Groundwater response to serial stream stage fluctuations in shallow unconfined alluvial aquifers along a regulated stream (West Virginia, USA)
Groundwater response to serial stream stage fluctuations in shallow unconfined alluvial aquifers along a regulated stream (West Virginia, USA)
复制标题
地下水对沿调节河流的浅层无承压冲积含水层连续水位波动的响应（美国西弗吉尼亚州）
DOI：
10.1007/s10040-016-1443-6
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发表时间：
2016
影响因子：
2.8
通讯作者：
J. Donovan
中科院分区：
文献类型：
--
作者：
Madan Maharjan;J. Donovan
地下水响应流水位波动进行了研究，在两个无压冲积含水层使用长达一年的时间序列流阶段从两个池沿着在美国西弗吉尼亚州的调节流。其目的是分析空间和时间变化的地下水/地表水相互作用，并估计诱导入渗率和累积银行存储在一年周期的河流水位波动。卷积积分法被用来模拟水位波动引起的不同距离的河流的含水层水头，并估计通过河流-含水层边界的通量。含水层扩散率估计的摆动匹配时间和振幅的模拟响应多个观测到的风暴事件。观测到的溪流和含水层水位峰值之间的峰值滞后时间为14至95小时。瞬态模拟扩散率范围为1，000至7，500 m2/天，与实测和计算的单峰阶段比扩散率偏离14- 82%。河流水位波动对地下水位的控制作用大于补给作用，特别是在丰水期。大坝的运行局部地改变了地下水的流动路径和速度。蓄水池上游的含水层更容易受到地表水的控制，水位波动比下游更明显。该方法可作为污染调查或井场管理相关的诱导入渗率和河岸蓄水量的快速评估的有用工具。
Groundwater response to stream stage fluctuations was studied in two unconfined alluvial aquifers using a year-long time series of stream stages from two pools along a regulated stream in West Virginia, USA. The purpose was to analyze spatial and temporal variations in groundwater/surface-water interaction and to estimate induced infiltration rate and cumulative bank storage during an annual cycle of stream stage fluctuation. A convolution-integral method was used to simulate aquifer head at different distances from the stream caused by stream stage fluctuations and to estimate fluxes across the stream-aquifer boundary. Aquifer diffusivities were estimated by wiggle-matching time and amplitude of modeled response to multiple observed storm events. The peak lag time between observed stream and aquifer stage peaks ranged between 14 and 95 hour. Transient modeled diffusivity ranged from 1,000 to 7,500 m2/day and deviated from the measured and calculated single-peak stage-ratio diffusivity by 14-82%. Stream stage fluctuation displayed more primary control over groundwater levels than recharge, especially during high-flow periods. Dam operations locally altered groundwater flow paths and velocity. The aquifer is more prone to surface-water control in the upper reaches of the pools where stream stage fluctuations are more pronounced than in the lower reaches. This method could be a useful tool for quick assessment of induced infiltration rate and bank storage related to contamination investigations or well-field management.