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<p>Understanding groundwater-surface water interaction is critical for both quantitative and qualitative estimation of exchange flux between these two water bodies. A comprehensive review of the literature identified the reach-scale approach addressing streambed and aquifer as relevant for GW-SW interaction and the catchment-scale approach considering only the aquifer properties. An analytical approach developed in this work, considering a 2D GW-SW system for a losing stream, bridges these two approaches. The model incorporates streambed conductance and aquifer transmissivity as governing factors and introduces a critical conductance value (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40899_2025_1192_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="28" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:CV\)</EquationSource> </InlineEquation>) to delineate streambed-dominated and aquifer-dominated scenarios in flux estimation. Furthermore, the study provides recommendations for head measurement locations based on stream width, aquifer transmissivity, and streambed conductivity. Narrow streams with low-permeability streambeds and highly transmissive aquifers require measurements near the stream edge, while wider streams necessitate measurements at larger distances. While the model effectively simplifies GW-SW flux quantification, it is limited to symmetric and losing stream configurations, suggesting opportunities for future extensions to gaining systems.</p>

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Analytical quantification of streambed and aquifer influence on exchange flux in fully connected losing streams

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • M. Tripathi,
  • A. C. Vinson,
  • P. K. Yadav,
  • B. R. Chahar,
  • P. Dietrich

摘要

Understanding groundwater-surface water interaction is critical for both quantitative and qualitative estimation of exchange flux between these two water bodies. A comprehensive review of the literature identified the reach-scale approach addressing streambed and aquifer as relevant for GW-SW interaction and the catchment-scale approach considering only the aquifer properties. An analytical approach developed in this work, considering a 2D GW-SW system for a losing stream, bridges these two approaches. The model incorporates streambed conductance and aquifer transmissivity as governing factors and introduces a critical conductance value ( \(\:CV\) ) to delineate streambed-dominated and aquifer-dominated scenarios in flux estimation. Furthermore, the study provides recommendations for head measurement locations based on stream width, aquifer transmissivity, and streambed conductivity. Narrow streams with low-permeability streambeds and highly transmissive aquifers require measurements near the stream edge, while wider streams necessitate measurements at larger distances. While the model effectively simplifies GW-SW flux quantification, it is limited to symmetric and losing stream configurations, suggesting opportunities for future extensions to gaining systems.