Solute transport through the integrated groundwater‐stream system of a catchment
Solute transport through the integrated groundwater‐stream system of a catchment
复制标题
通过集水区综合地下水流系统的溶质运输
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Miller
中科院分区：
文献类型：
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作者：
G. Lindgren;G. Destouni;A. Miller
本文采用拉格朗日随机平流-吸附旅行时间方法，建立了集水区尺度溶质运移的地下水-河流耦合模型。我们考虑了整个流域的分布溶质输入，并根据可能的溶质扩散机制，研究了由此产生的溪流溶质突破：(1)流动和不流动地下水带之间的可变地下水平流和溶质质量传递；(2)流内平流、混合和溪流与潜流带之间的溶质质量传递。在这些机制中，我们发现分形溶质在较宽时间尺度范围内的扩散，对于现实参数值来说，只有在地下水中可变溶质平流和溶质传质同时存在的条件下，地下水平均平流与传质率之比在一定的值范围内，并且只有一小部分溶质输入质量随着陆地和/或风暴土壤水流进入溪流。
We present a coupled groundwater‐stream model of catchment‐scale solute transport, using a Lagrangian stochastic advective‐sorptive travel time approach. We consider distributed solute input over an entire catchment and investigate the resulting stream solute breakthrough, subject to the possible solute spreading mechanisms: (1) variable groundwater advection and solute mass transfer between mobile and immobile groundwater zones and (2) in‐stream advection, mixing, and solute mass transfer between stream water and hyporheic zone. Among these mechanisms we show that fractal solute spreading over a wide timescale range is, for realistic parameter values, obtained in the stream only for the condition combination of both variable solute advection and solute mass transfer in the groundwater, with mean groundwater advection to mass transfer rate ratio that falls within a certain value range and with only a small fraction of solute input mass following fast overland and/or storm soil water flow to the stream.