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Mohamed Saber
Water Resources Research Center, DPRI, Kyoto University, Goka-sho, Uji City, Kyoto, 611-0011, Japan

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Journal article
Published: 16 June 2021 in Remote Sensing Applications: Society and Environment
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The lack of monitoring and observational data is hampering the assessment of flash flood hazard in arid environments. This study forecasts and investigates flash floods hazards in Wadi Nisah basin in the central region of Saudi Arabia. An integrated approach of Geographic Information System (GIS), Remote Sensing (RS), and Watershed Modeling System (WMS) is presented to determine the flash flood hazards based on morphometric analysis along with rainfall runoff modeling. RS datasets including Shuttle Radar Topography Mission (SRTM) data for digital elevation model (DEM), and SPOT-5 satellite images for land cover mapping, in addition to meteorological data (represented in historical rainfall logs) are used. The study area is divided into 14 sub-basins according to the 5th stream order. The morphometric parameter's analysis clearly show that 42.3%–62% of the total region of Wadi Nisah is highly prone to flooding. Furthermore, medium- and low-hazard areas make up 2.1%–36.4% and 16.5%–55.6% of the total area, respectively. Rainfall-runoff modeling shows that the peak discharge values of sub-basin 14, covers 39.6% of the Wadi Nisah total area, making it greater than that of other sub-basins for each return period, ranging from 12.3 m3/s for a 5-year return period to 294.5 m3/s for a 100-year return period. Accordingly, sub-basin 14 poses more flood risk than other Wadi Nisah sub-basins, as confirmed by the morphometric ranking method analysis.

ACS Style

Mahmoud M. Abdelkader; Ahmed I. Al-Amoud; Mohamed El Alfy; Ahmed El-Feky; Mohamed Saber. Assessment of flash flood hazard based on morphometric aspects and rainfall-runoff modeling in Wadi Nisah, Central Saudi Arabia. Remote Sensing Applications: Society and Environment 2021, 23, 100562 .

AMA Style

Mahmoud M. Abdelkader, Ahmed I. Al-Amoud, Mohamed El Alfy, Ahmed El-Feky, Mohamed Saber. Assessment of flash flood hazard based on morphometric aspects and rainfall-runoff modeling in Wadi Nisah, Central Saudi Arabia. Remote Sensing Applications: Society and Environment. 2021; 23 ():100562.

Chicago/Turabian Style

Mahmoud M. Abdelkader; Ahmed I. Al-Amoud; Mohamed El Alfy; Ahmed El-Feky; Mohamed Saber. 2021. "Assessment of flash flood hazard based on morphometric aspects and rainfall-runoff modeling in Wadi Nisah, Central Saudi Arabia." Remote Sensing Applications: Society and Environment 23, no. : 100562.

Journal article
Published: 01 February 2021 in Journal of Hydrologic Engineering
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Wadis, an Arabic term referring to a wadi, in the Eastern Desert of Egypt have undergone rapid unsustainable development in areas vulnerable to flash flooding and water scarcity. To reduce the risk of damage and loss of life from flash floods to a wadi’s new residents, the priority is to develop mitigation strategies with distributed (watershed scale) or concentrated (localized) mitigation structures to promote sustainable development. The focus of this study is to develop a new approach that will help in assessing various flood mitigation scenarios in Wadi Abadi in the Eastern Desert of Egypt. The proposed approach considers the limited data availability in the wadi system and utilizes spatial analysis and an in-house developed distributed hydrological model, Hydrological River Basin Environmental Assessment Model (Hydro-BEAM), upgraded with a reservoir routing module. Sensitivity analysis of the key Hydro-BEAM model parameters indicated that the most significant parameters controlling the wadi flood peaks are soil thickness and porosity, runoff coefficient, subsurface layer outlet coefficient, and channel roughness. Digital Elevation Model (DEM) data and satellite imagery were utilized to propose the locations and derive design characteristics of the mitigation structures. The mitigation strategies evaluated in this study resulted in a peak flood reduction percentage of 90% and 86% for the distributed and concentrated dam scenarios, respectively. The results show that a group of distributed dams could outperform a single concentrated dam when flood mitigation and water resources management aspects are considered in the wadi region, where the distributed dams scenario has 600% more protected area and 21% more reservoir volume than the concentrated scenario (i.e., use of one dam). However, the concentrated dam scenario may have advantages due to the cost of construction and operations. The proposed approach can assess the flood risk reduction due to different mitigation measures and provide strategies for development and planning in wadi regions.

