An Integrated Approach Toward Sustainability via Groundwater Banking in the Southern Central Valley, California
An Integrated Approach Toward Sustainability via Groundwater Banking in the Southern Central Valley, California
复制标题
通过加利福尼亚州中央山谷南部地下水库实现可持续发展的综合方法
作者：
Mehdi Ghasemizade;K. Asante;Christian E. Petersen;T. Kocis;H. Dahlke;T. Harter
加利福尼亚州密集的地下水开采已导致一些地区的溪流和含水层枯竭。农业管理含水层补给(农业管理含水层补给)倡议最近在加利福尼亚州试行，以减轻不可持续的地下水开采的影响。这些举措依赖于收集年多雨的水，并将其传播到大面积的灌溉农田，以增加对含水层的补给。虽然补给研究通常考虑对含水层储存的局部影响，但很少有研究在区域范围内调查银-MAR的益处和挑战。在这里，我们使用综合水流模型，来评估银河流域项目如何影响加州中央山谷南部的径流、分流、抽水和不饱和带水流。我们进一步测试了基于不同土壤适宜性阈值选择的三种不同的Ag-MAR空间格局对水文系统的敏感性。这项研究调查了银河流域土地的分布如何使区域地下水系统和其他水量平衡部分受益。结果表明，银-MAR收益随银-MAR区域位置的不同而不同。河流-含水层的相互作用在决定是否有能力增加超采盆地中的地下水储存量方面发挥着关键作用。结果还表明，在11-4月补给季节进行的银河-MAR项目对银河-MAR季节以外的水权有影响。如果没有适当的监测，银-MAR可能会导致地下水位上升，进入根区，对敏感作物产生负面影响。我们的工作还强调了在区域范围内使用综合水文和管理模式评估银河流域的好处。
Intensive groundwater withdrawals in California have resulted in depletion of streams and aquifers in some regions. Agricultural managed aquifer recharge (Ag‐MAR) initiatives have recently been piloted in California to mitigate the effects of unsustainable groundwater withdrawals. These initiatives rely on capturing wet‐year water and spreading it on large areas of irrigated agricultural lands to enhance recharge to aquifers. While recharge studies typically consider local effects on aquifer storage, few studies have investigated Ag‐MAR benefits and challenges at a regional scale. Here we used the Integrated Water Flow Model, to evaluate how Ag‐MAR projects can affect streamflows, diversions, pumping, and unsaturated zone flows in the southern Central Valley, California. We further tested the sensitivity of three different spatial patterns of Ag‐MAR, each chosen based on different thresholds of soil suitability, on the hydrologic system. This study investigates how the distribution of Ag‐MAR lands benefit the regional groundwater system and other water balance components. The results suggest that Ag‐MAR benefits vary as a function of the location of Ag‐MAR lands. Stream‐aquifer interactions play a crucial factor in determining the ability to increase groundwater storage in overdrafted basins. The results also indicate that Ag‐MAR projects conducted during the November–April recharge season have implications for water rights outside of the Ag‐MAR season. If not properly monitored, Ag‐MAR can cause a rise of groundwater table into the root zone, negatively impacting sensitive crops. Our work also highlights the benefits of using an integrated hydrologic and management model to evaluate Ag‐MAR at a regional scale.