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J Environ Manage. 2017 Nov 1;202(Pt 2):337-347. doi: 10.1016/j.jenvman.2017.01.020. Epub 2017 Jan 20.

An environmental assessment of water replenishment to a floodplain lake.

Author information

1
Institute of Geography, University of Pécs, Ifjúság útja 6, H-7624 Pécs, Hungary. Electronic address: loczyd@gamma.ttk.pte.hu.
2
Institute of Geography, University of Pécs, Ifjúság útja 6, H-7624 Pécs, Hungary.

Abstract

There are numerous wetland rehabilitation projects worldwide, but their efficiency is seldom assessed comprehensively. Oxbow lakes are wetlands of particular sensitivity. Within a large-scale floodplain rehabilitation project in Hungary, the Old Drava Programme, water replenishment was first carried out for the Cún-Szaporca oxbow lakes, a key area in the project. To assess its sustainability, the entire hydrological system has been monitored. From the data of hydrological monitoring (infiltration, soil moisture, groundwater/lakewater interaction) it is claimed that water replenishment involves significant losses through seepage (4.1 and 1.46 mm d-1) and evaporation (3.01 and 1.44 mm d-1) in the studied pre-intervention and replenishment periods, resp. Infiltration alone is insufficient to replenish groundwater and raise oxbow lake levels. In the critical summer half-year evaporation is intensive in the neighbouring agricultural fields. Groundwater table dynamics are controlled by hyporheic and groundwater flow. Major impact on the water balance of the oxbow lakes is exerted by the regime of the Drava River. A deepened lakebed is recommended to ensure more effective water retention in the oxbow lake. From the local study conclusions are drawn for the feasibility of rehabilitation at floodplain scale and in areas with similar hydromorphological conditions.

KEYWORDS:

Groundwater dynamics; Groundwater/surface water interaction; Hyporheic flow; Oxbow lake; Water losses

PMID:
28117113
DOI:
10.1016/j.jenvman.2017.01.020
[Indexed for MEDLINE]

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