Transient analysis of fluctuations of electrical conductivity as tracer in the stream bed
Transient analysis of fluctuations of electrical conductivity as tracer in the stream bed
复制标题
作为河床示踪剂的电导率波动的瞬态分析
DOI：
10.5194/hess-16-3689-2012
复制
发表时间：
2012
影响因子：
6.3
通讯作者：
J. Fleckenstein
中科院分区：
文献类型：
--
作者：
C. Schmidt;A. Musolff;N. Trauth;M. Vieweg;J. Fleckenstein
河床水通量的空间分布受水力传导系数、床型水头梯度和与邻近地下水系统的连通性的控制。水通量随着时间的推移而变化，受短期洪水事件或河流流量和地下水位季节性变化的影响。电导率（EC）的变化被用作天然示踪剂，以检测瞬态旅行时间和流速在流中砾石坝。我们提出了一种方法来估计旅行时间之间的流和测量位置的砾石坝通过非线性匹配的EC信号在时域中。获得最佳匹配所需的时间失真量与信号的传播时间有关。我们的分析表明，旅行时间增加，在较高的流量，因为横向头梯度横跨砾石坝变得显着较小的时间。
Spatial patterns of water flux in the stream bed are controlled by the distribution of hydraulic conductivity, bedform-induced head gradients and the connectivity to the adjoining groundwater system. The water fluxes vary over time driven by short-term flood events or seasonal variations in stream flow and groundwater level. Variations of electrical conductivity (EC) are used as a natural tracer to detect transient travel times and flow velocities in an in-stream gravel bar. We present a method to estimate travel times between the stream and measuring locations in the gravel bar by non-linearly matching the EC signals in the time domain. The amount of temporal distortion required to obtain the optimal matching is related to the travel time of the signal. Our analysis revealed that the travel times increase at higher stream flows because lateral head gradients across the gravel bar become significantly smaller at the time.
影响因子：
7
作者：
S. Boker;Minquan Xu;Jennifer L. Rotondo;Kadijah King
通讯作者：
S. Boker;Minquan Xu;Jennifer L. Rotondo;Kadijah King