Influence of Flow Patterns on Dissolved Oxygen in Hypoxic Ports of Eutrophicated Bay Assessed by Observation and Numerical Simulation

摘要

The coastal area at the head of Osaka Bay, which is highly urbanized, has been developed into an enclosed area with complicated artificial islands and breakwaters. In order to clarify the influence of currents on hypoxic water in this enclosed area, field surveys were done to measure currents inside the ports of Amagasaki-Nishinomiya-Ashiya and Kobe. Numerical computations to simulate currents and water quality in summertime were also carried out using the Princeton Ocean Model (POM) and a water quality model. Density current plays an important role and contributes to an increase in the current velocity and a decrease in the stagnation in the harbors. The currents in the harbors bring an increase of dissolved oxygen (DO) in the port of Kobe and a decrease of DO in the Amagasaki-Nishinomiya-Ashiya (ANA) port.