Hydrological interactions between surface water and groundwater in ancient manmade village tank cascade systems (VTCSs) in the dry zone of Sri Lanka

Sri Lanka, a tropical island, confronts climate-driven water scarcity and is of great concern to building climate-resilient water management to achieve UN SDGs 6 and 13. This study explores the dynamic interaction between surface water (SW) and groundwater (GW) in the dry zone of Sri Lanka, employin...

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Bibliographic Details
Published in:The Science of the total environment 2024-12, Vol.954, p.176526, Article 176526
Main Authors: Indika, Suresh, Hu, Dazhou, Wei, Yuansong, Yapabandara, Isuru, Athauda, Samadhi, Randika, Ashen, Prasad, Sangeeth, Cooray, Titus, Makehelwala, Madhubhashini, Zhong, Hui, Wang, Yawei, Jinadasa, K.B.S.N., Weragoda, Sujithra K., Weerasooriya, Rohan
Format: Article
Language:English
Subjects:
Climate-resilient
Hydrological interactions
Shallow groundwater
Stable isotopes
Tank cascade system (TCS)
Village tank
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Summary:Sri Lanka, a tropical island, confronts climate-driven water scarcity and is of great concern to building climate-resilient water management to achieve UN SDGs 6 and 13. This study explores the dynamic interaction between surface water (SW) and groundwater (GW) in the dry zone of Sri Lanka, employing a multi-tracer of dual stable isotopes (18O and 2H) and chloride. Two basins, Mahakanadarawa (MK) basin with numerous village tanks and tank cascade systems (VTCSs/TCSs) and Kawudulla (KW) basin serving as a control with a lack of tanks, were selected in this study. Results show that the presence or absence of TCSs emerges as a pivotal factor influencing regional water dynamics. Water quality (TDS and Cl−) in natural waters between the two basins was significantly different (ANOVA: p 
ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2024.176526