Soil erosion estimation in Wadi Thilan basin, south of Riyadh In the Kingdom of Saudi Arabia: A study in environmental geomorphology

Document Type : Original Article

Authors

Alarabi Bin Muhaidi ِAlgeria

Abstract

In the absence of actual measurements of the soil erosion processes, this study deals with the estimation of erosion by applying the Gavrilović 'EPM' model, based on the average yearly of rainfall, the temperature coefficient, and the values ​​of the reference tables for the soil cover coefficient (Xai), the soil resistance coefficient (Yi) and the and the coefficient of the extent (Ø). The mean slope of the watershed (Ii) , and the perimeter of the basin (O), difference between the mean and the outlet elevations (D) and the basin length (L) can be computed by the outputs the DEM digital elevation model analysis.
The Shapiro-Wilk statistical test showed the normality of the annual erosion total (Wg), the actual sediment yield (solid transport, Gg) and the average annual specific production of sediments (Wsp < /sub>) in the total drainage area of wadi Wuthaylan equivalent to 663 km2. Also, this statistical test revealed the distribution conformity of the soil erosion and the rainfall distribution.
The results of the statistical tests of Levene test, Hartley's Fmax-ratio t-student of the variances of rainfall, soil erosion and their increasing trends are not significant during the two periods (1975-1996) and (1997-2018).

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