ACS Style

Mohammed Abdel-Fattah; Sameh A. Kantoush; Mohamed Saber; Tetsuya Sumi. Evaluation of Structural Measures for Flash Flood Mitigation in Wadi Abadi Region of Egypt. Journal of Hydrologic Engineering 2021, 26, 04020062 .

AMA Style

Mohammed Abdel-Fattah, Sameh A. Kantoush, Mohamed Saber, Tetsuya Sumi. Evaluation of Structural Measures for Flash Flood Mitigation in Wadi Abadi Region of Egypt. Journal of Hydrologic Engineering. 2021; 26 (2):04020062.

Chicago/Turabian Style

Mohammed Abdel-Fattah; Sameh A. Kantoush; Mohamed Saber; Tetsuya Sumi. 2021. "Evaluation of Structural Measures for Flash Flood Mitigation in Wadi Abadi Region of Egypt." Journal of Hydrologic Engineering 26, no. 2: 04020062.

Journal article
Published: 29 October 2020 in Remote Sensing
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Flood risk mapping forms the basis for disaster risk management and the associated decision-making systems. The effectiveness of this process is highly dependent on the quality of the input data of both hazard and vulnerability maps and the method utilized. On the one hand, for higher-quality hazard maps, the use of 2D models is generally suggested. However, in ungauged regions, such usage becomes a difficult task, especially at the microscale. On the other hand, vulnerability mapping at the microscale suffers limitations as a result of the failure to consider vulnerability components, the low spatial resolution of the input data, and the omission of urban planning aspects that have crucial impacts on the resulting quality. This paper aims to enhance the quality of both hazard and vulnerability maps at the urban microscale in ungauged regions. The proposed methodology integrates remote sensing data and high-quality city strategic plans (CSPs) using geographic information systems (GISs), a 2D rainfall-runoff-inundation (RRI) simulation model, and multicriteria decision-making analysis (MCDA, i.e., the analytic hierarchy process (AHP)). This method was implemented in Hurghada, Egypt, which from 1996 to 2019 was prone to several urban flood events. Current and future physical, social, and economic vulnerability maps were produced based on seven indicators (land use, building height, building conditions, building materials, total population, population density, and land value). The total vulnerability maps were combined with the hazard maps based on the Kron equation for three different return periods (REPs) 50, 10, and 5 years to create the corresponding flood risk maps. In general, this integrated methodology proved to be an economical tool to overcome the scarcity of data, to fill the gap between urban planning and flood risk management (FRM), and to produce comprehensive and high-quality flood risk maps that aid decision-making systems.

ACS Style

Karim Abdrabo; Sameh Kantoush; Mohamed Saber; Tetsuya Sumi; Omar Habiba; Dina Elleithy; Bahaa Elboshy. Integrated Methodology for Urban Flood Risk Mapping at the Microscale in Ungauged Regions: A Case Study of Hurghada, Egypt. Remote Sensing 2020, 12, 3548 .

AMA Style

Karim Abdrabo, Sameh Kantoush, Mohamed Saber, Tetsuya Sumi, Omar Habiba, Dina Elleithy, Bahaa Elboshy. Integrated Methodology for Urban Flood Risk Mapping at the Microscale in Ungauged Regions: A Case Study of Hurghada, Egypt. Remote Sensing. 2020; 12 (21):3548.

