Case study:Abbotts Hall Managed Realignment Scheme

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Location: 51° 47' 5", 0° 50' 52"
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Project overview

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Status Complete
Project web site
Themes Flood risk management, Habitat and biodiversity
Country England
Main contact forename Dave
Main contact surname Smart
Main contact user ID
Contact organisation Essex Wildlife Trust
Contact organisation web site http://http://www.essexwt.org.uk/visitor centres nature reserves/abbotts hall farm/
Partner organisations English Nature, Environment Agency
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Abbots Hall

Project summary

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The location of the project is in the North bank of the Salcott channel tributary of the Blackwater Estuary (Essex). The strategy was creation of new coastal (mudflat, saltmarsh, transitional grassland and grazing marsh) and freshwater habitats, together with the provision of natural flood defence. In order to achieve tidal inundation of the area available (49ha of the 85ha scheme are intertidal), five breaches were required along 3km of hard defences. The largest breach was 100m in width with a level of +1.5m OD (approximately MHWN), and the remaining four breaches between 10-20m (at higher levels). The main breach was included to moderate outflow by acting as a sill, reducing the tidal prism of the site, and controlling the phasing of exchange between Salcott Creek and the site itself. Phase 1 of the scheme was undertaken in 1996 and consisted of a regulated tidal exchange on part of the site (20ha). Pre-breach, a three year monitoring programme was undertaken to ensure appropriate scheme design for the site and to provide a baseline for determining its effects. Following realignment, a further five year monitoring programme was established to assess the effects and provide further information for the design of future schemes. Monitoring undertaken: Accretion / erosion.

Monitoring surveys and results

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The following aspects were monitored for at least two years (vegetation and birds longer): accretion / erosion on site (altimetry); accretion/erosion off site; scour (in breach B); bathymetry (one off); tidal levels and velocities; suspended solids off site; salinity off site; invertebrates off site (one off); vegetation; birds; fish; amphibians/reptiles

Lessons learnt

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According to the Essex Wildlife Trust (2005), the scheme has been effective in safeguarding the local natural environment of the Salcott Channel and the West Mersea Oyster Fishery downstream of the realignment site. The additional monitoring works undertaken at the request of the local oystermen have demonstrated no noticeable effects on their activities. The natural slope of the site has benefited small fry which have been observed rising through the vegetation with the tide. The gradual slope allows for the zonation of vegetation and provides a mosaic of habitats for a range of sizes and species of fish. The semi permanent pools, which are inundated on high tides, serve as feeding and refuge areas over a tidal cycle. On one occasion, 2000 herring/sprat were caught using a seine net in one tidal pool. This illustrates the value of the realignment site as being beneficial for both commercial and recreational fisheries in the Blackwater estuary. The tidal regime monitoring (Environment Agency, 2003) determined that no clear evidence of any significant change in upstream tidal levels following implementation was found, which is consistent with the predictions of change (these were of the order of a few millimetres). The general direction and phasing of flood and ebb flows remained unchanged (this was considered unsurprising given the generous configuration of the main drainage channel (Salcott Creek)). There seemed to be a slight increase in current speeds at the station closest to the realignment (as well as a 15% increase at another station). These increases were most marked on the ebb tide as water receded seawards. It was noted that the observed increase in current speeds compared favourably with anticipated increase. The absolute increase in velocity does not appear to have produced any significant erosion of the channel bed. No major hydrodynamic changes were observed in Salcott Creek in the period immediately after the breach (when potential changes would be expected to be most pronounced). By ‘restraining tidal outflow’ the main breach also promoted sediment deposition and accretion which consequently led to elevation increases and vegetation colonisation. The monitoring allayed local fears with regards to sediment concentrations that the realignment could generate ‘sediment plumes’ as no significant increase in sediment concentrations immediately after the breach were observed. This is consistent with little erosion being observed. Monitoring of suspended sediment concentrations was able to demonstrate that the realignment site was acting as a net sink for sediment (with sediment deposition described as ‘significant’) and not as a source and was thus able to dispel concerns associated with accumulations of fine sediment that were reported to occur downstream. The Essex Wildlife Trust(2005) states that ‘it turned out that the ‘problem’ was caused by a new colony of tubeworms and was unrelated to the Abbotts Hall realignment’.


Image gallery


The managed realignment at Abbotts Hall (shortly after first inundation;breaches circled in pink) - Google Earth derived aerial view
Water flowing into the site through the main breach (Taken by: C. Scot, ABPmer, 2004)
South-easterly view across site from bird hide (Taken by: C. Scot, ABPmer, May 2010)
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Catchment and subcatchment

Catchment

River basin district Anglian
River basin Combined Essex

Subcatchment

River name
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion
Dominant land cover
Waterbody ID GB105037033790



Site

Name Abbotts Hall
WFD water body codes GB105037033790
WFD (national) typology Intertidal
WFD water body name Blackwater Estuary
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use Arable
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources WWF and the Heritage Lottery Fund

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Flood and coastal erosion protection
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Flow velocities No Yes No No No

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Invertebrates No Yes No No No
Macrophytes No Yes No No No
Fish No Yes No No No

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Salinity No Yes No No No

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://www.essexwt.org.uk/visitor centres nature reserves/abbotts hall farm/ Essex Wildlife Trust’s Reserve Website

Supplementary Information

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