砖红壤区WEPP模型土壤参数的率定

通过砖红壤坡面室内模拟降雨试验测得径流产沙资料,由径流产沙资料率定土壤参数有效水力传导率、细沟可蚀性参数和土壤临界剪切力.结果表明,有效水力传导率值为16.7 mm/h,细沟可蚀性参数为0.005 s/m,土壤剪切力为4.0 Pa.根据Nash-Sutcliffe有效性进行有效性检验,结果表明砖红壤区土壤参数的率定结果合理,可应用率定的土壤参数进行砖红壤区WEPP模型的模拟.

Calibrating of WEPP soil parameters on laterite area

Effective hydraulic conductivity, rill erodibility and soil critical shear stress were calibrated by field observed data of runoff and sediment load from rainfall simulation experiment of laterite. The calibrated values of the above three soil parameters were 16.7 mm/h,0.005 s/m, and 4.0 Pa. The testing calibrated results used Nash-Sutcliffe model efficiency (ME) found that calibrated results were reasonable and the calibrated values could be used to assess WEPP model application on the laterite soil area.