ASTONJADRO: CEAESJ pISSN 2302-4240 eISSN 2655-2086 Volume 11, Issue 2, June 2022, pp.319-325 DOI: http://dx.doi.org/10.32832/astonjadro.v11i2 319 IMPACT OF ABRATION ON LAND USE IN COASTAL AREA BULELENG REGENCY Luh Putu Gita Ari Parwati, Ngakan Ketut Acwin Dwijendra, Ni Ketut Agusintadewi Program Perencanaan dan Manajemen Pembangunan Desa dan Kota (PMDK), Program Magister Arsitektur; Universitas Udayana Bali, INDONESIA E-mail: acwin@unud.ac.id ABSTRACT Coastal damage due to abrasion and wave erosion in Buleleng Regency is very potential, even information from the Buleleng Regency Marine Service released information that the length of the coast in Buleleng Regency which has been damaged is not less than 5 km. Abrasion and wave erosion resulting in erosion of the coastline and will continue to affect land use. In this study using quantitative methods with analysis stages consisting of, among others, land use and analysis of the impact of abrasion on land use. The analysis carried out is a Geographic Information System (GIS) based analysis in accordance with the needs of the research in spatial terms. The conclusions obtained from this study are the types of land use that exist in the Coastal District of Buleleng Regency are in the form of airports, lakes / reservoirs, forests, mangroves, stretches of beach sand, ports, plantations/gardens, paddy fields, rivers, moor and shrubs. The abrasion that occurs in the Coastal Zone of Buleleng Regency every year with vulnerability during 2013 - 2019 has an impact on land use changes. This can be seen through the results of overlapping overlay analysis and seeing the area of land use that has changed. Keywords: abrasion impact; coastal area; land use; erosion; overlapping. Received: 2021-12-21 Revised: 2022-02-17 Accepted: 2022-05-05 Available online: 2022-05-13 INTRODUCTION In Law Number 1 of 2014 the coastal area is a transitional area between land and sea ecosystems which is filled with changes on land and sea. Given its geographical position, coastal and coastal areas are very strategic areas. Coastal areas are developing so fast for various human needs including as residential areas, ports, industry, fisheries, agriculture and also as recreational areas or tourist areas. As a transitional area, the coast gets quite a lot of influence from the two areas it borders. The influence of various physical activities of the ocean such as waves, currents and tides can cause changes in coastal landscapes. The threat of disasters that often occur in coastal areas, apart from sudden threats such as earthquakes, tsunamis, tidal waves and others, is also a slow but sure threat, namely coastal abrasion. Coastal abrasion is damage to the shoreline as a result of the release of coastal materials, such as sand or clay that is continuously hit by ocean waves or due to changes in the balance of sediment transport in coastal waters (Cakrawijaya C et al, 2014; Fajrin F, et al, 2016). Coastal abrasion or erosion is caused by the transport of sediment along the coast, resulting in the movement of sediment from one place to another. Sediment transport along the coast occurs when the direction of the incoming wave forms an angle with the normal line of the coast. Coastal abrasion not only makes coastlines narrow, if left unchecked can become even more dangerous. This can threaten the settlements of residents in the coastal area. From the point of view of the balance of interaction between land origin forces and sea origin forces, Abrasion occurs because sea origin forces are stronger than land origin forces. The main factor for abrasion is wave activity on the beach which occurs continuously and cannot be resisted by coastal materials. Abrasion does not occur immediately, but occurs over a long period of time, due to continuous waves, the beach will gradually narrow and get closer to settlements around the coast. Not only the strength of the waves, it will be the edges of the waves that continuously cause abrasion (Pananrangi P, Idham A, 2009; Prameswari P et al, 2014; Wijaya W et al, 2017). One area of Indonesia that has the potential for abrasion is Buleleng Regency. Buleleng Regency is located in the northern part of the island of Bali with a fairly high marine potential. This is evidenced by the beach length of 157.05 Km. According to data from UURI (2014)