达里诺尔湖氢氧同位素与水质水量关系研究

发布时间：2019-01-06 13:53

【摘要】：本文以内蒙古达里诺尔湖为研究对象,通过研究湖泊冰封期水质指标及水体稳定同位素在冰层和水体中的分布特征,并对冰封期的水质指标浓度与同位素含量的关系进行相关分析,将首次通过湖泊冰封期同位素的分布特征指示湖泊水体及冰体中水质指标的分布特点,使同位素示踪剂成为证明与预测水质指标的评价手段。进一步的利用同位素示踪水循环,通过分析达里湖地区同位素线性关系,并结合总溶解性固体对达里湖的补给关系进行探究,利用稳定同位素物质平衡模型估算达里湖蒸发量,间接地指示出水循环过程中存在的问题。具体得出以下结论：在冰封期,达里湖水体中营养盐的平均浓度相对较高,已远超过国家标准的五类水标准。冰封期由于结冰过程中同位素的热力学分馏效应明显,加之贡格尔河的入流补给,使得达里湖冰体中的氢、氧同位素的含量远高于水体中的含量。本文首次得出同位素与营养盐在冰-水以及冰体中具有显著负相关关系,通过定量关系方程：TN=-0.2825 D-6.0083和TP=-0.0805D-1.2395,实现了冰封期以氢氧同位素对水质指标的指示。对达里湖水循环过程中不同水体稳定同位素的含量进行回归分析,推求达里湖地区的大气降水线δD=6.6866δ18O-8.3124(R2=0.7908)以及达里湖蒸发趋势线δD=4.5349δ180-27.054(R2=0.9009),分析线性关系以及总溶解性固体和区域水文地质条件,得出地下水为达里湖的主要补给源。以水体稳定同位素方法为研究手段,利用稳定同位素物质平衡模型估算达里湖的蒸发量,这种方法为内蒙地区水量循环的研究提供了新的方法。
[Abstract]:In this paper, the characteristics of water quality index and stable isotope distribution in the ice sheet and water body of the lake during the glacial period were studied by taking Darinole Lake, Inner Mongolia, as the research object. The relationship between water quality index concentration and isotopic content in the ice period is analyzed. The distribution characteristics of water quality indexes in lake water and ice body are indicated by the distribution characteristics of isotopes in lake ice period for the first time. The isotope tracer can be used as an evaluation method to prove and predict the water quality index. Further using isotope tracer water cycle, by analyzing the isotopic linear relationship in the Dali Lake area, and combining with the total dissolved solids to explore the supply relationship of Dali Lake, and using the stable isotopic material balance model to estimate the evaporation of Dali Lake, Indirectly indicates the problems in the process of water circulation. The main conclusions are as follows: during the period of ice closure, the average concentration of nutrients in the water of Lake Daly is relatively high, which has far exceeded the five water standards of the national standard. Due to the obvious thermodynamic fractionation effect of isotopes during ice formation and the recharge of Gongge River, the contents of hydrogen and oxygen isotopes in the ice body of Lake Daly are much higher than those in the water body. It is the first time that isotopes have a significant negative correlation with nutrients in ice-water and ice bodies. The quantitative equations are: TN=-0.2825 D-6.0083 and TP=-0.0805D-1.2395,. The indicator of water quality by hydrogen and oxygen isotopes during ice closure is realized. The stable isotopic contents of different water bodies during the water cycle of Lake Dali are analyzed by regression analysis, and the atmospheric precipitation line 未 D ~ (6) C ~ (6) 6866 未 18O-8.3124 (R _ (2) O _ (0.7908) and the evaporation trend line 未 D ~ (4) 4.5349 未 180-27.054 (R _ (22) 0.9009) in the Dali Lake region are derived. By analyzing the linear relationship and the hydrogeological conditions of total dissolved solids and regions, it is concluded that groundwater is the main recharge source of Dali Lake. Based on the stable isotope method of water body, the stable isotope mass balance model is used to estimate the evaporation of Dali Lake. This method provides a new method for the study of water circulation in Inner Mongolia.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P343.3;X143

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