Drywell Infiltration Performance: Tests, Monitoring, Simple, and Detailed Models

IF 5 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES
Lior Netzer, David Russo, Uri Nachshon, Ziv Moreno, Meni Ben-Hur, Roee Katzir, Yakov Livshitz, Daniel Kurtzman
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Abstract

Drywells, perforated above the water table, are an attractive tool for both reducing the risk of floods, and increasing groundwater recharge in urban\suburban areas. Various simplifications of the relationship between the injection discharge (Q) and the water-level rise in the drywell during water injection (H) are available. This work presents observations and models that improve our understanding of the drywell performance, namely the ratio Q/H for injections varying in time and dynamics. The drywell screen is at 22–27 m below surface in sandy porous medium, where the water table is at 40 m depth. The first set of observations were of six injection tests of constant Q, each lasting ∼30 min, performed on a daily basis. The Q/H ratio just before the end of each injection decreased each day. A simplified infiltration model assuming a radial sharp-wetting-front with an increase in the distance of the wetting front from the well fits the observations. A three-dimensional variably saturated numerical flow model simulating the six injection events showed that the sharp wetting front at increasing radius is a reasonable simplification for this type of injection schedule. Monitoring of operational injection of rainwater harvested from an adjacent rooftop for a few months of a Mediterranean winter shows the opposite—a slight increase in the Q/H ratio as winter progresses. When the plume of relatively high pressure-head reaches the water-table, a continuous passage of higher hydraulic conductivity between the drywell and the aquifer is opened, and the Q/H ratio is expected to increase.
干井渗透性能:测试、监测、简单和详细的模型
干井,在地下水位以上穿孔,是一个有吸引力的工具,既可以降低洪水的风险,又可以增加城市和郊区的地下水补给。注水量(Q)与干井注水时水位上升(H)之间的关系有多种简化形式。这项工作提供了观察结果和模型,提高了我们对干井性能的理解,即注入的Q/H比率随时间和动态变化。干井筛管位于砂质多孔介质地表以下22 ~ 27 m处,地下水位为40 m。第一组观察是每天进行6次恒定Q注射试验,每次持续~ 30分钟。每次注射结束前的Q/H比每天都在下降。假设有径向尖锐湿润锋且湿润锋距离较远的简化入渗模型与观测结果吻合。三维变饱和数值流动模型模拟了6种注油过程,结果表明,增大半径的尖锐湿润锋是该类注油过程的合理简化。在地中海冬季的几个月里,对从相邻屋顶收集的雨水进行的监测显示了相反的结果——随着冬季的进行,Q/H比略有增加。当相对高压水头的羽流到达地下水位时,在干井和含水层之间打开了一条水力传导性较高的连续通道,Q/H比值有望增加。
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
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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