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首页> 外文期刊>Journal of the American Water Resources Association >VARIABLE SOURCE AREA HYDROLOGY MODELING WITH THE WATER EROSION PREDICTION PROJECT MODEL
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VARIABLE SOURCE AREA HYDROLOGY MODELING WITH THE WATER EROSION PREDICTION PROJECT MODEL

机译：水蚀预测模型的可变源区水文模拟

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摘要

In nondegraded watersheds of humid climates, subsurface flow patterns determine where the soil saturates and where surface runoff is occurring. Most models necessarily use infiltration-excess (i.e., Hortonian) runoff for predicting runoff and associated constituents because subsurface flow algorithms are not included in the model. In this article, we modify the Water Erosion Prediction Project (WEPP) model to simulate subsurface flow correctly and to predict the spatial and temporal location of saturation, the associated lateral flow and surface runoff, and the location where the water can re-infiltrate. The modified model, called WEPP-UI, correctly simulated the hillslope drainage data from the Coweeta Hydrologic Laboratory hillslope plot. We applied WEPP-UI to convex, concave, and S-shaped hillslope profiles, and found that multiple overland flow elements are needed to simulate distributed lateral flow and runoff well. Concave slopes had the greatest runoff, while convex slopes had the least. Our findings concur with observations in watersheds with saturation-excess overland flow that most surface runoff is generated on lower concave slopes, whereas on convex slopes runoff infiltrates before reaching the stream. Since the WEPP model is capable of simulating both saturation-excess and infiltration-excess runoff, we expect that this model will be a powerful tool in the future for managing water quality.
机译：在潮湿气候的未退化流域，地下流动模式决定了土壤饱和的位置和发生地表径流的位置。由于模型中未包含地下流量算法，因此大多数模型必定会使用渗入过多（即，霍顿）径流来预测径流和相关成分。在本文中，我们修改了水蚀预测项目（WEPP）模型，以正确模拟地下流量，并预测饱和度的时空位置，相关的侧向流量和地表径流以及水可以重新渗入的位置。修改后的模型称为WEPP-UI，可以正确模拟来自Coweeta水文实验室山坡图的山坡排水数据。我们将WEPP-UI应用于凸形，凹形和S形山坡剖面，并发现需要多个陆上流要素来模拟分布的侧向流和径流井。凹形坡面径流量最大，而凸形坡面流量最小。我们的发现与在具有饱和度过量的陆流的流域上的观测结果一致，即大多数表面径流是在较低的凹面斜坡上产生的，而在凸面斜坡上，径流在到达河流之前就已渗入。由于WEPP模型能够模拟饱和度和入渗径流，因此我们希望该模型将来将成为管理水质的强大工具。

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