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ISPRS Int. J. Geo-Inf. 2018, 7(1), 20; doi:10.3390/ijgi7010020

Application of Geospatial Techniques for Groundwater Quality and Availability Assessment: A Case Study in Jaffna Peninsula, Sri Lanka

1
Department of Fisheries Science, Faculty of Science, University of Jaffna, Jaffna 40000, Sri Lanka
2
Graduate School of Life and Environmental Sciences, University of Tsukuba 1-1-1 Tennodai, Tsukuba 305-8572, Ibaraki, Japan
3
Department of Environmental Management, Faculty of Social Sciences and Humanities, Rajarata University of Sri Lanka, Mihintale 50300, Sri Lanka
4
United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-0065, Japan
5
Department of Agricultural Engineering and Soil Science, Faculty of Agriculture, Rajarata University of Sri Lanka, Anuradhapura 50000, Sri Lanka
6
Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda 10250, Sri Lanka
7
Faculty of Agriculture, University of Jaffna, Jaffna 40000, Sri Lanka
8
National Water Supply and Drainage Board, Regional Office, Jaffna 40000, Sri Lanka
9
Faculty of Fisheries & Ocean Science, Ocean University of Sri Lanka, Mahawela road, Tangalle 82200, Sri Lanka
*
Authors to whom correspondence should be addressed.
Received: 14 December 2017 / Revised: 29 December 2017 / Accepted: 6 January 2018 / Published: 12 January 2018
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Abstract

Groundwater is one of the most important natural resources in the northern coastal belt of Sri Lanka, as there are no major water supply schemes or perennial rivers. Overexploitation, seawater intrusion and persistent pollution of this vital resource are threatening human health as well as ecosystems in the Jaffna Peninsula. Therefore, the main intent of the present paper is to apply geospatial techniques to assess the spatial variation of groundwater quality and availability for the sustainable management of groundwater in the coastal areas. The electrical conductivity (EC) and depth to water (DTW) of 41 wells were measured during the period from March to June 2014, which represents the dry period of the study area. Surface interpolation, gradient analysis, a local indicators of spatial autocorrelations (LISA) and statistical analysis were used to assess the quality and availability of groundwater. The results revealed that the drinking and irrigation water quality in the study area were poor and further deteriorated with the progression of the dry season. Good quality and availability of groundwater were observed in the western zone compared to other zones of the study area. A negative correlation was identified between depth to water and electrical conductivity in the western zone. Hence, relatively deep wells in the western zone of the study area can be used to utilize the groundwater for drinking, domestic and agricultural purposes. The outcomes of this study can be used to formulate policy decisions for sustainable management of groundwater resources in Jaffna Peninsula. View Full-Text
Keywords: electrical conductivity; gradient analysis; interpolation; local indicators of spatial autocorrelations; groundwater; depth to water; Jaffna Peninsula electrical conductivity; gradient analysis; interpolation; local indicators of spatial autocorrelations; groundwater; depth to water; Jaffna Peninsula
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Gunaalan, K.; Ranagalage, M.; Gunarathna, M.H.J.P.; Kumari, M.K.N.; Vithanage, M.; Srivaratharasan, T.; Saravanan, S.; Warnasuriya, T. Application of Geospatial Techniques for Groundwater Quality and Availability Assessment: A Case Study in Jaffna Peninsula, Sri Lanka. ISPRS Int. J. Geo-Inf. 2018, 7, 20.

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