Abstract
Coastal areas in the Canggu and Seminyak areas located in Badung Regency, Bali Province are very attractive tourism. The development of tourism has an impact on coastal conditions. The coastal conditions analyzed are changes in coastline that occurred during 2015-2019 using remote sensing. The satellite image data used in the analysis is Sentinel 2A image data that can be accessed for free with a spatial resolution of 10 meters. Image data processing is divided into three stages, namely preprocessing, processing, and post processing using Sentinel Application Platform (SNAP) software. The preprocessing stage includes the resampling, masking, and subset areas. The processing stage includes digitizing the coastal area, digitizing accuracy analysis using the Support Vector Machine (SVM) method, and the post processing stage including correction of shoreline changes. Bands in image data used for detection of coastal areas are band 8 (NIR), 8A (narrow NIR), 11 (SWIR), and 12 (SWIR). Based on the results of the analysis of shoreline changes carried out during 2015-2019, it was found that the average shoreline changes were 1.42 m / year with erosion conditions in which the dominant wind direction originated from the southwest towards the northeast coast of the sea of ??Bali. The results of digitizing the coastal area using the Fine Gaussian SVM method with the greatest accuracy value is 87.8%.
 
 Keywords: Shoreline Change, Remote Sensing, Sentinel 2A, SVM, Wind Direction
Highlights
Natural phenomena such as wind, waves, tides, sediment flows and transportation that occur continuously in coastal areas will cause a dynamic of coastal areas in the form of shoreline changes
According to Shuhendry (2004) in Halim et al (2016), activities that can affect the occurrence of shoreline changes are land conversion and conversion of coastal protection lands to support tourism activities that are not in accordance with the applicable rules so that the balance of sediment transport can be disrupted, currents and waves triggered by sand mining
In the dry season that occurs in June, July and August, the wind direction generated is relatively constant for the year of analysis during 2015-2018
Summary
Natural phenomena such as wind, waves, tides, sediment flows and transportation that occur continuously in coastal areas will cause a dynamic of coastal areas in the form of shoreline changes. Beach abrasion in the Canggu area can be seen with beach shifts that are starting to approach tourism supporting buildings such as restaurants and bars.Based on the Report on Coastline Change Analysis of the Balai Wilayah Sungai Bali - Penida (BWS Bali-Penida), the results of erosion rates in 1999-2009 were 1.75 m/year and in 2009-2015 were 1.96 m/year in Canggu Area, North Kuta District, Badung Regency. Seeing this problem, the authors want to know the changes in the coastline that occurred in 2015 - 2019 through Sentinel 2 Imagery Data. The author wanted to analyze the relationship between wind direction and the rate of change in coastline that occurred at the study site
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