Geographia Technica, Vol 21, Issue 2, 2026, pp. 119-131
MULTI-TEMPORAL SATELLITE ANALYSIS OF MORPHODYNAMIC CHANGE IN THE PERANCAK SANDSPIT, BALI, INDONESIA
Adzkia Noerma ARIFA 
, Bayu MUNANDAR , Amir Yarkhasy YULIARDI
ABSTRACT: Perancak Sandspit, located in Jembrana Regency, is one of the coastal landforms on the southwest coast of Bali, Indonesia. It is a large hook-shaped sandspit that experienced morphodynamic change between January 2024 and January 2025. The results reveal three periods of sandspit shortening and one period of sandspit elongation. During the first period, January to March 2024, and the third period, July to September 2024, the sandspit experienced shortening at a rate of about 0.3 meters/day. The second period, April to June 2024, was the only period of sandspit elongation with a rate of 0.59 meters/day. Although the sandspit elongated, its width remained unchanged from the first period at 150 meters. Conversely, in the fourth period, October 2024 to January 2025, the sandspit shrank significantly at a rate of 1.16 meters/day, with a concurrent decrease in width. In addition, in the first and fourth periods, changes in the direction of the distal end of the Perancak sandspit were observed, which were pushed toward the east-northeast. The result indicates that the longshore sediment transport rate during the elongation phase is around 104,000 m3/year. Although the Perancak sandspit exhibits fluctuations in morphology and geometry, its overall characteristics in January 2025 remained similar to those observed in January 2024. It indicates recurring morphological and geometric variations of the Perancak sandspit.
Keywords: Sandspit; Morphodynamic change; Multi-temporal; Longshore sediment transport rate; Bali.
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