有明海島原半島沿岸における鉛直微細構造観測(環境・地球・宇宙海洋・海域+災害(1),一般講演)

概要

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In recent years, strong density stratification is pointed out as one of the reasons for the deterioration of aquatic environment in Ariake Bay. In this study, field observations on microstructures were carried out in Ariake Bay by using a microstructure profiler which acquires fine-scale vertical shears of velocities and temperature gradients. However it is difficult to figure out turbulent structures near boundaries, such as sea beds and ruffled water surfaces, because of the principle of a shear sensor and so on. Therefore, turbulent kinetic energy dissipation rates ε were estimated not only from the vertical shears ordinarily used in this kind of measurements but also from temperature gradients in order to find ways to grasp values of ε near boundaries. As a result, ε estimated by temperature gradients were of the same order as those by vertical shears but a method for estimation needs to be improved for accurate evaluation of variations of those.
2009-09-02