Geomorphology and Landslide-Prone Area in Cisolok District, Sukabumi Regency

Abstract

Sukabumi District located in Southern West Java known as a region that has diverse natural characteristics, however, it is vulnerable to disasters, especially landslides. Moreover, this study focuses on Cisolok District because this region always occurred landslides every year due to topography aspect. The aim of this study is to analyze the influence of geomorphology to landslide-prone area in Cisolok District to reduce landslides. This study used overlay analysis for geomorphology mapping, while the Frequency Ratio (FR) method used for landslide-prone area mapping. Several physical variables used in this study such as slope, elevation, lithology, geological structure, road network, stream network, land use, soil type, rainfall, and landslide location. The result shows that the study areas have diverse geomorphology units dominated by volcanic slope with steep topography. While landslide-prone area consist of four classes : namely 17,03% low, 62,05% medium, 14,4% high, and 6,51% very high. Variety of landslide vulnerability in study area influenced by terrain form, land genesis, and geomorphic process.

A spatial study of landscape patterns in landslide-prone areas at cikakak sub-district, west java

“…Based on field observations, soil creep landslides occurred in wetland seasonal crops in a hilly terrain -mountainous landscapes that showed a small LPI value. This type of landslides usually occurs on slopes that have weak volcanic pyroclastic material such as in the study area [43,44] Meanwhile, a complex landslide can be caused by a quick clay event [43]. High rainfall intensity, associated soil types of brown latosol and yellowish-brown latosol which have a clay content of ≥ 40%, lithology that has low porosity or in other words, impermeable and sensitive to erosion allows these events to occur.…”

Landslide Surface Deformation Analysis Using Sbas-Insar in the Southern Part of the Sukabumi Area, Indonesia

“…Predominantly, the southern part of Sukabumi consists of an accumulation of alluvium deposits and coastal sediment deposits (Sugianti et al, 2016). Soil types in the study area consist of alluvial sulfic, andosol, cambisol, cambisol eutric, and podsolic haplic (Alfarabi et al, 2019). The study area has a medium to a high level of landslide susceptibility, which is impacted by physical factors of the location (geology, soil type, rainfall, land use, and geomorphology).…”

“…The study area has a medium to a high level of landslide susceptibility, which is impacted by physical factors of the location (geology, soil type, rainfall, land use, and geomorphology). Those factors increase the possibility for soil movements such as landslides (Alfarabi et al, 2019;Ristya et al, 2019;Sugianti et al, 2016). Based on Indonesian disaster information data obtained from https://dibi.bnpb.go.id/, 90 Landslides disasters occurred in the Sukabumi Regency from 2017 to 2020.…”

“…The surrounding area of the Sukabumi area, West Java, is one of the areas in Indonesia that frequently experiences disasters such as landslides, floods, and extreme weather (Damayanti et al, 2020). According to Alfarabi et al (2019), the terrain, types of bedrock, and geomorphic processes can cause variations in landslides in the Sukabumi area. Pelabuhanratu and Cisolok areas, as a part of the Sukabumi regency, have moderate to high levels of soil movement and landslide vulnerability (Alfarabi et al, 2019;Sugianti et al, 2016).…”

“…According to Alfarabi et al (2019), the terrain, types of bedrock, and geomorphic processes can cause variations in landslides in the Sukabumi area. Pelabuhanratu and Cisolok areas, as a part of the Sukabumi regency, have moderate to high levels of soil movement and landslide vulnerability (Alfarabi et al, 2019;Sugianti et al, 2016). In 2018, a relatively large landslide buried 30 houses in Cisolok District, Sukabumi Regency (BNPB, 2018).…”