The effect of major faults and folds in hard rock groundwater potential mapping: An example from Langat Basin, Selangor

Abstract

Together with other factors, geological factors such as lithology, bedding, fractures (lineaments), faults and folds playa very significant role in the movement and accumulation of groundwater in hard rock terrain. However, in most cases of groundwater potential mapping, only the role of lithology and lineaments are considered together with other non-geological factors. This paper will demonstrate the effect of faults and folds in groundwater potential mapping by using remote sensing and the geographic information system integration method. By incorporating faults and folds in the study, zones of groundwater potential become more focussed and well defined as compared to the result when only lithology and lineaments are considered. It is hoped that the derived ground water potential zonation map will be useful for further work in groundwater exploration of a selected area. Abstrak: Di samping faktor lain, faktor geologi seperti jenis litologi, perlapisan batuan, retakan (lineamen), sesar dan lipatan berperanan daripada segi pergerakan serta pengumpulan air tanah dalam terain berbatuan. Walau bagaimanapun, kebanyakan kajian tentang pemetaan potensi air tanah hanya mengambil kira faktor litologi dan juga lineamen di samping faktor bukan geologi yang lain. Kertas ini mempa:merkan kesan atau pengaruh faktor sesar dan lipatan dalam pemetaan potensi air tanah menggunakan kaedah integrasi penderiaan jauh dan sistem maklumat geografi. Kajian ini mendapati bahawa penzonan kawasan berpotensi air tanah lebih jelas dan terfokus jika dibandingkan dengan kajian yang hanya mengambil kira faktor litologi dan lineamen. Peta penzonan potensi air tanah yang terhasil diharapkan akan lebih membantu serta memudahkan kerja-kerja eksplorasi air tanah selanjutnya.