Abstract
The European Union’s Water Frame - work Directive aims to achieve a ‘good’ ecological status for groundwater bodies, for groundwater-dependent terrestrial ecosystems, and for aquatic surface water bodies by the year 2015. In Denmark, this goal will most likely not be fulfilled within such a short time frame due to the current poor ecological condition of Danish lakes (Søndergaard et al. 2008). However, public concern about the protection of aquatic environments has increased, and so has interest in improving lake water quality by reducing nutrient loading. Effective and sustainable lake restoration and conservation depend on the ability to (1) point out sensitive catchment areas for the lake, (2) estimate its total water and nutrient budgets and (3) relate observed differences in seepage rates to the abundance and distribution of macrophytes in the lake and to the topography and land-use of the surrounding terrain. In seepage lakes, i.e. lakes without inlets or outlets, the influence of the surrounding terrain, regional hydrogeology and lake geometry on the overall lake water budget has been studied in some detail (Krabbenhoft et al. 1990; Anderson & Cheng 1993; Cheng & Anderson, 1994; Kratz et al. 1997; Winter 1999; Townley & Trefry 2000). However, little efforthas been made to understand and quantify how riparian zones (wetlands) surrounding lakes may control the water flow and nutrient transport to the lakes. Although groundwater inflow to seepage lakes is suspected to be smaller than inflow from drainage ditches, it may still account for a significant nutrient influx.
Highlights
Work Directive aims to achieve a ‘good’ ecological status for groundwater bodies, for groundwater-dependent terrestrial ecosystems, and for aquatic surface water bodies by the year 2015
This paper focuses on field work carried out 2007 and 2008 at Skærsø, a lake in the upper part of the Kolding Å catchment area in south-east Jylland (Fig. 1A)
The project is conducted by the Centre for Lake Restoration, which includes participants from University of Southern Denmark, National Environmental Research Institute, University of Copenhagen and Geological Survey of Denmark and Greenland
Summary
A: Preliminary model of the water balance of Skærsø. B: Conceptual hydrogeological model of a perched lake disconnected from the underlying aquifer. Groundwater inflow to seepage lakes is suspected to be smaller than inflow from drainage ditches, it may still account for a significant nutrient influx. This paper focuses on field work carried out 2007 and 2008 at Skærsø, a lake in the upper part of the Kolding Å catchment area in south-east Jylland (Fig. 1A). Field studies at Skærsø have shown that seepage can vary on different scales in both space and time. The purpose of this study is to link measurements of lake seepage rates and lake precipitation or evaporation to the catchment hydrogeology. The project is conducted by the Centre for Lake Restoration, which includes participants from University of Southern Denmark, National Environmental Research Institute, University of Copenhagen and Geological Survey of Denmark and Greenland
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