Author(s): Ugendra Regmi; Makoto Takeda; Naoki Matsuo
Linked Author(s): Naoki Matsuo
Keywords: Water quality; Tidal change; Spring and neap tides; Sludge; Environmental problems
Abstract: Study of water quality around Matsusige Lock Gate areas is very important for the living organism of the Hori River. Therefore, abundant observations were done around Matsusige Lock Gate area. Firstly, observation is carried out to find out the distributions of velocity using ADCP along the longitudinal profile of Hori River which shows the velocity characteristics near Matsusige Lock Gate area. And secondly, observations have been done at Matsusige and Sanno Bridge at the spring and neap tides using salinity, dissolved oxygen, turbidity and chlorophyll as indicators to examine the water quality states. Overall, the water quality of the Hori River was greatly influenced by the inflow from Nakagawa Canal during tidal changes. The extremely high levels of chlorophyll and high value of dissolved oxygen from inflow Nakagawa Canal to Hori River give a good indication for the better inhabitant for fishes and other living organisms and enabling better environment around the Nagoya City. Moreover, very low value of DO at neap tide, when the impact of inflow from Nakagawa Canal has not occurred, indicates the bad status of water quality specially DO around Matsusige Lock Gate area. In addition to this, a hypothesis is made to assess the impact of sludge on water quality at Matsusige Bridge and Sanno Bridge. The severe pollution of water in Hori River becomes an important environment problem and inflow from the Nakagawa Canal would be the best way to create and restore a sustainable water system of the Hori River for the better inhabitant for fishes and other living organisms and enabling better environment around the Nagoya City.
Year: 2012