Detecting Springs in the Coastal Area of the  Gunungsewu Karst Terrain, Yogyakarta  Special Province, Indonesia, Analysis  using Fractal Geometry

Sari Bahagiarti Kusumayudha Sari Bahagiarti Kusumayudha

doi:10.12962/j20882033.v20i4.86

Detecting Springs in the Coastal Area of the Gunungsewu Karst Terrain, Yogyakarta Special Province, Indonesia, Analysis using Fractal Geometry

Sari Bahagiarti Kusumayudha Sari Bahagiarti Kusumayudha

Abstract

The Gunungsewu area is a karst terrain with water scarcity, located in the Yogyakarta Special Province, adjacent to the open sea of Indian Ocean in the South. Shorelines of the Gunungsewu southern parts show fractal geometry phenomenon, and there can be found some groundwater outlets discharging to the Indian Ocean. One of the coastal outlets exists at the Baron Beach.The amount of water discharge from this spring reaches 20,000 l/sec in wet season, and approximately 9000 in dry season. In order to find other potential coastal springs, shoreline of the south coast is divided into some segments. By applying fractal analysis utilizing air photo of 1 : 30,000 scale, the fractal dimension of every shore line segment is determined, and then the fractal dimension value is correlated to the existence of spring in the segment being analyzed. The results inform us that shoreline segments having fractal dimension (D) > 1.300 are potential for the occurrence of coastal springs.

Keywords

Karst terrain; water scarcity; fractal geometry; coastal spring

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DOI: http://dx.doi.org/10.12962/j20882033.v20i4.86

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