Identifying the subsurface profile for riverbank/bed filtration (RBF) using conventional methods such as drilled boreholes is usually labor intensive, costly and acquires only 1-D profiling. Hence, a 2-D ground resistivity method was used as an alternative to obtain a 2-D subsurface profile by extending 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 were executed at the site area. The Wenner-Schlumberger array protocol was applied for acquisition data process. The resistivity data were then processed and interpreted using RES2DINV software. The results show the approximate 2-D pseudo-section image of the subsurface resistivity distribution with different soil types. The interpretation of results reveals 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) belongs to the alluvial aquifer type and has a relatively high permeability, thus suitable for RBF. This method is believed to be able to give great assistance for selecting the suitable area for RBF in the future.
Potential soil characteristics for riverbank filtration using 2-D ground resistivity in Kota Lama Kiri, Kuala Kangsar
Mohd Firdaus Abdul Razak, Md Azlin Md Said, Rais Yusoh, Rosmyra Jasmi; Potential soil characteristics for riverbank filtration using 2-D ground resistivity in Kota Lama Kiri, Kuala Kangsar. Water Science and Technology: Water Supply 1 December 2016; 16 (6): 1477–1483. doi: https://doi.org/10.2166/ws.2016.064
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