Sains Malaysiana 46(4)(2017): 537–543

http://dx.doi.org/10.17576/jsm-2017-4604-04

Soil Investigation at Wet World Hot Spring Complex for Future Development using Active Multichannel Analysis of Surface Waves

(Penyelidikan Tanah di Kompleks Mata Air Panas Wet World bagi Pembangunan Masa Hadapan menggunakan Analisis Pelbagai Saluran Aktif Gelombang Permukaan)

AMIN E. KHALIL¹*, MOHD NAWAWI¹, M. HARIRI ARIFIN^1,2,3, FATHI M. ABDULLAH^1,4,

J.S. KAYODE¹, NURADDEEN USMAN¹ & ARISONA¹

¹Geology Department, Faculty of Science, Helwan University, Egypt

²School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Pulau Pinang, Malaysia

³Geology Programme, Faculty of Science and Technology, Universiti Kebangsaan Malaysia

43600 UKM, Bangi, Selangor Darul Ehsan, Malaysia

⁴Geology Department, Faculty of Applied Science, Taiz University, Taiz 6803, Yemen

Diserahkan: 8 Mei 2016/Diterima: 9 September 2016

ABSTRACT

Development of hot spring touristic projects receives more interest in Malaysia in recent years since the country has a high potential of hot springs that are vital to the economy. However, such developmental activities could produce negative impacts if not accompanied with adequate knowledge of the subsurface conditions. Active multichannel analysis of surface waves (MASW) was applied to determine the subsurface shear wave velocities and Vs30. The inverted shear waves velocity models have then presented in both vertical cross-sectional plots and depth slices maps. Depth slices were chosen at about 5, 18.5 m and 32 m depths. Model obtained showed that the soil is stiffer near the highway side and turns to be softer as we go away in the scrub direction. Vs30 is also estimated and mapped to show the quality of the soil. Inverted parameters showed that the soil at the site ranges from soft soil to stiff one. Also, the result obtained proposed that the surface occurrence of the hot spring might be a result of intersection of faulted segments, where hot spring is located near the intersection points. Furthermore, the model helped in proposing a suitable for complex extension. The proposed is chosen such that it minimize any possible effects on the geothermal resources at the site.

Keywords: Hot springs; MASW; Pedas; shear wave velocity; soil properties

ABSTRAK

Pembangunan projek pelancongan mata air panas menerima minat yang lebih di Malaysia dalam beberapa tahun kebelakangan kerana negara mempunyai potensi tinggi daripada mata air panas yang penting kepada ekonomi. Walau bagaimanapun, aktiviti pembangunan ini boleh menghasilkan kesan negatif jika tidak disertakan dengan pengetahuan yang mencukupi tentang keadaan subpermukaan. Analisis pelbagai saluran aktif oleh gelombang permukaan (MASW) telah digunakan untuk menentukan kelajuan gelombang subpermukaan ricih dan Vs30. Model halaju gelombang ricih songsang ini telah dibentangkan dalam kedua-dua plot hirisan lintang menegak dan hirisan kedalaman peta. Hirisan kedalaman telah dipilih pada 5, 18.5 m dengan kedalaman 32 m. Model yang diperoleh menunjukkan bahawa tanah adalah lebih keras berhampiran lebuh raya tetapi bertukar lembut ke arah belukar. Vs30 juga dianggar dan dipetakan untuk menunjukkan kualiti tanah. Parameter songsang menunjukkan tanah di tapak ini berjulat daripada tanah lembut kepada tanah keras. Selain itu, keputusan yang diperoleh mencadangkan bahawa permukaan mata air panas ini mungkin terjadi hasil daripada persilangan segmen tersesar dengan mata air panas terletak berhampiran dengan titik persimpangan. Selain itu, model ini membantu dalam mencadangkan pengembangan kompleks yang sesuai. Cadangan ini dipilih kerana ia meminimumkan sebarang kesan pada sumber geoterma di tapak ini.

Kata kunci: Halaju gelombang ricih; MASW; mata air panas; Pedas; sifat tanah

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