Chicago/Turabian Style

Karim Abdrabo; Sameh Kantoush; Mohamed Saber; Tetsuya Sumi; Omar Habiba; Dina Elleithy; Bahaa Elboshy. 2020. "Integrated Methodology for Urban Flood Risk Mapping at the Microscale in Ungauged Regions: A Case Study of Hurghada, Egypt." Remote Sensing 12, no. 21: 3548.

Journal article
Published: 17 October 2020 in Journal of Hydrology: Regional Studies
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The Mekong basin, where climate change and anthropogenic interventions (e.g., dams, sand mining, and sluice gates) have intensified in the recent decades affecting the pristine flow regime and salinity intrusion. This paper aims at quantifying the flow regime alterations in the entire Mekong from 1980 to 2015 and linking with the controlling drivers of alterations. In this regard, various indicators, analytical methods, and a semi two-dimensional hydrodynamic and advection-dispersion model were used. The flow regime alterations in the high-dam development period (2009–2015) are more pronounced than in the low-dam development period (1993–2008), compared to the no-dam development period (1980–1992), based on most of the indicators analyzed. In the high-dam development period all existing dams with large reservoir capacity seemed to have cumulatively reduced the flood pulses and frequency and increased the low-flow discharge along the entire Mekong through reservoir operations, exceeding climate change effect. In the recent years the water levels in the low-flow season in the Vietnamese Mekong Delta (VMD) have decreased, possibly because of increased riverbed incision caused by reduced sediment supply and increased sand mining. The reduced water levels together with the increased number of the sluice gates constructed seemed to have increased salinity intrusion in the VMD which may be partly reduced by early emergency water release from upstream dams.

ACS Style

Doan Van Binh; Sameh A. Kantoush; Mohamed Saber; Nguyen Phuong Mai; Shreedhar Maskey; Dang Tuan Phong; Tetsuya Sumi. Long-term alterations of flow regimes of the Mekong River and adaptation strategies for the Vietnamese Mekong Delta. Journal of Hydrology: Regional Studies 2020, 32, 100742 .

AMA Style

Doan Van Binh, Sameh A. Kantoush, Mohamed Saber, Nguyen Phuong Mai, Shreedhar Maskey, Dang Tuan Phong, Tetsuya Sumi. Long-term alterations of flow regimes of the Mekong River and adaptation strategies for the Vietnamese Mekong Delta. Journal of Hydrology: Regional Studies. 2020; 32 ():100742.

Chicago/Turabian Style

Doan Van Binh; Sameh A. Kantoush; Mohamed Saber; Nguyen Phuong Mai; Shreedhar Maskey; Dang Tuan Phong; Tetsuya Sumi. 2020. "Long-term alterations of flow regimes of the Mekong River and adaptation strategies for the Vietnamese Mekong Delta." Journal of Hydrology: Regional Studies 32, no. : 100742.

Research articles
Published: 02 February 2020 in Urban Water Journal
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The Arab region is characterized by water scarcity, extreme droughts and floods. This paper aims to utilize the global datasets of rainfall, evapotranspiration (ET), Normalized Difference Vegetation Index (NDVI), Gravity Recovery and Climate Experiment (GRACE) satellites and Data Assimilation of GLDAS to assess the spatiotemporal variability of water resource components over the Arab region. The results indicate that the Terrestrial water storage (TWS) are declining in most of the countries over the analysis period (2002–2015). The long-term analysis indicates that 2008 was the driest year and a distinctive deflection point for a declining trend of TWS. Non-parametric trend analysis test of Man-Kendall showed that trend of rainfall, NDVI, ET are not statistically significant except in some regions. The highest TWS volume of about +1586.9 Million Cubic Meter was found in Sudan, evidenced by rainfall. The study provides a guide for stakeholders to manage water resources in all countries separately.

ACS Style

Mohamed Saber; Sameh Ahmed Kantoush; Tetsuya Sumi. Assessment of spatiotemporal variability of water storage in Arabian countries using global datasets: implications for water resources management. Urban Water Journal 2020, 17, 416 -430.

