ORCID Profile
0000-0001-5977-1772
Current Organisation
University of Southern Queensland - Springfield Campus
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Publisher: IWA Publishing
Date: 05-11-2019
DOI: 10.2166/WS.2019.160
Abstract: Due to unavailability of sufficient discharge data for many rivers, an appropriate approach is required to provide accurate data for estimating discharge in ungauged watersheds. In this study, Global Land Data Assimilation System (GLDAS) datasets were integrated with Hydrologic Engineering Center Hydrologic Modeling System (HEC-HMS) to simulate the outlet river discharge in Polroud watershed, located in the North of Iran. Temperature and precipitation products generated by GLDAS were calibrated using regression analysis based on observation data for the period of 2004–2006. Then, river discharge was simulated by using HEC-HMS based on two different datasets (GLDAS meteorological product and gauged data) on the scale of the basin for the same period. The results clearly indicated that the forcing of GLDAS data into HEC-HMS model leads to promising results with acceptable correlation with observed data. Although, in comparison with direct GLDAS runoff products, the proposed approach improved the accuracy of river discharge, the problem of underestimation still reduces the expected accuracy. Because of global accessibility, GLDAS datasets would be a good alternative in ungauged or poorly gauged watersheds.
Publisher: Research Square Platform LLC
Date: 06-09-2022
DOI: 10.21203/RS.3.RS-1947371/V1
Abstract: The frequency and severity of extreme temperatures are changing and therefore, the necessity for the development of design temperatures has emerged. Design temperatures in the form of temperature-duration-frequency (TDF) curves can be utilized to better understand the variability of extreme temperatures with respect to duration and recurrence levels. This study explored the presence/absence of trend and step change in extreme temperatures for nine locations across Australia. Frequency analysis of annual maximum temperatures from 1- to 15-day durations was performed using a generalized extreme value (GEV) distribution under stationary and non-stationary conditions, where the parameters were estimated using the Monte Carlo Bayesian inference approach. Rising trend and step change were observed in Hobart, Adelaide, Perth, Darwin, Alice Springs, Sydney and Melbourne, but not identified in Cairns and Brisbane. Lower variability in design temperatures was found in Cairns and Brisbane, as well as in Darwin and Alice Springs. In contrast, high variability was observed in Sydney and Melbourne, and high design temperatures are reflected in Adelaide and Perth. The approach followed in this study can be applied to any location for TDF curves development and can be utilised to support health risk management of heatwaves, design of infrastructures where temperature related changes may impact the infrastructure, and for preparedness for natural hazards like droughts and bushfires.
Publisher: MDPI AG
Date: 25-10-2022
DOI: 10.3390/IJGI11110535
Abstract: Understanding the effects of global change and human activities on water supplies depends greatly on surface water dynamics. A comprehensive examination of the hydroclimatic variations at the transboundary level is essential for the development of any adaptation or mitigation plans to deal with the negative effects of climate change. This research paper examines the hydroclimatic factors that contribute to the desiccation of the Doosti Dam’s basin in the transboundary area using multisensor satellite data from the Google Earth Engine (GEE) platform. The Mann–Kendall and Sens slope estimator test was applied to the satellite datasets to analyse the spatial and temporal variation of the hydroclimate variables and their trend over the transboundary area for 18 years from 2004 to 2021 (as the dam began operating in 2005). Statistical analysis results showed decreasing trends in temperature and an increase in rainfall with respect to station-observed available data. Evapotranspiration and irrigated area development followed the increasing pattern and a slight decrease in snow cover. The results confirmed a large expansion of the irrigated area, especially during the winter growing season. The increase in irrigated cultivated areas during both winter and summer seasons is possibly the main reason for the ersion of water to meet the irrigation requirements of the developed agriculture areas. The approach followed in this study could be applied to any location around the globe to evaluate the hydrological conditions and spatiotemporal changes in response to climate change, trend analysis and human activities.
Location: Australia
No related grants have been discovered for Hadis Pakdel.