Structure and Sediment Interactions
The City of Galveston is protected from extreme storms by a 17-km concrete seawall facing the Gulf of Mexico. Recent investigations have shown that the seawall may not be sufficient to protect against a 1-in-100 year design storm. Since raising the seawall disconnects the city from the beach and may be very costly, a hybrid approach is being discussed in which the existing hard structure is covered by a dune. This study investigates the hydro- and morphodynamic effects of adding a sand cover to the Galveston Seawall under extreme storm conditions with the numerical model XBEACH.