the 8th South East Asia Design Research (SEA-DR) - UNESA 2020, The 8th SEA DR and the 2nd STEACH international Conference 2021

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GEOMORPHOLOGICAL MAPPING OF THE PRAMBANAN HILLS YOGYAKARTA
Nugroho Hari Purnomo

Last modified: 2021-11-27

Abstract


Prambanan Subdistrict, Sleman Regency, Yogyakarta, and its surroundings have experienced quite rapid regional development. One of the drivers of regional development is the construction of an alternative road connecting Prambanan with Gunung Kidul Regency which is connected to the Yogya Solo toll gate. The development will cross the Prambanan hills area. To anticipate further regional development, it is necessary to study the characteristics of the land. Understanding the geomorphological conditions of an area becomes the basis for land studies to support regional development. This study aims to identify the geomorphological characteristics of the Prambanan hills area. The research method is based on the main unit of analysis for the survey, namely the geomorphological unit used for the field survey. Geomorphological units are composed of overlapping lithological units, landforms, and slopes. The research work steps include pre-mapping, field-mapping, and post-mapping steps. The analysis carried out is spatial analysis in the form of map presentations and descriptions of morphography, morphometry, and passive morphostructure. The results showed that on a map scale of 1: 50,000, two landforms could be identified, namely hills and danudational and structural escarpments. For lithology, three rocks can be identified, namely the Kebo Butak sandstone unit, the Semilir lapilli unit, and the Semilir tuff unit. Slopes can be identified in all classes, namely 0-8%, 8-15%, 15-25%, 25-45%, and >45%. The results of the combination of these three elements produced 9 geomorphological units. The 9 are the Semilir denudation hills rocked with lapilli with a slope of 15-25%, the denudation hills with Semilir lapilli rock with a slope of 25-45%, Kebo Butak sandstone hills with a slope of 8-15%, the denudation hills with sandy Kebo Butak with slopes 15-25%, Kebo Butak sandy hills with a slope of 25-45%, Semilir danudasional hills with 15-25% slopes, Semilir tuff hills with 25-45% slope, structural escarpment with Semilir lapilli with 25 slopes -45%, and the Semilir lapilli-rock structural escarpment with a slope of >45%.


Keywords


geomorphology; hills; Prambanan