Research on stable isotope characteristics and recharge relationship of the main river on the southern slope of Qilian Mountains

doi:10.7522/j.issn.1000-694X.2020.00085

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (6): 151-161.DOI: 10.7522/j.issn.1000-694X.2020.00085

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Research on stable isotope characteristics and recharge relationship of the main river on the southern slope of Qilian Mountains

Fang Liu¹(), Guangchao Cao¹(), Shengkui Cao¹, Yufan Yang²

^1.School of Geographical Sciences / Qinghai Provincial Key Laboratory of Physical Geography and Environmental Processes / MOE Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation，Qinghai Normal University，Xining 810008，China
^2.School of Geography and Tourism，Shaanxi Normal University，Xi’an 710119，China

Received:2020-09-23 Revised:2020-11-03 Online:2020-12-09 Published:2020-12-09
Contact: Guangchao Cao

Abstract

Abstract:

Affected by climate change and human activities， the runoff process in arid alpine regions has undergone significant changes， and complex hydrological processes has an impact on the distribution pattern of water resources throughout the northwest inland region. Takes the southern slope of Qilian Mountains in China as an example， The paper uses the spatial isolation method and the δD-δ¹⁸O linear relationship method to analyse hydrogen and oxygen isotopes characteristics and spatial distribution of the Datong River， Yeniugou River， Babao River， and Tuole River on the southern slope of Qilian Mountains in August 2018 and August 2019. What’s more， the End-member Mixing model was used to estimate the recharge ratio of different water sources to the river， It is revealed that：（1） The δ¹⁸O and δD value of the four rivers on the southern slope of the Qilian Mountains range from -10.02‰ to -6.35‰, -61.05‰ to -38.11‰, respectively. The average values are -8.38‰ and -49.91‰ respectively， and the d-excess values are greater than the global average deuterium surplus of rainwater by 10‰. （2） The middle and upper reaches of the Datong River are mainly recharged by rainfall， and the recharge ratio is 80.8%； the middle and lower reaches are recharged by groundwater， and the recharge ratio is 67.4%. The recharge sources of Yeniugou river are mainly precipitation and well water， accounting for 40.9% and 53.9% respectively； The upper reaches of Babao River are mainly affected by precipitation and well water， and the downstream is mostly affected by well water. The rainfall and groundwater recharge ratios in the Tuole River are 46.9% and 53.1%， respectively. The influx of different water sources is the main reason why the hydrogen and oxygen stable isotopes of river waters are different in the headwaters basin of the southern slope of the Qilian Mountains， precipitation and groundwater are major recharge sources of river water.

Key words: river water, stable hydrogen and oxygen isotopes, spatial distribution, recharge relationship, southern slope of Qilian Mountains

CLC Number:

P342

Fang Liu, Guangchao Cao, Shengkui Cao, Yufan Yang. Research on stable isotope characteristics and recharge relationship of the main river on the southern slope of Qilian Mountains[J]. Journal of Desert Research, 2020, 40(6): 151-161.

Figures/Tables 8

Fig.1 Location of the study area and distribution of the sampling sites

Table 1 Hydrogen and oxygen stable isotopic composition in main river

类型	δ¹⁸O/‰			δD/‰
类型	平均值±标准差	最大值	最小值	平均值±标准差	最大值	最小值
大通河水	-8.07±0.71	-10.02	-6.35	-48.61±3.96	-61.05	-38.11
野牛沟河水	-8.75±0.52	-9.73	-7.75	-51.45±2.77	-58.19	-45.22
八宝河水	-8.79±0.59	-9.95	-7.89	-50.72±3.45	-56.67	-43.16
托勒河水	-8.58±0.53	-10.01	-7.75	-51.83±2.49	-57.83	-48.13

Fig.2 Relationship between δ18O and δD in different rivers

Fig.3 Variation of δ18O along main stream of river water on the southern slope of Qilian Mountains

Fig.4 Relationship between δ18O、δD and altitude in the main stream of river water on the southern slope of Qilian Mountains

Fig.5 Spatial interpolation fitting distribution map and trend analysis of δ18O value in Yeniugou River, Babao River, Tuole River, and Datong River

Fig.6 Recharge relationship of main rivers on the southern slope of Qilian Mountains

Fig.7 Recharge ratio of main rivers on the southern slope of Qilian Mountains

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Research on stable isotope characteristics and recharge relationship of the main river on the southern slope of Qilian Mountains

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