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首页> 外文期刊>Journal of the American Water Resources Association >CURVE NUMBER DERIVATION FOR WATERSHEDS DRAINING TWO HEADWATER STREAMS IN LOWER COASTAL PLAIN SOUTH CAROLINA, USA
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CURVE NUMBER DERIVATION FOR WATERSHEDS DRAINING TWO HEADWATER STREAMS IN LOWER COASTAL PLAIN SOUTH CAROLINA, USA

机译：美国南卡罗莱纳州下部沿海平原流失两个流域的流域排水的曲线数推导

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摘要

The objective of this study was to assess curve number (CN) values derived for two forested headwater catchments in the Lower Coastal Plain (LCP) of South Carolina using a three-year period of storm event rainfall and runoff data in comparison with results obtained from CN method calculations. Derived CNs from rainfall/runoff pairs ranged from 46 to 90 for the Upper Debidue Creek (UDC) watershed and from 42 to 89 for the Watershed 80 (WS80). However, runoff generation from storm events was strongly related to water table elevation, where seasonally variable eyapotranspirative wet and dry moisture conditions persist. Seasonal water table fluctuation is independent of, but can be compounded by, wet conditions that occur as a result of prior storm events, further complicating flow prediction. Runoff predictions for LCP first-order watersheds do not compare closely to measured flow under the average moisture condition normally associated with the CN method. In this study, however, results show improvement in flow predictions using CNs adjusted for antecedent runoff conditions and based on water table position. These results indicate that adaptations of CN model parameters are required for reliable flow predictions for these LCP catchments with shallow water tables. Low gradient topography and shallow water table characteristics of LCP watersheds allow for unique hydrologic conditions that must be assessed and managed differently than higher gradient watersheds.
机译：这项研究的目的是使用为期三年的暴雨事件降雨和径流数据，以及从中获得的结果，评估南卡罗来纳州下沿海平原（LCP）的两个森林水源流域的曲线数（CN）值。 CN方法计算。上/下河（UDC）流域的降雨/径流对派生的CN范围从46到90，而分水岭80（WS80）的派生CN范围从42到89。然而，暴风雨产生的径流与地下水位高度密切相关，在那里季节性变化的杂散蒸腾干湿条件持续存在。地下水位的季节性波动与先前暴雨事件的结果所导致的潮湿条件无关，但也可能使之复杂化，这使流量预测更加复杂。 LCP一阶流域的径流预测与通常与CN方法相关的平均湿度条件下的实测流量没有紧密比较。然而，在这项研究中，结果表明，使用根据前期径流条件进行调整并基于地下水位的CN可以改善流量预测。这些结果表明，对于具有浅水位的这些LCP集水区的可靠流量预测，需要对CN模型参数进行调整。 LCP流域的低坡度地形和浅水位特征允许与高坡度流域相比必须以不同的方式评估和管理独特的水文条件。

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    Thomas H. Epps; Daniel R. Hitchcock; Anand D. Jayakaran; Drake R. Loflin; Thomas M. Williams; Devendra M. Amatya;

  • 作者单位

    Biosystems Engineering Program, School of Agricultural, Forest, and Environmental Sciences, P.O. Box 596, Clemson University, Georgetown, South Carolina 29442;

    Baruch Institute of Coastal Ecology & Forest Science, School of Agricultural, Forest, and Environmental Sciences, P.O. Box 596, Clemson University, Georgetown, South Carolina 29442;

    Baruch Institute of Coastal Ecology & Forest Science, School of Agricultural, Forest, and Environmental Sciences, P.O. Box 596, Clemson University, Georgetown, South Carolina 29442;

    Biosystems Engineering Program, School of Agricultural, Forest, and Environmental Sciences, P.O. Box 596, Clemson University, Georgetown, South Carolina 29442;

    Baruch Institute of Coastal Ecology & Forest Science, School of Agricultural, Forest, and Environmental Sciences, P.O. Box 596, Clemson University, Georgetown, South Carolina 29442;

    USDA Forest Service, Center for Forested Wetlands Research, Cordesville, South Carolina 29434;

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  • 正文语种 eng
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  • 关键词

    surface water/groundwater interactions; runoff; stormwater management; watershed management; curve number method; first-order streams;

    机译：地表水/地下水相互作用;径流;雨水管理;分水岭管理;曲线数法一阶流;

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