AMA Style

Mohamed Saber, Sameh Ahmed Kantoush, Tetsuya Sumi. Assessment of spatiotemporal variability of water storage in Arabian countries using global datasets: implications for water resources management. Urban Water Journal. 2020; 17 (5):416-430.

Chicago/Turabian Style

Mohamed Saber; Sameh Ahmed Kantoush; Tetsuya Sumi. 2020. "Assessment of spatiotemporal variability of water storage in Arabian countries using global datasets: implications for water resources management." Urban Water Journal 17, no. 5: 416-430.

Journal article
Published: 10 January 2020 in Geosciences
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Urban growth, extreme climate, and mismanagement are crucial controlling factors that affect flood vulnerability at wadi catchments. Therefore, this study attempts to understand the impacts of these three factors on the flash flood vulnerability in different climatic regions in Egypt. An integrated approach is presented to evaluate the urban growth from 1984 to 2019 by using Google Images and SENTINEL-2 data, and to develop hazard maps by using a rainfall-runoff-inundation model (RRI). Annual rainfall trend analysis was performed to evaluate the temporal variability trend. The hazard maps that were created were classified into three categories (low, medium, and high) and integrated with the urban growth maps to evaluate the impacts on the flood-vulnerable areas. The results show a significant increase in urban growth resulting in an increase of prone areas for flood hazards over time. However, the degree of this hazard is mainly related to growth directions. Mismanagement affects urban growth directions in both planned and unplanned growth, whether by loss of control over unplanned growth or by deficiencies in approved plans. The rainfall analysis showed that there is no explicit relationship to increases or decreases in the flood vulnerable areas. An urban planning approach is recommended for risk reduction management based on a comprehensive study considering such factors.

ACS Style

Mohamed Saber; Karim I. Abdrabo; Omar M. Habiba; Sameh A. Kantosh; Tetsuya Sumi. Impacts of Triple Factors on Flash Flood Vulnerability in Egypt: Urban Growth, Extreme Climate, and Mismanagement. Geosciences 2020, 10, 24 .

AMA Style

Mohamed Saber, Karim I. Abdrabo, Omar M. Habiba, Sameh A. Kantosh, Tetsuya Sumi. Impacts of Triple Factors on Flash Flood Vulnerability in Egypt: Urban Growth, Extreme Climate, and Mismanagement. Geosciences. 2020; 10 (1):24.

Chicago/Turabian Style

Mohamed Saber; Karim I. Abdrabo; Omar M. Habiba; Sameh A. Kantosh; Tetsuya Sumi. 2020. "Impacts of Triple Factors on Flash Flood Vulnerability in Egypt: Urban Growth, Extreme Climate, and Mismanagement." Geosciences 10, no. 1: 24.

Journal article
Published: 11 October 2019 in Scientific African
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The study aims to use PHREEQC model to characterize hydrogeochemical characteristics of groundwater aquifer based on the physico-chemical properties and to understand rock-water interactions. Fifteen samples have been hydrochemically analyzed form groundwater wells located in Sohag City, Egypt. Hydrochemical characteristics were spatially depicted to understand the spatial variations such as (pH, EC, TDS, Na+, K+, Ca2+ and Mg2+, SO42−, CO32−, HCO3−, and Cl−). Groundwater quality evaluation is conducted to know the suitability for uses in various purposes. The concentration values of TDS, EC, HCO3− and Na+ are recorded above the permissible limit revealing a deterioration of water quality. The positive correlation between HCO3− and Ca2+ (r=0.62), Mg2+ and HCO3− (r=0.63), Ca2+ and Mg2+ (r=0.66), and K+ and HCO3− (r=0.66) reflects the precipitation processes, while the correlation is high between Cl− and Na+ (r=0.89) is indicating of dissolution of halite minerals. These are also supported by the results obtained from PHREEQC Model.

