ANALYSIS OF POTENTIAL INVOLUTION (ROB) DUE TO LAND USE CHANGES USING MACHINE LEARNING IN THE CIPUNAGARA RIVER FLOW REGION, WEST JAVA PROVINCE

• Main Author: Gurusu
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/64600
• Institution: Institut Teknologi Bandung

The growth and development of science causes human needs to increase. This has an impact on land use utilization, especially in watersheds. Cipunagara is one of the watersheds in West Java which has issues related to land use in the upstream watershed area and has an impact on the potential for tidal flooding in the downstream watershed area. Intensification, deforestation, clearing of ponds, and population increase are the factors that drive changes in use in the upstream Cipunagara watershed and expand the flood area in the downstream Cipunagara watershed. The purpose of this study was to determine the slope of the catchment area, to determine the spatial changes of land use in 1996-2020, the potential benefits of tidal flooding due to changes in land use in the Cipunagara watershed, the risk of tidal flooding based on the hazard index, vulnerability index, and capacity factors. The method used is the analysis of satellite images available on the Google Earth Engine cloud data platform using machine learning algorithms. The results of the slope analysis in the Cipunagara watershed are divided into five classes, namely the flat category with an area of 52,67 km2, the sloping category with an area of 823,98 km2, a slightly steep area of 226,79 km2, a steep area of 126,02 km2, and a very steep area of 74,96 km2. Land use is classified into four classes: open land (settlement, roads, vacant land), forest vegetation (mangroves, plantations, shrubs), waters/water (sea, rivers, lakes), and rice fields (fields, ponds, swamps). Changes in land use from 1996 to 2020, namely for open land/settlements experienced a -15% reduction in spacing (-196,92 km2), forest vegetation increased by +11% (+145,78 km2), waters/water decreased - 13% (-164,96 km2), and paddy fields/ponds increased by +17% (+216,11 km2). Analysis of the potential for tidal inundation (river runoff) downstream of the Cipunagara watershed correlates with changes in use of open land, forest vegetation, and rice fields with an area of 1.982 ha (47%). Meanwhile, the potential for tidal inundation (tidal events) is correlated with changes in the use of paddy fields and waters/water with an area of 2.213,93 ha (53%). Based on the results of the analysis and overlay mapping of tidal flood risk per village in the downstream area of the Cipunagara watershed, it is divided into three classes. The high-risk category for tidal flooding is found in Patimban Village and Pamanukan Sebrang Village with a risk score of 8,13-10,80. The moderate risk category was in Mayangan Village, Legon Wetan Village, Legon Kulon Village, Pangarengan Village, Bobos Village, Karangmulya Village, Rancadaka Village, and Pusakaratu Village with a risk score of 5,47-8,12. While the category of low tidal flood risk index was in Tegalurung Village, Gempol Village, Mundusari Village, Rancasari Village, Mulyasari Village, Pamanukan Hilir Village, Pamanukan Village, Ranca Hilir Village, Lengkong Jaya Village, and Pusakajaya Village with a risk score of 2,80-5,46. Recommendations for adaptation and mitigation strategies for reducing flood risk per village with medium and high categories consist of administrative policies and technical policies at village and district scales. Administrative policies refer more to village capacity building in general and focus on the development of village apparatus to support disaster management efforts for every disaster in the area. Meanwhile, the strategies in technical policies are increasing the effectiveness of prevention and mitigation, increasing disaster emergency preparedness, and handling, and increasing disaster recovery capacity.