Innovation design roughness on slope to reduce storms at curved seawall in canggu Beach Bali

Abstract

Seawall or revetment has been designed to preserve coastline erosion from waves. The seawall system or revetment could protect againstpowerful wave, reduce hydraulic power in underring material and constribute to wave reflection. The result of survey show that seawall system have to be repeatedly observed to maximize seawall action to produce a modification of seawall design.In this research, hydrodinamic seawall action is conducted by employing its curve, slope and roughness. It is investigated by using physical modeling in 2D Laboratory of Coastal Dynamics Institute Yogyakarta, Indonesia. Type of wave used in this study is Regularwave within one period of time. Wave experiment is examined in 30° of its slope, constant water depth is0.4 m and roughness on its slope using two types of sequential block position and zig zags. This research results in the significant Reflection Coefficient (Kr) which is 0.141 produced by design 1 compared to the previous research is 0.16923. Therefore, it can be concluded that design 1 is more reliable in reducing reflection wave.