ACS Style

Mahmoud Abdelshafy; Mohamed Saber; Amal Abdelhaleem; Shrouk Mohammed Abdelrazek; Elmontser M. Seleem. Hydrogeochemical processes and evaluation of groundwater aquifer at Sohag city, Egypt. Scientific African 2019, 6, e00196 .

AMA Style

Mahmoud Abdelshafy, Mohamed Saber, Amal Abdelhaleem, Shrouk Mohammed Abdelrazek, Elmontser M. Seleem. Hydrogeochemical processes and evaluation of groundwater aquifer at Sohag city, Egypt. Scientific African. 2019; 6 ():e00196.

Chicago/Turabian Style

Mahmoud Abdelshafy; Mohamed Saber; Amal Abdelhaleem; Shrouk Mohammed Abdelrazek; Elmontser M. Seleem. 2019. "Hydrogeochemical processes and evaluation of groundwater aquifer at Sohag city, Egypt." Scientific African 6, no. : e00196.

Journal article
Published: 20 March 2019 in Hydrology
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Flash floods in wadi systems discharge large volumes of water to either the sea or the desert areas after high-intensity rainfall events. Recently, wadi flash floods have frequently occurred in arid regions and caused damage to roads, houses, and properties. Therefore, monitoring and quantifying these events by accurately measuring wadi discharge has become important for the installation of mitigation structures and early warning systems. In this study, image-based methods were used to measure surface flow velocities during a wadi flash flood in 2018 to test the usefulness of large-scale particle image velocimetry (LSPIV) and space–time image velocimetry (STIV) techniques for the estimation of wadi discharge. The results, which indicated the positive performance of the image-based methods, strengthened our hypothesis that the application of LSPIV and STIV techniques is appropriate for the analysis of wadi flash flood velocities. STIV is suitable for unidirectional flow velocity and LSPIV is reliable and stable for two-dimensional measurement along the wadi channel, the direction of flow pattern which varies with time.

ACS Style

Mahmood Al-Mamari; Sameh Kantoush; Sohei Kobayashi; Tetsuya Sumi; Mohamed Saber. Real-Time Measurement of Flash-Flood in a Wadi Area by LSPIV and STIV. Hydrology 2019, 6, 27 .

AMA Style

Mahmood Al-Mamari, Sameh Kantoush, Sohei Kobayashi, Tetsuya Sumi, Mohamed Saber. Real-Time Measurement of Flash-Flood in a Wadi Area by LSPIV and STIV. Hydrology. 2019; 6 (1):27.

Chicago/Turabian Style

Mahmood Al-Mamari; Sameh Kantoush; Sohei Kobayashi; Tetsuya Sumi; Mohamed Saber. 2019. "Real-Time Measurement of Flash-Flood in a Wadi Area by LSPIV and STIV." Hydrology 6, no. 1: 27.

Journal article
Published: 18 May 2018 in Water
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This study investigates the utility of satellite-based rainfall estimates in simulating flash floods in Karpuz River Basin, Turkey, characterized by limited rain gauge network. Global Satellite Mapping of Precipitation (GSMaP) product was evaluated with the rain gauge network at daily and monthly time-scales considering seasonality, elevation zones, extreme events and rainfall intensity thresholds. Statistical analysis indicated that GSMaP shows acceptable linear correlation coefficient with rain gauges, however, suffers from significant underestimation bias. Statistical measures exhibited a remarkable deterioration with increasing elevation-following a linear relationship; for example, percent bias was found to increase by a rate of 11.7% with every 400 m interval. A multiplicative bias correction scheme was devised, and Hydrological River Basin Environmental Assessment Model (Hydro-BEAM) was implemented to simulate flash floods driven by the uncorrected/corrected GSMaP data. Analysis of intensity thresholds revealed that appropriate threshold selection is critically important for the bias correction procedure. The hydrological model was calibrated for flash flood events during October–December 2007 and 2012 and validated during October–December, 2009 and 2010. Flash floods simulations were improved by the local bias correction procedure applied to the GSMaP data, but the degree of improvement varied from one period to another. The results of the study indicate that bias factors incorporating multiple variables such as extreme events and elevation variability have the potential to further improve flood simulations.

