McCallum Andrew M, Andersen Martin S, Acworth R Ian
Connected Waters Initiative, University of New South Wales, Sydney, NSW, Australia.
Ground Water. 2014 Mar-Apr;52(2):291-7. doi: 10.1111/gwat.12046. Epub 2013 Apr 2.
In semiarid and arid environments, leakage from rivers is a major source of recharge to underlying unconfined aquifers. Differential river gauging is widely used to estimate the recharge. However, the methods commonly applied are limited in that the temporal resolution is event-scale or longer. In this paper, a novel method is presented for quantifying both the total recharge volume for an event, and variation in recharge rate during an event from hydrographs recorded at the upstream and downstream ends of a river reach. The proposed method is applied to river hydrographs to illustrate the method steps and investigate recharge processes occurring in a sub-catchment of the Murray Darling Basin (Australia). Interestingly, although it is the large flood events which are commonly assumed to be the main source of recharge to an aquifer, our analysis revealed that the smaller flow events were more important in providing recharge.
在半干旱和干旱环境中，河流渗漏是补给下方无压含水层的主要来源。差分河流测量被广泛用于估算补给量。然而，常用方法存在局限性，其时间分辨率为事件尺度或更长。本文提出了一种新方法，用于根据河段上下游记录的水文曲线量化事件的总补给量以及事件期间补给率的变化。将该方法应用于河流水文曲线，以说明方法步骤并研究墨累-达令盆地（澳大利亚）一个子流域内发生的补给过程。有趣的是，尽管通常认为大洪水事件是含水层补给的主要来源，但我们的分析表明，较小流量事件在提供补给方面更为重要。
