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Academic Journal of Environment & Earth Science, 2024, 6(2); doi: 10.25236/AJEE.2024.060205.

Spatial distribution and influencing factors of stable hydrogen and oxygen isotopes in river water during rain period in Shiyang River Basin

Author(s)

Junju Zhou, Jiawei Chen, Suhan Shi, Peiyuan Song

Corresponding Author:
Junju Zhou
Affiliation(s)

College of Geography and Environment Science, Northwest Normal University, Lanzhou, China

Abstract

Understanding the stable hydrogen and oxygen isotope composition of river water in the basin is of great significance for identifying the evolution mechanism of water cycle and the composition of water source. Based on the test results of δD and δ18O of river water and precipitation samples collected from Shiyang River in August 2020, this paper analyzed the composition characteristics of δ18O and δD of river water in Shiyang River Basin during rainy period, and further revealed the spatial evolution characteristics and influencing factors. The results show that the δ18O and δD values of the main and tributaries of Shiyang River are gradually enriched along the river, showing an increasing trend, while the excess deuterium is decreasing along the river. The effect of δ18O and δD in river water is significant, and the variation of δ18O altitude gradient is smaller than that of local precipitation and global precipitation. Using the evaporation loss calculation model, it can be seen that evaporation fractionation has an obvious effect on the water isotope change of Shiyang River, and the main stream of Shiyang River has the greatest effect, followed by Jinta River and Zamu River. The evaporation of reservoir water is more intense than that of river water. Precipitation is the main source of river water, and the isotope is mainly affected by the isotopic composition of river water in tributaries, and is controlled by the elevation effect, the continuous evaporation effect along the direction of runoff, and the higher degree of evaporation effect in the rainy season.

Keywords

Hydrogen and oxygen isotopes, Elevation effect, Evaporation loss

Cite This Paper

Junju Zhou, Jiawei Chen, Suhan Shi, Peiyuan Song. Spatial distribution and influencing factors of stable hydrogen and oxygen isotopes in river water during rain period in Shiyang River Basin. Academic Journal of Environment & Earth Science (2024), Vol. 6, Issue 2: 30-42. https://doi.org/10.25236/AJEE.2024.060205.

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