This work was partly funded by the Ministry of Agriculture, Fisheries and Food under the Flood Protection Commission FD0306 with the Proudman Oceanographic Laboratory and NERC Contract F3CR07-G1-02. The OSCR system used was provided by NERC and deployed by the NERC OSCR unit at Southampton University. We are grateful to the anonymous reviewers for a number of useful suggestions on presentation and content.
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