TITLE:
Flash Flood Hazard Mapping Using GIS and Bivariate Statistical Method at Wadi Bada’a, Gulf of Suez, Egypt
AUTHORS:
Sh. A. Abu El-Magd
KEYWORDS:
Flash Flood, Frequency Ratio, Susceptibility Map, Wadi Bada’a
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.7 No.8,
August
29,
2019
ABSTRACT: The area is a part of the Egyptian Eastern Desert in
the northwestward to the Gulf of Suez. It covers an area of about 542 square
kilometers. Wadi Bada’a is devoid of vegetation,
because of the arid climate and water scarcity. However, the present study
concerns the flash flood and its impact on the industrial zone and connected
road at wadi Bada’a. In this work, the bivariate statistical method using
frequency ratio was used to evaluate the areas of potential risk. Geographic
Information System package (GIS) was used to analyze and
calculate different data sets. The different data source has been used in the
research to produce a flood hazard susceptibility map of the area, including
the geologic maps, Landsat-8 imagery, land use, and soil type associated with
field investigation and data collection. Spatial database with elements at
risk, related features and attributes at wadi Bada’a, were constructed.
Training data were created randomly in the study area to create an inventory
map with testing data. The inventory location of 95 location points has been
created. The inventory datasets were divided into 75% of training datasets and
25% testing data. The independent flood-related factors were evaluated by
analyzing each independently and assessing their impact on flooding with inventory datasets. The flood
susceptibility maps were constructed-using training and testing datasets have been used to evaluate using the success rate method. The results of the
accuracy assessment showed a success rate of 76.6% of Area Under Curve.
Therefore, the main road in the study area almost at high risk in many parts
because of flash flood, additionally the industrial activities located in the
moderate risk zone.