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Sediment management concept Gail

Project Leader
Habersack Helmut, Project Leader
Duration:
01.09.2018-31.03.2023
Programme:
Amt der Kärntner Landesregierung - Beauftragung
Type of Research
Applied Research
Staff
BOKU Research Units
Institute of Institute of Hydraulic Engineering and River Research
Funded by
Amt der Kärntner Landesregierung, Arnulfplatz 1, 9020 Klagenfurt, Austria
Abstract
The Gail river its tributary rivers are strong bedload-carrying rivers, therefore a bedload retention place was installed 1907.
At the moment there are two main problems on the Gail. The first one is the region around the sediment deposition zone in Dellach in the Gail Valley. Until the year 2007 sediment was taken from the sediment deposition zone. In this area the riverbed is eroding by an average of 2 meters in a length of 10 kilometers.
The second one is the region between the Pressegger Lake and Nötsch. In this area in the last 40 years sediment was deposited on the river banks, the result was a reduction in the cross-section; which resulted in rising water levels. During a LIFE Project three 400 meters long model routes for testing the different solutions for minimizing the aggradation were implemented.
The issue of cavity in the sediment deposition zone and the aggradation between the Pressegger Lake and Nötsch are not enough explored yet. The sediment management concept of the Gail should lead to a better understanding of the processes in the Gail and to an identification and interpretation of the reasons for the existing sediment problems
For this fundamental data, like sediment input of the tributary rivers, hydrological data, continuity of sediment in check dams, grain-size distribution along the river Gail and hydromorphological data, will be analyzed and assessed. Therefore a sediment monitoring, including a tracer study, analysis of surface and subsurface layer from the river bed, direct and indirect measurements of the bedload transport will be realized.
The resulting bedload balancing should be the fundamental database for the management concept and should help to identify key areas for improvement measures.
Keywords
Erosion; Sedimentology; Hydrology; Structural hydraulic engineering;
erosion; sediment management concept; Bedload monitoring; sediments;
Publications

Habersack, H; Schwarz, S; Rindler, R; Unger, L; Gmeiner, Ph (2021): Feststoffmanagementkonzept Gail, Enbericht.

Finanziert von: Finanziert von: Bundesministerium für Landwirtschaft, Regionen und Tourismus, Land Kärnten , 136

Habersack, H; Schwarz, S; Rindler, R; Gmeiner Ph (2020): Feststoffmanagementkonzept Gail Zwischenbericht 2018/2019.

Bundesministerium für Landwirtschaft, Regionen und Tourismus, Land Kärnten

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