Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts
Digital elevation models (DEMs) are the cornerstone for hydrological and geomorphological modeling. Herein, two Nile-tributary catchments (Wadi Al Rishrash and Wadi Atfeh) in Egypt are selected to examine the contribution of different DEMs to the accuracy of hydrological and geomorphological analyse...
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doaj-a4e5e3cc8c154d798b093395affc41bc2021-07-23T13:44:54ZengMDPI AGISPRS International Journal of Geo-Information2220-99642021-06-011043143110.3390/ijgi10070431Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid DesertsMohammed El Bastawesy0Omnia El Saadawy1Abotalib Z. Abotalib2Abdullah Othman3Maysa Taha4Ahmed Gaber5Division of Geological Applications and Mineral Resources, National Authority of Remote Sensing and Space Sciences, Cairo 11765, EgyptDivision of Geological Applications and Mineral Resources, National Authority of Remote Sensing and Space Sciences, Cairo 11765, EgyptDivision of Geological Applications and Mineral Resources, National Authority of Remote Sensing and Space Sciences, Cairo 11765, EgyptDepartment of Environmental Engineering, Umm Al-Qura University, Makkah 21955, Saudi ArabiaDepartment of Geology, Helwan University, Cairo 11795, EgyptDepartment of Geology, Port Said University, Port Said 42511, EgyptDigital elevation models (DEMs) are the cornerstone for hydrological and geomorphological modeling. Herein, two Nile-tributary catchments (Wadi Al Rishrash and Wadi Atfeh) in Egypt are selected to examine the contribution of different DEMs to the accuracy of hydrological and geomorphological analyses in the hyper-arid Sahara. DEMs sources include: Advanced Land Observing Satellite-1 (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) (12.5 m resolution), ALOS World 3D with 30 m resolution (AW3D30), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER DEM with 30 m resolution) and the Shuttle Radar Topography Mission (SRTM with 30 and 90 m resolution), in addition to topographic map-derived DEM (90 m resolution). Using a hypothetical uniformly-distributed 10 mm rainfall event, the estimated parameters, including: flow duration, time to peak and peak discharge rates, are almost similar for the different DEMs and thus technical aspects related to sources and resolutions of the datasets impose insignificant control on quantitative flash-flood analyses. Conversely, variations in geological and geomorphological characteristics of the catchments show more significant control on the hydrograph magnitudes as indicated by the different parameters of the two catchments. These findings indicate that understanding the geological and hydrological evolution of the catchment is essential for integrated management strategies of floods especially in the Saharan–Arabian deserts and in similar conditions of hyper-aridity and scarce in situ data worldwide.https://www.mdpi.com/2220-9964/10/7/431DEMEastern Desert of Egyptdata sourcesflash floodsgeomorphology |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mohammed El Bastawesy Omnia El Saadawy Abotalib Z. Abotalib Abdullah Othman Maysa Taha Ahmed Gaber |
spellingShingle |
Mohammed El Bastawesy Omnia El Saadawy Abotalib Z. Abotalib Abdullah Othman Maysa Taha Ahmed Gaber Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts ISPRS International Journal of Geo-Information DEM Eastern Desert of Egypt data sources flash floods geomorphology |
author_facet |
Mohammed El Bastawesy Omnia El Saadawy Abotalib Z. Abotalib Abdullah Othman Maysa Taha Ahmed Gaber |
author_sort |
Mohammed El Bastawesy |
title |
Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts |
title_short |
Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts |
title_full |
Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts |
title_fullStr |
Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts |
title_full_unstemmed |
Examining the Impact of Different DEM Sources and Geomorphology on Flash Flood Analysis in Hyper-Arid Deserts |
title_sort |
examining the impact of different dem sources and geomorphology on flash flood analysis in hyper-arid deserts |
publisher |
MDPI AG |
series |
ISPRS International Journal of Geo-Information |
issn |
2220-9964 |
publishDate |
2021-06-01 |
description |
Digital elevation models (DEMs) are the cornerstone for hydrological and geomorphological modeling. Herein, two Nile-tributary catchments (Wadi Al Rishrash and Wadi Atfeh) in Egypt are selected to examine the contribution of different DEMs to the accuracy of hydrological and geomorphological analyses in the hyper-arid Sahara. DEMs sources include: Advanced Land Observing Satellite-1 (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) (12.5 m resolution), ALOS World 3D with 30 m resolution (AW3D30), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER DEM with 30 m resolution) and the Shuttle Radar Topography Mission (SRTM with 30 and 90 m resolution), in addition to topographic map-derived DEM (90 m resolution). Using a hypothetical uniformly-distributed 10 mm rainfall event, the estimated parameters, including: flow duration, time to peak and peak discharge rates, are almost similar for the different DEMs and thus technical aspects related to sources and resolutions of the datasets impose insignificant control on quantitative flash-flood analyses. Conversely, variations in geological and geomorphological characteristics of the catchments show more significant control on the hydrograph magnitudes as indicated by the different parameters of the two catchments. These findings indicate that understanding the geological and hydrological evolution of the catchment is essential for integrated management strategies of floods especially in the Saharan–Arabian deserts and in similar conditions of hyper-aridity and scarce in situ data worldwide. |
topic |
DEM Eastern Desert of Egypt data sources flash floods geomorphology |
url |
https://www.mdpi.com/2220-9964/10/7/431 |
work_keys_str_mv |
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