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侧向土壤水再分配机制对湿润山区产流过程具有重要影响,是提升山坡水文模型模拟精度的关键环节,然而现有水文模型中多缺少对该机制的合理刻画。以抚河流域上游沙子岭2008～2023年日径流模拟为例,考虑地形和土壤各向饱和导水率差异,通过耦合侧向(饱和)壤中流和地下径流过程,对WEP-L分布式水文模型进行了改进,并进一步揭示了侧向(饱和)壤中流机制对土壤水再分配和产流过程的重要影响。结果表明,模型改进后,率定期(2008～2018年)年日径流NNSE提升0.07,验证期(2019～2023年)日径流NNSE提升0.11,RRE指标变化不明显;在洪水事件模拟中,洪峰平均误差改善最明显,验证期该指标减少了29.79%,其次为径流深误差,减少了19.62%;模型改进后含水层多年蓄变量平均值分别由177.48 mm降为6.96 mm,同时壤中径流量显著增加。改进模型主要通过减少洪峰模拟误差来提升整体模拟性能,并通过耦合地下径流和壤中流计算给出了更合理的含水层蓄变量动态变化,适用于湿润山区小流域的水文模拟,在流域水资源管理方面具有深入发展和应用的价值。
Abstract：The mechanism of lateral soil water redistribution plays a significant role in runoff generation in humid mountainous regions and is key to improving the accuracy of hillslope hydrological models. However, most existing hydrological models lack a proper representation of this mechanism. Taking the daily runoff simulation in Shaziling, the upper reaches of the Fuhe River basin from 2008 to 2023 as a case study, the WEP-L distributed hydrological model was improved by coupling lateral(saturated) interflow and groundwater runoff processes, considering differences in topography and soil anisotropy in saturated hydraulic conductivity. The findings further reveal the important impact of the lateral(saturated) interflow mechanism on soil water redistribution and runoff generation. The results show that after model improvement, the daily runoff NSE increased by 0.07 during the calibration period(2008-2018) and by 0.11 during the validation period(2019-2023), while the RE metric showed no obvious change. In flood event simulations, the improvement in mean peak error was most notable, decreasing by 29.79% during the validation period, followed by the runoff depth error, which decreased by 19.62%. After the improvement, the multi-year average aquifer storage variable dropped from 177.48 mm to 6.96 mm, while interflow increased significantly. The improved model enhances overall simulation performance by reducing flood peak errors and provides a more reasonable representation of aquifer storage dynamics by coupling groundwater runoff and interflow calculations, which is suitable for hydrological simulations in small humid mountainous catchments and holds potential for further development and application in watershed water resources management.
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基本信息:
DOI：10.20040/j.cnki.1000-7709.2026.20260993
中图分类号:TV121
引用信息:
[1]王东东,杜军凯,贾仰文,等.基于侧向土壤水再分配的沙子岭流域山区水文模型改进[J].水电能源科学,2026(11):1-6.DOI:10.20040/j.cnki.1000-7709.2026.20260993.
基金信息:
国家自然科学基金面上项目（52279030）
2026-10-27
2026-10-27
2026-10-27