港湾域における船舶のSO_2排出総量及び環境濃度の一評価手法
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概要
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A simple method for estimating the total amount of SO_2 exhausted from engines of ships in harbor and bay areas is shown. The main features of the present method are in its macroscopic way of approach, i.e., (1) the determination of effective unloading-time length from the work done by the cargo-oil pumps and the amount of the cargo-oil, (2) the wide use of statistical (or macroscopic) data on ships, and (3) the compilation of complicated (or microscopic) data released from relevant authorities etc. A summary of a survey on atmospheric diffusion theories is also shown for the purpose of application to the diffusion analysis of ship exhaust gas. The results of an application of the present method to the harbor of Yokohama and the bay of Tokyo are summarized as follows : (1) Predominant portion (about 90%) of the total environmental concentration of SO_2 exhausted from ships are due to the ships in the harbor, (2) The contribution of the ships entering and leaving the port is small (at most 4%), (3) The contribution of the ships in the class of 10,000-29,999 G.T. is relatively large (about 30%), (4) The environmental concentration due to ships were estimated to be several ppb's. Referring to the interpretation of the above-shown numerical results, it is added that further studies such as an error estimation are needed in order to give a clear and final meaning to them. At the present stage of the study, the above results have a meaning in offering new reference data obtained by a different method from the others applied up to date.
- 独立行政法人 海上技術安全研究所の論文
- 1980-05-31