Baltic Coastal Zone

Journal of Ecology and Management of the Coastline

Vol. 17 pp. 21 - 34 2013

ISBN 1643-0115

©Copyright by Institute of Biology and Environmental Protection of the Pomeranian University in Słupsk

Original research paper

Received:

Accepted:

16 September 2013

25 February 2014

 

THE USE OF A GEOCHEMICAL METHOD IN THE DETECTIONOF GROUNDWATER DISCHARGE TO FLOODPLAIN LAKES 

Katarzyna Glińska-Lewczuk1*, Paweł Burandt1, Żaneta Banaszek1, Jarosław Chormański2, Małgorzata Słapińska2, Cristina Timofte1, Lech Serwotka1,Joanna Sawczyn3 & Natalia Jarząb3

1 Department of Land Reclamation and Environmental Management, Faculty of Environmental Management and Agriculture, University of Warmia and Mazury in Olsztyn, Plac Łódzki 2, 10-719 Olsztyn, Poland, kaga@uwm.edu.pl (*corresponding author)

2 Department of Water Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences – SGGW, ul. Nowoursynowska 166, 02-787 Warszawa, Poland

3 Department of Ecology, Institute of Biology and Environmental Protection, Pomeranian University in Słupsk, ul. Arciszewskiego 22, 76-200 Słupsk, Poland

Abstract

Water quality parameters of floodplain lakes may be indicative of the intensity of groundwater recharge. The main assumption made in the study is that the direct influence of groundwater recharge is reflected in the vertical gradient of temperature and aeration along the whole water column. Considering this, we seasonally monitored physical and chemical properties of 22 oxbow lakes in postglacial river valleys (the Słupia, Drwęca and Łyna rivers) in temperate climate zone in the southern watershed of the Baltic Sea (N Poland). The results were compared with groundwater samples from transects of piezometers located near the floodplain lakes. The floodplain water bodies showed variability (both in vertical and spatial dimensions) in temperature, aeration and electrolytic conductivity, affected mainly by different sources of water supply. The temperatures and dissolved oxygen contents declined not only with the increasing depth of water and a distance from the river channel, but also a significant drop in the parameters’ values have been associated with groundwater recharge within the floodplain edge.

Key words: oxbow lake, groundwater, hydrological connectivity, thermal gradient, aeration