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海岸带地区,陆源物质由近岸向沿岸海洋输送的途径有很多,而在一些海岸或海湾,其中较普遍的一个过程就是海底地下水排放。它是发生在沿岸地区与毗邻海洋之间的又一个重要的陆海相互作用过程。目前,通过水文、直接测量和地球化学示踪法研究地下水排放的例子有很多,但对其进行定量估算仍面临着许多困难。本文主要介绍镭同位素地球化学示踪法的基本原理及应用,以海南东北部沿岸水域中镭同位素数据为例,计算得到相应的地下水排放通量为5.4×10-4dm3/(d.cm2)。
In the coastal zone, there are many ways for terrestrial material to be transported from coastal shore to coastal ocean. In some coastal areas or gulfs, one of the more common processes is the discharge of seabed groundwater. It is another important process of land-sea interaction that takes place between coastal areas and adjacent seas. At present, there are many examples of studying groundwater discharges through hydrological, direct measurement and geochemical tracing methods, but there are still many difficulties in quantitatively estimating them. This paper mainly introduces the basic principle and application of radium isotope geochemical tracer method. Taking the radium isotope data of coastal waters in the northeast of Hainan as an example, the corresponding groundwater discharge flux is calculated to be 5.4 × 10-4dm3 / (d.cm2).