Mapping the Spatial Distribution on Potential Erosion/Landslide and Analysing of Physical Soil Characteristics at Ir. H. Djuanda Forest Park, Bandung, West Java

• Main Author: HARDIANTO N. (NIM : 11512045), IQRA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28101
• Institution: Institut Teknologi Bandung

<p align="justify"> Forest Park Ir. H Djuanda is a natural conservation area of ± 520 ha which is one of the oldest forest park in Indonesia. This forest park is located across the city of Bandung, District Cimenyan and District Lembang, at the altitude of 770 - 1350 mdpl. In general, this area has steep slopes that can reach more than 40% steepness, especially near the track of Gua Belanda to Maribaya. The soil type in this area is classified as latosol with heavy rainfall (in average 2200 mm / year). These conditions have implications on high vulnerability to be endangered by erosion and landslides. This study aims to determine spatial Erosion Hazard (TBE) and analyze physical soil characteristics in landslide-prone areas compared with areas without landslides. Erosion Hazard (TBE) mapping uses ArcGIS computer application through Universal Soil Loss Equation (USLE) method. Soil sampling was sampled on erosion/landslide location points and areas without erosion/landslide along near the track of the Goa Belanda - Maribaya, followed by physical soil characteristics analysis in the laboratory. Samples of physical soil characteristics were taken from four plots without landslide and four landslide plots. The results showed that 68% of the area within Forest Park Ir. H Djuanda are classified as erosion hazardous from moderate to very heavy, from the TBE classification consisted of five classes, they are Very Light (11%), Light (14%), Medium (26%), Heavy (31%), and Very Heavy (11%) classes. These data indicate that in general the Forest Park Ir. H Djuanda area are dominated by erosion-prone and landslide-prone areas. The results from the physical soil characteristics examinations in comparison between the landslide and non-landslide areas are: (1) C-organic in the landslide area is generally low; (2) The texture on the non-landslide consist of loam and dusty loam, while the texture on the landslide plot consists of dusty loam, loam, and clay; (3) The general soil structure in both types of area is classified as sub-angular blocky (clump); (4) The permeability of the soils in the non-landslide plots were higher with permeability values 0.60 - 34.30 cm / hr compared with landslide plots ranging from 0.56 to 6.24 cm / hr; (5) The Bulk density in the landslide area are higher (1.52-1.68 gr / cm3) than the non-landslide area (1.19-1.58 gr / cm3); (6) water content level on non-landslide area are higher with 41,61 - 55,80% compared to landslide area wich is 38,58 - 48,28%; and (7) Soil porosity on landslide area is higher with the value of 40,48 - 54,93% compared to landslide area 36,46 - 42,45%. Based on these conditions it can be seen that these areas tend to have different physical soil characteristics between landslide and non-landslide areas. <p align="justify">