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标题：Groundwater from Fractured Granite and Metasedimentary Rocks in the West Coast of Peninsular Malaysia
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作者：Nasiman Sapari ; Raja Zainariah Raja Azie ; Hisyam Jusoh 等
期刊名称：Pertanika Journal of Social Sciences & Humanities
印刷版ISSN：0128-7702
电子版ISSN：2231-8534
出版年度：2012
卷号：20
期号：2
出版社：Universiti Putra Malaysia
摘要：Hard rock formations consisting of granite and metasedimentary rocks in Peninsular Malaysia, have beenconsidered to be of poor aquifers. The map of shows the area underlain by hard rock as having poorto moderate potential for groundwater production (<230m3/well/day). This paper presents a finding ofproductive hard rock aquifers in the west coast of Peninsular Malaysia. Data from tubewell drillingscarried out for industrial water supply were analyzed. It was found that the hard rocks could yieldfresh water up to a maximum of 890m3/well/day. The wells were between 50 m and 200 m deep. Highdischarge rates of groundwater above 300m3/well/day were encountered from wells that penetrate majorfracture zones. The hard rocks are generally fractured at various depths. Groundwater in interconnectedfractures has a steady flow that sustains production during pumping tests and actual usage of the wells.This phenomenon indicates that the groundwater is being recharged by infiltration of rainwater throughthe overlying weathered rocks and soils. Tubewells in hardrock of West Coast of Peninsular Malaysiawere found to have an average discharge rates of 343m3/well/day. However, deep tubewells penetratedonly weathered granite, are generally non productive (<70m3/well/day). Limited fracture openings andrestricted recharge areas are likely to be the reason for the low discharge. Clay particles in fractureswere observed to be the factor for the low success rate and poor quality of the water particularly inmetasedimentary areas.
关键词：Discharge rates; groundwater; granite; sedimentary rocks; tubewells; usage