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首页> 外文期刊>Journal of the American Water Resources Association >Representing the Connectivity of Upland Areas to Floodplains and Streams in SWAT+
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Representing the Connectivity of Upland Areas to Floodplains and Streams in SWAT+

机译：代表SWAT +中高地与洪泛区和河流的连通性

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In recent years, watershed modelers have put increasing emphasis on capturing the interaction of landscape hydrologic processes instead of focusing on streamflow at the watershed outlet alone. Understanding the hydrologic connectivity between landscape elements is important to explain the hydrologic response of a watershed to rainfall events. The Soil and Water Assessment Tool+ (SWAT+) is a new version of SWAT with improved runoff routing capabilities. Subbasins may be divided into landscape units (LSUs), e.g., upland areas and floodplains, and flow can be routed between these LSUs. We ran three scenarios representing different extents of connectivity between uplands, floodplains, and streams. In the first and second scenarios, the ratio of channelized flow from the upland to the stream and sheet flow from the upland to the floodplain was 70/30 and 30/70, respectively, for all upland/floodplain pairs. In the third scenario, the ratio was calculated for each upland/floodplain pair based on the upland/floodplain area ratio. Results indicate differences in streamflow were small, but the relative importance of flow components and upland areas and floodplains as sources of surface runoff changed. Also, the soil moisture in the floodplains was impacted. The third scenario was found to provide more realistic results than the other two. A realistic representation of connectivity in watershed models has important implications for the identification of pollution sources and sinks.
机译：近年来，流域建模者越来越重视捕获景观水文过程的相互作用，而不是仅仅关注流域出口处的径流。了解景观要素之间的水文连通性对于解释流域对降雨事件的水文响应很重要。土壤和水评估工具+（SWAT +）是SWAT的新版本，具有改进的径流路由功能。子流域可以分为景观单位（LSU），例如高地和洪泛区，并且可以在这些LSU之间路由流量。我们运行了三种方案，分别代表了高地，洪泛区和河流之间的不同程度的连通性。在第一种和第二种情况下，对于所有高地/洪泛平原对，从高地流向河流的渠道化流量与从高地流向洪泛区的表层流量之比分别为70/30和30/70。在第三种情况下，将根据陆地/洪泛区面积比计算每个高地/洪泛区对的比率。结果表明，径流的差异很小，但作为地表径流来源的流量分量，高地和洪泛区的相对重要性发生了变化。此外，洪泛区的土壤水分也受到影响。发现第三个方案比其他两个方案提供了更现实的结果。流域模型中连通性的真实表示对于识别污染源和汇具有重要意义。

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