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<p>The prevailing hydraulic head differences at the Brandenburg lock lead to constant infiltration of river water into the shallow groundwater, comparable to conditions in bank filtration. The low flow velocities in the upper reach result in the deposition of fine sediments, which can locally lead to clogging layers. Continuous measurements of water levels and temperatures in the aquifer, along with repeated tracer experiments, were carried out to investigate whether partial removal of the clogging layer affected the surface water infiltration pattern, the groundwater levels, and the groundwater flow field.</p><p>The removal of several decimetres of clayey, silty sands did not result in substantial changes in groundwater levels or temperatures. Detailed analysis of the tracer experiments revealed local changes in the groundwater flow field. As a&#xa0;result of changes in surface water infiltration patterns, the groundwater flow paths were shortened and residence times in the aquifer were reduced by a&#xa0;factor of&#xa0;2.5.</p>

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Großflächige Tracerversuche zum Einfluss von Sohlbaggerungen auf Entwicklung des Grundwassereintrags

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月3日

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  • Matthias Munz,
  • Daniel Strasser,
  • Hermann-Josef Lensing,
  • Sascha E. Oswald

摘要

The prevailing hydraulic head differences at the Brandenburg lock lead to constant infiltration of river water into the shallow groundwater, comparable to conditions in bank filtration. The low flow velocities in the upper reach result in the deposition of fine sediments, which can locally lead to clogging layers. Continuous measurements of water levels and temperatures in the aquifer, along with repeated tracer experiments, were carried out to investigate whether partial removal of the clogging layer affected the surface water infiltration pattern, the groundwater levels, and the groundwater flow field.

The removal of several decimetres of clayey, silty sands did not result in substantial changes in groundwater levels or temperatures. Detailed analysis of the tracer experiments revealed local changes in the groundwater flow field. As a result of changes in surface water infiltration patterns, the groundwater flow paths were shortened and residence times in the aquifer were reduced by a factor of 2.5.