Study on Parameters of Two Widely Used Cohesive Soils Erosion Models

Abstract

The erosion rate of cohesive soils was typically modeled with the excess shear stress model and the Wilson model. Several kinds of research have been conducted to determine the erodibility parameters of the two models, but few attempts have been made hitherto to investigate the general trends and range of the erodibility parameter values obtained by the commonly used Erosion Function apparatus. This paper collected a database of 177 erosion function apparatus tests to indicate the variability of all erodibility parameters; the range of erodibility parameters is determined by data statistics and parameter theoretical value derivation. The critical shear stress (τc) and erodibility coefficient (Z0) in the over-shear stress model have a positive proportional relationship when the data samples are sufficient. However, there is no such relationship between the erodibility coefficient (b0) and erodibility coefficient (b1) in the Wilson model. It is necessary to express the soil erosion resistance by considering all erosion parameters in the erosion model. Equations relating erodibility parameters to water content, plasticity index, and median particle size were developed by regression analysis.

Erosion processes and sediment source tracing on heterogeneous slopes in the red soil region of southern China

“…Many studies have examined the relationship between the PSD of soil and its erodibility (Guo & Yu, 2017; Nciizah & Wakindiki, 2015; Wang, Zhou, et al, 2021). Based on the total sediment yield of the homogeneous slopes (Table 2), the order of soil erodibility was S LBC > S MDL > S MTL .…”

Studying The Effects of Forest Fire on Consistency Limits of Sandy Soils: A Case Study, Kozağaç, Muğla

“…For these reasons, these studies have addressed the aggregate stability, water repellency, and chemical properties of soil after forest fires, which also promote erodibility of the topsoil layer. The relationship between erodibility and the plasticity of soil has been revealed in literature (Khoirullah et al, 2019;Lalitha et al, 2021;Wang et al, 2021). These studies have mainly focused on cohesive soils and their physical and chemical properties after a forest fire or laboratory heat treatment.…”