Characteristics of δD and δ18O in Changhe River Basin and Their Recharge Relationships
In order to further clarify the characteristics of water cycle in the basin,it is necessary to study the characteristics ofδD and δ180 in different water bodies and the recharge relationship in the basin.The Changhe River Basin was taken as the ob-ject to analyze the composition and spatial distribution of hydrogen and oxygen isotopes in different water bodies during dry and wet periods.The results show that:(1)Atmospheric precipitation is one of the main water supply sources in the Changhe River Basin.Due to the influence of evaporation,isotope fractionation leads to the characteristics of"enrichment of δD and δ180 in the water column during dry season compared with wet season".(2)The deuterium surplus of the watershed shows a difference of low in dry season and high in wet season.Surface water and shallow groundwater are both affected by evaporation and water-rock in-teraction in both periods,and the impact is more intense during dry season.(3)The upper reaches of the basin are mainly re-charged by surface water to shallow surface water,while the two waters in the middle reaches alternate seasonally,and the down-stream is recharged by shallow groundwater to surface water.
hydrogen and oxygen isotopessurface water-shallow groundwaterdeuterium surplusChanghe River Basin
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