气候变化领域集成服务门户(CCPortal): Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka

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DOI	10.1016/j.gsd.2024.101127
	Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka
	Athapattu, B. C. L.; Himanujahn, S.; Muhandiram, G. M. H. M.; Sandanayake, Sandun; Perera, W. L. G. D.; Bandara, W. D. C.; Edirisinghe, E. A. N. V.; Maeda, Morihiro; Vithanage, Meththika
发表日期	2024
ISSN	2352-801X
起始页码	25
卷号	25
英文摘要	The impact of precipitation and irrigation return flow on water quality and groundwater vulnerability was investigated in the Kala Oya basin, Sri Lanka using the Weighted Arithmetic Water Quality Index, DRASTIC Index, and isotope hydrology. Groundwater and surface water were analyzed for water quality parameters and stable isotopes (18O and 2H) in dry and wet seasons. In both seasons, neutral to alkaline water was observed. Electrical conductivity (EC) and major ions were higher in shallow (EC: 718.3 +/- 323.8 mu S/cm; Ca2+: 49.54 +/- 32.99 mg/L) and deep groundwater (EC: 708.1 +/- 321.5 mu S/cm; Ca2+: 37.06 +/- 11.21 mg/L) than in surface water (EC: 371.7 +/- 154.4 mu S/cm; Ca2+: 29.66 +/- 11.64 mg/L), while similar values of EC and major ions were reported in both shallow and deep groundwater samples. Ca-Mg-HCO3 was the dominant groundwater type which was derived from silicate and carbonate rock weathering. Observations in the wet season revealed delta 2H ranged from -47.97 to -16.71%o and delta 18O ranged from -7.56 to -2.87%o, while in the dry season, delta 2H ranged from -44.90 to -14.06%o, and delta 18O ranged from -7.69 to - 2.08%o. The enriched delta 18O and delta 2H groundwater values were mainly the result of progressive evaporative concentration of the heavier isotopes before water infiltration and groundwater recharge. The solute concentrations were enriched in groundwater by agricultural irrigation returns and associated evaporation indicating the influence of irrigation return flow on groundwater. It is suggested that agricultural practices increase groundwater vulnerability, which recommends special attention to long-term groundwater quality and quantity monitoring, hydrological modelling, land-use planning, and the development of sustainable policies in the basin.
英文关键词	Groundwater recharge; Stable isotopes; Precipitation; Water quality index; DRASTIC index
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:001219106500001
来源期刊	GROUNDWATER FOR SUSTAINABLE DEVELOPMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303434
作者单位	Open University Sri Lanka; Open University Sri Lanka; University Sri Jayewardenepura; Okayama University
推荐引用方式 GB/T 7714	Athapattu, B. C. L.,Himanujahn, S.,Muhandiram, G. M. H. M.,et al. Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka[J],2024,25.
APA	Athapattu, B. C. L..,Himanujahn, S..,Muhandiram, G. M. H. M..,Sandanayake, Sandun.,Perera, W. L. G. D..,...&Vithanage, Meththika.(2024).Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka.GROUNDWATER FOR SUSTAINABLE DEVELOPMENT,25.
MLA	Athapattu, B. C. L.,et al."Irrigation impact on water quality and aquifer vulnerability in Kala Oya basin, Sri Lanka".GROUNDWATER FOR SUSTAINABLE DEVELOPMENT 25(2024).