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Water resources in inland regions of central Asia: Evidence from stable isotope tracing.
- Source :
-
Journal of Hydrology . Mar2019, Vol. 570, p1-16. 16p. - Publication Year :
- 2019
-
Abstract
- Highlights • Building spatial patterns of stable isotope of water cycle in inland region. • Finding water transformation of inland region. • Cryosphere belt contributes to about 80% of water resources in inland region. • Recycling moisture contributes 78 mm to precipitation in inland region. • Ecological conservation would be effective for reliable water supply. Abstract Complex hydrological processes affect valuable water resources in inland regions across arid central Asia. Historically, this was a critical part of the Silk Road, and it is now named the modern Silk Road Economic Belt. Using the Qilian Mountains and Hexi Corridor in China as a case-study of the inland region, we collected a total of 2311 water samples from the area and performed a comprehensive investigation of the water cycle. Results from stable isotope tracing indicate clear spatial patterns. In the upstream mountainous regions, glacier snow meltwater becomes groundwater at the periglacial belt. Supra-permafrost water develops into river runoff in the permafrost region. There are also frequent exchanges between groundwater and river runoff along the vegetation belt. In the middle/downstream region, river runoff becomes groundwater. Throughout these processes, both river runoff and groundwater are consumed by evapotranspiration, are recycled, and make a substantial contribution to precipitation. Overall, the upstream mountainous region is a critical part of the water resources. The cryosphere belt accounts for 44% of the mountainous region but contributes to about 80% of water resources. Recycling of moisture also plays an important role. During the summer months (May to September) moisture recycling accounted for 24% and 14% of precipitation in upstream and middle/downstream regions, respectively. The findings from the stable isotope tracing provide insights into hydrological processes and can help improve water management in inland regions of Central Asia. [ABSTRACT FROM AUTHOR]
- Subjects :
- *WATER supply
*ISOTOPES
*CRYOSPHERE
*GROUNDWATER
*EVAPOTRANSPIRATION
Subjects
Details
- Language :
- English
- ISSN :
- 00221694
- Volume :
- 570
- Database :
- Academic Search Index
- Journal :
- Journal of Hydrology
- Publication Type :
- Academic Journal
- Accession number :
- 134744295
- Full Text :
- https://doi.org/10.1016/j.jhydrol.2019.01.003