Variation of Surface Soil Characteristics in Landslide Deposition Areas Based on Landslide Activities and Slope Position in Bompon Sub-Watershed, Magelang

Abstract

The physical characteristics of the surface soil are the crucial soil characteristics related to landslides. They can cause landslides and change due to landslides. The physical characteristics of the surface soil in agricultural land play an important role in providing nutrients and as a medium for plant growth. Landslide activities and slope position can change soil characteristics significantly. Studies on the physical characteristics of surface soil in landslide deposition areas have been studied previously, however most of those studies are not discussed yet in regarding with relation of this landslide deposition and agricultural land. The purpose of this study is to characterize and examine the variation of physical characteristics of the surface soil in landslide deposition areas among different landslide activities and slope positions. The method used in this study was purposive sampling based on landslide activities (active, inactive) and slope position (upper-, middle-, and lower slope). Soil samples were taken on the landslide deposits with a depth of 0-30 cm. Soil samples were 11 variations. The results showed that the physical characteristics of surface soil based on landslide activities or slope position were fine texture or clay; particle density, bulk density, and porosity were uniform; high atterberg numbers; slightly slow permeability; and low c-organic as well as organic matter content. Variation of the physical characteristics of surface soil showed high values on active landslides and lower slopes. The most influenced soil property due to landslide activities and slope position was soil permeability.

Landslide Movement of Bendungan District Trenggalek Using an Artificial Neural Network

“…In depth information analysis aims to describe the characteristics of the soil and is associated with the results of field observations during the process of making a landslide inventory map. Based on the results of the identification of texture and wrinkle-swelling / COLE values, there is an alignment or relationship between these two parameters of physical properties of the soil (Sari et al, 2022). The materials were dominated by silt and clay fractions, while the sand fraction has a small percentage value, indicating that the soil condition has a moderate wrinkle development value.…”