Effects of initial soil moisture on rill erodibility and critical shear stress factors in the WEPP model across diverse soil types  

作　　者：Fikret Ari Selen Deviren Saygin Cagla Temiz Sefika Arslan Mehmet Altay Unal Gunay Erpul Dennis C.Flanagan 

机构地区：[1]Department of Electrical and Electronics Engineering,Faculty of Engineering,Ankara University,06830,Golbasi,Ankara,Turkey [2]Department of Soil Science and Plant Nutrition,Faculty of Agriculture,Ankara University,06110,Diskapi,Ankara,Turkey [3]Stem Cell Institute,Ankara University,06520,Cankaya,Ankara,Turkey [4]USDA-Agricultural Research Service,National Soil Erosion Research Laboratory,275 S.Russell St.,West Lafayette,IN,47907-2077,USA

出　　处：《International Soil and Water Conservation Research》2025年第1期1-14,共14页国际水土保持研究(英文)

基　　金：supported by the Scientific and Technological Research Council of Türkiye(TUBITAK)under Grant Number TUBITAK-3001-118O111.

摘　　要：Rill erosion,a significant issue in agricultural regions,is intricately linked to initial soil moisture conditions,affecting the development of concentrated flow erosion processes.However,understanding its dynamics amidst varying soil moisture conditions remain challenging.This study aimed to assess the impact of different soil moisture levels on rill erodibility parameters in the Water Erosion Prediction Project(WEPP)model and to evaluate soil cohesion across a spectrum of soils.Through laboratory experiments employing a small V-shaped rill channel,we investigated rill erodibility(K_(r))and critical hydraulic shear stress(t_(cr)),under three soil moisture scenarios:initially dry,saturated,and drainage,with incremental surface inflow rates.Additionally,we examined the efficiency of soil cohesion obtained from an Automated Soil Cohesion Measurement Apparatus in predicting Kr and tcr across various soil textures.Our analysis encompassed twenty soils representing nine texture classes,revealing significant correlations between basic soil properties,cohesion parameters,and WEPP model rill erodibility.Notably,initial soil moisture conditions exerted substantial influence on erodibility potentials.Soils with higher silt contents demonstrated better fits in terms of Nash-Sutcliffe model efficiency,particularly under initially dry and saturated conditions.However,predictions for initially drained soils yielded poor fits,emphasizing the intricate interplay between soil properties and hydrological conditions.In conclusion,our findings emphasize the critical role of topsoil water dynamics in rill erodibility.We propose that soil cohesion serves as a valuable predictor,complementing friction forces within the soil and enhancing simulations of rill erodibility under shallow flow conditions in rills,particularly in next-generation process-based modeling approaches.

关 键 词：Soil erosion by water Rill erosion Erodibility parameters Soil hydrology Soil cohesion 

分 类 号：S157[农业科学—土壤学]