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Assiut University (2020)

HYDROLOGICAL PARAMETERS AFFECTING FLASH FLOODS : CASE STUDY WADI AL-BAROUD EL-ABIAD, SAFAGA CITY, RED SEA GOVERNORATE

Esraa Mohamed Abdel Goad؛ Taha

Titre : HYDROLOGICAL PARAMETERS AFFECTING FLASH FLOODS : CASE STUDY WADI AL-BAROUD EL-ABIAD, SAFAGA CITY, RED SEA GOVERNORATE

Auteur : Esraa Mohamed Abdel Goad؛ Taha

Etablissement de soutenance : Assiut University

Grade : Master of Science (MS) 2020

Résumé partiel
Flash flood is one of the most important natural hazards all over the world. It is very dangerous due to its effect on the life of people and may lead to death. So, hydrologists are aware of flash flood by predicting and studying the factors affecting its occurrence. In this Thesis, hydrological parameters affecting flash floods in arid or semi-arid areas are studied. The study area is Wadi Al-baroud El-abiad which is located to the north west of Safaga city on the red sea coast that is frequently subjected to severe flash flood. Wadi Al-baroud El-abiad dam (1) was constructed at the outlet of the basin to protect Safaga city from flash flood disasters. Three types of parameters affecting floods are considered i.e. meteorological (climatic), morphological, and geological factors. Rainfall data from rain gauge station near the area are used. Climatic data are analyzed by using Hyfran-plus program to reach the design storm values for different return periods for 5, 10, 25, 50, 100 and 200 years. The mean monthly rainfall values of Safaga meteorological station from 1994 to 2018 is used and the annual maximum values of rainfall rates are extracted from it. Digital elevation model (DEM) and digital terrain data of the catchment are obtained from the USGS EathExplorer website and inserted into WMS and AcrGIS software. Morphological characteristics of the basin could be calculated as area of the basin (A), its length (L), and circumference (C) by addition to other morphologicalbasin characteristics as Circularity ratio (Rc),Elongated Ratio (Re), Form Factor (R.f), Compaction coefficient (Cc) andLemniscate Factor (K).El-Shamy’s approach is used to evaluate the hazard degree for Wadi Al-baroud El-abiad basin using three morphometric parameters (drainage frequency, drainage density and bifurcation ratio). Hydrological characteristics such as unit hydrograph, concentration time, storage coefficient, and delay time are estimated using soil type and land use in the study area. SCS and Curve Number methods are used for estimating soil type and land use of thebasin. Many software and tools are used in data analysis and watershed delineation among of them, GIS, WMS, SURFER, HYFRAN andGoogle Earth. As a result, flood hydrograph curves are estimated.

Présentation étendue (EULC)

Page publiée le 23 avril 2022