Evolution of coastal sandy aquifer system in Kalpitiya peninsula, Sri Lanka: sedimentological and geochemical approach

Jayasingha, Pathmakumara; Pitawala, H.M.T.G.A.; Dharmagunawardhane, H. A.

doi:10.1007/s12665-013-2885-y

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…Groundwater in Sri Lanka in different climatic zones is under serious threat mainly due to pollution occurring through agricultural activities and over extraction that causes a decline of groundwater levels and which resulted in salt water intrusion in the coastal belt (Panabokke and Perera 2005;Jayasingha et al 2014;Chandrajith et al 2014). Therefore, comprehensive hydrogeochemical studies are important to assess, identify and evaluate the chemical processes that affect the groundwater quality in tropical regions of Sri Lanka as the majority of the population depends entirely on the groundwater resources.…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of groundwater in different climatic zones of Sri Lanka

2015

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Sri Lanka is characterized by well-demarcated climatic zones based on the rainfall pattern known as wet zone, dry zone and intermediate zone. Groundwaters in these three zones are extracted mainly for drinking and irrigation from metamorphic hard rock aquifers and saprolite developed on metamorphic rocks. Detailed hydrogeochemical investigations were carried out covering these three climatic zones in order to characterize the groundwater. A total of 166 groundwater samples were collected representing three climatic zones and analyzed for their major and trace element geochemistry. The results indicate a clear difference in the geochemistry of groundwater between climatic regions, whereas semiarid dry zone groundwater is characterized with higher dissolved mineral contents compared that of the wet and intermediate zones.Low pH levels were noticed in the wet zone areas, while high calcium and fluoride contents were observed in the dry and intermediate terrains. Remarkably, high phosphate contents were observed in all three regions, indicating the influence of fertilizer application on groundwater. Particularly in the dry zone regions, the groundwater chemistry is mainly controlled by rock-water interactions and ion exchange processes in which high mineral contents are added from underlying metamorphic rocks to the drinking and irrigation water. The results indicate that groundwater in the dry zone area is under stress compared to other climate areas, but in the wet zone groundwater shows remarkable influence of anthropogenic activities.

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Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of groundwater in different climatic zones of Sri Lanka

2015

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“…People of both areas tend to extract groundwater on a large scale by constructing dug and tube wells into subsurface unconsolidated sandy and deep sedimentary limestone aquifers. The excessive groundwater usage has caused several detrimental environmental impacts, such as the depletion of groundwater table due to unregulated pumping (Water Resources Board, 2010) and deterioration of water quality due to saltwater intrusion and agrochemical usage (Kuruppuarachchi and Fernando, 1999;National Water Supply and Drainage Board, 2008;Jayasingha et al, 2011;Jayasingha et al, 2013;Jayasingha et al, 2014;Kumarasinghe and Rajapakse, 2013;Jayathunga et al, 2020). To cater solutions to the aforementioned issues, a general understanding of the physical regime and groundwater dynamics are necessary, which would depend on geology, land use, climate, and other environmental factors of the respective areas.…”

Section: Importance Of the Studymentioning

confidence: 99%

Assessment of hydrogeological scenario in a cross-section from Anamaduwa to Kalpitiya in Northwest Sri Lanka

et al. 2021

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The hydrogeological regime covering a section passing from Anamaduwa to the Kalpitiya peninsula in northwest Sri Lanka was examined to understand the groundwater flow across the metamorphic and sedimentary rock terrains. The study was conducted as a hydrogeological survey based on a structured questionnaire (n = 82) on the consumption, water level fluctuation, and water supply, supplemented by field examination of shallow dug (n = 20) and tube wells (n = 62). In Kalpitiya the average water level fluctuation was 3.44 m (vary from 2.95 to 6.39 m) while it was 6.27 m (vary from 2.25 to 8.52 m) in the Anamaduwa-Puttalam area. The drinking water supply in Kalpitiya was 24 hours per day irrespective of the dry or wet climate. However, in the Anamaduwa-Puttalam area, it was 14 hours during the dry period while it may extend up to 21 hours during the wet period. The average daily per capita domestic water consumption in the Kalpitiya area was 72.4 L while in the Anamaduwa-Puttalam area, it was 81.5 L. The EC of groundwater in the Anamaduwa-Puttalam area varies from 0.479 to 35.42 dS/m (average 3.336 dS/m) whereas the TDS varies from 319 to 23360 mg/L (average 2190 mg/L). However, in Kalpitiya peninsula EC varies from 0.339 to 5.980 dS/m (average 1.457 dS/m) whereas the TDS varies from 223 to 3847 mg/L (average 962 mg/L). Barring of groundwater flow through faulted basins in Andigama-Anamaduwa area and near the unconformity between Wanni complex and limestone belt are hydro-geologically responsible for the higher EC (>2.500 dS/m) and TDS (>2000 mg/L). Seawater intrusions along with sandy aquifers in the Kalpitiya peninsula are responsible for the EC/ TDS variations. Moreover, Kalpitiya indicates better prospects compared to landward areas. The outcome highlighted future water sector challenges in support of achieving the Sustainable Development Goal (SDG) target 6 in the study area.

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“…The first factor represents mainly the mineralization of water and hardness ( Table 5). The presence of nitrates in the F1 factor could translate a contamination of water by the organic matter coming from waste water 15 . The second F2 factor accounts for 17.74% of the original variance.…”

Section: Factorial Analysismentioning

confidence: 99%

Application of the Multivariate Statistical Analysis for Hydrogeochemical Assessment of Groundwater of Coastal Aquifer AQ1 of Pointe-Noire, Congo

2018

Chem Sci Trans

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Evolution of coastal sandy aquifer system in Kalpitiya peninsula, Sri Lanka: sedimentological and geochemical approach

Cited by 5 publications

References 34 publications

Geochemical characteristics of groundwater in different climatic zones of Sri Lanka

Geochemical characteristics of groundwater in different climatic zones of Sri Lanka

Assessment of hydrogeological scenario in a cross-section from Anamaduwa to Kalpitiya in Northwest Sri Lanka

Application of the Multivariate Statistical Analysis for Hydrogeochemical Assessment of Groundwater of Coastal Aquifer AQ1 of Pointe-Noire, Congo

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