MORPHOMETRIC CHARACTERISTICS OF THE WAIRUHU RIVER WATERSHED IN QUARTERLY, TERTIARY, AND MESOZOIC AGED ROCKS IN THE FRAMEWORK OF ENCOURAGING ASPIRING GEOPARKS IN AMBON CITY, MALUKU PROVINCE Nabila Kalsum Tuanany -Emi Sukiyah - Ghazi Oktavidi Muslim - Dicky Muslim - Najmuddin Haikal Fikri
Department Geological Engineering, Geological Enginerring, Sumedang, Jatinangor
Abstract
Maluku Province is a region that does not yet have a serious geopark, due to the lack of research and publications that support the needs of a region in developing geoparks. Wairuhu watershed is located in Ambon City, Maluku Province. Research using the morphometric method is intended to determine the morphometric characteristics of the watershed and sub-watersheds in Quarternary, Tertiary, and Mesozoic rock with 8 sub-watersheds. The method used in this research is the calculation of Sub-Watershed Dimensions, Linear Morphometry, and Area Morphometry. Linear Morphometry uses the parameter of Branch Ratio (Rb), while the Morphometric Area uses the parameters of Drainage Density (Dd). Analysis of the result of dimension analysis show that the largest sub-watershed sequences are Mesozoic, Tertiary, and Quaternary age. The results of the calculation of the Branching Ratio (Rb) show that rivers are influenced by structure and some are not, large river branches are influenced by lithology with Rb values 2 - 6. Drainage Ratio (Dd) shows that tertiary-aged rocks have high permeability due to their lithology of volcanic breccias and tuffs with relatively mild resistance levels with Dd values 1.97 - 4.64. This geomorphic index data will help submit geopark assessments and supporting data for disasters.
Keywords: Aspiring Geopark, Wairuhu Watershed, Geomorphic Index, Age Rock, Education
