Identifying the subsurface profile for riverbank/bed filtration (RBF) using conventional method such as drilled boreholes usually labor intensive, costly and acquire only 1-D profiling. Hence, 2-D ground resistivity method was used as an alternative to obtain 2-D subsurface profile by extended to 200 m length at Kota Lama Kiri, Kuala Kangsar, Perak site area. Four resistivity survey lines (200 m each) with minimum electrode spacing of 5 m are executed at site area. The Wenner-Schlumberger array protocol was applied for acquisition data process. The resistivity data were then process and interpreted using RES2DINV software. The results show the approximate 2-D pseudo-section image of the subsurface resistivity distribution with different soil type. The interpretation results reveal that the site area consists of two main layers: (a) sand and gravel (300–750 Ωm) from 0 to 10 m depth, and (b) weathered rock (0–350 Ωm) within 10 to 40 m depth. It found that the first layer (0–10 m depth) are belongs to alluvial aquifer type and has a relatively high permeability thus suitable for RBF. This method is believe can give a great assist for selecting the suitable area for RBF on the future.
- 2-D ground resistivity
- soil characteristics
- subsurface profiling
- First received 7 January 2016.
- Accepted in revised form 4 April 2016.
- © IWA Publishing 2016