ANALYTICAL AND NUMERICAL STUDY ON THE EFFECT OF GROYNE TO SHORELINE EVOLUTION

• Main Author: Aptana Widjaja, Bryan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/58438
• Institution: Institut Teknologi Bandung

In this research, we will investigate the effectiveness of groyne in reducing erosion and shoreline protection of sandy beach, particularly Sanur Beach in Bali. One of the root causes of erosion in sandy beach is littoral transport. Littoral transport is the movement of sand parallel to the shoreline due to wave of sea water hitting the shoreline. Groyne is a type of breakwater installed perpendicular to the shoreline protruding to the sea. Over time, groyne will naturally split the two sides into the updrift and downdrift sides. The existence of groyne will reduce littoral transport, cause precipitation of sand at the updrift side, and cause sand by-passing to happen to the downdrift side in the long run. These three things significantly reduce the damage caused by erosion and make groyne one of the effective shoreline protection measure of sandy beach. The mathematical model that will be used as the foundation of this research is the Pelnard-Considere one-line model. We will first solve the equation analytically for various scenarios of shoreline topologies by using the variable substitution and Laplace transform method. On top of that, we will conduct numerical simulations using the BTCS and Crank-Nicolson method on the same scenarios to then compare the result with the analytical solution we have derived previously. Lastly, the same numerical simulation framework will be applied to investigate the shoreline evolution of a real segment in Sanur Beach