Abstract
Bantan Coast in Bengkalis Island that suffered worst abrasion due to wave attack. Protection of abrasion area against the wave can be done by proper lay-out of breakwater with certain configuration. To get the optimal configuration of breakwater, wave pattern around the breakwater were analyzed quantitatively. It was conducted to obtain the optimum condition of wave height reduction produced. Evaluation of breakwater lay-out effect to wave pattern can be done by numerical model approached. Wave pattern simulation that occurred due to the breakwater was done by Surface water Modelling System (SMS) - CGWAVE software module. This module is a 2-D depth average numerical model using finite element model. To get accurate simulation, a deviation of the numerical result and the measurement result at several locations was used as the indicator parameter in the calibration process. The results showed that from the result of calibration process was used 1.3 meters wave height and 5.4 seconds wave period. Three breakwaters 20 meters slit configuration produced a maximum value of wave height reduction and wave velocity reduction (in comparison wave simulation without breakwater). This configuration produces 60% height reduction and 14% velocity reduction.
Highlights
According to research [1], the most of the northern coast Bengkalis’s Island has abrasion occurred
Construction of the breakwater can be done by first knowing the wave conditions that occur in the coast. This condition can be estimated by applying the numerical model approach
The specified point of view on object location giving by point 1,2, and 3. This point is located as same as breakwater existing position
Summary
According to research [1], the most of the northern coast Bengkalis’s Island has abrasion occurred. In the last 26 years, there has been abrasion in Bengkalis Island with an average abrasion rate of 59 ha/year. This is one of the reasons why this coastal abrasion problem needs to be studied. Studies on this abrasion problem can be done one of them with theoretical and mathematical studies. Construction of the breakwater can be done by first knowing the wave conditions that occur in the coast. This condition can be estimated by applying the numerical model approach
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