Quantifying groundwater resilience through conjunctive use for irrigated agriculture in a constrained aquifer system
Quantifying groundwater resilience through conjunctive use for irrigated agriculture in a constrained aquifer system
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DOI：
10.1016/j.jhydrol.2018.08.003
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发表时间：
2018-10-01
影响因子：
6.4
通讯作者：
King, James P.
中科院分区：
文献类型：
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作者：
Fuchs, Erek H.;Carroll, Kenneth C.;King, James P.
位于新墨西哥州中南部干旱地区的林孔山谷尤其受到地表水供应减少的影响，因为地下水的贡献受到含水层限制的限制。象丘灌溉区（EBID）的地表水分配短缺减少了补给。农民继续抽取地下水以满足作物需求，使影响更加严重。联合使用假定含水层具有复原力（即，吸收抽水压力的能力），但不一定在干旱。本研究通过分析EBID地下水监测项目的数据，进一步开发了地下水位波动方法，以揭示2009年至2016年流域净蓄水量变化的空间和年际变化的联合使用控制，并引入了地下水-地表水应用比（GSRA），这有可能表征联合使用环境中的系统弹性。回归模型表明，在每年EBID地表水分配的变化密切相关，年终地下水位高程，甚至更强烈的比每年的地下水提取灌溉，这表明可变的地表水分配是这个系统的主要驱动力。截至2011年，含水层的脱水显著改变了系统水文，因此从2011年到2016年，储存量的净变化与年度地表水分配密切相关，对应于同期的大型河流损失，但导致2014年至2016年储存量的净增加。快速存储损失和反弹，在这个受约束的含水层系统允许量化含水层的弹性，使GSRA作为一个潜在的规划指标的发展。
The Rincon Valley in arid, south-central New Mexico, is especially impacted by reduced surface water supply because the contribution of groundwater is limited by aquifer constraints. Consecutive surface water allotment shortages in the Elephant Butte Irrigation District (EBID) have reduced recharge. The effects are compounded by farmers continuing to extract groundwater to meet crop requirements. Conjunctive use assumes aquifer resilience (i.e., ability to absorb pumping stress), but not necessarily in drought. This study further develops the water table fluctuation method by analyzing data from the EBID's groundwater monitoring program to reveal conjunctive use controls over the spatial and interannual variability of net storage changes from 2009 to 2016 in the Valley and introduces the term groundwater-surface water ratio of application (GSRA), that has potential for characterizing system resilience in conjunctive use settings. Regression modeling shows that variation in the annual EBID surface water allotment correlates strongly with year-end water table elevations, even more strongly than total annual groundwater extractions for irrigation, suggesting that variable surface water allotments are a primary driver of this system. Dewatering of the aquifer as of 2011 significantly altered the system hydrology such that from 2011 to 2016, net change in storage correlates strongly with the annual surface water allotment, corresponding to large river losses for the same period, but resulting in net gains in storage from 2014 to 2016. Rapid storage loss and rebound in this constrained aquifer system allowed quantification of aquifer resilience, enabling the development of a GSRA as a potential planning metric.