DINAMIKA BENTUKAN LAHAN FLUVIAL AKIBAT SEDIMENTASI DI SUNGAI GRINDULU, SEGMEN ARJOSARI-PACITAN (Fluvial landform dynamics caused by sedimentation of Grindulu River, Arjosari-Pacitan Segment)

Arina Miardini

Abstract


Landforms experience dynamics during the geomorphological process. The fluvial process occurs due to the flow of water from erosion, erosion transportation, and sedimentation activities. Sedimentation material is resulted from erosion transported through the river. Later the deposited erosion will produce landform variations. Therefore, information of landform dynamic is important in controlling runoff and floods. The purpose of this study was to identify and determine the dynamics of the fluvial landform in Grindulu River, Arjosari-Pacitan Segment. The method used is combination of desk analysis and field surveys. The desk analysis is conducted to identify the types of landforms through visual interpretation of SPOT-7 Imagery, while field surveys are to determine sample units using purposive sampling. Based on landform analysis in the Arjosari-Pacitan Segment, there were five fluvial landforms processes due to sedimentation namely point bar, channel bar, flood plain, meandering, and natural levee. The dynamics that occur are dominated by the aggradation process, namely the addition of flood plain landform area of 0.872 ha (0.216%), channel bar of 0.091 ha (0.019%), and natural levee of 0.014 ha (0.002%). The identification of landforms can be used as a basis in spatial planning to optimize water system in watershed.


Keywords


landform; fluvial; sedimentation; Grindulu Watershed

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DOI: https://doi.org/10.20886/jppdas.2019.3.1.13-26

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