Quantification of groundwater–seawater interaction in a coastal sandy aquifer system: a study from Panama,Sri Lanka     

Rohana Chandrajith  Dinusha Chaturangani  Sumith Abeykoon  Johannes A. C. Barth  Robert van Geldern  E. A. N. V. Edirisinghe  C. B. Dissanayake 《Environmental Earth Sciences》2014,72(3):867-877

The Panama coastal aquifer system is an important water resource in the southeast coast of Sri Lanka that provides adequate supplies of water for agriculture and domestic uses. One of the biggest threats to these fragile aquifers is the sea water intrusion. In this study, recharging mechanism and geochemical evaluation of groundwater in the coastal sandy aquifer of Panama were evaluated using chemical and stable isotope techniques. Thirty groundwater samples were collected and analyzed for their major ion concentrations and stable isotope ratios of oxygen (¹⁸O/¹⁶O) and hydrogen (D/H). All studied samples showed a ranking of major anions in the order Cl^? > HCO ₃ ^?  > SO ₄ ^2?  > N-NO₃ ^? while cations showed a decreasing order of abundance with Na⁺ > Ca²⁺ > Mg²⁺ > K⁺. Dominant groundwater hydrogeochemical types were Na–Cl and mixed Ca–Mg–Cl. Results of saturation index calculations indicate that the investigated groundwater body was mostly saturated with respect to calcite, dolomite and gypsum. In addition, stable isotope and geochemical data suggest that fresh groundwater in the aquifer is recharged mainly by local precipitation with slight modification from evaporation and saline water intrusions. Isotope data suggest that mixing of salt water with freshwater occurs in aquifers which are located towards the lagoon. Since the communities in the study area depend entirely on groundwater, an understanding of the hydrogeochemical characteristics of the aquifer system is extremely important for the better water resource management in the region.  相似文献   

Monsoon-Driven Geomorphological Changes Along the West Coast of Sri Lanka: A Combined Approach Utilizing ‘CoastSat’ and Google Earth Engine     

Gunasinghe  Gunasinghage Prasadh  Ratnayake  Nalin Prasanna  Ratnayake  Amila Sandaruwan  Samaradivakara  G. V. I.  Dushyantha  Nimila Praneeth  Jayaratne  Ravindra  Dinusha  Kodithuwakka Arachchige  Silva  Akalanka 《Ocean Science Journal》2022,57(3):475-492

Ocean Science Journal - Long-term field monitoring of shoreline changes is time-consuming, expensive, and labor-intensive. Instead, satellite images can be used as an alternative method to collect...  相似文献