Case study:Poole Bay Beach Replenishment Trial

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Location: 50° 41' 52", -1° 55' 31"
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Project overview

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Status Complete
Project web site http://www.therrc.co.uk/sites/default/files/projects/62_poole.pdf
Themes Flood risk management, Habitat and biodiversity, Monitoring, Social benefits
Country England
Main contact forename Leanor
Main contact surname Heron
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk/government/organisations/environment-agency
Partner organisations Borough of Poole, New Forest District Council, Channel Coastal Observatory, SCOPAC
Parent multi-site project
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encompassing the following
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Project summary

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The trial aimed to test a new approach to beach replenishment in Poole Bay on the south coast of England. The concept was to make use of locally dredged sediment and place it in the nearshore, allowing the prevailing waves and tidal currents to move the material toward and along the beach. This approach is used in the Netherlands and more recently in Denmark. The trial is the first of its kind in the UK. Although it was proven that there is a sediment transport connection between the nearshore and the adjacent beach (that is, nearshore deposition can replenish the beach), it remains difficult to assess the long-term fate of the material. It is likely that both a larger quantity of material and more time are needed for sediment dispersal at this site to demonstrate the long-term viability of nearshore replenishment as an alternative to traditional methods.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment



Site

Name
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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 2015
Works started
Works completed
Project completed
Total cost category
Total cost (k€) £150,000
"£" is not declared as a valid unit of measurement for this property.
Benefit to cost ratio
Funding sources Defra, Flood and Coastal Risk Management, Environment Agency, Welsh Government, Borough of Poole, New Forest District Council, Channel Coastal Observatory, SCOPAC

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 Beach nourishment
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

Biological quality elements

Element When monitored Type of monitoring Control site used Result
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Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
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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

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Supplementary Information

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