Abstract
Coastal erosion is the process of land erosion in coastal areas due to waves and ocean currents which reduce land and can adversely affect socio-economic activities in coastal areas. Coastal erosion risk assessment in the estuary is a development of previous research, because the erosion and accretion processes do not only occur along the shoreline, but also on the side facing river water bodies, due to the confluence of fluvial and marine processes. The landward shift of the shoreline in the Muara Asam Asam coastal area has reached 90 meters in the last 28 years, and has been detrimental because the area is a densely populated area with major economic activities in the fisheries and agriculture sectors. This study aims to determine the coastal erosion risk level zones based on the relationship among vulnerability and consequence parameters, through distance decay weighted based method. The results indicate that Muara Asam Asam has high risk zones of coastal erosion, especially in densely populated residential areas and dry land agriculture on the west side of the estuary, due to the lack of implementation of preventive measures through hard coastal structure and coastal zoning policy to protect socio-economic activities and coastal ecological environments.
Highlights
The coastal area is a very important environment for the community, because it supports a large number of activities related to fishing, navigation, trade and tourism
Apart from being easy to modify, such as changing the weight of each parameter or changing its parameters, this method can be implemented in various geographic information system software, making it easy to access in spatial analyzes related to coastal area management
3.1 Study area The research area is a coastal area of Asam Asam River Estuary, Muara Asam Asam Village which is located in Jorong District, Tanah Laut Regency, South Kalimantan Province, shown in figure 1
Summary
The coastal area is a very important environment for the community, because it supports a large number of activities related to fishing, navigation, trade and tourism. The presence of anthropogenic processes in coastal areas raises concerns related to hazards affecting coastal areas such as tidal waves, storms, tidal flooding, coastal erosion, and sea level rise. To address the potential consequences of these hazards, several methods for assessing the level of vulnerability and risk of coastal erosion have been developed. In the risk assessment of coastal areas, the occurrence of coastal erosion is defined as a hazard, which is a hazardous phenomenon that can cause loss of life, injury or other health impacts, property damage, loss of livelihood and public service facilities, social and economic disruption, or environmental damage [9]
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