Sediment management plans for the Dutch Rhine branches. Arjan Sieben Rijkswaterstaat Waterdienst
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1 zurück zum Inhaltsverzeichnis zur Kurzfassung Sediment management plans for the Dutch Rhine branches Arjan Sieben Waterdienst 8 oktober 2009
2 What happens downstream Lobith? Plans and trends Daily practice of fairway management Projects, and how they interfere with fairway management no regret and economic predictability of navigability lyfe-cycle approach sustainability Cooperation and exchange (users do, we should) 2 Management of fairway profiles 8 oktober 2009
3 What happens downstream Lobith? projects construction fixed layer outer bank sand mining Nijmegen assigned dredging (OLR-2,5m) Erleco m St.Andries dredging&dumping Fixed layer Bovenrijn contract dredging (OLR-2,5m) nourishment Bovenrijn contract dredging (OLR-2,8m; 150 m) contract dredg. OLR-2,8m;170m WFD bank projects Room for the River groyne lowering Waal, Pan.Kan. Delta Program? 3 Management of fairway profiles 8 oktober 2009
4 What happens downstream Lobith? trends Management of fairway profiles 8 oktober 2009
5 What happens downstream Lobith? trends bed level [m]+nap rivierkilometer average bed level [m] relative to Bovenrijn BovenWaal MiddenWaal BenedenWaal 5 Management of fairway profiles 8 oktober 2009
6 average bed level [m] relative to Bovenrijn BovenWaal MiddenWaal 955 BenedenWaal Rivierkilometer What happens downstream Lobith? trends St. Andries Waal 945 Nijmegen Erlecom Bovenrijn Pan. Kop 915 rivierkilometer 6 Management of fairway profiles 8 oktober Lobith 905 Emmerich 895 Niederrhein gemeten in 1960 gemeten in 1985 gemeten in 2000 prognose voor 2030 prognose voor 2060 prognose voor ,5 bed level [m]+nap 800 0,0-0,5-1,0-1,5-2,0-2,5 bodemverandering [m] tov 1934
![average bed level [m] relative to 1950 1830 1888 0.2 1872 1890 0 1950 1960 1970 1980 1990 2000 2010-0.2-0.03-0.4-0.6-0.8-1 -1.2-1.](/docs-images/93/113564164/images/7-3.jpg "4 Bovenrijn BovenWaal MiddenWaal 955 BenedenWaal 1950-1960 1960-1970 1970-1980 1980-1990 1990-2000 2000-2007 Rivierkilometer What happens downstream Lobith? trends St.")
7 average bed level [m] relative to Bovenrijn BovenWaal MiddenWaal 955 BenedenWaal Rivierkilometer What happens downstream Lobith? trends St. Andries Waal 945 Nijmegen potential bed level changes [m/a] at km 865 based on upstream observations 7 Management of fairway profiles 8 oktober record of (with feeding) 0.01 rivierkilometer , Erlecom Bovenrijn Pan. Kop Lobith Niederrhein 820 record of (without feeding) record of (with feeding) Emmerich gemeten in 1960 gemeten in 1985 gemeten in 2000 prognose voor 2030 prognose voor 2060 prognose voor ,5 bed level [m]+nap 800 0,0-0,5-1,5-2,0-2,5 bodemverandering [m] tov 1934
![plough (Pflug) Sediment Management & Fairway Maintenance ed forms over a point bar 3.0 1999 2000 2001 2002 2003 2004 2005 2006 2.5 2.0 1.5 dune height [m] shallow 1.](/docs-images/93/113564164/images/8-3.jpg "0inner bend kilometer 0.5 0.0 955 945 935 925 915 905 895 885 875 865 855 31% 32% assigned dredgig 8 Management of fairway profiles 8 oktober 2009")
8 plough (Pflug) Sediment Management & Fairway Maintenance ed forms over a point bar dune height [m] shallow 1.0inner bend kilometer % 32% assigned dredgig 8 Management of fairway profiles 8 oktober 2009
9 plough (Pflug) Sediment Management & Fairway Maintenance ed forms over a point bar dune height [m] shallow 1.0inner bend kilometer % 32% 9 Management of fairway profiles 8 oktober 2009
10 plough (Pflug) Sediment Management & Fairway Maintenance ed forms over a point bar minimum depth [cm] observed OLR-2,5 m ( ) 2.5 OLR-2,8m ( ) kilometer Rhine discharge [m3/s] 31% dune height [m] shallow 1.0inner bend 32% contract dredging (OLR-2,5m) 10 Management of fairway profiles 8 oktober 2009
