Pub Date : 2023-09-01DOI: 10.2208/kaigan.77.2_i_55
Hiyori Yoshino, N. Hashimoto, Yoshihiko Ide, K. Kawaguchi, Masao Mitsui
The Nationwide Ocean Wave Information Network for Ports and Harbors (NOWPHAS) conducted by the Port and Harbor Bureau of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) in Japan, uses a Doppler Wave Meter (DWM) as a standard equipment for wave observation. Depending on the situation, the system supplements the missing data by estimating surface waves based on water pressure data as appropriate. Meanwhile, in the case of cargo handling in harbors, the significant wave height is generally used as a criterion. It has been reported that even under conditions where wave heights are considered calm, there are many cases where large ship motions occur, causing problems with cargo handling operations. Since large ship motions occur when the long-period wave component is close to characteristic period of the vibration system consisting of the hull and mooring cables, it is necessary to examine the frequency domain based on spectra instead of the significant wave height. Therefore, in this study, the frequency-domain analysis was used as the basis for the estimation of surface waves from bottom pressure waves. The transfer function that relates the two wave quantities is estimated to convert the pressure wave to a water surface wave. The purpose of this study is to develop a method for estimating surface waves that can be used not only during storms, but also for examining the marginal loading wave conditions for long period waves at all times.
{"title":"RECOVERY OF SURFACE WAVES FROM BOTTOM PRESSURE BY NEURAL NETWORK WITH BISPECTRUM","authors":"Hiyori Yoshino, N. Hashimoto, Yoshihiko Ide, K. Kawaguchi, Masao Mitsui","doi":"10.2208/kaigan.77.2_i_55","DOIUrl":"https://doi.org/10.2208/kaigan.77.2_i_55","url":null,"abstract":"The Nationwide Ocean Wave Information Network for Ports and Harbors (NOWPHAS) conducted by the Port and Harbor Bureau of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) in Japan, uses a Doppler Wave Meter (DWM) as a standard equipment for wave observation. Depending on the situation, the system supplements the missing data by estimating surface waves based on water pressure data as appropriate. Meanwhile, in the case of cargo handling in harbors, the significant wave height is generally used as a criterion. It has been reported that even under conditions where wave heights are considered calm, there are many cases where large ship motions occur, causing problems with cargo handling operations. Since large ship motions occur when the long-period wave component is close to characteristic period of the vibration system consisting of the hull and mooring cables, it is necessary to examine the frequency domain based on spectra instead of the significant wave height. Therefore, in this study, the frequency-domain analysis was used as the basis for the estimation of surface waves from bottom pressure waves. The transfer function that relates the two wave quantities is estimated to convert the pressure wave to a water surface wave. The purpose of this study is to develop a method for estimating surface waves that can be used not only during storms, but also for examining the marginal loading wave conditions for long period waves at all times.","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124005461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.2208/kaigan.78.2_i_247
H. Matsutomi, T. Arikawa
Aiming for the advancement of tsunami load, historical and/or prospective tsunami scale evaluations, practical empirical formulas for evaluating friction factor K of inundation flow and density ρ of inundation water over a movable bed, which can be applied to a tsunami run-up theory, are proposed using experimental data whose amount (range) is increased (expanded) by carrying out additional experiments on ρ and run-up of inundation flow with sediment, and verification data of the above theory under a uniformly sloping movable bed condition are provided. Series solutions with a higher universality to the run-up of tsunami inundation flow with sediment over a uniformly sloping movable bed, in which both K and ρ depend on time, are derived under the conditions depending on an incident bore height h1 at shoreline (or an initial stored water depth), bed slope i, median particle diameter d50 of initial bed material, and examples of the solutions are shown. The solutions are applicable to the case that ρ is independent on time, i.e., the case of inundation flow without sediment over a movable bed or fixed bed. Including the case of inundation flow without sediment, validity of one of the solutions is also verified through a comparison with the verification data on run-up distance.
{"title":"TSUNAMI RUN-UP CONSIDERING TIME VARIATION OF DENSITY OF INUNDATION WATER","authors":"H. Matsutomi, T. Arikawa","doi":"10.2208/kaigan.78.2_i_247","DOIUrl":"https://doi.org/10.2208/kaigan.78.2_i_247","url":null,"abstract":"Aiming for the advancement of tsunami load, historical and/or prospective tsunami scale evaluations, practical empirical formulas for evaluating friction factor K of inundation flow and density ρ of inundation water over a movable bed, which can be applied to a tsunami run-up theory, are proposed using experimental data whose amount (range) is increased (expanded) by carrying out additional experiments on ρ and run-up of inundation flow with sediment, and verification data of the above theory under a uniformly sloping movable bed condition are provided. Series solutions with a higher universality to the run-up of tsunami inundation flow with sediment over a uniformly sloping movable bed, in which both K and ρ depend on time, are derived under the conditions depending on an incident bore height h1 at shoreline (or an initial stored water depth), bed slope i, median particle diameter d50 of initial bed material, and examples of the solutions are shown. The solutions are applicable to the case that ρ is independent on time, i.e., the case of inundation flow without sediment over a movable bed or fixed bed. Including the case of inundation flow without sediment, validity of one of the solutions is also verified through a comparison with the verification data on run-up distance.","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114528907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.2208/kaigan.76.2_i_469
T. Yokota, T. Uda, A. Kobayashi, Yukiyoshi Hoshigami, A. Katsuki, Yasuhito Noshi
The morphology of sand dunes formed on the Maisaka and Hamamatsu coasts facing the Enshu-nada Sea was investigated by field observation. The development of sand dunes was numerically predicted using a model predicting the effect of both waves and windblown sand. In the field observation, the development of sand dunes with a rhythmic shape similar to a sand spit was observed in the backshore area. It was found that pine trees died in the area with a narrow sand dune owing to wave run-up and the dispersion of salinity during storm wave conditions. In the numerical simulation, the formation of sand dunes was successfully reproduced under the condition that the predominant wind blew at a large angle relative to the direction normal to the shoreline.
