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首页> 外文期刊>Journal of the American Water Resources Association >EFFECT OF WATERSHED SUBDIVISION AND FILTER WIDTH ON SWAT SIMULATION OF A COASTAL PLAIN WATERSHED
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EFFECT OF WATERSHED SUBDIVISION AND FILTER WIDTH ON SWAT SIMULATION OF A COASTAL PLAIN WATERSHED

机译：流域细分和过滤宽度对沿海平原流域特警模拟的影响

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摘要

The Soil and Water Assessment Tool (SWAT) does not fully simulate riparian buffers, but has a simple filter function that is responsive to filter strip width (FILTERW). The objectives of this study were to (1) evaluate SWAT hydrology and water quality response to changes in watershed subdivision levels and different FILTERW configurations and (2) provide guidance for selecting appropriate watershed subdivision for model runs that include the riparian buffer feature through the FILTERW parameter. Watershed subdivision level is controlled by the critical source area (CSA) which defines the minimum drainage area required to form the origin of a stream. SWAT was calibrated on a 15.7 km~2 subdrainage within the Little River Experimental Watershed, Georgia. The calibrated parameter set was applied to 32 watershed configurations consisting of four FILTERW representations for each of eight CSA levels. Streamflow predictions were stable regardless of watershed subdivision and FILTERW configuration. Predicted sediment and nutrient loads from upland areas decreased as CSA increased when spatial variations of riparian buffers are considered. Sediment and nutrient yield at the watershed outlet was responsive to different combinations of CSA and FILTERW depending on selected in-stream processes. CSA ranges which provide stable sediment and nutrient yields at the watershed outlet was suggested for avoiding significant modifications in selected parameter set.
机译：土壤和水评估工具（SWAT）不能完全模拟河岸缓冲带，但是具有简单的过滤功能，可对滤纸条宽度（FILTERW）做出响应。这项研究的目的是（1）评估SWAT水文和水质对流域细分水平和不同FILTERW配置变化的响应，以及（2）为通过FILTERW选择包括河岸缓冲特征的模型运行选择合适的流域细分提供指导参数。流域细分水平由关键水源区（CSA）控制，CSA定义了形成河流原点所需的最小排水区。特警队在佐治亚州小河实验流域内的15.7 km〜2排水沟上进行了校准。将校准的参数集应用于32个分水岭配置，其中包括八个CSA级别中每个级别的四个FILTERW表示形式。无论分水岭细分和FILTERW配置如何，流量预测都是稳定的。当考虑河岸缓冲带的空间变化时，随着CSA的增加，来自高地地区的预计沉积物和营养物负荷会减少。分水岭出口处的沉积物和养分产量对CSA和FILTERW的不同组合有响应，具体取决于选定的流内过程。建议在流域出口处提供稳定的沉积物和养分产量的CSA范围，以避免对所选参数集进行重大修改。

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