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The role of stony soils in hillslope and catchment runoff formation
Journal of Hydrology and Hydromechanics ( IF 1.9 ) Pub Date : 2020-06-01 , DOI: 10.2478/johh-2020-0012
Babar Mujtaba 1 , Hana Hlaváčiková 2 , Michal Danko 3 , João L.M.P. de Lima 1 , Ladislav Holko 3
Affiliation  

Abstract The role of stony soils in runoff response of mountain catchments is rarely studied. We have compared simulated response of stony soils with measured catchment runoff for events caused by rains of small and high intensities in the mountain catchment of the Jalovecký Creek, Slovakia. The soil water response was simulated for three sites with stoniness 10–65% using the Hydrus-2D single porosity model. Soil hydraulic parameters employed in the modelling, i. e. the saturated hydraulic conductivity and parameters of the soil water retention curves, were obtained by two approaches, namely by the Representative Elementary Volume approach (REVa) and by the inverse modelling with Hydrus-1D model (IMa). The soil water outflow hydrographs simulated by Hydrus-2D were compared to catchment runoff hydrographs by analysing their skewness and peak times. Measured catchment runoff hydrographs were similar to simulated soil water outflow hydrographs for about a half of rainfall events. Interestingly, most of them were caused by rainfalls with small intensity (below 2.5 mm/10 min). The REV approach to derive soil hydraulic parameters for soil water outflow modelling provided more realistic shapes of soil water outflow hydrographs and peak times than the IMa approach.

中文翻译:

石质土壤在山坡和集水区径流形成中的作用

摘要 石质土壤在山区流域径流响应中的作用鲜有研究。对于斯洛伐克 Jalovecký Creek 山区集水区小雨和高强度降雨引起的事件,我们比较了石质土壤的模拟响应与实测集水径流。使用 Hydrus-2D 单孔隙度模型模拟了三个石度为 10-65% 的地点的土壤水分响应。建模中采用的土壤水力参数,即饱和导水率和土壤保水曲线参数,通过两种方法获得,即代表性基本体积法 (REVa) 和 Hydrus-1D 模型 (IMa) 的逆向建模)。通过分析 Hydrus-2D 模拟的土壤水流出过程线与集水径流过程线的偏度和峰值时间进行比较。对于大约一半的降雨事件,测得的集水区径流过程线与模拟的土壤水流出过程线相似。有趣的是,其中大部分是由强度较小(低于 2.5 毫米/10 分钟)的降雨引起的。与 IMa 方法相比,用于导出土壤水流出建模的土壤水力参数的 REV 方法提供了更真实的土壤水流出水位线和峰值时间形状。
更新日期:2020-06-01
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