Salient Modeling at offshore Breakwater for oblique wave using least Square weighted Residual Method

This research is the continuation of previous research by the writerusing polynomial approach with the purpose of fixing various constraints in the previous method. The salient equation used in this research is similar to the one used in the previous research, i.e. the principle of static equilibrium coastline where the tangent of the stable coastline is similar to the tangent of the crestline. In the previous method, the salient equation was approached with a polynomial equation, then polynomial coefficient is obtained by applying the first differential (tangent) of the polynomial in various points with the number of points that is in accordance with the number of polynomial coefficient. There is an obstacle in this method, i.e. the setting of boundary condition points that should be done with trial and error In this research the tangent equation of the salient is approached with polynomial equation using five points of sample. Salient equation is also approached with polynomial. To obtain polynomial coefficient, the first differential of the salient equation is equalized with tangent equation of the salient and Least Square Weighted Residual Method is applied. Unlike previous research, there is no constraint in this research using this method. Comparison with the result of the research from previous researches shows a conformity of the result of the model with the result of the previous research.