Estimating groundwater-river connectivity factor for quantifying changes in irrigation return flows in the Murray–Darling Basin

IF 2.4 Q2 WATER RESOURCES

Australasian Journal of Water Resources Pub Date : 2020-07-02 DOI:10.1080/13241583.2020.1787702

G. Walker, Quan J. Wang, A. Horne, Rick Evans, S. Richardson

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引用次数: 14

Abstract

ABSTRACT Concerns have been raised that the use of infrastructure and water efficiency projects to recover water entitlements for the environment in the Murray–Darling Basin (MDB) could be undermined by a reduction in return flows to rivers. Water use efficiency changes prior to 2009 had already reduced surface return flows. A dimensionless and normalised variable, connectivity factor (CF), has been used to analyse the cumulative impact on river flow from actions that alter groundwater recharge or extraction. CF is objectively estimated from existing modelling outputs for three large alluvial groundwater systems in south-eastern MDB relevant to a major water use efficiency program. Lower values of CF (0.05–0.45) imply lower reductions of return flows, less impacts on recovered water entitlements, with impacts more likely to be managed adaptively within current water management plans. The study should help allay concerns by explaining why previous estimates had been overly high.

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估算地下水-河流连通性因子以量化墨累-达令盆地灌溉回流的变化

摘要有人担心，在墨累-达令盆地（MDB），利用基础设施和水效率项目恢复环境用水权利可能会因河流回流的减少而受到损害。2009年之前的用水效率变化已经减少了地表回流。一个无量纲和归一化变量，连通性因子（CF），已被用于分析改变地下水补给或开采的行为对河流流量的累积影响。CF是根据与主要用水效率计划相关的MDB东南部三个大型冲积地下水系统的现有建模输出进行客观估计的。CF值越低（0.05–0.45）意味着回流减少越少，对回收水权利的影响越小，影响更有可能在当前的水管理计划中得到适应性管理。这项研究应该有助于通过解释为什么之前的估计过高来减轻人们的担忧。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Australasian Journal of Water Resources WATER RESOURCES-

CiteScore

5.10

自引率

21.90%

发文量

期刊介绍： The Australasian Journal of Water Resources ( AJWR) is a multi-disciplinary regional journal dedicated to scholarship, professional practice and discussion on water resources planning, management and policy. Its primary geographic focus is on Australia, New Zealand and the Pacific Islands. Papers from outside this region will also be welcomed if they contribute to an understanding of water resources issues in the region. Such contributions could be due to innovations applicable to the Australasian water community, or where clear linkages between studies in other parts of the world are linked to important issues or water planning, management, development and policy challenges in Australasia. These could include papers on global issues where Australasian impacts are clearly identified.