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Mapping spatial patterns of groundwater discharge in a deep lake using high-resolution temperature sensors

Title data

Keim, Catharina ; Mehler, Franziska ; Wolf, Thomas ; Gilfedder, Benjamin Silas:
Mapping spatial patterns of groundwater discharge in a deep lake using high-resolution temperature sensors.
In: Inland Waters. Vol. 9 (20 August 2019) Issue 3 . - pp. 334-344.
ISSN 2044-205X
DOI: https://doi.org/10.1080/20442041.2019.1609859

Project information

Project financing: Bundesministerium für Bildung und Forschung
BMBF Förderkennzeichen 02WRM1365B

Abstract in another language

Identifying groundwater discharge zones to lakes is important because the groundwater system can contribute a significant flux of water and solutes and potentially influence lake chemistry and ecology. We present a new instrument, Temperature Mapper (TM), to map groundwater discharge zones in lakes via temperature anomalies along the lake bottom, tested in Lake Constance at 2 former sand and gravel extraction sites. TM is essentially a 4 m wide sled with an array of 19 high-resolution sensors attached to an aluminum lattice towed along the lake bed behind a boat. It is able to map spatial temperature patterns representing groundwater discharge zones at a resolution of 20 cm laterally and 2.5 m in path direction. We conducted 2 field campaigns in February 2016 and February 2017, during which TM identified several temperature anomalies interpreted as groundwater discharging zones. Radon-222 was also analyzed at selected locations as an independent indicator of groundwater discharge. Overall, when comparing the different methods and different years, we observed similar spatial patterns of preferential groundwater discharge. TM offers a useful qualitative tool to identify and map potential groundwater discharge zones in lakes or coastal areas that can then be further studied by more quantitative, small-scale methods such as chemical tracers or seepage meters.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Groundwater discharge; Lake; 222Radon; Temperature; Tracer
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 10 Sep 2020 07:17
Last Modified: 10 Sep 2020 07:17
URI: https://eref.uni-bayreuth.de/id/eprint/56856