Eastoke Frontage, Works Update
Beach management works on Hayling Island are now complete. Working with our contractors Boskalis Westminster Ltd. and Les Searle Plant Hire & Sales Ltd., we have been able to carry out a successful beach management campaign, completing the works within budget and programme. Working in partnership we have been able to use their availability and expertise to react quickly to the 2nd November storm event on the island with minimal disruption.
The works lasted 3 weeks in total and involved the movement of approximately 40,000m3 of shingle, deposited via a pump-ashore from the dredger, the Sospan Dau, and from beach recycling. The first two weeks work on site involved the dredging of shingle material from the Chichester Harbour Approach Channel 24/7; deepening the channel to allow safe navigation in to Chichester Harbour (with the ESCP working in partnership with Chichester Harbour Conservancy), and providing shingle nourishment for the beach at Eastoke. For the second week, trucks were mobilised to site to move the shingle to key locations, and profile the beach to design. The Sospan Dau left site on 1st November having completed the expected works. A storm event impacted Hayling Island on 2nd November 2019 and the beach crest was overtopped, with shingle and seawater pooling on the promenade as typically occurs. Working with our contractor, we were able to quickly respond to the storm, with works commencing on Monday 4th November to reinstate the beach profile, as well as clear the promenade of shingle to allow pedestrian access along the seafront. The promenade clearance was completed in 2 days. The works were funded by the Environment Agency, and will be monitored over the next 6 months to assist with planning our next flood management campaign.
Proposed Beach Nourishment Works, Autumn 2019
|What is beach nourishment?||Why is it needed?|
Beach nourishment is the placement of material from offshore on the beach. This will restore beach levels and maintain the Standard of Protection against coastal flood and erosion risk to the residents of Eastoke, Hayling Island.
We are proposing to place up to 30,000m3 of material on the beach, to raise the profile to the recommended 1:200year Standard of Protection. We will use land-based machinery on the beach to move the material around and provide a design beach profile.
|The Eastoke peninsula is a densely populated area. The majority of it is low-lying with a record of serious flood incidents prior to 1985. In 1985 the beach nourishment scheme was implemented, creating a man-made beach in front of the now redundant seawall. Coastal processes are constantly eroding this frontage and without periodic maintenance the redundant concrete seawall would again be exposed. As a result, regular serious flooding of Eastoke would commence, allowing on-going erosion of the coastline|
Where will the project take place?
The nourishment works will take place at the following locations along the southern Hayling Island frontage:
Where is the material coming from?
Material for this operation will be dredged from the approach channel to Chichester Harbour. Shingle material has recently accreted in this area causing a navigational hazard to local mariners. Dredging the approach channel maintains the safe navigation whilst providing coastal flood and erosion risk management to the properties at Eastoke.
Once the dredge campaign has commenced, we will bring land-based machinery in to site. It is expected that an excavator, bulldozers and potentially dumper trucks will be used to transport the shingle from the area of deposition to the locations where it is required to build the beach profile to design. The beach will be profiled to the correct design to provide protection to Eastoke properties over the winter storm period.
When will it happen?
|The dredging works are programmed to start on 21st October 2019 at the earliest and will continue for up to 14 days. The works are dependant on the weather conditions; if the wind speed and the wave height are too large the works will stop until the weather improves.||The Contractor will be operating over the full 14-day period, but only for 2-3 hours over each high tide. Due to the time of the tides changing throughout the contract, the actual working times will vary each day. It is expected that it will take approximately 1 hour to pump each load on to the beach, and we are anticipating two loads to be deposited each high tide. The works will run over the 24hour period each day.||The movement of the shingle on the beach by land-based machinery will take place during the same period as the dredging, with the possibility of this machinery remaining on the beach for a few days following completion of the dredge works. The land-based machinery will work weekdays only, with working permitted between 6am and 10pm daily. For both sets of works, the hours depend on the weather conditions. Should conditions on site deteriorate all works will stop until the weather has improved. This means that the dates provided in this information may vary. Should this vary significantly we will keep the public and local residents updated.|
How will we carry out the works?
The work will involve the following activities:
- Dredging shingle for nourishment from Chichester Harbour Approach Channel;
- Temporary closures of small areas of Eastoke Beach to receive material;
- Pump ashore of the shingle from the dredger;
- Movement of shingle by land-based machinery to profile the beach.
Once the shingle has been dredged, it will be pumped on to the beach from the dredger by a process known as ‘rainbowing’. The dredger has a very shallow draft allowing the vessel to come very close in shore, and then a jet pump is used to pump the material on to the shore. The dredger which will be used for these works is called the Sospan Dau – and is operated by Boskalis Westminster Ltd. For live location information on the Sospan Dau, please click here.
This will be a 24-hour operation due to the tidal nature of the works. The project may cause some noise disturbance however we will endeavour to keep the level of inconvenience to a minimum. We request your co-operation for the duration of the works as the project aims to reduce the risk of continuing erosion of the coastline and serious flooding of the Eastoke area.
|What will the beach look like?||Will I still be able to use the beach?|
|Initially material may look darker than the beach at present, and some ‘cliffing’ of the newly deposited material may occur as the material sorts itself through natural processes. The beach will return to it’s natural profile in time.||
Approximately 300m sections of the frontage will be cordoned off at any one time in order to allow the pump ashore to take place safely. Small areas of the promenade will also be closed while the pumping is underway. There will be clear signage at all access points to the beach, and a Beach Master on site during all works.
The beach will be open to the public while the land-based machinery is working on the beach. The public should be aware that heavy machinery will be operating on the beach for a period of up to three weeks.
At all times when work is underway there will be a site manager from the Contractor available on site, along with ESCP staff.