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首页> 外文期刊>Journal of the American Water Resources Association >CHARACTERIZATION OF STORM FLOW DYNAMICS OF HEADWATER STREAMS IN THE SOUTH CAROLINA LOWER COASTAL PLAIN
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CHARACTERIZATION OF STORM FLOW DYNAMICS OF HEADWATER STREAMS IN THE SOUTH CAROLINA LOWER COASTAL PLAIN

机译：南卡罗来纳州下部沿海平原上游水流风暴流动力学特征

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摘要

Hydrologic monitoring was conducted in two first-order lower coastal plain watersheds in South Carolina, United States, a region with increasing growth and land use change. Storm events over a three-year period were analyzed for direct runoff coefficients (ROC) and the total storm response (TSR) as percent rainfall. ROC calculations utilized an empirical hydrograph separation method that partitioned total streamflow into sustained base flow and direct runoff components. ROC ratios ranged from 0 to 0.32 on the Upper Debidue Creek (UDC) watershed and 0 to 0.57 on Watershed 80 (WS80); TSR results ranged from 0 to 0.93 at UDC and 0.01 to 0.74 at WS80. Variability in event runoff generation was attributed to seasonal trends in water table elevation fluctuation as regulated by evapotranspiration. Groundwater elevation breakpoints for each watershed were identified based on antecedent water table elevation, streamflow, ROCs, and TSRs. These thresholds represent the groundwater elevation above which event runoff generation increased sharply in response to rainfall. For effective coastal land use decision making, baseline watershed hydrology must be understood to serve as a benchmark for management goals, based on both seasonal and event-based surface and groundwater interactions.
机译：在美国南卡罗来纳州这两个增长和土地用途变化不断增加的地区的两个一级低层沿海平原流域进行了水文监测。分析了三年期间的暴风雨事件的直接径流系数（ROC）和总暴雨响应（TSR）的降雨百分比。 ROC计算使用经验水文法分离方法，该方法将总流量分为持续的基本流量和直接径流成分。在上德比迪克里克（UDC）流域，ROC比率范围从0到0.32，在分水岭80（WS80）上，ROC比率范围从0到0.57； TSR结果在UDC范围从0到0.93，在WS80范围从0.01到0.74。事件径流产生的可变性归因于蒸散量调节的地下水位高低波动的季节性趋势。根据先前的地下水位高程，水流，ROC和TSR确定每个流域的地下水高程断点。这些阈值代表地下水高度，在该高度以上，事件径流的产生会响应降雨而急剧增加。为了有效地进行沿海土地利用决策，必须将基线流域水文学理解为基于季节和基于事件的地表水和地下水相互作用的管理目标的基准。

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