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Empirical Quantification of Lacustrine Groundwater Discharge – Different Methods and Their Limitations : Volume 365, Issue 365 (02/03/2015)

By Meinikmann, K.

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Book Id: WPLBN0003977043
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Empirical Quantification of Lacustrine Groundwater Discharge – Different Methods and Their Limitations : Volume 365, Issue 365 (02/03/2015)  
Author: Meinikmann, K.
Volume: Vol. 365, Issue 365
Language: English
Subject: Science, Proceedings, International
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Nützmann, G., Lewandowski, J., & Meinikmann, K. (2015). Empirical Quantification of Lacustrine Groundwater Discharge – Different Methods and Their Limitations : Volume 365, Issue 365 (02/03/2015). Retrieved from http://www.nationalpubliclibrary.info/


Description
Description: Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany. Groundwater discharge into lakes (lacustrine groundwater discharge, LGD) can be an important driver of lake eutrophication. Its quantification is difficult for several reasons, and thus often neglected in water and nutrient budgets of lakes. In the present case several methods were applied to determine the expansion of the subsurface catchment, to reveal areas of main LGD and to identify the variability of LGD intensity. Size and shape of the subsurface catchment served as a prerequisite in order to calculate long-term groundwater recharge and thus the overall amount of LGD. Isotopic composition of near-shore groundwater was investigated to validate the quality of catchment delineation in near-shore areas. Heat as a natural tracer for groundwater–surface water interactions was used to find spatial variations of LGD intensity. Via an analytical solution of the heat transport equation, LGD rates were calculated from temperature profiles of the lake bed. The method has some uncertainties, as can be found from the results of two measurement campaigns in different years. The present study reveals that a combination of several different methods is required for a reliable identification and quantification of LGD and groundwater-borne nutrient loads.

Summary
Empirical quantification of lacustrine groundwater discharge – different methods and their limitations

 

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