Rational Computational Method of Soil Erodibility andCritical Shear Stress from Experimental Data

doi:10.7523/j.issn.2095-6134.2004.4.007

Abstract

Abstract:

With the analysis of the Water Erosion Prediction Project ( WEEP), simulated rill experiment inlaboratory was conducted to determine the soil erodibility parameter K r and critical shear stressc. The result showsthat soil erodibility parameter K r is the same for a same experimental soil with similar soil physical condit ions underdifferent slope gradients. Soil erodibility parameter K r of used sil-t clay soil ( Loess soil ) is ( 0324-0003) kg??N_-1 ??s_-1 on the average. Critical shear stressc tends to increasewith the slope gradient, for 3198 N??m_-2,3976Nm_-2, 4043 N??m_-2, 4165 N??m_-2,4??870 N??m_-2 under5°,10°??, 15°, 20°, 25°respectively?? The coefficients ofdetermination Rare more than 71% under different hydraulic condit ions. The paper advances a rational method tocalculate quant itatively the soil erodibility parameter K r and critical shear stressc, which is helpful for developingand perfecting the soil erosion prediction model.

Key words: experimental determination, soil erodibility parameter K r, critical shear stressc, soil erosionpredict ion model

CLC Number:

S157

ZHANG Qing-Wen, LEI Ting-Wu, PAN Ying-Hua, GAO Pei-Ling. Rational Computational Method of Soil Erodibility andCritical Shear Stress from Experimental Data[J]. , 2004, 21(4): 468-475.

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