11 plough (Pflug) Sediment Management & Fairway Maintenance ed forms over a point bar jaarlijks beunvolume [m3] minimum depth [cm] observed 32% assigned dredging OLR-2,5 m ( ) 2.5 OLR-2,8m ( ) kilometer Bovenrijn km Rhine discharge [m3/s] BovenWaal km % MiddenWaal km BenedenWaal km totaal contract dredging contract dredging (OLR-2,5m) (OLR-2,8m) dune height [m] shallow 1.0inner bend Management of fairway profiles 8 oktober 2009
12 Impact of projects on fairway maintenance (40 years bed level changes, dredge&dump strategies) Ruimte voor de Rivier project Delft3D model available and applied Delft3D model available end of years simulation, 80 km length; four days modelling&computing 12 Management of fairway profiles 8 oktober 2009
13 Impact of projects on fairway maintenance (40 years bed level changes, dredge&dump strategies) Ruimte voor de Rivier project Delft3D model available and applied Delft3D model available end of years simulation, 80 km length; four days modelling&computing 13 Management of fairway profiles 8 oktober 2009
14 Flood plain lowering near nautical bottle neck at least 2,8 m depth & 4 m width-averaged (95% of the year) with 5 days of dredging per 15 km at maximum Present situation Shallow fairway Planned excavation Predicted sedimentation Dredging of bottle neck = no regret (wait and see ) If dumping is optimized, downstream shallows can reduce as well 14 Management of fairway profiles 8 oktober 2009
15 Lowering of groynes over 85 km Crest from OLR+3,0 m to OLR+1,2 m Sedimentation and maintenance in the fairway? (2D model) Expert judgement Do banks erode? Do bed levels in groyne fields change? 15 Management of fairway profiles 8 oktober 2009
16 Lowering of groynes over 85 km Crest from OLR+3,0 m to OLR+1,2 m Sedimentation and maintenance in the fairway? (2D model) Expert judgement Do banks erode? Do bed levels in groyne fields change? 16 Management of fairway profiles 8 oktober 2009
17 Lowering of groynes over 85 km Crest from OLR+3,0 m to OLR+1,2 m Sedimentation and maintenance in the fairway? (2D model) Expert judgement Do banks erode? Do bed levels in groyne fields change? 0,2-0,3 m sedimentation (redistribution) raise of OLR (less maintenance) potential & temporal supply from groyne fields 17 Management of fairway profiles 8 oktober 2009
18 learning by doing, 10 km pilot Monitoring (> 1 year) of 10 km-scale bed levels (multibeam echosounding) maintenance (contractor) bank (laser-altimetry by plane) recovery of vegetation 4 selected groynes water levels (waves and hydrograph) velocities (high and low flow) August Management of fairway profiles 8 oktober 2009
19 Water Framework Directive ( ) Low-velocity zones of water, Sheltered from ship waves Sand bed, sand banks For spawning, resting and young fish Partial closure of groyne fields Removal bank protection Lowering of bank zones siltation ship waves pp p j Fixed layer bank Nijmegen Erlecom St.Andries Bovenrijn projects nourishment Bovenrijn Delta Program WFD construction fixed layer outer bank sand mining assigned dredging (OLR-2,5m) dredging&dumping Room for the River groyne lowering Waal, Pan.Kan. contract contract dredging dredging (OLR-2,8m; 150 m) (OLR-2,5m) Management of fairway profiles 8 oktober 2009
20 Combination of nature, flood capacity and fairway maintenance Costs. 80 m 30 m 260 m 170 m maximum Alternative for Room for the River & Water Framework Directive (decision 2011) on average larger depth, some sedimentation near entrance (optimization design & after construction..) 20 Management of fairway profiles 8 oktober 2009
21 Combination of nature, flood capacity and fairway maintenance Costs. 80 m 30 m 260 m 170 m maximum Alternative for Room for the River & Water Framework Directive (decision 2011) on average larger depth, some sedimentation near entrance (optimization design & after construction..) 21 Management of fairway profiles 8 oktober 2009
