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首页> 外文期刊>Geophysical Research Letters >Comparative study of climate and human impacts on seasonal baseflow in urban and agricultural watersheds
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Comparative study of climate and human impacts on seasonal baseflow in urban and agricultural watersheds

机译：气候和人类对城市和农业流域季节性基流影响的比较研究

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This study explores the long-term trends of low flow magnitude and the slopes and shapes of the recession curves during winter and summer seasons under climatic and human factors. Four watersheds in the American Midwest are selected for the analysis, including two urban watersheds (Salt Creek and Des Plaines) and two agricultural watersheds (Embarras and Kankakee). The results show that the long-term baseflow recession slope trends in all the watersheds are primarily induced by human interferences. In the urban watersheds, the recession slopes decrease over time in both winter and summer due to effluent discharges. In the Kankakee watershed with irrigation, the recession slopes decrease in winter but increase in summer, and the opposite winter and summer trends are caused by the seasonal water use regime of irrigated agriculture. In the Embarras watershed with rainfed agriculture, the recession slopes decrease over time in winter but display no change in summer. Sources of water withdrawal (groundwater versus surface water) also have different impacts on the recession process. This long-term analysis of recession rates, in conjunction with the changes in low flow magnitude, offers valuable insight on human interferences to hydrologic processes. Beyond the specific case studies, this paper documents how a scientific approach based on existing streamflow observation can be applied to improving our understanding of the impact of human and climatic influences on baseflow and low flow processes.
机译：这项研究探讨了在气候和人为因素的作用下，冬季和夏季低流量幅度的长期趋势以及衰退曲线的斜率和形状。选择了美国中西部的四个集水区进行分析，包括两个城市集水区（Salt Creek和Des Plaines）和两个农业集水区（Embarras和Kankakee）。结果表明，所有流域的长期基流衰退趋势都是由人为干扰引起的。在城市流域，由于污水排放，衰退坡度在冬季和夏季随时间推移而减小。在灌溉灌溉的坎卡基河流域中，衰退坡度在冬季减少，而在夏季增加，并且相反的冬季和夏季趋势是由灌溉农业的季节性用水方式引起的。在雨育农业的恩巴拉斯流域，冬季的衰退坡度随着时间的推移而减少，而夏季则没有变化。取水源（地下水与地表水）对衰退过程的影响也不同。对衰退率的长期分析以及低流量的变化，为人类对水文过程的干扰提供了宝贵的见识。除了特定的案例研究之外，本文还介绍了如何将基于现有流量观测的科学方法应用于增进我们对人为和气候影响对基础流量和低流量过程的影响的理解。

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