title: Assessing habitat exposure to eutrophication in restored wetlands: model-supported ex-ante approach to rewetting drained mires.
abstract: A multi-model-based study was performed in order to unravel valuable fen meadow habitats' possible exposure to eutrophication, which is expected to occur as a result of the re-saturation of degraded peat soils. The framework was tested in a 3000-ha fen-drain system to be restored in the Middle Biebrza Basin (northeast Poland), where the datasets and related models were used to delineate prospective eutrophication hotspots and nutrient transport. A 1-d hydrodynamic model and a 3-d groundwater flow model were applied to constitute the hydrological response of the fen-drain system to the prospective construction and function of weirs and spillways, which are expected to induce the increase of groundwater levels in degraded fens. A groundwater particle-tracking postprocessor was applied to delineate flow pathways and discharge zones and to determine water residence time in modelled layers. Soil and habitat maps, a high-resolution digital elevation model and historic groundwater level observations were applied to the model performance, calibration and spatial analysis of prospective eutrophication hotspots where increased eutrophication of groundwater can be expected due to the re-saturation of degraded peat soils. The study revealed that the large-scale fen rewetting that occurred as a result of surface water bodies' damming can potentially result in groundwater-driven nutrient dispersion along with an enhanced nutrient transport from a fen to the adjacent water bodies. Spatial analyses showed that, although the rewetting-driven eutrophication of Molinia fen meadows located in the study area is not likely, one can expect increased nutrient discharges to adjacent drains, inducing the contamination of ox-bow lakes located along the rivers. We propose the presented methodology to be applied ex-ante to fen-rewetting projects in strategic environmental assessments of restoration projects in order to manage the potentially negative environmental consequences of fen and river eutrophication with special regard to nutrient hotspots that are likely to occur within the rewetted fens.
authors: Department of Hydraulic Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, ul. Nowoursynowska 159, 02-776 Warsaw, Poland. Electronic address: m.grygoruk@levis.sggw.pl.
authors: Mateusz
authors: M
authors: Grygoruk
authors: Department of Hydraulic Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, ul. Nowoursynowska 159, 02-776 Warsaw, Poland.
authors: Agnieszka
authors: A
authors: Bańkowska
authors: Department of Plant Ecology and Environmental Conservation, Institute of Botany, Faculty of Biology, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw, Poland.
authors: Ewa
authors: E
authors: Jabłońska
authors: Department of Limnology and Biological Oceanography, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
authors: Georg A
authors: GA
authors: Janauer
authors: Department of Hydraulic Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, ul. Nowoursynowska 159, 02-776 Warsaw, Poland.
authors: Janusz
authors: J
authors: Kubrak
authors: Department of Hydraulic Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, ul. Nowoursynowska 159, 02-776 Warsaw, Poland.
authors: Dorota
authors: D
authors: Mirosław-Świątek
authors: Department of Plant Ecology and Environmental Conservation, Institute of Botany, Faculty of Biology, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw, Poland.
authors: Wiktor
authors: W
authors: Kotowski
mesh_terms: D003247:Conservation of Natural Resources; D017753:Ecosystem; D005068:Eutrophication; D060587:Groundwater / Q000737:chemistry; D062070:Hydrology; D008962:Models, Theoretical; D011446:Prospective Studies; D045483:Rivers / Q000737:chemistry; D053833:Wetlands
keywords: Biebrza; Environmental impact assessment; Eutrophication; Fen; Hydrology; Management; Modelling; Restoration; Wetlands