SGD is of great significance for coastal environments.It can be a pathway of land nutrients and pollutants to the coastal ocean, and thus exert some influences on water quality.

• 沿海地下水排放具有重要的环境意义，它可以是陆地营养物质和污染物质的一个重要排放通道，可以对海岸带环境产生一定影响。