Calibration,validation,and evaluation of the Water Erosion Prediction Project(WEPP)model for hillslopes with natural runoff plot data  

作　　者：Shuyuan Wang Ryan P.McGehee Tian Guo Dennis C.Flanagan Bernard A.Engel 

机构地区：[1]Department of Agricultural&Biological Engineering,Purdue University,West Lafayette,IN,47907,USA [2]USDA-Agricultural Research Service,National Soil Erosion Research Laboratory,West Lafayette,IN,47907,USA

出　　处：《International Soil and Water Conservation Research》2023年第4期669-687,共19页国际水土保持研究（英文）

摘　　要：The Water Erosion Prediction Project(WEPP)model has been widely used for estimating runoff and soil loss.The evaluation of the latest version(version 2021.133)under a range of environmental conditions can provide confidence to its users.The objectives of this study were to evaluate the WEPP model for runoff and soil loss predictions using 1159 plot years of rainfall-runoff events data from field experi-mental plots with various climates,soils,topographies,and crops.WEPP runoff and soil loss predictions were compared to the observations before and after input parameter calibration.The results showed good predictions of runoff and soil loss were obtained with both the uncalibrated and calibrated WEPP model for all considered scales with Nash-Sutcliffe model efficiencies(NSE)over 0.4.The calibration of input baseline effective hydraulic conductivity(k_(e)),baseline critical shear stress(τ_(c)),baseline rill erod-ibility(k_(r)),and baseline interrill erodibility(k_(i))improved WEPP model performance with NSE values of 0.98 and 0.91 for average annual runoff and soil loss predictions,respectively.The WEPP model tended to underestimate the runoff and soil loss for large events with runoff over 100 mm and soil loss over 120t/ha.Good event runoff and soil loss predictions(NSE ≥0.4)were obtained for the most common cropping/management systems considered,including corn,cotton,tilled fallow,and wheat after calibration.This study illustrates the most recent WEPP model's performance for runoff and soil loss predictions,and provides a comprehensive set of results.

关 键 词：WEPP RUNOFF Soil loss CALIBRATION VALIDATION 

分 类 号：S157.1[农业科学—土壤学]