Case study:Poole Bay Beach Replenishment Trial

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Location: 50° 41' 52.48" N, 1° 55' 31.29" W

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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
This is a parent project encompassing the following projects	No

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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.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit 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 Edit 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 Edit reasons for restoration Mitigation of a pressure Flood and coastal erosion protection Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information