泥质潮滩的海水-地下水交换量化研究——以莱州湾南岸为例

Quantifying seawater-groundwater exchange rates in muddy tidal flat:a case study of the south coast of the Laizhou Bay

本文目的是利用数值模拟量化研究莱州湾南岸泥质潮滩的海水-地下水交换。选取的典型剖面长约3 800 m,坡度小于1%,沿剖面选取5个监测点,观测地下水的水头和盐度,分析其随时间的变化规律。概化水文地质条件基础上,用SEAWAT-2000建立二维数值模型,模拟水流的流动并将水头模拟值和观测值进行拟合。基于良好的拟合结果,计算出海底地下水排泄(Submarine Groundwater Discharge,SGD)量为17.46 m3/m/d,海水流入量为2.71 m^3/m/d。文章最后提出了观测和模拟过程中存在的问题,需要今后进一步解决。

The purpose of this paper was to quantify the seawater-groundwater exchange in the muddy tidal flat of the south coast of the Laizhou Bay. The typical section selected was about 3 800 m and the slope was less than 1 %. Five locations were selected along the profile, and they were used to observe the head and salinity of the groundwater. The variation of head and salinity with time was analyzed. Hydrogeological conditions were generalized. SEAWAT-2000 was used to establish a twodimensional numerical model to simulate the flow. The simulated values and observed values of the head were fitted. Based on the results of ideal fitting, submarine groundwater discharge value was 17.46 m^3/m/d, and seawater infiltration capacity was2.71 m3/m/d. Finally, this paper put forward some problems in the process of observation and simulation, which needed to be solved in the future.