22 Dynamic banks, sheltered zone and parallel dam to compensate for effect on fairway Costs. 80 m 30 m 260 m 170 m maximum Alternative for Room for the River & Water Framework Directive (decision 2011) on average larger depth, some sedimentation near entrance (optimization design & after construction..) 22 Management of fairway profiles 8 oktober 2009
23 Niederrhein (Emmerich), river axis km 854 GLW & OLR 2002 bed level (2002) 9 6 Die Qual den Waal 3 0 [m]+nap Management of fairway profiles 8 oktober 2009
24 Niederrhein (Emmerich), river axis km 854 Niederrhein (Spyck), river axis km 857 GLW & OLR 2002 bed level (2002) 9 6 Die Qual den Waal 3 0 [m]+nap Management of fairway profiles 8 oktober 2009
25 Niederrhein (Emmerich), river axis km 854 Niederrhein (Spyck), river axis km 857 Bovenrijn (Tolkamer) river axis km 862 GLW & OLR 2002 bed level (2002) 9 6 Die Qual den Waal 3 0 [m]+nap Management of fairway profiles 8 oktober 2009
26 Niederrhein (Emmerich), river axis km 854 Niederrhein (Spyck), river axis km 857 Bovenrijn (Tolkamer) river axis km 862 Waal (Nijmegen), river axis km 880 GLW & OLR 2002 bed level (2002) 9 6 Die Qual den Waal 3 0 [m]+nap Management of fairway profiles 8 oktober 2009
27 Niederrhein (Emmerich), river axis km 854 Niederrhein (Spyck), river axis km 857 Bovenrijn (Tolkamer) river axis km 862 Waal (Nijmegen), river axis km 880 Waal (Zaltbommel) river axis km 929 GLW & OLR 2002 bed level (2002) 9 6 Die Qual den Waal 3 0 [m]+nap Management of fairway profiles 8 oktober 2009
28 pilot feeding Bovenrijn (2009) appr m 3 every 2 nd year 0,3 m x 150 m between km outer bend, left of axis lower than OLR-3,5 m composition conform bed (&sand) sediment feeding fixed layer Fairway maintenance and bifurcation Pannerdensche Kop??? monitoring water and bed levels velocities m 3 granite tracer (Medusa) bed sampling backscattermethod (TU Delft) 28 Management of fairway profiles 8 oktober 2009
29 pilot feeding Bovenrijn (2009) appr m 3 every 2 nd year 0,3 m x 150 m between km outer bend, left of axis lower than OLR-3,5 m composition conform bed (&sand) sediment feeding fixed layer Fairway maintenance and bifurcation Pannerdensche Kop??? monitoring water and bed levels velocities m 3 granite tracer (Medusa) bed sampling backscattermethod (TU Delft) 29 Management of fairway profiles 8 oktober 2009
30 pilot feeding Bovenrijn (2009) appr m 3 every 2 nd year 0,3 m x 150 m between km outer bend, left of axis lower than OLR-3,5 m composition conform bed (&sand) sediment feeding fixed layer Fairway maintenance and bifurcation Pannerdensche Kop??? monitoring water and bed levels velocities m 3 granite tracer (Medusa) bed sampling backscattermethod (TU Delft) 30 Management of fairway profiles 8 oktober 2009
31 pilot feeding Bovenrijn (2009) appr m 3 every 2 nd year 0,3 m x 150 m between km outer bend, left of axis lower than OLR-3,5 m composition conform bed (&sand) sediment feeding fixed layer Fairway maintenance and bifurcation Pannerdensche Kop??? monitoring water and bed levels velocities m 3 granite tracer (Medusa) bed sampling backscattermethod (TU Delft) 31 Management of fairway profiles 8 oktober 2009
32 Cooperation and exchange is needed nourishment Bovenrijn ( & WSD; Deltares-BAW-BfG) Realisation Modelling Monitoring Evaluation Expertise on parallel dams Revitalising banks and groyne fields at locations with heavy traffic Flood plain dynamics Efficiency in fairway maintenance More (fine) sediment from the Niederrhein.. 32 Management of fairway profiles 8 oktober 2009
33 zurück zum Inhaltsverzeichnis zur Kurzfassung Thank you for your attention! Arjan Sieben 33 Management of fairway profiles 8 oktober 2009
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