艾比湖流域降水、地表水和地下水稳定同位素特征

doi:10.12118/j.issn.1000–6060.2021.04.06

Abstract

Abstract:

The study considered the precipitation, surface water, and groundwater of the Ebinur Lake Basin, Xinjiang, China as the research object. Combining the hydrogeological data, the temporal and spatial variation characteristics of hydrogen and oxygen isotopes of different water bodies in the basin were analyzed using field study, laboratory tests, and statistical analysis. The results show that: (1) the δ²H and δ¹⁸O of precipitation in the Ebinur Lake Basin range from -148.2‰ to -34.5‰ and -20.16‰ to 1.20‰, respectively. The slope of the local meteorological water line is 6.69, precipitation δ¹⁸O has a significant positive correlation with air temperature and a negative correlation with precipitation in summer. (2) Surface water δ²H and δ¹⁸O vary from -101.0‰ to -17.0‰ and -14.54‰ to 0.29‰, with the largest change in August, followed by May and October. The isotopic value of the Bortala River gradually increases from upstream to downstream, but the change in the trend of the Jinghe River is not obvious. δ¹⁸O is positively correlated with temperature and negatively correlated with altitude. Compared with river water, the isotopic values of lake water increase significantly in different seasons, reflecting the high evapotranspiration and concentration of lake water. (3) The groundwater δ²H and δ¹⁸O range from -85.0‰ to -65.5‰ and -12.18‰ to -9.05‰, respectively, and the average values are -75.5‰ and -11.00‰, respectively. The isotopic value of groundwater in the Bortala River region increases gradually from upstream to downstream, but it is not obvious in the Jinghe River region, which can be attributed to the different recharge sources and evaporation intensity in different sections of the river. The determination of stable isotopes in the Ebinur Lake Basin provides a basis for clarifying the hydrological process of the basin, which is of great importance for the effective use of water resources and the maintenance of ecological security in the face of environmental changes.

Key words: precipitation, surface water, groundwater, stable isotopes, Ebinur Lake Basin

HAO Shuai,LI Fadong,LI Yanhong,ZHU Nong,QIAO Yunfeng,TIAN Chao,YANG Han,FU Kai. Stable isotopes characteristics of precipitation, surface water and groundwater in Ebinur Lake Basin[J].Arid Land Geography, 2021, 44(4): 934-942.

Figures/Tables 10

Fig. 1

Tab. 1

Seasonal variation of precipitation δ2H and δ18Oin Ebinur Lake Basin /‰"

$δ$		春季	夏季	秋季	冬季
δ²H	均值	-96.6	-45.5	-103.0	-129.7
δ²H	范围	-98.4~-78.4	-63.1~-35.5	-132.7~-62.8	-148.2~-98.3
δ²H	均值	-12.33	-2.50	-11.31	-18.63
δ²H	范围	-12.89~-9.32	-5.94~1.20	-17.74~-5.64	-20.16~-14.38

Tab. 1

Fig. 2

Tab. 2

Seasonal variation of river water δ2H and δ18O in the Ebinur Lake Basin /‰"

$δ$		博尔塔拉河			精河			奎屯河			大河沿子河
$δ$		5月	8月	10月	5月	8月	10月	5月	8月	10月	5月	8月	10月
$δ H 2$	均值	-82.9	-75.4	-90.2	-85.6	-79.4	-88.8	-84.3	-77.4	-86.2	-80.2	-73.5	-88.6
$δ H 2$	范围	-96.1~ -75.0	-84.1~ -65.1	-101.1~ -80.9	-88.5~ -80.5	-81.2~ -75.8	-90.8~ -86.3	/	/	/	-85.1~ -77.0	-79.1~ -70.1	-92.1~ -82.9
$δ O 18$	均值	-11.77	-10.71	-12.81	-12.51	-11.61	-12.99	-11.32	-10.45	-11.55	-10.73	-9.76	-11.84
$δ O 18$	范围	-13.84 ~-9.61	-12.04~ -8.34	-14.54~ -10.97		-11.91~ -11.00	-13.21~ -12.52		/	/		-11.44~ -8.86	-13.54~ -10.64

Tab. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Tab. 3

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区段	5月		8月		10月
区段	关系式	R²	关系式	R²	关系式	R²
上游	δ¹⁸O=0.035T-12.728	0.04	δ¹⁸O=0.033T-12.147	0.02	δ¹⁸O=0.024T-13.133	0.03
中游	δ¹⁸O=0.256T-14.577	0.46	δ¹⁸O=0.148T-13.914	0.52	δ¹⁸O=0.239T-16.280	0.41
下游	δ¹⁸O=0.578T-19.211	0.55	δ¹⁸O=0.326T-18.682	0.62	δ¹⁸O=0.454T-20.412	0.75

Stable isotopes characteristics of precipitation, surface water and groundwater in Ebinur Lake Basin

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