Simulated Effects of Quarry Dewatering Near a Municipal Well Field
Simulated Effects of Quarry Dewatering Near a Municipal Well Field
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市政井场附近采石场脱水的模拟效果
DOI：
10.1111/j.1745-6584.1990.tb02227.x
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发表时间：
1990
期刊：
影响因子：
2.6
通讯作者：
E. Bair
中科院分区：
文献类型：
--
作者：
S. Eberts;E. Bair
俄亥俄州哥伦布市近 15% 的市政供水来自位于赛奥托河 (Scioto River) 和大核桃溪 (Big Walnut Creek) 沿岸的四口径向集水井。位于赛奥托河附近的三口井的上游有五个不受控制的垃圾填埋场和两个运行采石场脱水系统的骨料矿场。在现有条件和与采石场脱水停止相关的各种假设条件下，渗滤液从垃圾填埋场迁移的流动路径，采用包含空间可变补给、透射率和导水率的两层稳态地下水流模型进行了模拟。该模型使用两组水位数据以及 Scioto River 和 Scioto Big Run 沿线渗流研究的结果进行了校准。模拟结果表明，采石场和垃圾填埋场附近的水位将上升到足以饱和一些垃圾填埋场废物的高度。与所有假设条件相关的预测流向表明，从垃圾填埋场迁移的渗滤液不会直接排放到收集井的捕获区；相反，渗滤液将被转移到一个或另一个采石场脱水系统和/或进入 Scioto 河。模型模拟还表明，研究区域内约 60% 的地下水是通过采石场脱水排出的，在正常抽水率下，集水井约 13% 的产量来自诱导水流渗透。
The City of Columbus, Ohio, obtains nearly 15 percent of its municipal water supply from four radial-collector wells located along the Scioto River and Big Walnut Creek. Upstream from the three wells located adjacent to the Scioto River are five uncontrolled landfills and two aggregate mines that operate quarry-dewatering systems. Flow paths along which leachate could migrate from the landfills, under existing conditions and under various hypothetical conditions related to the cessation of quarry dewatering, were simulated with a two-layer, steady-state, ground-water flow model incorporating spatially variable recharge, transmissivity, and hydraulic conductivity. The model was calibrated with two sets of water-level data and with the results of a seepage study along the Scioto River and Scioto Big Run. Results of simulations indicate that water levels near the quarries and landfills will rise to an altitude sufficient to saturate some of the landfill wastes. Predicted flow directions associated with all the hypothetical conditions indicate that leachate migrating from the landfills will not discharge directly into the capture zones of the collector wells; rather, the leachate will be diverted into one or the other quarry-dewatering systems and/or into the Scioto River. The model simulations also indicate that approximately 60 percent of the ground water discharged within the study area is by quarry dewatering, and about 13 percent of the yield of the collector wells under normal pumping rates is from induced stream infiltration.