الطرق المورفومترية في تقدير مخاطر السيول : حوض وادي الثرثار دراسة حالة

الملخص EN

In this research, the three morphometric methods were adopted (Elshamy Approach, Morphometric Ranking Method and Degree of Flood Hazard) to estimate the risks of flood rains in the Tharthar Wadi basin with its area (VY,.

km²).

The study included (17) morphometric variables that express the geometric, topographic and morphological characteristics and characteristics of the drainage network of the water basin.

The methods were applied to the hydrologically active secondary basins in the main basin (class 4, 5, and 6), which amount to (25) basins.

From the results, it was found that the basins vary in the degree of risk potential and according to the methods used, Where in the Elshamy Approach and according to the relationship between the bifurcation ratios (BR) and the drainage density (Dd) (15 a medium risk basin (C), 9 a low-risk basin (A), basin One high risk (B)), and according to the relationship between bifurcation ratios (BR) and frequency stream (FS) (16 medium risk basins (C), 9 low-risk basins (A)) and in the Morphometric Ranking method (13 basins Low risk, 11medium risk and one basin of high risk), While in the Degree of Flood Hazard (19 basins are very low and very low, 4 medium risks, 2 high and very high basins.