Abstract
Sea dikes in Viet Nam have been built up during a long history. Every year, about 4 to 6 storms attack the coast and cause severe damages of the sea dikes. Till now, little is known about strength and stability of the inner slope covered with grass under impacts of wave overtopping during storm surges. Destructive tests have been performed with the Wave Overtopping Simulator in Viet Nam revealing that grass slopes are able to withstand a certain amount of wave overtopping. In Hai Phong, a slope section covered by Vetiver grass could suffer a maximum wave overtopping discharge of up to 120 l/s per m. In Nam Dinh, three tested locations within a short dike section of 50 m show a large variation in erosion resistance of the Bermuda grass slope with maximum discharge of 20, 40 and 70 l/s per m.
Highlights
Sea dikes in Viet Nam The coastline of Viet Nam is protected by systems of sea dikes with a total length of about 2700 km from North to South
The dike is a body of soil and the crest and seaward slope are armoured with quarry stones and concrete blocks, while the inner slope is often covered with grass
A large number of sea dike failures have been initiated from damages induced by wave overtopping on the dike crest and inner slope
Summary
Sea dikes in Viet Nam The coastline of Viet Nam is protected by systems of sea dikes with a total length of about 2700 km from North to South. A large number of sea dike failures have been initiated from damages induced by wave overtopping on the dike crest and inner slope. Destructive tests were performed on a dike slope covered with Bermuda grass (Cynodon Dactylon) at the sea dike in Hai Hau – Nam Dinh in Jan 2010.
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