塔里木盆地绿洲带地下水咸化机制

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Abstract Durov diagram, PMF model, Gibbs diagram, ion ratio and saturation index method were used to analyze 1326 groundwater samples collected from 2016 to 2018, revealing the sources and driving forces of high salinity groundwater formation. The results showed that the proportion of brackish water and saline water in the oasis zone was 37.2% and 19.1%, respectively, and the hydrochemical type of groundwater was mainly SO₄-Cl. The continuous dissolution of evaporate rock such as halite and gypsum in brackish water, saline water, salt water and brine was the main driving factor for the formation of high salinity groundwater, which was also confirmed by the extremely significant positive correlation between Cl^-, SO₄^2-, Na⁺ and TDS (P<0.001), and between SI values of halite, gypsum and TDS(P<0.001). The poor groundwater dynamic conditions, fine-grained lithology and weakly alkaline hydrochemical environment in the alluvial plain area created favorable conditions for the enrichment of salts in groundwater, evaporation concentration and cation exchange were secondary factors in the formation of highly salinity groundwater. Due to the influence of human activities, high TDS phreatic water in confined groundwater areas infiltrated and recharged confined groundwater along the well wall, which was also a potential factor to intensify the salinization of deep groundwater.

Key words： groundwater hydrochemical characteristics salinity source salinization mechanism the oasis zone of the Tarim Basin

Received: 22 February 2023

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X523

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	Articles by authors
	LU Han
	ZENG Yan-yan
	ZHOU Jin-long
	SUN Ying
	MA Chang-lian

Cite this article:

LU Han,ZENG Yan-yan,ZHOU Jin-long等. Mechanism of groundwater salinization in the oasis zone of the Tarim Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5378-5389.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5378

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