The Badain Jaran Desert is located in the centre of the Alxa Plateau to north of the Qilian Mountains and the Tibetan Plateau.It is the second largest desert in China with an area of 52 162 km2.Elevation in the interior of the Badain Jaran ranges from 1 500 m in the southeast to 900 m in the northwest,producing a regional hydraulic gradient from SE to NW.The unique desert environment with its lakes attracted many scientific investigations,so in this paper,by analyzing hydrogen and oxygen isotopes in the desert lakes and groundwater in the southeast of Badain Jaran Desert,connecting with totally dissolved solids（TDS） of groundwater,we discussed the recharge relationship between lakes and groundwater in the desert area,and made a further investigation on the evaporation in the Badain Jaran Desert.The hydrogen and oxygen isotope test indicated that the averaged δD and δ18O compositions had a relationship of δD=4.1δ18O-30.02‰（n=37,R2=0.94）,and the low slope of the evaporation line indicated the enhanced evaporation in the Badain Jaran Desert.The lakes had a similar evaporation trend with the groundwater in the southeast Badain Jaran Desert,and it implied that there was some degree of recharge between them.Comparison of the isotopic enrichment degrees of groundwater in the central region and the southeastern parts of the desert showed that the groundwater evaporated in the central region was more severe than in the southeast margin.Comparison of the evaporation of lagoon in the study area and in other arid regions illustrated that the lakes in the Badain Jaran Desert were affected by the effect of excessive evaporation.
Badain Jaran Deserthydrogen and oxygen isotopesgroundwaterlocal meteoric water lineevaporation effect
NETL
NSTL
万方数据
维普
