海底堆積物内の物資循環モデルに関する基礎的研究

概要

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This work shows a numerical model about the nitrogen circulation in marine sediment. The basic equations of the model as well as numerical methods are described in detail. The model includes biochemical and chemical reactions in aerobic and anaerobic processes, and also includes convection due to burial velocity and molecular diffusion in the sediment. The finite difference method with unequally spaced grid system, which increases its interval exponentially downwards, is applied to analyze highly concentrated distribution of mater near the sediment surface. As exemplary results, steady solutions for the open-sea condition and time transient solutions corresponding to laboratory experiments (core tests) are depicted. On the open-sea computation, the effects of the number of grids and the interval of time integration to the accuracy of solution are evaluated. On the time transient computation, the conservation of nitrogen during the whole period of computation is examined. These investigations demonstrate the robustness of the model, and provide useful data for practical utilization of the model. In addition to this technical information, the mass-balance and transfer in the sediment and overlying water on the open-sea computation are presented to show the phenomena.
四日市大学の論文
2004-09-30