Recentiy ， port distUrbance and 皿 oo 血 g distUrbance caused by oscillation has been seen as a problem at many 卿 s and bo雌 ， and fishing pomS ， The 舳 。rs clarified the mechanism of port disturbance generation at Kumaishi fishing po鶏 based on field observa 匠on and numerical simulati ． Howeve ろ tl ｝ e limit wave height which cause moor disturbance on small fishing boats has not been clarified ． The autho 埒 have analyzed moo 血 g limit fbcusing on lo 一 period wave heig 瓧s based on past disasters exempla and the numerica1 simUlation resUltS． Conclusions below have been obtained from the analysis ． 〔 1) Moo 血 g distUfbance accompanied by the pass of low − pressu 祀 or 嫉) hoo4 which dainage ship bodies and rdquiie evacuations to other ports ， occur several times a year at Kumaishi Fishirig port ． (2) Fro皿 the hydK) graphic conditions in case ofmooimg distUrbance ， it is clar 面ed 血 at the moo 血 g disturbance occur in case where Hv3 ， which is the hing lo ・ pedod waye heig is over 2． Om and 疏 is()ver O． 10m ， ms also clarified that the 1irnit fc) r long − period wave for sma11 fish 血 g boats is O， 25m s血 ce long 「 period wave inside the port is amp 苴 fied 25 − fc) ld on 廿 1ese cases ． (3) From the frequency of long − periOd wave inrushing to Ku 皿 】 aishi fishing porち it has been clarified that hydrogrqphic condition 蠢 whose HL is over O． 10m is 5． 75％ throu 帥 ayear and it is l4． 71％ in winter ， which is the greatest value il the yea 孰 (4) The quan 飆 ive血dicat () r 『Hlrs (over 2． Qm) " has been銃〔 troduced as a deoision ildicator for evacuations ． 』 吻 mordSt Oceanogアaphicphenomen Long − per わ dwaves ， 」 ｝ d／ ooring limit ，

At many ports throughout JAP/4N, port disturbanoes caused by long-period oscilIations are currently posing problems at many harbors and fishing ports but many questions ahout the mechanism ofpQrt disturbances are still remained. in the present studM phenomena were analyzed by field observations and factors were analyzed numerically to clarify the mechanism ofthe port disturbance generation accompanying the advance oflong-period wayes into ports. The results are as fbllows; (1) TIhe port disturbanoes at Kumaishi Fishing Port could be attributed to resonances betwgen the natural periods ofthis ponin Modes 1 through 3 and the long-period components of incoming wayes. (2) The results of observations and nurnerical analyses sho-L ifaport has anatuial beach and water passage, the resonance phenomenon reduces the amplimde amplification facton Kay woivls: Oceanagrqpihic phenomenq Longzperiod oseiZlation, Longzperiodwaves, AlatzLralperibd IVbtural resoncmt mode

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M ・血 tenance 。 f fi ・hi ・ g P ・ rts have b・en ・d・・nced 廿U t・ d・ y f・・ 止 ・ p ・ ・ p 。… fkeepi・ g f… af ・ m ・ ・ 血 9 ・ f ・mall fishing boats or improvement in cargo work e丗 ciency Howev 鉱 occurrence of mooring disas 重 ers of small fishing boats is s廿11 reported and it has been a sedous problem ． Then， in this study ， we made experiments using a model ship based on the actual condition of the moo 血 g method and co 皿 sidered interrelation between the ship motion and tension of mooring Ihles． In addition ， we suggested safe mooring of small fishing boats such as how to take a mooring line and the mooring method ． Key 脚 rds ： Harborfacilities ， F ' ∫伽 8 ρ 畝 F 励 ing boat， Mooring disaster

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