Delineation of temporal variability and governing factors influencing the spatial variability of shallow groundwater chemistry in a tropical sedimentary island

Lin, Chin Yik and Mohd Harun Abdullah, and Sarva Mangala Praveena, and Aminatul Hawa Yahaya, and Baba Musta , (2012) Delineation of temporal variability and governing factors influencing the spatial variability of shallow groundwater chemistry in a tropical sedimentary island. Journal of Hydrology, 432-433 . pp. 26-42. ISSN 0022-1694

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Official URL: http://dx.doi.org/10.1016/j.jhydrol.2012.02.015

Abstract

An attempt has been made to delineate the temporal variability and factors governing the shallow groundwater chemistry using analysis of variance (ANOVA) and multivariate analysis notably R-mode factor (FA) and hierarchical cluster analysis (HCA). Subsequently, geostatistical isoplethic maps were applied to convey better understanding on the distribution of selected groundwater parameters. The Manukan Island's shallow aquifer with sedimentary setting that constantly abstracted for freshwater supply has been selected for this study. One-way ANOVA suggested that neither changes of tide level nor rainfall volume appeared to exert significant influence on the groundwater chemistry of the small island. Rather, the groundwater chemistry was greatly governed by influence from seawater intrusion, which characterized by considerable amount of Ca, Na, and Cl. Such condition was well explained by a Piper diagram, where most plots were situated at the middle diamond shaped diagram, indicating mixing condition. FA likewise revealed that the shallow groundwater receives marked influence from carbonate dissolution and silicate weathering processes, especially boreholes located in the inland area. This can be clearly noted from the distinct groupings of relationships among different factors. HCA classified boreholes into three groups according to their locations in the coastal area, suggesting significant chemical variations between boreholes with distance from coast. Such distribution pattern was particularly evident in the isoplethic map. Overall, it appears that the shallow groundwater in the tropical island is not an appropriate source for drinking water in concern to its exceptionally high salinity and several elevated minor elements (Mn, Pb, and Se). For this, it is suggested that efforts in exploring other alternative sources should be performed outright.

Item Type:Article
Uncontrolled Keywords:Geostatistical contour map, Groundwater chemistry, Multivariate analysis, Seawater intrusion, Small tropical island, Temporal variability, Contour map, Groundwater chemistry, Multi variate analysis, Temporal variability, Tropical island, Analysis of variance (ANOVA), Aquifers, Chlorine, Cluster analysis, Coastal zones, Groundwater resources, Hierarchical systems, Lead, Manganese, Multivariant analysis, Salt water intrusion, Sedimentology, Sodium, Tropics, Weathering, Hydrochemistry, Borehole, Cluster analysis, Contour map, Drinking water, hydrogeochemistry, Multivariate analysis, Saline intrusion, shallow water, Small island state, Spatial variation, Temporal variation, Variance analysis, Volume
Subjects:?? GB1001-1199.8 ??
Divisions:SCHOOL > School of Science and Technology
ID Code:5583
Deposited By:IR Admin
Deposited On:10 Dec 2012 16:08
Last Modified:18 Feb 2015 12:25

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