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

为了获得沿海地区温度、盐度、溶解氧和浊度的短期和长期变化，需要进行实时监测。这些特性的迅速变化对沿海海水养殖业的鱼类和贝类产生了至关重要的影响。本研究的目的是建立一个特定深度的水质监测系统，用于预测2001-2003年期间近海底涌出的缺氧水。大田试验是从2001年夏天开始在内浦湾的渔业养殖场进行的。传感器安装在10米深处，并将存储的数据通过电子邮件发送到一些站点。除一些附着在传感器上的微生物对盐度、溶解氧和浊度传感器的测定值逐渐降低外，试验结果是成功的。在此基础上进行了以下改进：(1)研制了100m长的温度阵列；(2)研制了溶解氧传感器。另一个海水养殖场安装了温度阵列和水质传感器，因此从2002年4月开始对两个站进行监测，从2003年4月起对三个站进行监测。温度观测提供了沿海地区的水交换、内波和上升流的信息，这些数据是通过电子邮件接收数据的渔民避免海水养殖鱼类死亡的有用信息。对溶解的传感器进行了改进，以避免附着在传感器上的微生物，并将从2004年6月起在内浦湾的田间安装。

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.