莱州湾南岸平原区海水入侵的氯、溴、锂稳定同位素解析

South coastal plain of Laizhou Bay is one of most serious area of seawater intrusion. There are two different intrusion types: modern seawater intrusion and brine intrusion in this area. It is also important seawater intrusion research area in China and even in the whole world. So far, analytic methods of traditional hydrogeology and water-chemistry can’t depict finely geochemical process of seawater intrusion and distinguish effectively two different seawater intrusion types in south coastal plain of Laizhou Bay. In this study, south coastal plain of Laizhou Bay is chosen as the research area. The distribution characteristics, evolving regulation and fractionation mechanism of Cl/Br/Li stable isotopes in different waters in the research area will be discussed at a high-resolution ratio by using non-traditional stable isotopes (chlorine isotope, bromine isotope, and lithium isotope), and bromine isotope fractionation mechanism will be especially focused on. And then, combined with conventional analytic methods of hydrogeology, water-chemistry and stable isotope fractionation theory (18O, 2H), hydro-geochemistry action of seawater intrusion process will be discussed, interaction law between seawater and groundwater will be revealed, process and type of seawater intrusion will be ascertained in the research area. Out of question, this study results will offer a scientific basis of reasonable development of water resources, correct prediction of seawater intrusion tendency and effective prevention and control of seawater intrusion in the research area.

莱州湾南岸平原区是我国海水入侵最严重的地区之一，有现代海水入侵和卤(咸)水入侵两种类型，亦是我国乃至全世界的海水入侵重要研究区域。目前，应用常规的水文地质、水化学分析方法尚不能完全精细刻画莱州湾南岸平原区海水入侵的地球化学过程以及有效识别两种入侵类型。因此，本申请课题，以莱州湾南岸平原区作为研究区，利用非传统Cl、Br、Li稳定同位素，高分辨率探讨第四系地下水(淡水、咸水、卤水)、地表水、海水中Cl、Br、Li稳定同位素组成的空间分布特征、演化规律及其分馏机理，尤其是目前国内外研究不足的Br同位素分馏机理；同时，结合常规水文地质、水化学分析方法和传统同位素分馏理论，解析研究区海水入侵过程中的水文地球化学作用，揭示研究区海水与地下水相互作用机制，阐明研究区海水入侵过程、模式和类型，为研究区合理开发淡水和卤水资源、正确预测海水入侵趋势、有效防控海水入侵提供科学依据。

莱州湾南岸平原区是我国海水入侵最严重的地区之一，有现代海水入侵和卤(咸)水入侵两种类型，亦是我国乃至全世界的海水入侵重要研究区域。目前，应用常规的水文地质、水化学分析方法尚不能完全精细刻画莱州湾南岸平原区海水入侵的地球化学过程以及有效识别两种入侵类型。因此，本申请课题，以莱州湾南岸平原区作为研究区，利用非传统Cl、Br、Li稳定同位素，高分辨率探讨第四系地下水(淡水、咸水、卤水)、地表水、海水中Cl、Br、Li稳定同位素组成的空间分布特征、演化规律及其分馏机理，尤其是目前国内外研究不足的Br同位素分馏机理；同时，结合常规水文地质、水化学分析方法和传统同位素分馏理论，解析研究区海水入侵过程中的水文地球化学作用，揭示研究区海水与地下水相互作用机制，阐明研究区海水入侵过程、模式和类型，为研究区合理开发淡水和卤水资源、正确预测海水入侵趋势、有效防控海水入侵提供科学依据。