Development of the dynamic control method of nutrient cycles based on the 3 dimensional monitoring systems in semi-enclosed bays

为了量化近岸水体中细粒沙的物质收支，我们开发了监测系统并进行了现场观测。从市区水质监测结果来看，雨后即刻SS增加了10倍左右。另一方面，红树林河口的浊度变化不大，其增加幅度明显小于城市河流。此外，总氮(TN)和总磷(TP)也有相同的变化趋势。结果表明，红树林天然河流对沿海地区的固体和营养物质的过量外流具有一定的调节作用。我们的观测系统成功地捕捉到了时间、降雨事件以及沿海地区SS和养分随后的变化。

To quantify the material budget focusing on fine scale sand in coastal water body, we developed monitoring systems and conducted the field observations. From comparison of monitoring results of water qualities in urban area, SS increased about 10 times immediately after rain. On the other hand, turbidity in mangrove estuaries didn't change soon and the rate of increase was remarkably smaller than in urban river. In addition, TN (Total Nitrogen) and TP (Total Phosphorus) also had same tendencies. It showed that mangrove natural rivers moderate excess outflow of solids and nutrients to coastal area. Our observing system, successfully captured periods of timing, rainfall events, and subsequent changes in SS and nutrients in coastal region.