The composition characteristics of hydrogen and oxygenstable isotopes as an indicator of evaporation in the River Lijiang, China
REN Meng-meng1,2, HUANG Fen1, HU Xiao-nong2, CAO Jian-hua1, ZHANG Peng1,2, LIANG Jian-hong1, ZHANG Jin3
1. Key Laboratory of Karst Dynamics, Ministry of Natural Resources/Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China;
2. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China;
3. Jinan University, Guangzhou 510632, China
The stable isotope compositon of water (δD and δ18O) were collected in November 2018 and March 2019 along the Lijiang River to estimate their indication of the evaporation. The results showed that:the δD and δ18O values had different composition characteristics among different sampling sietes in the the Lijiang River, the δD and δ18O values of groundwater was smaller than those of surface water, the δD and δ18O values in the wet season were easier to enrich than in the dry season; The variation trend of δ18O value was more obvious than d-excess under the increasing of water temperature. The elevation gradually decreased from the upstream to the downstream, and the slope and intercept of Lijaing River water line also gradually decreased; Underground river water line and Lijiang River water line were closely to local meteoric water line(LMWL), indicating that there was a close hydraulic connection between underground river, Lijiang River and precipitation in the study area. Due to the influence of temperature and humidity, the evaporation proportion of Lijiang River in wet season and dry season were 0.7%~9.1%,2.6%~9.7%, respectively; The evaporation proportion from upstream to downstream gradually increased in the study area, regardless of in wet season or dry season. The evaluated evaporation value based on isotope mass balance model in the study area was 959.40mm, which was less 43.11mm than the multi-year monitoring data, with the relative error of 4.70%; Using stable isotopes (δD and δ18O) is an essential method to study the hydrological cycle in a river basin, thus stable isotope still has a wide application space in hydrological cycle in Lijiang River Basin.
任梦梦, 黄芬, 胡晓农, 曹建华, 张鹏, 梁建宏, 张晋. 漓江流域δD和δ18O对蒸发的指示作用[J]. 中国环境科学, 2020, 40(4): 1637-1648.
REN Meng-meng, HUANG Fen, HU Xiao-nong, CAO Jian-hua, ZHANG Peng, LIANG Jian-hong, ZHANG Jin. The composition characteristics of hydrogen and oxygenstable isotopes as an indicator of evaporation in the River Lijiang, China. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1637-1648.
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