自然環境の厳しい漁港における入港問題について

概要

論文の詳細を見る
For a design of Marine Guide Fence, two step questionnaires are conducted to users of fishery harbors under severe weather condition. The obtained results are summarized as follows : (1) The thresholds of wind speed and wave height at ship entry into harbors vary by each fishery harbor. Particularly the limit of wave height shows wide variation from 1.5m to 5m. (2) Wave group near the harbor entrance has a kind of regularity and fishermen manoeuvre their ship so that they can pass through the entrance when the waves are small. (3) Fishermen think more of wave conditions than wind ones in entering into a harbor. (4) The distribution of degree of fishermen's tension and relief at harbor entrance shows single sharp peak for the harbor with only main and sub breakwaters, on the other hand it shows flat for the harbors with many breakwaters due to wave attenuation at the entrance. If the distance between the entrance and the most tense position is converted to the ship length, it is (5〜7)L. (5) The ship speed under strong wind and waves is approximately 3.5〜6.0 knots with the cumulative relative frequency of 0.2〜0.8. (6) Under severe weather condition, almost fishing boats slow down near the entrance. However, at the harbor where boats receive against wind and waves, they speed up and pass through the entrance quickly.
社団法人日本航海学会の論文
1994-09-25