Spatial Analysis on Tsunami Predictions in Pandeglang Regency

Della Ayu Lestari(1*), Novi Sofia Fitriasari(2), Taufiq Ejaz Ahmad(3), Amien Rais(4), Dhea Rahma Azhari(5)

(1) Sistem Informasi Kelautan, Universitas Pendidikan Indonesia
(2) Sistem Informasi Kelautan, Universitas Pendidikan Indonesia
(3) Sistem Informasi Kelautan, Universitas Pendidikan Indonesia
(4) Sistem Informasi Kelautan, Universitas Pendidikan Indonesia
(5) Sistem Informasi Kelautan, Universitas Pendidikan Indonesia
(*) Corresponding Author

Abstract

Pandeglang Regency is an area that has the potentiel to be hit by tsunamis. The plate subduction paths of Indo-Australia and Anak Krakatau Volcano make Pandeglang Regency a region with a high tsunami potential. One step that can be taken to overcome and minimize losses is to do spatial planning to protect it against potential tsunami damage. This research aimed to evaluate the spatial area of Pandeglang Regency based on the identification of potential tsunami hazards.  The concept of modelling the tsunami inundation height developed by Berryman and based on Head Regulation No.4 of 2012 of the Indonesian National Board for Disaster Management has been used to identify potential tsunami hazards. The modelling was carried out by calculating the potential distribution of tsunami wave heights in coastal areas.  Three scenarios were used to estimate the distribution. The results showed that the first scenario predicted a maximum tsunami height   of 7.5 meters above sea level with the furthest tsunami inundation reaching 1,700.12 meters. Second scenario predicted maximum height of 15 meters, with the furthest tsunami inundation reaching 3,384.62 meters. Meanwhile, the last scenario was able to predict a height of 20 meters and showed the furthest tsunami inundation reaching 5.155,11 meters. These results proved that in all scenarios, the widest inundation would occur in Panimbang Regency. This is due to the relatively small variations in roughness and slope of the surface. The same condition also occurs in the last two scenarios, in which Sumur District was the area most ffected. Therefore, the spatial plan of Pandeglang Regency needs to be evaluated and the function of residential area changed to reduce and prevent large losses.

Keywords

Geography Information System; residential area; spatial analysis; tsunami; tsunami inundation

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DOI: 10.23917/forgeo.v35i1.12367

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