoing symptoms had a higher mortality than patients whose symptoms had resolved or who had been asymptomatic (6.0% (95%CI 3.2–8.7) vs. 2.4% (95%CI 1.4–3.4) vs. 1.3% (95%CI 0.6–2.0), respectively). Where possible, surgery should be delayed for at least 7 weeks following SARS‐CoV‐2 infection. Patients with ongoing symptoms ≥ 7 weeks from diagnosis may benefit from further delay.
Publisher: Springer Science and Business Media LLC
Date: 27-11-2009
Publisher: Springer Science and Business Media LLC
Date: 06-05-2011
Publisher: Wiley
Date: 09-1993
Publisher: Copernicus GmbH
Date: 27-03-2022
DOI: 10.5194/EGUSPHERE-EGU22-1600
Abstract: & & Ludao Island in south eastern Taiwan regularly experiences strong Pacific typhoons.& Fieldwork was undertaken to investigate the characteristics of a boulder field comprising massive limestone and volcanic clasts (10& sup& & /sup& & #8211 & sup& & /sup& kg) on the exposed SE coast. & Old large clasts on the Holocene emerged platform provide evidence for multiple high-energy palaeowave events. & Of particular interest were clasts stacked and imbricated together to form distinct boulder trains. & Inferred minimum flow velocities of 4.3& #8211 .8 m/s were needed for their deposition. & What can imbricated boulder trains tell us about the wave processes and geomorphic influences responsible? & One hypothesis here is that localized funnelling of water flow through narrow relict channels is able to concentrate onshore flow energy into powerful jets. & These channels represent inherited (fossil) spur-and-groove morphology, oriented perpendicular to the modern reef edge, now overdeepened by subaerial karstic solution. & Support for this idea is the location and train-of-direction of the main imbricated boulder cluster at the landward head of one such feature. & Geomorphic controls lifying wave-breaking flow velocities across Ludao's coastal platform mean that a palaeotyphoon origin is sufficient to account for large rock clast stacking and imbrication, without recourse to a tsunami hypothesis.& &
Publisher: Geological Society of London
Date: 2012
DOI: 10.1144/SP361.15
Publisher: Geological Society of London
Date: 2012
DOI: 10.1144/SP361.17
Publisher: Geological Society of London
Date: 2012
DOI: 10.1144/SP361.16
Publisher: Wiley
Date: 14-01-2016
DOI: 10.1002/ESP.3873
Publisher: Elsevier BV
Date: 2015
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: Australia
No related grants have been discovered for James Terry.