Evaluation of Soundness in Honmyo River Aiming at Waterway Restoration

摘要

Recently, improvement project of river environment aiming at nature restoration is spreading. The water quality purification utilizing the potential of nature is expected. It is well known that aquatic vegetation decreases pollutants in water. It is supposed that efficiency of water quality purification is improved if the physic-chemical and biological water quality indices and ecosystem of water body are in good condition. In addition, overall grade considering an ecological figure becomes important as well as the well known water quality indices. In this study, soundness of the Honmyo River in Nagasaki is evaluated by comparing to the observed data of the vegetation channel and comprehensively evaluating these conditions.