Development and Application of Real-Time Monitoring System for Coastal Environment

需要实时监测沿海地区的温度、盐度、溶解氧和浊度的短期和长期变化。这些特性的快速变化对海岸附近海水养殖的鱼类和贝壳产生了重大影响。为预测2001 ~ 2003年近海底上升流缺氧水，建立了特定深度水性质监测系统。本试验于2001年夏季在内村湾渔场进行。传感器安装在10米深，存储的数据通过电子邮件发送到一些站点。除了一些附着在传感器上的微生物逐渐降低了盐度、溶解氧和浊度传感器的值外，试验结果是成功的。然后计划并尝试了以下改进措施；(1) 100m长度温度阵列的制备；(2)溶解氧传感器的制造。在另一个海水养殖场安装了温度阵列和水特性传感器，因此从2002年4月起在两个站点和2003年4月起在三个站点继续监测。温度观测提供了沿海地区的水交换、内波和上升流的信息，这些数据对通过电子邮件接收数据的渔民在海水养殖中避免鱼类死亡是有用的信息。对溶解传感器进行了改进，避免了附着在传感器上的微生物，并将于2004年6月在内村湾现场安装。

The real time monitoring are required to get shot-and long-term variations of temperature, salinity, dissolved oxygen and turbidity in coastal region at all times. The rapid change of these properties crucially affects fish and shell in mariculture near the coast. This study has been carried out to construct a monitoring system of water properties at a particular depth for forecasting upwelled anoxic water near the sea bottom during the period from 2001 to 2003. The field test was made at the fishing mariculture field in Uchiura Bay stating from the summer in 2001. The sensors were installed at 10m depth and the stored data were sent to some stations by E-mail. The test was a successful result except the gradual decrease value of the salinity, dissolved oxygen and turbidity sensors by some adherent micro-lives to the sensors. Then following improvement has been planned and tried ; (1) preparation of temperature array with 100m length, and (2) manufacture of dissolved oxygen sensor. The temperature array and water property-sensor were installed at the other mariculture field, and so the monitoring has continued at both stations from April 2002 and three stations from April 2003. The temperature observations gave the information of the water exchange, internal wave, and upwelling in the coastal region, and these data are useful information to avoid mortality of the fish in the mariculture by fishermen who receive the data by E-mail. The dissolved sensor is improved to avoid the adherent micro-lives to the sensors and will be installed at the field in Uchiura Bay from June 2004.