Kajian Model Arus Menyusur Pantai dengan Model Baoussinesq Wave pada Groin Permeable

Various of the coastal area protections have been developed by many countries through engineering approachment which is growing rapidly. An impermeable groin is one of the applied beach protection to reduce erosion in Indonesia. Unfornately, this structure has an disadvantage because there is still found some erosions in downstream area. It is necessary to do an alternative research on the effectiveness of permeable groins to reduce the coastal erosion. A direct research on the beach takes much time and more expensive budget, so we have a physical prototype model of the permeable groins at the Laboratory of Hydraulics, Department of Civil and Environmental Engineering, Gadjah Mada University in Yogyakarta. But this has a little problem which the current velocity on physical test models can only be done at certain points. Furthermore, the observasing data has been input to the mathematical models using 2D Boussinesq to determine the longshore current velocity which is reduced by the permeable groins structure along the coastal. In this research, the mathematical model has been made with two groins, permeable and impermeable groins, with the variation is in length and distanc