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首页> 外文期刊>Hydrology and Earth System Sciences >Physically-based modelling of hydrological processes in a tropical headwater catchment (West Africa) – process representation and multi-criteria validation
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Physically-based modelling of hydrological processes in a tropical headwater catchment (West Africa) – process representation and multi-criteria validation

机译：基于热带的流域（西非）水文过程的基于物理的建模-过程表示和多准则验证

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The aim of the study was to test the applicability of a physically-basedmodel to simulate the hydrological processes in a headwater catchment inBenin. Field investigations in the catchment have shown that lateralprocesses such as surface runoff and interflow are most important.Therefore, the 1-D SVAT-model SIMULAT was modified to a semi-distributedhillslope version (SIMULAT-H). Based on a good database, the model wasevaluated in a multi-criteria validation using discharge, dischargecomponents and soil moisture data. For the validation of discharge, goodresults were achieved for dry and wet years. The main differences wereobservable in the beginning of the rainy season. A comparison of thedischarge components determined by hydro-chemical measurements with thesimulation revealed that the model simulated the ratio of groundwater fluxesand fast runoff components correctly. For the validation of the dischargecomponents of single events, larger differences were observable, which waspartly caused by uncertainties in the precipitation data. The representationof the soil moisture dynamics by the model was good for the top soil layer.For deeper soil horizons, which are characterized by higher gravel content,the differences between simulated and measured soil moisture were larger.A good agreement of simulation results and field investigations was achievedfor the runoff generation processes. Interflow is the predominant process onthe upper and the middle slopes, while at the bottom of the hillslopegroundwater recharge and – during the rainy season – saturated overland floware important processes.
机译：该研究的目的是测试基于物理的模型来模拟贝宁上游水源流域水文过程的适用性。流域的实地调查表明，诸如地表径流和内流等横向过程最为重要，因此将一维SVAT模型SIMULAT修改为半分布式坡度版本（SIMULAT-H）。基于良好的数据库，使用排放，排放成分和土壤水分数据，通过多标准验证对模型进行了评估。为了验证放电效果，在干燥和潮湿的年份都取得了良好的效果。在雨季开始时可以观察到主要差异。通过水化学测量确定的排放成分与模拟结果的比较表明，该模型正确模拟了地下水通量与快速径流成分的比率。为了验证单个事件的排放成分，可以观察到较大的差异，部分原因是降水数据的不确定性。用该模型表示的土壤水分动力学对顶部土壤层是很好的。对于较深的土壤层（以较高的砾石含量为特征），模拟和测量的土壤水分之间的差异较大。 径流产生过程的模拟结果和实地调查得以实现。内流是上坡和中坡的主要过程，而在山坡的底部，地下水补给和（在雨季期间）饱和的陆上流是重要的过程。

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