using sediment as a resource - sednet · west point, including oyster shell breakwater artificial...
TRANSCRIPT
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USAR - Using Sediment As a Resource
Using sediment as a resource
Brightlingsea Harbour
Image: courtesy of Brightlingsea Harbour
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Commitment
Using Sediment As a Resource
• Interreg 2 Seas Programme
• Priority: Resource efficient economy
• Objective: increase the adaptation of new solutions for a
more efficient use of natural resources and materials
• Work Package: Use of marine dredged sediment in
coastal saltmarshes as coastal defence
• Start date: 01 March 2016
• End date: 30 April 2020
Using Sediment As a Resource
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Brightlingsea, UK
Using Sediment As a Resource
• Interreg 2 Seas Programme
• Priority: Resource efficient economy
• Objective: increase the adaptation of new solutions for a
more efficient use of natural resources and materials
• Work Package: Use of marine dredged sediment in
coastal saltmarshes as coastal defence
• Start date: 01 March 2016
• End date: 30 April 2020
Using Sediment As a Resource
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Image: adapted from Toft et al. 1995
Ecosystem Services
Using Sediment As a Resource
Using Sediment As a Resource
• Natural coastal flood defences
• Internationally important wetland habitats
Little Egret
Sanderling
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Dredging and Restoration Sites
Using Sediment As a Resource
Using Sediment As a Resource
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September 2015
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October 2018
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Techniques
• Dredging Techniques:
• Water Injection Dredging, close to infrastructure on ebbing tides
• Plough, to obtain level bed for ease of navigation
• Cutter Suction Dredging, Year 2 only prior to hydraulic pumping
• Excavator, to maintain mechanical strength for beneficial reuse
Using Sediment As a Resource
Using Sediment As a Resource
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Techniques
• Restoration Techniques:
• Construction of traditional brushwood fascine (polder) retaining structure
• Mechanical placement (excavator)
• Hydraulic pumping (Year 2 only, St Osyth borrow pits)
Using Sediment As a Resource
Using Sediment As a Resource
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Year 1, Oct. ’16 – Mar. ‘17
Using Sediment As a Resource
Using Sediment As a Resource
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Using sediment as a resource
Using Sediment As A Resource
Main channel west
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Using sediment as a resource
Using Sediment As A Resource
Trial sites
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Using sediment as a resource
Using Sediment As A Resource
Trial sites
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Using sediment as a resource
Using Sediment As A Resource
Trial sites
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Year 1 Work Outcomes
• Approximately 16,000m3 dredged
• Successful placement (and retention!) of 400t of dredged material
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2, Oct. ‘17 – Mar. ‘18
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2 Work Outcomes – Autumn phase
• Approximately 9,000m3 dredged by Smals and pumped into St Osyth Pits
during the autumn phase of this years works
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2 Work Outcomes – Bathymetry (autumn phase)
• Pre dredge and post dredge bathymetry as well as progress bathymetry
taken to control the operation
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2 Work Outcomes – Autumn phase (Nov 2017)
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2 Work Outcomes – Monitoring (October 2018)
Using Sediment As a Resource
Using Sediment As a Resource
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Working with Nature– Monitoring (October 2018)
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2 Work Outcomes – Spring phase
• Approx. 4,500m. cu. Dredged with a long reach excavator and placed in the
Cindery West compartments.
Using Sediment As a Resource
Using Sediment As a Resource
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Year 2 Work Outcomes – Spring phase Using Sediment As a Resource
Using Sediment As a Resource
Dredge progress bathymetry: 2nd February 2018, combined with Autumn phase post dredge bathymetry and previous UAV data (contours at 0.5 m intervals, CD bold)
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Year 2 Work Outcomes – Spring phase
• Approx. 400 m of brushwood fascine was installed to complete Cindery West –
West point, including oyster shell breakwater artificial reef
• Approx. 70 m of brushwood fascine were installed in Howlands Marsh, St Osyth
Creek site, and construction began on Howlands Marsh West site, including use of
Christmas trees from the community engagement project.
Using Sediment As a Resource
Using Sediment As a Resource
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Using sediment as a resource
Using Sediment As A Resource
Monitoring and studies
• Water quality monitoring
• Bird monitoring
• Vegetation monitoring
• Benthic sampling
• Sediment stability
• Method trials
• Pumping trial
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Using sediment as a resource
Using Sediment As A Resource
Environmental monitoring ongoing
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Using Sediment As a Resource
Using Sediment As a Resource
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Using Sediment As a Resource
Using Sediment As a Resource
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Using sediment as a resource
Using Sediment As A Resource
Environmental monitoring ongoing
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Christmas trees and brushwood fences,
Howlands Marsh (March 2019)
Using Sediment As a Resource
Using Sediment As a Resource
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Using sediment as a resource
Using Sediment As A Resource
Detailed research plan
• Wave attenuation
• Vegetation
• Geotechnical and consolidation
• Bio-geochemical cycling
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Using sediment as a resource
Using Sediment As A Resource
Thank you for your attention