基于SWAT模型不同产流及蒸发模式的径流模拟

摘要

Jian River Basin in Pengzhou city of Sichuan Province ,has successfully constructed distributed hy-drological model SWAT,which provides a combination including two methods to calculate surface runoff and three ways to calculate evapotranspiration ,using the years 2008-2009 runoff data for calibration ,by Nash co-efficient,correlation coefficient,relative error and the persistence coefficients It compares the applicability of the six combinations and has been verified by monthly runoff data in 2010 to 2011.The results showed that the introduction of a SWAT applicability evaluation criteria can achieve good results;SCS runoff curve number method,respectively Penma-Monteith method,a combination of simulation accuracy Hargreaves method is bet-ter,Nash coefficient of 0.8,the relative error is less than 20%for coefficient of 0.7 or more.This provides a ba-sis and reference for the selection model simulation.%针对四川省彭州市湔江流域，成功构建SWAT分布式水文模型，基于模型提供的两种计算地表径流方法和三种计算蒸散发方法的组合，采用2008-2009年月径流资料进行率定，通过Nash系数、相关系数、相对误差以及持续系数分析比较了6种组合模式下模型的适用性，并用2010-2011年月径流资料进行验证。结果表明，引入作为SWAT适用性评价标准可取得良好的效果； SCS 径流曲线数法分别与 Penman-Monteith 法、Hargreaves法的组合模拟精度较好， Nash系数均达到0.8，相对误差小于20%，持续系数达到0.7以上。这为模型模拟方法的选择提供了依据和参考。