AN ALTERNATIVE METHOD FOR DETERMINING EROSION PARAMETERS RELATED TO NON-LINEAR MODEL; BASED ON SUBMERGED JET EROSION TEST

Abstract

Erosion parameters are important factors in riverbank erosion and retreat analysis. The submerged jet test is a widely used technique for measuring erosion resistance of soil based on impinging jet theory. This study aimed to develop a method for determining erosion parameters related to a non-linear erosion model based on JET data, namely, the Linearization method (LM). To verify the LM, the erosion resistance of the U-Tapao riverbank soil was determined using a JET device. Test results show that the exponential rise equation fit well with the scour depth JET data (R2 = 0.931-0.999), and the critical shear stress of bank soils was in the range 1.306-24.33 Pa. The LM can be successfully applied to JET data, with R2 in range 0.800-0. 985. The erodibility coefficients from LM ranged within 0. 02-2.53 cm3/N·s. The LM improved the determination of erosion parameters, being superior to three existing methods ( Blaisdell, Iterative, and Scour depth solution method). The LM proved more reliable than linear models in erosion rate prediction. This model approach also suggests that the JET testing processes should be revised