乌伦古河流域水体水化学与同位素特征及指示意义

doi:10.13866/j.azr.2021.06.01

Abstract

Abstract:

The hydrochemical and isotopic characteristics of water bodies are important indicators of hydrological processes. To ascertain hydrochemical and isotopic characteristics and reveal the relationship and formation mechanisms of different waters in the Ulungur River Basin, hydrochemistry and isotope datasets in 2018 were analyzed using mathematical statistics, Gibbs diagrams, ion ratios, and Piper diagrams. The results showed that hydrochemical composition of rivers was mainly affected by rock weathering, evaporation, and mixing. The river hydrochemical type was HCO₃·SO₄-Ca·Na and the lake hydrochemical type was SO₄·Cl-Na, which was mainly affected by evaporation. Groundwater was influenced by rock weathering, evaporation, and cation exchange. Phreatic water was HCO₃·SO₄-Ca·Na or SO₄·HCO₃-Na·Ca, while confined water was Cl·SO₄-Na. The Piper diagram of each water body showed surface water and phreatic water will further evolve toward Cl·SO₄-Na. The isotope values of different water bodies showed the following relationship: Ulungur Lake>Jili Lake>Ulungur River>phreatic water>confined water. Samples from the various water sources were scattered on both sides of local meteoric water line (δD = 6.49δ¹⁸O-8.63), which indicated isotopic composition was affected by evaporation and precipitation. Influenced by geology, geomorphology, and lithological structure of the strata, phreatic water was closely related to surface water and weakly to confined water. The river was mainly recharged by phreatic water, while local hydraulic connections existed between phreatic water and confined water.

Key words: Ulungur River basin, hydrochemistry, stable isotopes, formation mechanism, interaction relationship

TIAN Hua,XIN Tuo,LI Jinfang,YANG Jiayi,XIE Zufeng. Characteristics and indication of hydrochemistry and environmental isotopes of different water sources in the Ulungur River basin[J].Arid Zone Research, 2021, 38(6): 1497-1505.

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References 28

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水样类型		统计值	K⁺	Na⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	HCO₃^-	TDS	pH
水样类型		统计值	/(mg·L^-1)	/(mg·L^-1)	/(mg·L^-1)	/(mg·L^-1)	/(mg·L^-1)	/(mg·L^-1)	/(mg·L^-1)	/(mg·L^-1)	pH
地表水	乌伦古河 (R)	平均值	3.8	56.5	63.3	12.7	31.3	125.5	147.4	362.5	7.7
		主导离子	阴离子：SO₄^2-、HCO₃^-;阳离子：Na⁺、Ca²⁺
		水化学类型	HCO₃·SO₄-Ca·Na,SO₄·HCO₃-Ca·Na
	乌伦古湖 (WH)	平均值	47.6	609.1	61.9	68.5	419.8	756.2	417.5	2196.3	8.4
		主导离子	阴离子：SO₄^2-、Cl^-;阳离子：Na⁺
		水化学类型	SO₄·Cl-Na
	吉力湖 (JH)	平均值	18.7	265.9	69.5	33.4	182.1	357.3	254.2	1761.1	7.7
		主导离子	阴离子：SO₄^2-、Cl^-;阳离子：Na⁺
		水化学类型	SO₄·Cl-Na
地下水	潜水 (Q)	平均值	6.9	201.2	118.2	37.1	152.4	407.8	302.2	1091.6	7.3
		主导离子	阴离子：SO₄^2-、HCO₃^-;阳离子：Na⁺、Ca²⁺
		水化学类型	HCO₃·SO₄-Ca·Na,SO₄·HCO₃-Na·Ca
	承压水 (C)	平均值	3.5	380.5	69.5	64.2	379.3	550.9	187.6	1581.5	7.5
		主导离子	阴离子：Cl^-、SO₄^2-;阳离子：Na⁺
		水化学类型	Cl·SO₄-Na

统计值	δD/‰					δ¹⁸O/‰
统计值	潜水	承压水	河水	吉力湖	乌伦古湖	潜水	承压水	河水	吉力湖	乌伦古湖
最小值	-109	-137	-99	-67	-51	-13.8	-15.4	-13.4	-7.1	-4.6
最大值	-97	-108	-85	-62	-48	-12.1	-14.4	-10.2	-6.2	-3.9
平均值	-104	-120	-95	-65	-50	-13.3	-14.8	-12.2	-6.8	-4.3
标准差	4.1	12.8	3.3	2.2	1.1	0.8	11.9	1.3	0.4	1.3
变异系数	0.03	0.11	0.03	0.03	0.02	0.06	1.19	0.11	0.06	0.31

Characteristics and indication of hydrochemistry and environmental isotopes of different water sources in the Ulungur River basin

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