ACS Style

Mohamed Saber; Koray K. Yilmaz. Evaluation and Bias Correction of Satellite-Based Rainfall Estimates for Modelling Flash Floods over the Mediterranean region: Application to Karpuz River Basin, Turkey. Water 2018, 10, 657 .

AMA Style

Mohamed Saber, Koray K. Yilmaz. Evaluation and Bias Correction of Satellite-Based Rainfall Estimates for Modelling Flash Floods over the Mediterranean region: Application to Karpuz River Basin, Turkey. Water. 2018; 10 (5):657.

Chicago/Turabian Style

Mohamed Saber; Koray K. Yilmaz. 2018. "Evaluation and Bias Correction of Satellite-Based Rainfall Estimates for Modelling Flash Floods over the Mediterranean region: Application to Karpuz River Basin, Turkey." Water 10, no. 5: 657.

Article
Published: 24 July 2017 in Water
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The generation and processes of wadi flash floods are very complex and are not well understood. In this paper, we investigate the relationship between variations in geomorphometric and rainfall characteristics and the responses of wadi flash floods. An integrated approach was developed based on geomorphometric analysis and hydrological modeling. The Wadi Qena, which is located in the Eastern Desert of Egypt, was selected to validate the developed approach and was divided into 14 sub-basins with areas ranging from 315 to 1488 km2. The distributed Hydrological River Basin Environment Assessment Model (Hydro-BEAM) was used to obtain a good representation of the spatial variability of the rainfall and geomorphology in the basin. Thirty-eight geomorphometric parameters representing the topographic, scale, shape and drainage characteristics of the basins were considered and extracted using geographic information system (GIS) techniques. A series of flash flood events from 1994, 2010, 2013, and 2014, in addition to synthetic virtual storms with different durations and intensities, were selected for the application of this study. The results exhibit strong correlations between scale and topographic parameters and the hydrological indices of the wadi flash floods, while the shape and drainage network metrics have smaller impacts. The total rainfall amount and duration significantly impact the relationship between the hydrologic response of the wadi and its geomorphometry. For most of the parameters, we found that the impact of the wadi geomorphometry on the hydrologic response increases with increasing rainfall intensity.

ACS Style

Mohammed Abdel-Fattah; Mohamed Saber; Tetsuya Sumi; Sameh A. Kantoush; Mohamed F. Khalil; Ahmed M. Sefelnasr. A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods. Water 2017, 9, 553 .

AMA Style

Mohammed Abdel-Fattah, Mohamed Saber, Tetsuya Sumi, Sameh A. Kantoush, Mohamed F. Khalil, Ahmed M. Sefelnasr. A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods. Water. 2017; 9 (7):553.

Chicago/Turabian Style

Mohammed Abdel-Fattah; Mohamed Saber; Tetsuya Sumi; Sameh A. Kantoush; Mohamed F. Khalil; Ahmed M. Sefelnasr. 2017. "A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods." Water 9, no. 7: 553.

Conference paper
Published: 10 May 2017 in Springer Water
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The Najd aquifers in Oman, are located in one of the most arid zones in the world. In such regions, there is a shortage in the water resources where groundwater is a very critical component for human life. The main aim of this contribution is to use the satellite remote sensing data of the Gravity Recovery and Climate Experiment (GRACE) along with the Global Land Data Assimilation System (GLDAS), to estimate the groundwater storage changes at the Najd aquifers. Groundwater storage changes were calculated from both GRACE/GLDAS data and from the groundwater level measurements. It was found that the estimated groundwater storage changes from GRACE and water levels coincide in their trends showing a noticeable depletion within the time period from Oct. 2002 to Sept. 2014. The spatial distribution maps of the groundwater storage changes show slightly changes from Oct. 2003 to Sept. 2010, but a significant decreasing were observed from 2010 to 2014. The groundwater storage over Najd aquifers was decreased by about 0.44 and 0.46 km3/year as calculated from GRACE data and groundwater levels, respectively. We also found that groundwater storage was affected by the strong storm events as observed in 2007 and 2010. This contribution could be helpful for the long term sustainable groundwater management in the study area and other arid regions.

