Geo-statistical approach for prediction of groundwater quality in Chunnakam aquifer, Jaffna Peninsula

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dc.contributor.author Sutharsiny, A.
dc.contributor.author Herath, M.
dc.contributor.author Selvarajah, P.
dc.contributor.author Thushyanthy, M.
dc.contributor.author Meththika, V.
dc.date.accessioned 2021-08-18T11:33:16Z
dc.date.available 2021-08-18T11:33:16Z
dc.date.issued 2020
dc.identifier.citation Sutharsiny,A., Herath, M., Selvarajah ,P.,Thushyanthy, M. and Meththika,V.(2020).Geo-statistical approach for prediction of groundwater quality in Chunnakam aquifer, Jaffna Peninsula.Journal of jaffna science association.2(1):12-24. en_US
dc.identifier.uri http://drw.jfn.ac.lk/handle/123456789/138
dc.description.abstract Chunnakam aquifer is the main limestone aquifer of Jaffna Peninsula. The population of the Jaffna Peninsula depends entirely on groundwater resources to meet all of their water requirements. Thus for protecting groundwater quality in Chunnakam aquifer, data on spatial and temporal distribution are important. Geostatistics methods are one of the most advanced techniques for interpolation of groundwater quality. In this study, Ordinary Kriging and IDW methods were used for predicting spatial distribution of some groundwater characteristics such as: Electrical Conductivity (EC), pH, nitrate as nitrogen, chloride, calcium, carbonate, bicarbonate, sulfate and sodium concentration. Forty four wells were selected to represent the entire Chunnakam aquifer during January, March, April, July and October 2011 to represent wet and dry season within a year. After normalization of data, variogram was computed. Suitable model for fitness on experimental variogram was selected based on less Root Mean Square Error (RMSE) value. Then the best method for interpolation was selected, using cross validation and RMSE. Results showed that for all groundwater quality, Ordinary Kriging performed better than IDW method to simulate groundwater quality. Finally, using Ordinary Kriging method, maps of groundwater quality were prepared for studied groundwater quality in Chunnakam aquifer. The result of Ordinary Kriging interpolation showed that higher EC, chloride, sulphate and sodium concentrations are clearly shown to be more common closer to the coast, and decreasing inland due to intrusion of seawater into the Chunnakam aquifer. Also higher NO3− − N are observed in intensified agricultural areas of Chunnakam aquifer in Jaffna Peninsula. en_US
dc.language.iso en en_US
dc.subject Chunnakam aquifer en_US
dc.subject Groundwater quality en_US
dc.subject Geostatistics en_US
dc.subject Interpolation en_US
dc.subject IDW en_US
dc.subject Ordinary Kriging en_US
dc.title Geo-statistical approach for prediction of groundwater quality in Chunnakam aquifer, Jaffna Peninsula en_US
dc.type Journal Article en_US
dc.identifier.journal Journal of Jaffna Science association en_US


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