Muhammad Syahril Badri Kusuma
Abrasion is one of the problems in river estuary areas in Indonesia which has become increasingly severe in recent years. Abrasion not only results in changes to the coastline, but can also damage wave break systems (such as mangrove forests, revetments, jetties, etc.), surrounding infrastructure, and the ecosystem in the affected area. One area in Indonesia that needs more attention regarding the abrasion cases experienced is the Plumbon River Estuary which is located on the West Semarang Coast, Semarang. The Plumbon River is one of the large rivers in Semarang which flows into the West Semarang Coast with several other large rivers, such as the Mangkang Wetan River, the Silandak River and the Siangker River. These rivers are located in densely populated areas and are generally used as transportation routes for fishermen there. In addition, the location of the mouths of these rivers close to airports and ports causes social and economic activities in the area to increase. However, this can be damaged by increasingly serious water-related problems, one of which is abrasion. This is marked by a change in line, in the 2019 – 2022 period alone, a land reduction of 13.7 Ha in the western part and 13.3 Ha in the eastern part of the area around the Plumbon River Estuary has been observed. Apart from that, the plan to build a coastal toll road will inevitably affect stability in the waters of the Plumbon River Estuary. Considering that the construction of toll roads in this area will also increase social and economic activities in the surrounding area. Furthermore, it will also be necessary to study a better protection system than before, especially in terms of its effectiveness and durability, so that it can maintain or increase this stability.
The aim of this community service is to identify problems with coastal damage at the mouth of the Plumbon River. As well as analyzing protection systems that are better than before, especially in terms of their effectiveness and resilience, so that they can maintain or increase river stability.
A study that can recommend a more appropriate type and layout of coastal buildings to protect the coastline by controlling wave abrasion. This will be beneficial for local communities to reduce the negative impacts of coastal erosion such as tidal floods.