Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Environmental Hydrogeological Study Using Remote Sensing and GIS at Helwan District, Egypt

Auteur : El-Gaby, Safinaz Ali Abd-Rabou Mahmoud .

Etablissement de soutenance : Helwan University

Grade : Doctor of Philosophy (PhD) in Geology 2021

Résumé
The current thesis aims to apply the Remote Sensing data and GIS techniques for study the geomorphological, hydrogeological and the environmental settings upon Helwan-Atfih area. To achieve this aim, Multiple satellite data, topographical, hydrogeological and field data were used. The study area is a part of the Eastern Desert dry lands of Egypt and is characterized by agricultural activity, industrial activity, surface water system and groundwater aquifers and multiple drainage basins that are draining toward the River Nile. Lithostratigraphically, the area comprises of a sedimentary succession belonging to Tertiary to Quaternary age that are affected by faulting and joints, where the NW-SE and E-W are the dominant directional trends of faults and of the extracted lineaments. The morphometric analysis is achieved to ten watershed basins and 27 morphometric parameters are estimated and their results indicate that they have moderate to high flood hazard. The estimated surface runoff volume (Qv) ranges between 2.42×106 m3 and 12.08×106 m3 for a single event of 41.9 mm. The Groundwater is available through the Quaternary and the Pliocene aquifers with a general groundwater flow towards the River Nile at the west. The groundwater geochemistry reveals that the groundwater is affected by anthropogenic activities. The evaluation of groundwater quality shows that the groundwater of the aquifers in the study area are unsuitable for domestic, laundry and drinking purposes, whereas it is suitable for irrigation with different levels. The flood risk assessment using Arc-GIS Weighted Overlay method show that wadi Al-Reshrash is the most prone basin to flooding. The waterlogging problem is affected generally by five factors, which areII weighted with each other using Arc-GIS Weighted Overlay to assess this problem within the study area. Key Words : Remote Sensing, GIS, Helwan area, Al-Saff area, Atfih area, Morphometric analysis, Surface runoff, Flash flood, Waterlogging, Hydrogeology, Groundwater

Présentation étendue (EULC)