Snowmelt‐induced diel fluxes through the hyporheic zone
Snowmelt‐induced diel fluxes through the hyporheic zone
复制标题
融雪引起的流经潜流带的昼夜通量
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Lundquist
中科院分区：
文献类型：
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作者：
S. Loheide;J. Lundquist
融雪过程导致径流和流阶段的昼夜波动，传播到河岸含水层，并导致每天抽水的潜流区。在加州约塞米蒂国家公园的Tuolumne Meadows收集的河流水位和地下水位记录中观察到了这种昼夜抽水。利用傅里叶分析开发了一个模型来表示水位波动和地下水流的一维线性化Boussinesq方程的解。模拟表明，每天都有大量的水通过这一过程泵入和泵出含水层。此外，由于融雪引起的地下水波动在远离河流的距离处表现出振幅减小和时滞增加，因此该模型可用于估计河岸含水层的水力参数。融雪引起的潜流抽水可能对潜流区的生态地球化学过程产生影响，并可能提供与水过滤，热缓冲，营养循环和水质相关的重要生态系统服务。应考虑认识、量化和监测融雪引起的潜流带抽水及其提供的生态系统服务，因为气候和土地利用变化可能会改变未来这一过程的规模。
Snowmelt processes result in diel fluctuations in streamflow and stream stage that propagate into riparian aquifers and cause a daily pumping of the hyporheic zone. This diel pumping was observed in stream stage and water table records collected in Tuolumne Meadows, Yosemite National Park, California. A model was developed using Fourier analysis to represent the stream stage fluctuations and a solution to the 1‐D, linearized Boussinesq equation for groundwater flow. The modeling demonstrates that a substantial volume of water is pumped in and out of the aquifer via this process on a daily basis. In addition, since the snowmelt‐induced groundwater fluctuations exhibit both reduced amplitudes and increased time lags at distances away from the stream, the model can be used to estimate the hydraulic parameters of the riparian aquifer. Snowmelt‐induced hyporheic pumping may have implications for biogeochemical processes in the hyporheic zone and may provide important ecosystem services related to water filtration, thermal buffering, nutrient cycling, and water quality. Consideration should be given to recognizing, quantifying, and monitoring snowmelt‐induced pumping of the hyporheic zone and the ecosystem services it provides since climate and land use changes may alter the magnitude of this process in the future.