engleski

EVOLUTION OF THE BEACH IN FRONT OF A NEW SEAWALL: CLEVELEYS, UK

This paper will present an analysis of beach changes caused by the construction of a new seawall in Cleveleys, UK. Seawalls, of which the primarily role is to protect the coastline from coastal flooding and also partly from erosion, can have a negative impact on surrounding beaches. Seawalls increase wave reflection and interact with the beach groundwater regime, and hence exacerbate beach erosion and the formation of local scour at the toe of the seawall. This in turn can affect the stability of the whole construction. Several laboratory and field studies have been conducted to understand the impact of seawalls on beaches. Contrary to expectations, some field studies showed that seawalls do not necessarily affect the natural beach regime. However, the beach variability and hence beach volume changes are much higher on beaches protected by seawalls than on unprotected beaches. In the areas with large tidal ranges and with seasonal variability in the wave conditions, beach lowering and/or scour might be short-lived features taking place only during storm conditions with high water levels and waves (e.g. Sutherland et al. 2003). Hence the monitoring of beach changes over the short- and long-term is equally important.

seawall; beach; changes

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