Stable Coastline between Two Groins Equation

In this research an equation of static equilibrium geometry shoreline on coastal segment between two groins with quadratic polynomial equations is developed. Equation coefficients were formulated based on the characteristic of stable coastline geometry of the previous study and conservation law of mass, where volume of erosion and sedimentation are identical. The equation is capable of predicting erosion and accretion for coastline between two groin. Furthermore, with the predicted erosion and sedimentation, the groins gap and the length of groin can be planned using maximum permitted erosion criteria.