Erodibility Factor in Weathered Volcanic Rock in Jatinangor, West Java, Indonesia

International Conference on SMART CITY Innovation 2018

Khoirullah, N.^1 ; Sophian, I.^1

Department of Applied Geology, Faculty of Geological Engineering, Universitas Padjadjaran, Jl. Raya Bandung Sumedang KM.21, Hegarmanah, Jatinangor, Sumedang District, West-Java

45363, Indonesia^1

关键词: Erodibility;    Erosion predictions;    Grain size distribution;    Jatinangor;    Regional development;    Undisturbed sample;    Volcanic materials;    Water infiltration;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/248/1/012055/pdf
DOI  :  10.1088/1755-1315/248/1/012055

来源: IOP

【 摘 要 】

A regional development will decrease the open green space that will affect the less water infiltration during the rainy season and causing the high intensity of the erosion rate. Jatinangor is a well-known new satellite city that located in undulating volcanic hills as the part of the Southeast Mt Manglayang. This area has been degraded from agricultural land into the residential and educational area. This study aims to determine the erodibility factor potential as one of the important factors to an erosion prediction. The data were obtained by collecting several undisturbed samples and tested the grain size and hydrometer analysis, atteberg limit test to know the grain size distribution. This result showed that Jatinangor Area has a high potential value of erodibility that caused by the silt domination and Ilite clay mineral that potential to swelling. The high erodibility values are affected by volcanic material as the parent rock that consists of Tuff, Lapilli Tuff, Grain supported and matrix supported Breccia with Plagioclase and K-Feldspar percentage 15-35%. Whereas the low erodibility value in the higher clay soil percentage is affected by the less percentage of plagioclase and K-fledspar, and the Tuffaceous sand matrix that difficult to erodible. The conservations are needed to decrease the erodibility effect and minimize the erosion rate annual.