Restoring river-floodplain interconnection and riparian habitats along the embanked Danube between Neuburg and Ingolstadt (Germany)
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1 Restoring river-floodplain interconnection and riparian habitats along the embanked Danube between Neuburg and Ingolstadt (Germany) Dipl.-Geogr. Gerald Blasch Department of Physical Geography, Cath. University Eichstätt / Floodplain Institute Neuburg/Danube Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
2 Project area Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
3 Historical background Since 1970 barrages of Bergheim and Ingolstadt Since 1830 embankment and straightening measurements Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
4 Status quo ha high biodiversity (habitats and species) FFH-/SPA-area Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
5 softwood riparian forest calcareous grasslands ruderal habitats hardwood riparian forest Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
6 Status quo No river continuity No water and soil dynamics in the floodplain, no connection between river and floodplain (except from flooding > m 3 /s) Partly high groundwater level Change of vegetation from typical riparian and floodplain species to terrestrial or wetland species Lost of dynamic ruderal habitats (ox-bows, gravel banks, undercut slopes ) Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
7 Former dynamics still readable Laser DTM, resolution 2 m Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
8 The project Idea Hydrological process is key process for: morphological dynamics and water dynamics therefore it is a precondition for vegetation and fauna Aim Bring back dynamics to the floodplain and Reconnect floodplain and river In charge Water-Management Authority Ingolstadt Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
9 The project: Bypass Bergheim barrage Bergheim barrage Effects river continuity hydromorphological dynamics new riparian and aquatic habitats improved groundwater dynamics Return flow weir Return flow weir Technical data permanent flow of m 3 /s total length 9 km new water course or temporary water bodies Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
10 The project: Bypass Bergheim barrage Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
11 The project: ecological flooding Bergheim barrage Effects more frequent floods adjusted to the Danube improved groundwater dynamics restoration of floodplain habitat relicts development of new floodplain habitats Weir Technical data runoff up to 30 m 3 /s during peak discharge of the Danube ( m 3 /s) 2 or 3 times a year, duration 5-10 days main flowing of water is along the bypass, return at different sites man-controlled Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
12 Natural floods: Danube more than m 3 /s Weir man-controlled flooding Bypass weir Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
13 New dynamics Natural flood Man-controlled flooding (up to 30 m 3 /s) Bypass permant water course (ca. 2-5 m 3 /s) Danube Dam Ox-bow Ox-bow Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
14 The project: temporary drainage Bergheim barrage Effects temporary drawdown of permanent high groundwater level the adequate water level is part of the research program restoration of floodplain habitats instead of wetland habitats Technical data new drainage channel in the water storage area of Ingolstadt two locks of the return courses of the new river, sluice in the dike man-controlled, during low water level of the Danube Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
15 Floodplain Institute Neuburg/Danube Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
16 Task Force Monitoring of floodplain-ecological processes Cath. University Eichstätt-Ingolstadt Component II: Fluvial morphodynamic, Soil moisture and Groundwater Technical University München / Bavarian Academy of Forestry Component V: Tree species development and Vitality University Weihenstephan-Triesdorf Component III: Monitoring of Vegetation University Osnabrück Component IV: Transformation of water and riparian vegetation Cath. University Eichstätt-Ingolstadt / Floodplain Institut Neuburg Component I: Projetc management Technical University München Comonent VI: Survey and Monitoring of floodplain fauna University Weihenstephan-Triesdorf / Cath. University Eichstätt-Ingolstadt Component VII: Biodiversity and environmental education Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
17 Thank you for your attention! Gerald Blasch Danube Parks - Task Force Meeting Bratislava, 27th 28th January
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