Allogenic River in Hydrogeological System of Gremeng Cave, Gunungsewu Karst Area, Java Island, Indonesia Ahmad Cahyadi, Eko Haryono, Tjahyo Nugroho Adji, M Widyastuti, Indra Agus Riyanto, Muhammad Naufal
Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada
Abstract
Allogenic rivers play an important role in the development of karstic areas. The open system of allogeneic rivers allows aggressive conditions to dissolve limestone, so recharging from allogenic rivers will cause more intensive rock dissolution and possibly form a major underground river system in a hydrogeological system in karst area. This study aims to inventory allogenic rivers in the Gremeng Cave hydrogeological system and analyze its type based on the geological conditions that caused it to form. The study was conducted by analyzing the map of the topographic map of Indonesia (Peta Rupa Bumi Indonesia), geological maps and high-resolution remote sensing imagery. In addition, a detailed geological survey was conducted to analyze the causes of allogenic rivers at the study site based on their geological and geomorphological characteristics. The results of the study show that there are at least 5 allogenic river sub systems that combine to become one of the main allogenic river systems. The allogenic river types that emerge are allogeic from underlying beds exposed updip. The emergence of allogenic rivers at the contact of tertiary volcanic rocks and limestones in the Gunungsewu Karst Area.
Keywords: Karst, Allogenic River, Gunungsewu Karst Area, Gremeng Cave
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