Evaluation Method for Polluted Lake Water by Monitoring System

In this study, a novel monitoring system of lake water quality which consisted of sampling, detecting, assessing system as well as information database method was constructed. The field-gathered and partially processed data (such as water temperature, pH value.) are recorded using near-infrared spectroscopy, and calibrated against the water chemistry by the conventional analytical methods. The level of the eutrophication was evaluated by the trophic state index and biological index. The information obtained are transmitted to the database and distributed through the wide area network to administration units, enterprises, institutes and public. A case study was carried out in the Lake Kasumigaura, the second biggest lake in Japan.