Abrasion and accresion at West of Buleleng subdistrict's coastal area, Bali (case study: Gerokgak Regency, Seririt Regency, Banjar Regency, and Buleleng Regency)

Gerokgak, Seririt, Banjar, and Buleleng coastal areas are located in the west of Buleleng Regency, Bali. These area are prone to abrasion and accretion. Abrasion and accresion is a natural phenomenon that's runs balanced. Human factor caused this phenomenon were change the balanced, it causes harm to humans. The purpose of the research were to analyze influece of abrasion and accresion toward land use wide at coastal area. The research used Landsat 5, 7, and 8 images with 3 periods which were 1990 and 1997, 1997 and 2007, and the last period was 2007 and 2017. The data were processed by calculate long, width, and wide of coastline change inter period. It were relate with wide's land use change at coastal area. The result showed that abrasion and accresion were happen along the coastal areas in research area. The worst abrasion were located in Gerokgak Subdistrict with extensive 217.109 m² One of it's impact are some ponds and buildings around the Segara temple at Gerokgak Village's were destroyed.