SEDIMENT DISTRIBUTION ANALYSIS ON PLUMBON RIVER ESTUARY, CENTRAL JAVA

• Main Author: Kusuma, Widharta
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74556
• Institution: Institut Teknologi Bandung

Mangunharjo Beach (Semarang, East Java), like many other beaches along the northern cost of the island of Java, has been experiencing changes on their coastline. These changes, caused in parts due to land subsidence, erosion and abrasion, as well as sedimentation, which negatively impacted the farming and agricultural activities in the area. This paper studies the scale and impact of the erosion and sedimentation along the coastline of Mangunhajro Beach, by interpreting the difference in tide measurement at the same location in 2019 and 2022. The primary data used in this paper are collected using bathymetry, and have referential difference of 0.43 metres that might affect the tidal forecasting. Hydrodynamic modelling of the location, simulated using Delft3D, showed that in 2021, the coastline had lost 0.03-0.05 meter in thickness due to erosion. Sediment transport suspension of 0.0015-0.0030 kg/m3 was observed to be moving eastward during wet season (Musim Barat) and westward during dry season (Musim Timur), thus resulting in the changes to the coastline.