Universitas Indonesia Conferences, 2nd International Conference of Science and Applied Geography

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EFFECT OF ENSO MJO IOD ON SHORELINE CHANGES IN BADUNG REGENCY AND DENPASAR CITY, BALI
Muhammad Dimyati, Astrid Damayanti, Orendo Rusfian Raharjo

Last modified: 2022-11-27

Abstract


Climatic phenomena are interesting because they have a far-reaching impact on human life and the environment significantly. These changes can be seen clearly among the changes in coastline and living in coastal areas. This study aims to determine ENSO and IOD's effect on the shoreline changes along the 80 km in the District of Kuta, District of Kuta Selatan, Badung Regency, and District of South Denpasar, Denpasar City, Bali. The parameters used in this study are the energy of destruction and erosion shoreline resistance as factors that influence shoreline changes and the rate of shoreline change in every shoreline characteristic. Shoreline changes were obtained through delineation analysis of Landsat satellite imagery from 1995 to 2020. Analysis of coastal traits was carried out based on land use and local lithology.  The results showed that ENSO, MJO, and IOD affected Badung Regency and Denpasar City when the Indonesian seas' temperature was higher than usual. La Nina, positive IOD, and an increase in the number of strong MJOs in Indonesian waters tend to increase the strength of shoreline destroying parameters such as tropical cyclones, rainfall, and waves. There is a weakening of the negative factor in the El Nino and IOD negative phases, shown by a decrease in the erosion value. The agricultural land use with sandy and limestone shoreline has a high amount of erosion. On the other hand, the young lithology of the quaternary era in the built-up area has a lower average decline.