Determination of Soft Lithology Causes The Land Subsidence in Coastal Semarang City by Resistivity Methods

3rd International Conference on Tropical and Coastal Region Eco Development 2017

地球科学;生态环境科学

Widada, Sugeng^1 ; Saputra, Sidhi^1 ; Hariadi^1

Department of Oceanography, Faculty of Fisheries and Marine Sciences, Diponegoro University, Jl. Prof. H. Soedarto, SH, Tembalang, Semarang

50275, Indonesia^1

关键词: Alluvial deposits;    Electrode configurations;    Housing sectors;    Land subsidence;    Resistivity methods;    Semarang;    Vertical distributions;    Vertical resolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/116/1/012092/pdf
DOI  :  10.1088/1755-1315/116/1/012092

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Semarang City is located in the northern coastal plain of Java which is geologically composed of alluvial deposits. The process of the sediment diagenesis has caused a land subsidence. On the other hand, the development of the industrial, service, education and housing sectors has increased the number of building significantly. The number of building makes the pressure of land surface increased, and finally, this also increased the rate of land subsidence. The drilling data indicates that not all layers of lithology are soft layers supporting the land subsidence. However, vertical distribution of the soft layer is still unclear. This study used Resistivity method to map out the soft zone layers of lithology. Schlumberger electrode configuration with sounding system method was selected to find a good vertical resolution and maximum depth. The results showed that the lithology layer with resistivity less than 3 ohm is a layer of clay and sandy clay that has the low bearing capacity so easily compressed by pressure load. A high land subsidence is happening in the thick soft layer. The thickness of that layer is smaller toward the direction of avoiding the beach. The improvement of the bearing capacity of this layer is expected to be a solution to the problem of land subsidence.