Experimental Study of Rainfall Intensity Effects on the Slope Erosion Rate for Silty Sand Soil with Different Slope Gradient

Full Text PDF PDF
Author(s) Abdul Rivai Suleman | M.S.Pallu | J.Patanduk | T.Harianto
Pages 58-63
Volume 4
Issue 1
Date January, 2014
Keywords Erosion, Silty sand soil type, Rain intensity, Slope gradient, Regression analysis.

Abstract

This study aimed to analyze the effect of rainfall intensity on the slope erosion rate due to the soil density and slope degree that occurs in the silty sand soil type. This research is a physical experimental study using USLE model (Universal Soil Loss Equation) as the benchmark for determining the amount of the soil erosion rate that occurs in the silty sand. The results with 3 variations of rainfall intensity are 50 mm/hour, 100 mm/hour and 200 mm/hour, indicating that the effect of rainfall intensity and slope gradient on soil erosion rates are directly proportional. The higher the rainfall intensity and the greater the value of the slope will increase the rate of soil erosion. The amount of erosion that occurs based on laboratory treatments with successive rainfall intensity I50, I100, and I200 at 5° slope respectively are 48,45 grams, 124,4 grams and 406,7 grams. At the slope of 15°, for the intensity I50, I100, and I200 the amount of erosion respectively are 72,58 grams, 260,0 grams and 1.401 grams. Then for the slope of 25°, due to the increment of the intensity I50, I100, and I200 produced the amount of erosion respectively around 131,3 grams, 856,4 grams and 1.851 grams, and based on the results of the regression analysis for the rate of erosion determination due to the changes in rain intensity are as follow : f (x) = 0,115x1,5346 for 5o slope, f (x) = 0,016x2,1352 for the slope of 15°, and f (x) = 0,0902x1,9089 for the slope of 25°.

< Back to January Issue