中文摘要：

海滨填埋场是沿海地区垃圾处理的一个重要选择,但其渗滤液泄漏引发的地下环境污染具有一定的独特性。以渗滤液中长时间保持高浓度的氨氮作为指标,通过构建砂箱实验,探讨咸水条件下氨氮在地下环境中的迁移转化过程。结果表明,在地下水环境中,渗滤液氨氮较易沿水流水平方向扩散,扩散速度随空间推移不断降低,从开始的4 cm/d降低到出水处的3.2 cm/d;其衰减率沿饱和区、过渡区、调整区依次增高;同时其衰减率随时间的增加不断降低,在实验的第15、25、35、45和55天,分别为100%、98.7%、95.6%、91.8%和83.5%。

英文摘要：

Abstract The landfill along seacoast is the main way of garbage disposal for coastal areas. Leachate leak- age of these landfills causes complex and unique pollution to the groundwater. NH3-N is taken as a key indicator because of the high concentration in the leachate. By devising sand-box model, the migration and transformation process of NH3-N are surveyed and analyzed under salty water conditions. Simulation results indicate that the NH3-N is easy to diffuse horizontally along the water flow. The diffuse rate decreases from 4 cm/d to 3.2 cm/d. Moreover, the decay rate of NH3-N decreases with space, in order, in saturation zone, transition zone and termi- nation zone. And it also decreases with time, for example, from 100% to 83.5% hetween 15 d and 55 d.