Simulation of flood hazard in the semi-urban and urban using GIS and HEC-RAS of Wadi Zaarour (Tebessa, Algeria)

Description

This books aims the use of Geographic Information System (GIS) and remote-sensing techniques in studying the flood riskand the Normalized Difference Vegetation Index (NDVI) of the watersheds to identify the factors that increase flood hazards in Wadi Zaarour. On the first step, it begins and analyzes maximum daily rainfall values to determine the maximum flood flow and volume during different return periods of 10, 50, 100, and 200 years, in order to map the floodplain of the river. This is accomplished using Geographic Information Systems (GIS) and HEC-RAS software for flood simulation. The results of the maps and values for the Normalized Difference Vegetation Index (NDVI) were also obtained. It shows that due to natural and human factors, the vegetation cover in the watersheds has gradually shirked over the different periods the study tackles. The results of the flood simulation in Wadi Zaarour show that river waters inundate the southern areas of informal expansion, the Ezawya, the railway, Bab zwatine east side of city center – which is an economic artery for the city. The peak flow reaches 40.70 m³/h, and the volume of flow is 61.05 m³/s, in a during a 200-year return period.