Title of Project : Research on Advancement of Numerical Simulation of Oceanophysical Environment in Ocean Engineering

这组大学研究人员从事开发数值模拟程序，预测一个巨大的浮式海洋结构物（HFOS）对其周围海水的海洋环境的海洋物理效应。本研究项目的主要目的是修改上述模拟程序，以便不仅能够同时评估氢氟辛烷磺酸的海洋物理影响，而且能够同时评估其生物和化学影响;除了海水运动外，还通过数值模拟预测海水中的水温和盐度、叶绿素a和溶解氧（DO），通过与东京湾Oppama附近Mega-Float结构物的实测资料比较，得出以下结论：（1）DO的预测值与实测值的时间变化在定量上有较好的一致性。(2)相反，预测的叶绿素a浓度与观测的一致程度是不令人满意的。叶绿素a浓度的模拟需要改进。(3)为了提高叶绿素a的预测精度，应增加氮、磷等营养盐的测定，并对营养盐的预测值与实测值进行一致性检验。

This group of university researchers has engaged in developing numerical simulation program of predicting oceanophysical effects of a huge floating offshore structure (HFOS) to the marine environment of its surrounding sea water. The main aim of the present research project is to modify the above-stated simulation program so that not only oceanophysical effects but also biological and chemical effects of an HFOS might be evaluated simultaneously ; in addition to the sea water movement, water temperature and salinity, chlorophyll-a and dissolved oxygen (DO) in the sea water are predicted by numerical simulation, and compared with observation data measured in the close vicinity of Mega-Float structure moored off Oppama in Tokyo Bay.Some conclusion obtained in the present study are as follows :(1) Time-variation of predicted DO agrees fairly well with that of observed DO quantitatively.(2) To the contrary, the degree of agreement of predicted chlorophyll-a concentration with observed one is unsatisfactory. The modeling of chlorophyll-a concentration needs remarkable improvement.(3) In order to improve prediction accuracy of chlorophyll-a, additional measurement of nutritive salts such as nitrogen and phosphorus should be carried out, and agreement of nutritive salts between prediction and observation must be examined.