Zul Fadhli, Rosli Saad, M.M. Nordiana, N. Azwin, A.A. Bery
Karst environments are characterized by distinctive landforms which are related to dissolution and dominant subsurface drainage. The interaction of limestone with water able to create karst features such as cavity, pinnacle, boulder and sinkhole through the dissolution process. The existence of subsurface karst features are always be concern maters to engineers before any development start, because these features could cause disaster in the future. The study was conducted at Tapah, Perak (Malaysia) with the objective is to map karst features at limestone formation. The 14 survey lines of 2-D Electrical Resistivity Imaging (ERI) using the Wenner-Schlumberger array and the results were correlated with 14 boreholes. The inversion model shows that the study area is consisted of two main layers. The first layer with resistivity value >250 Ohm.m was interpreted as alluvium. The second layer is classified as hard layer with resistivity value of >350 Ohm.m. Each line has different range of limestone values because it's depending on the conductivity and density of the rock which influence by dissolution process. The karst features such as fill cavity, boulder, pinnacle, discontinuity and overhang were detected in the survey lines. The 2-DERI results showed a good correlation with all the borehole records in determining the subsurface of limestone formation. The 2-DERI method is capable in mapping karst features and bedrock depth. © 2015 ejge.
Geophysics Section, School of Physics, Universiti Sains Malaysia, Penang, 11800, Malaysia; Department of Geophysics Engineering, Faculty of Engineering, Syiah Kuala University, Banda Aceh, Indonesia
Research at a Glance
Register to unlock
Topics & SDG Alignment
Register to unlock
Collaboration
Register to unlock
Author Profile (Selected)
Register to unlock
References Overview
Register to unlock
Journal & Source
Register to unlock
Metadata & Integrity
Register to unlock