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19 februari 2020
Sediment-management
Fixed layers
Matthijs Boersema (RWS-WVL)
@ Ricardo Smit
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Fixed layers in the River Waal
19 februari 2020
• Bottom groynes Erlecom - 1996 (kmr 873-876)
• Fixed layer Nijmegen - 1988 (kmr 883-885)
• Fixed layer Sint Andries - 1999 (kmr 925-928)
Thickness layer 70 cm (40-200 kg), average: 35 cm diameter
Length 2-3 km, width 100-150 m
Increasing navigation width with 50 m
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How fixed layers work
19 februari 2020
1974
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19 februari 2020
How fixed layers work
Fixed layer Nijmegen at kmr 883.5
Wid
th n
avig
ation c
hannel (m
)
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19 februari 2020
Bed-level 2018Fixed layer
Source 1.Bodempeilingen trend 20 jaar (RWS-ON)
2.MIRT Duurzame bodemligging Rijntakken (2018)
Fixed layer Nijmegen
Hard substrate ina soft environment(…)
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Bed-level trend simulations
19 februari 2020
Source 1. Measures related to the fixed layer at Nijmegen (2019)
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Transport on the River Waal
19 februari 2020
• 2.80 m water depth at 1020 m3/s
• In 2018 156 days below 2.80 m
• Economic damage 65-260 M€
• 2-3 months issues with fixed layer N.CEMT-VI class
CEMT-V class
Source: Economische schade droogte, Ecorys (2019)
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Measures
19 februari 2020
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Measures – fixed layer Nijmegen
19 februari 2020
• DBR study (Sustainable Riverbed level Rhine Branches)
– Adaptation of fixed layer Nijmegen is urgent
• Remove
• Lower
• Longer
“Start with pilot and increase navigation
comfort over fixed layer + increase knowledge
about sediment management”
Must be part of IRM Integral managing riverbed level
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Pilot fixed layer (FL) Nijmegen
19 februari 2020
Adaption FL
Sediment management
Short term (2 years)
Medium term (25 years)
Long term (>50 years)
Improve comfort
=> IRM
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Measures pilot fixed layer Nijmegen
19 februari 2020
Improve comfort
squat
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19 februari 2020
Groyne field nourishments (5x)
Improving nature developent, fresh sandin floodplain
3
Streamline
Sediment management
Measures pilot fixed layer Nijmegen
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Step 1. flatten fixed layer
19 februari 2020
Start: asap
Difference with contract level (maximum level of the fixed layer)
at 04-09-2019
kmr: 885
kmr: 884
1974
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Step 2. Fill scour hole
19 februari 2020
• Start around end 2020, beginning 2021
• Monitoring ship movement (test Twentekanaal, Tarka-sytem)
– T0 measurement
– T-after measurement
• Monitoring morphological behavior
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Step 3. Groyne field nourishmentsOr other creative ideas….?
19 februari 2020
• Start end 2021
• 5000 – 20000 m3 Volume
• Monitoring morphology, waves, hydrodynamics
• Grain size / shape / etc.
• Early market involvement
Master student TUD
RHDHV, Deltares, RWS
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Joint ambitoin – living lab
19-2-2020
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19-2-2020
Thank you
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Waterkwaliteit & natuur
• daling (grond)waterstanden• verdroging van natuur • kapitaalvernietiging recente investeringen
• afnamedekkingsgraad kabels en leidingen• stabiliteitsproblemen infrastructuur
Waterveiligheid en waterbeschikbaarheid
• geleidelijke herverdeling afvoer, minder mogelijkheid om water te sturen
• zoetwater- & hoogwaterveiligheidsissues
• 20% transportkosten over 30 jr.• kans reverse modal shift, CO2 uitstoot• concurrentiepositie NL
Infrastructuur
Effecten op functies
Bevaarbaarheid
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• MIRT Onderzoek Duurzame Bodemligging Rijntakken
• Eindrapportage https://www.rijksoverheid.nl/documenten/rapporten/2019/06/06/mirt-onderzoek-duurzame-bodemligging-rijntakken
19-2-2020