Preliminary Study of Rip Current Identification During West Monsoon In Parangtritis Coastal Area

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Abstract. Bantul Regency, as one of the five regencies in Yogyakarta Special Region, is strategically attractive for beach tourism which is visited by more than 1.6 million local and foreign tourists. Several famous beaches become tourist main destinations such as Parangtritis Beach, Parangkusumo Beach, and Depok Beach. However, the existence of rip currents spread along the shore has been threatening as danger for tourists. Rip currents can physically be characterized by the geomorphologic condition of the beach, i.e. cusps (horn like) morphology and sandbar shape (crescent moon or cresentic bar). Based on the data of SAR team in Parangtritis Beach, from January to December 2013, there were 39 casualties cases existed due to rip currents. Spatial information of rip currents distribution along the shore is particularly necessary to anticipate the number of victims then tourist could be informed the rip currents locations. This research explored the motion occurrences of rip currents within a year during west monsoon utilized middle and high resolutions imagery satellites. Wave parameters measurements were used as parameters for the methodology. The results showed that recorded wave period is about 11.17 ? 18.69 seconds with the maximum of wind speed reaches 11.3 m/s and the formation of waves is 3.96 m height. This research highlighted that Kretek coast has been the greatest potential to generate the rip current than other coasts in Bantul Regency due to the 3O of beach slope.

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