Syah, Aminudin and Siregar, Amril Ma'ruf and Riki Chandra Wijaya, Riki Potential hazard analysis and mechanism of landslide and debris flow in Semaka, Tanggamus. International Conference Proceedings (AIP). (Submitted)

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Abstract

According to the Tanggamus Regional Disaster Management Agency, debris flow and landslides floods occurred three times throughout 2020 in Semaka, namely on January 10, August 5, and September 30, 2020. This landslide and debris flow destroy 483 houses and at least 300 hectares of farm fields. The phenomenon of debris flow was a recurring event because the efforts to reduce disaster risk have not been optimal. This study aims to provide data/information on field surveys, hydrological analysis, geotechnical investigation, and mitigation techniques to reduce the disaster risk. This research begins with a preliminary investigation, field survey, and data collection. The study aims to analyze and estimate the impact of landslide and debris flow risk. This study was conducted to determine the mechanism and causes of debris flow, landslides that preceded, and the potential hazard of debris flow and landslides in the future. Based on the study result and analysis, landslides that occur along the flow path are controlled by the geological conditions of the soil and rock layer. The soil layer consists of montmorillonite clay on the bedrock in the form of breccia andesite that is very susceptible to move when triggered by water. This Lanslide moves down the slope towards the river and transforms into a debris flow that carries landslide material in the form of soil, boulder, trees, and water. In addition, landslides can also block the flow path and become natural dams that at any time transform into fast floods. The potential landslides that can transform into debris flows or flash floods require structural mitigation efforts on unstable slopes.

Item Type: Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Fakultas Teknik (FT) > Prodi Teknik Sipil
Depositing User: Aminudin Syah
Date Deposited: 11 Nov 2021 02:34
Last Modified: 11 Nov 2021 02:34
URI: http://repository.lppm.unila.ac.id/id/eprint/35864

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