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Langstone Harbour entrance coastal process study

Minor funds contribution 2018-2020

Alex Hillawi, Eastern Solent Coastal Partnership: £4000

The SCOPAC coastline is intersected by multiple tidal inlets. Coastal processes at these locations are typically complex, often producing morphological changes which can have serious management implications. A good example of this can be observed at the Langstone Harbour entrance (see Figure 1) where complex sediment dynamics result in hotspots of erosion and accretion causing multiple management issues.

Figure 1: Sediment transport pathways at the Langstone Harbour Entrance (SCOPAC STS, 2012)

It would appear from recent regional monitoring programme (www.channelcoast.org) data that the two local sediment sources feeding Eastney spit (the West Winner and Horse and Dean Sands) are no longer present. The reasons behind this are not currently understood and a better understanding is required in order to manage the frontage and the private and commercial properties located on the spit. 

The SCOPAC minor fund is a contribution towards a Master’s thesis being undertaken by Alex Hillawi, supervised by the University of Southampton and the Eastern Solent Coastal Partnership. The research will investigate the reduction and loss of the West Winner and Horse and Dean Sands and the impact this will have on the long-term management of Eastney Spit in terms of a reduced sediment feed.

The grant will contribute towards the cost of RFID tracer pebble surveys to track material movement around the spit. The resulting data will then be analysed in GIS, alongside existing regional monitoring programme data.

Pebble preparation is now underway with 500 native pebbles collected from site ready for drilling and tagging with Radio Frequency Identification Tags. It is anticipated that the tracer pebbles will be deployed on Eastney beach by early spring 2019.