{"title":"PREDICTION OF TOPOGRAPHIC CHANGES ON ENSYUNADA COAST CONSIDERING EFFECT OF BOTH WAVES AND WINDBLOWN SAND","authors":"T. Yokota, T. Uda, A. Kobayashi, Yukiyoshi Hoshigami, A. Katsuki, Yasuhito Noshi","doi":"10.2208/kaigan.76.2_i_469","DOIUrl":"https://doi.org/10.2208/kaigan.76.2_i_469","url":null,"abstract":"The morphology of sand dunes formed on the Maisaka and Hamamatsu coasts facing the Enshu-nada Sea was investigated by field observation. The development of sand dunes was numerically predicted using a model predicting the effect of both waves and windblown sand. In the field observation, the development of sand dunes with a rhythmic shape similar to a sand spit was observed in the backshore area. It was found that pine trees died in the area with a narrow sand dune owing to wave run-up and the dispersion of salinity during storm wave conditions. In the numerical simulation, the formation of sand dunes was successfully reproduced under the condition that the predominant wind blew at a large angle relative to the direction normal to the shoreline. ","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114203254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-15DOI: 10.2208/kaigan.77.2_i_673
Y. Inoue, Masami Kiku, Tomoaki Nakamura, N. Mizutani
{"title":"STUDY ON AUTOMATIC CLASSIFICATION OF GRAVEL BEACH SEDIMENTS USING MACHINE LEARNING","authors":"Y. Inoue, Masami Kiku, Tomoaki Nakamura, N. Mizutani","doi":"10.2208/kaigan.77.2_i_673","DOIUrl":"https://doi.org/10.2208/kaigan.77.2_i_673","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114218948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Waku Kimura, E. Masunaga, Taichi Kosako, Y. Uchiyama
{"title":"TRANSPORT PROCESSES AROUND THE IZU-CHAIN ISLANDS INVESTIGATED WITH A LAGRANGIAN PARTICLE TRACKING MODEL","authors":"Waku Kimura, E. Masunaga, Taichi Kosako, Y. Uchiyama","doi":"10.2208/kaigan.75.i_211","DOIUrl":"https://doi.org/10.2208/kaigan.75.i_211","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122182571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.2208/kaigan.78.2_i_745
Satoshi Nakada, K. Kamio, Norikazu Masuda, Y. Nihei
{"title":"EVALUATION FOR TEMPORAL VARIATION OF SEAWATER EXCHANGE RATIO IN AQUAFARM BASED ON STATE-OF-THE-ART AUTOMATIC OBSERVATION AND PARTICLE TRACKING MODEL","authors":"Satoshi Nakada, K. Kamio, Norikazu Masuda, Y. Nihei","doi":"10.2208/kaigan.78.2_i_745","DOIUrl":"https://doi.org/10.2208/kaigan.78.2_i_745","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115266762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"THERMAL FLUID DIFFUSION AND ADVECTION PHENOMENA IN POROUS MEDIA BY BEACH OF IBUSUKI COAST","authors":"Akio Nagayama, Y. Morimoto, Takatomo Miyake","doi":"10.2208/kaigan.75.i_31","DOIUrl":"https://doi.org/10.2208/kaigan.75.i_31","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"62 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120906356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.2208/kaigan.77.2_i_73
Toshikazu Kitano
{"title":"ACCORDANCE OF COMPONENTWISE MAXIMA IN MULTIVARIATE SEA EXTREME EVENTS","authors":"Toshikazu Kitano","doi":"10.2208/kaigan.77.2_i_73","DOIUrl":"https://doi.org/10.2208/kaigan.77.2_i_73","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"15 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120986444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Toru Yoshida, M. Itou, Shinichiro Tabata, Tsutomu Kawaguchi, T. Yamashita
{"title":"PREDICTION OF CURRENT AND TOPOGRAPHICAL CHANGE IN CONSIDERATION OF TEMPORAL VARIATION IN WAVES AND WINDS AT THE BAKKAI FISHING PORT","authors":"Toru Yoshida, M. Itou, Shinichiro Tabata, Tsutomu Kawaguchi, T. Yamashita","doi":"10.2208/kaigan.75.i_517","DOIUrl":"https://doi.org/10.2208/kaigan.75.i_517","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124862200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.2208/kaigan.78.2_i_601
Y. Hamano, K. Hirayama, S. Yamada
{"title":"MODEL EXPERIMENT AND NUMERICAL SIMULATION FOR WAVE OVERTOPPING AND INUNDATION ON QUAY DURING HIGH TIDE","authors":"Y. Hamano, K. Hirayama, S. Yamada","doi":"10.2208/kaigan.78.2_i_601","DOIUrl":"https://doi.org/10.2208/kaigan.78.2_i_601","url":null,"abstract":"","PeriodicalId":417255,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126004315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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