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Mario Klösch (University of Natural Resources and Life Sciences, Vienna) Frédéric Liébault (Irstea Grenoble)

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Mario Klösch (University of Natural Resources and Life Sciences, Vienna) Frédéric Liébault (Irstea Grenoble) www.alpine-space.eu/hymocares www.facebook.com/HyMoCARES Interreg Alpine Space Project HyMoCARES HydroMorphological assessment and management at basin scale for the Conservation of Alpine Rivers and related Ecosystem Services Results and highlights – HyMoCARES selection of tools for river managers Presented by: Mario Klösch (University of Natural Resources and Life Sciences, Vienna) Frédéric Liébault (Irstea Grenoble) HyMoCARES Final conference Bolzano-Bozen, October 2, 2019 Presentation content • Introduction • Multi-scale framework for hydromorphological management • Tools supporting hydromorphological restoration Bolzano, October 2nd, 2019 Presentation content • Introduction • Multi-scale framework for hydromorphological management • Tools supporting hydromorphological restoration Bolzano, October 2nd, 2019 Pressures at the HyMoCARES case study sites Bolzano, October 2nd, 2019 Retention of sediment in the catchment Hydropower plants in the Mura River catchment © google earth Hydropower plant Obervogau (Mura) and Retznei (Sulm) – Styria Torrent control (Eggenbach - Wagner et al. (2015) Carinthia) Bolzano, October 2nd, 2019 Channelisation (narrowing and straightening) of river reaches Example: Mura River along the border between Slovenia and Austria 1821-1836 2km Bolzano, October 2nd, 2019 Channelisation (narrowing and straightening) of river reaches Example: Mura River along the border between Slovenia and Austria 18212006-1836 © google earth 2km Bolzano, October 2nd, 2019 Presentation content • Introduction • Multi-scale framework for hydromorphological management • Tools supporting hydromorphological restoration Bolzano, October 2nd, 2019 Multi-scale framework for hydromorphological assessment Basic considerations: 1. Sediment supply determines lateral dynamics 2. Sediment supply determines channel slope 3. Bed level changes alter sediment transport Bolzano, October 2nd, 2019 Einleitung 1. Sediment supply determines lateral dynamics The lateral dynamics increase with increasing sediment supply Schumm (1985) Church (2006) Bolzano, October 2nd, 2019 2. Sediment supply determines channel slope The channel slope adjusts to the supply via aggradation/degradation increased supply initial supply decreased supply Bolzano, October 2nd, 2019 3. Bed level changes alter sediment transport Aggradation increases, degradation decreases sediment transport Aggradation Degradation Qs Qs Qs,in Qs,out Qs,out Qs,in Bolzano, October 2nd, 2019 Einleitung Qs,in wide narrow CATCHMENT SCALE CATCHMENT CATCHMENT SCALE CATCHMENT Qs,in Qs,out REACH SCALE REACH SCALE Qs,out Bolzano, October 2nd, 2019 Einleitung Qs,in aggradation degradation CATCHMENT SCALE CATCHMENT CATCHMENT SCALE CATCHMENT Qs,in Qs,out REACH SCALE REACH SCALE Qs,out Bolzano, October 2nd, 2019 Einleitung Qs,in aggradation wide narrow degradation CATCHMENT SCALE CATCHMENT CATCHMENT SCALE CATCHMENT Qs,in Qs,out REACH SCALE REACH SCALE Qs,out Bolzano, October 2nd, 2019 Example: Eruption of Mount St. Helens in 1980: Einleitung Instantaneous increase of sediment supply Qs,in aggradation wider conditions Increase of channel width of boundary Sudden change CATCHMENT SCALE CATCHMENT narrower degradation Qs,out Legend REACH SCALE Increased slope Initial slope and bed composition Decreased slope and/or bed armouring Zheng et al. (2014) Bolzano, October 2nd, 2019 Example: Eruption of Mount St. Helens in 1980: Einleitung Instantaneous increase of sediment supply Qs,in aggradation wider Longer term adjustment Increase of channel widthslope CATCHMENT SCALE CATCHMENT narrower degradation Qs,out Legend REACH SCALE Increased slope Initial slope and bed composition Decreased slope and/or bed armouring Zheng et al. (2014) Bolzano, October 2nd, 2019 Einleitung Example: Decrease of sediment supply in laboratory experiment Qs,in aggradation wider conditions of boundary CATCHMENT SCALE CATCHMENT Marti & Bezzola (2009) narrower Sudden change degradation Equilibrium after bedload supply was reduced to 20%: • Single channel with decreased width Qs,out • Armoured bed in single channel Legend REACH SCALE • Decreased slope (from 2.12% to 1.92%) Increased slope Initial slope and bed composition Decreased slope and/or bed armouring Bolzano, October 2nd, 2019 Einleitung Example: Decrease of sediment supply in laboratory experiment Qs,in aggradation wider Adjustment CATCHMENT SCALE CATCHMENT Marti & Bezzola (2009) narrower degradation Equilibrium after bedload supply was reduced to 20%: • Single channel with decreased width Qs,out • Armoured bed in single channel Legend REACH SCALE • Decreased slope (from 2.12% to 1.92%) Increased slope Initial slope and bed