Sains Malaysiana 51(8)(2022): 2735-2743

http://doi.org/10.17576/jsm-2022-5108-30  

Penentuan Jenis Akuifer di Kota Belud, Sabah menggunakan Kaedah Seismik Pantulan

(Determination of Aquifer Type at Kota Belud, Sabah using Seismic Reflection Method)

FATIN NABILAHUDA ISMAIL¹, NORSYAFINA ROSLAN^1,*, JAINEH LINGI², UMAR HAMZAH¹ & NORASIAH SULAIMAN¹

¹Jabatan Sains Bumi dan Alam Sekitar, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Jabatan Mineral dan Geosains Malaysia, 88999 Kota Kinabalu, Sabah, Malaysia

Received: 13 March 2022/Accepted: 29 April 2022

  Abstrak

Punca air amat penting bagi kegunaan harian dan kegiatan ekonomi pertanian. Bekalan air bersih di kawasan Pantai Barat Kota Belud, Sabah terhad terutamanya sewaktu musim kemarau. Oleh itu, air bawah tanah boleh dijadikan sebagai punca bekalan air alternatif. Satu kajian telah dijalankan bagi menentukan jenis akuifer di Pantai Barat Kota Belud untuk tujuan ini. Berdasarkan cerapan lapangan pada singkapan yang dijumpai di Kampung Piasau dan analisis log lubang gerudi di Kampung Ratau, kawasan kajian terdiri daripada selang lapis batu pasir dan syal. Gabungan kaedah pemetaan profil luluh hawa dan seismik pantulan menggunakan teknik pemprofilan titik tengah sepunya (CMP) menunjukkan akuifer di kawasan kajian adalah jenis akuifer batu pasir teretak yang boleh mencecah ketebalan sehingga 300 m. Kehadiran kekar pada singkapan batu pasir yang mempunyai gred luluh hawa II hingga IV dan struktur sesar normal dan sesar sungkup di bahagian subpermukaan (melalui pentafsiran data seismik pantulan di Kampung Piasau dan Kampung Kalibungan) telah meningkatkan keliangan dan ketertelapan batu pasir sebagai akuifer. 

Kata kunci: Akuifer teretak; batu pasir; Kota Belud

Abstract

Water resources are very important for daily use and agricultural economic activities. Clean water supply in the West Coast of Kota Belud, Sabah is limited especially during the drought season.  Therefore, groundwater is proposed to be used as an alternative source of water supply. A study has been carried out to determine the type of aquifer on the West Coast of Kota Belud area for this purpose. Based on the field observation on the outcrop of Kampung Piasau and analysis of boreholes in Kampung Ratau, the study area comprises of interbedded sandstone and shale layers. The combination of weathering profile mapping and seismic reflection method using Common Midpoint Profiling (CMP) technique showed that the aquifer of the study area is classified as fractured sandstone aquifer (up to 300 m thick). The presence of joints in the grade II to IV weathered sandstone outcrops, and the normal and reverse faults structures (derived from seismic reflection that showed in the subsurface data in Kampung Piasau and Kampung Kalibungan), have increased the porosity and permeability in sandstones as an aquifer.

Keywords: Fractured aquifer; Kota Belud; sandstone

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^*Corresponding author; email: finalan@ukm.edu.my