ACS Style

Mohamed Saber; Saif Alhinai; Ahmed Al Barwani; Ahmed Al-Saidi; Sameh A. Kantoush; Emad Habib; David M. Borrok; Osman Abdalla; Anvar Kacimov; Mingjie Chen; Ali Al-Maktoumi; Talal Al-Hosni; Ian Clark. Satellite-Based Estimates of Groundwater Storage Changes at the Najd Aquifers in Oman. Springer Water 2017, 155 -169.

AMA Style

Mohamed Saber, Saif Alhinai, Ahmed Al Barwani, Ahmed Al-Saidi, Sameh A. Kantoush, Emad Habib, David M. Borrok, Osman Abdalla, Anvar Kacimov, Mingjie Chen, Ali Al-Maktoumi, Talal Al-Hosni, Ian Clark. Satellite-Based Estimates of Groundwater Storage Changes at the Najd Aquifers in Oman. Springer Water. 2017; ():155-169.

Chicago/Turabian Style

Mohamed Saber; Saif Alhinai; Ahmed Al Barwani; Ahmed Al-Saidi; Sameh A. Kantoush; Emad Habib; David M. Borrok; Osman Abdalla; Anvar Kacimov; Mingjie Chen; Ali Al-Maktoumi; Talal Al-Hosni; Ian Clark. 2017. "Satellite-Based Estimates of Groundwater Storage Changes at the Najd Aquifers in Oman." Springer Water , no. : 155-169.

Preprint content
Published: 11 November 2016 in Natural Hazards and Earth System Sciences Discussions
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This study investigates the utility of gauge-corrected satellite-based rainfall estimates in simulating flash floods at Karpuz River - a semi-arid basin in Turkey. Global Satellite Mapping of Precipitation (GSMaP) product was evaluated with the rain gauge network at monthly and daily time-scales considering various time periods and rainfall rate thresholds. Statistical analysis indicated that GSMaP shows acceptable linear correlation coefficient with rain gauges however suffers from significant underestimation bias. A rainfall rate threshold of 1 mm/month was the best choice to improve the match between GSMaP and rain gauges implying that appropriate threshold selection is critically important for the bias correction. Multiplicative bias correction was applied to GSMaP data using the bias factors calculated between GSMaP and observed rainfall. Hydrological River Basin Environmental Assessment Model (Hydro-BEAM) was used to simulate flash floods at the hourly time scale driven by the corrected GSMaP rainfall data. The model parameters were calibrated for flash flood events during October-December 2007 and then validated for flash flood events during October-December 2009. The results show that the simulated surface runoff hydrographs reasonably coincide with the observed hydrographs.

ACS Style

Mohamed Saber; Koray Yilmaz. Bias Correction of Satellite-Based Rainfall Estimates for Modeling Flash Floods in Semi-Arid regions: Application to Karpuz River, Turkey. Natural Hazards and Earth System Sciences Discussions 2016, 2016, 1 -35.

AMA Style

Mohamed Saber, Koray Yilmaz. Bias Correction of Satellite-Based Rainfall Estimates for Modeling Flash Floods in Semi-Arid regions: Application to Karpuz River, Turkey. Natural Hazards and Earth System Sciences Discussions. 2016; 2016 ():1-35.

Chicago/Turabian Style

Mohamed Saber; Koray Yilmaz. 2016. "Bias Correction of Satellite-Based Rainfall Estimates for Modeling Flash Floods in Semi-Arid regions: Application to Karpuz River, Turkey." Natural Hazards and Earth System Sciences Discussions 2016, no. : 1-35.