composition Decreased slope and/or bed armouring Bolzano, October 2nd, 2019 Einleitung Understand the trajectories of channel evolution of your river Example: Upper Drau (Austria) a) Channelisation b) Adjustment to the decreased channel width by decreasing slope and/or bed coarsening. c) Construction of dams in the catchment. d) Channel widening (including excavation of side- e channels) a e) Replacement of a check dam a new one with increased 0 2 1 5 b permeability the still reduced sediment supply d 4 3 c Legend Increased slope Initial slope and bed composition © Carinthian Water Management Authority Decreased slope and/or bed armouring Bolzano, October 2nd, 2019 Indicator of channel evolution: HyMoCARES Chevo Tool for standardised assessment of channel evolution Bolzano, October 2nd, 2019 Einleitung Indicator of channel evolution: HyMoCARES Chevo Tool for standardised assessment of channel evolution Example: Case study site Salzach River Measure: Initiation of bank erosion Cross sectional change: downstream of new ramp to compensate bedload deficit 399 398 2005 xs 504 397 2015 xs 504 396 395 394 393 elevation (m elevation a.s.l.) 392 391 390 -20 0 20 40 60 80 100 120 140 160 lateral distance (m) Bolzano, October 2nd, 2019 Displayed all at once: The channel evolution diagram Presentation content • Introduction • Multi-scale framework for hydromorphological management • Tools supporting hydromorphological restoration Bolzano, October 2nd, 2019 Planning and Management Tools • Collection of recommended, existing tools; • New developments within HyMoCARES suitability - no x little xx medium xxx high HyMoCARES HyMoCARES Widest HyMoCARES SedRace HyMoLink HyMoCARES bedloadWeb Bolzano, October 2nd, 2019 Bolzano, October 2nd, 2019 HyMoCARES HyMoLink Tool for linking morphodynamics to habitat zones Hydraulic rating model for analysing morphodynamics with different relevance for aquatic and terrestrial habitats Based on frequency of submergence, the river is subdivided into: • Aquatic zone • Semiterrestrial zone • Terrestrial zone Morphodynamics in different zones have different relevance in providing habitats to riverine species. Bolzano, October 2nd, 2019 HyMoCARES HyMoLink Tool for linking morphodynamics to habitat zones Bolzano, October 2nd, 2019 Frequency diagram HyMoCARES HyMoLink Tool for linking morphodynamics to habitat zones Cross section display Frequency diagram Semiterrestrial Semiterrestrial HyMoCARES HyMoLink erosion aggradation Tool for linking morphodynamics to habitat zones Aquatic Aquatic erosion aggradation Cross section display HyMoCARES HyMoLink Report on morphodynamics in aquatic, semiterrestrial and terrestrial zone Bolzano, October 2nd, 2019 BedloadWeb, a web site dedicated to bedload transport The aim is to provide standard concepts and tools for the largest audience (specialists and non-specialists) Home page Bolzano, October 2nd, 2019 BedloadWeb, a web site dedicated to bedload transport The first tab makes available more than 11000 bedload values measured in the field or in the flume, as well as standard bedload equations. This tool is educational as it permits to play with the models and to test their sensitivity to input parameters The database page Bolzano, October 2nd, 2019 BedloadWeb, a web site dedicated to bedload transport The second tab offers all the necessary tools for a complet bedload project (Grain size, Hydraulics Sediment budget..) The project management tool allows users to communicate with each other The toolbox page BedloadWeb, a web site dedicated to bedload transport The last page gives access to help and several documents Help page Bolzano, October 2nd, 2019 HyMoCARES SedRace Tool for estimating the velocity of sediment transfer to target reaches Aims: • Calculation of residence time of replenished sediment in sections • Time lag between upstream measures and downstream effects Replenishment at the Mur River Text; color: 0/51/153; © Styrian Water Management Authority HyMoCARES SedRace Tool for estimating the velocity of sediment transfer to target reaches Aims: • Calculation of residence time of replenished sediment in sections • Time lag between upstream measures and downstream effects © google earth © google earth © google earth Replenishment site Widened reach Bolzano, October 2nd, 2019 © Styrian Water Management Authority HyMoCARES SedRace Tool for estimating the velocity of sediment transfer to target reaches Method of tool development: Derivation of formulas from the field (based on Klösch and Habersack, 2018) . = 0.21 0.021 3 −0 485 2 3 63 50 − − − 50 Tracer survey at Drau River Bolzano, October 2nd, 2019 HyMoCARES SedRace Tool for estimating the velocity of sediment transfer to target reaches Application of the online tool to calculation residence times of sediment in target reaches or time until target is reached 350 200 0.008 ) 1 - ) 300 discharge (m3/s) 0.007 1 - 180 s 0.006 3 250 transport
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