Recession slope curve analysis under human interferences
Recession slope curve analysis under human interferences
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DOI：
10.1016/j.advwatres.2010.06.010
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发表时间：
2010-09
影响因子：
4.7
通讯作者：
Dingbao Wang;Ximing Cai
中科院分区：
文献类型：
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作者：
Dingbao Wang;Ximing Cai
为了研究流域尺度的基流衰退，Brutsaert和Nieber [10]提出的−dQ/dt Q的对数尺度图已用于估计衰退参数，即，理论后退斜率曲线的斜率和截距。在一些研究中，通常使用下包络线或最佳拟合来确定自然流域的衰退斜率曲线。然而，世界上大多数流域都存在人为干扰。本文讨论了人为干扰（包括地下水抽水、引水和回流）对确定后退斜率曲线和−dQ/dt Q数据点云形的影响。首先，分析假设流域生成的−dQ/dt值。然后，对伊利诺伊州三个流域的真实的数据进行了分析，以验证假设的分析。退坡曲线的位置取决于蒸散、地下水抽水甚至引水（如果存在）和回流的共存和相对量。当水消耗率较小时，衰退斜率曲线甚至可以位于代表历史数据的点云的上包络线处。这些结果表明，使用较低的包络线作为准则，估计受人为干扰的流域衰退参数可能会导致有偏估计。
To study the base flow recession at the watershed scale, the log-scale plot of −dQ/dt∼Q proposed by Brutsaert and Nieber [10] has been used to estimate the recession parameters, i.e., the slope and interception of the theoretical recession slope curve. The lower envelope or the best fit in some studies is usually used to determine the recession slope curve for natural watersheds. However, human interferences exist in most watersheds around the world. This paper discusses the impact of human interferences, which include groundwater pumping, water diversion and return flow, on the determination of the recession slope curve and the cloud shape of the data points of −dQ/dt∼Q. First, values of −dQ/dt generated for hypothetical watersheds are analyzed. Then real data for three watersheds in Illinois is analyzed to verify the hypothetical analysis. The placement of the recession slope curve depends on the coexistence and relative amount of the evapotranspiration, groundwater pumping or even water diversion if it exists, and the return flow. When the water consumption rate is small, the recession slope curve can even be located at the upper envelope of the cloud of points representing historical data. These results suggest that the use of the lower envelope as a guideline for estimating recession parameters for watersheds subject to human interferences can result in biased estimates.