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Field Observation of Fine Sediment Resuspension Process at Tama River Mouth in Tokyo Bay 东京湾多摩河口细沙再悬浮过程的野外观测
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.516
Y. Nakagawa, Ryuichi Ariji, S. Matsuzaka, Kazunobu Morohoshi, H. Yagi, K. Nadaoka, Susumu Tanaka
{"title":"Field Observation of Fine Sediment Resuspension Process at Tama River Mouth in Tokyo Bay","authors":"Y. Nakagawa, Ryuichi Ariji, S. Matsuzaka, Kazunobu Morohoshi, H. Yagi, K. Nadaoka, Susumu Tanaka","doi":"10.2208/PROCE1989.55.516","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.516","url":null,"abstract":"A field observation, comprising bottom mounted instruments for near-bottom currents and suspended sediment concentrations, was carried out for 1-month at Tama River mouth in Tokyo Bay. The measurements have captured sediment resuspension during extreme wave conditions associated with typhoon that passed over Kanto district in the early September of 2007. The sediment resuspension was caused primarily by waves at the monitoring site and combined current-wave bottom shear stress reached 0.9 Pa. Based on the SS-flux analysis during the recording period, the net suspended sediment transport at the site was towards the SW or outer Tokyo Bay.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"15 1","pages":"516-520"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87175948","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}
引用次数: 1
Development of a practical method for estimating directional spectrum from HF radar backscatter 一种实用的高频雷达反向散射方向谱估计方法的发展
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.1451
N. Hashimoto, Lukijanto, Masaru Yamashiro, S. Kojima
{"title":"Development of a practical method for estimating directional spectrum from HF radar backscatter","authors":"N. Hashimoto, Lukijanto, Masaru Yamashiro, S. Kojima","doi":"10.2208/PROCE1989.55.1451","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1451","url":null,"abstract":"For the purpose of developing a practical method for estimating directional wave spectrum from HF radar sea-echo Doppler spectrum, a Bayesian method proposed by Hashimoto and Tokuda (1998) is modified and improved. In the method, a formulation of directional spectrum is characterized by an exponential function having the power expressed by a Fourier series over the directional range, while being assumed to be a piecewise-constant function over the frequency range. The method is examined using numerical simulation, with its validity being discussed. The result shows that the method has advantage in that it requires less memory and shorter computation time in practical applications.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"12 1","pages":"1451-1455"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81290911","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}
引用次数: 3
Field Survey of Damage Due to February 2008 High Wave on East Coast of Toyama Prefecture 富山县东海岸2008年2月大浪造成的损失实地调查
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.151
K. Kawasaki, N. Mizutani, K. Iwata, Tomonao Kobayashi, M. Yuhi, T. Saitoh, Toshikazu Kitano, Hirokazu Sumi, H. Mase, T. Yasuda
{"title":"Field Survey of Damage Due to February 2008 High Wave on East Coast of Toyama Prefecture","authors":"K. Kawasaki, N. Mizutani, K. Iwata, Tomonao Kobayashi, M. Yuhi, T. Saitoh, Toshikazu Kitano, Hirokazu Sumi, H. Mase, T. Yasuda","doi":"10.2208/PROCE1989.55.151","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.151","url":null,"abstract":"High wave with long wave period, which is known by local residents as “Yorimawari-Nami”, hit the east coast of Toyama Prefecture on February 24, 2008. The high wave, in particular, caused huge human and property damages in Ashisaki district of Nyuzen town. The purpose of this study is, at first, to examine coastal damages induced by the swelllike wave throughout filed surveys. The characteristics of high wave deformation, wave overtopping of a gentle-slop type revetment and inundation flow in the residential area are, furthermore, discussed by performing wave hindcasting with a GFS-WRF-SWAN coupled model and numerical simulation on wave overtopping of the revetment in Ashisaki district using a two-dimensional numerical wave flume “CADMAS-SURF”.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"7 1","pages":"151-155"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84915878","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}
引用次数: 3
Basic Study of Effects of Mesh Division on Run-up Tsunami Simulation 网格划分对助跑海啸模拟影响的基础研究
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.236
Y. Murashima, F. Imamura, S. Koshimura
{"title":"Basic Study of Effects of Mesh Division on Run-up Tsunami Simulation","authors":"Y. Murashima, F. Imamura, S. Koshimura","doi":"10.2208/PROCE1989.55.236","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.236","url":null,"abstract":"Mesh division of geographic model effects on results of run-up tsunami simulation. Recently, approximate accuracy ofgeographic models increase with using LIDAR (airborne laser). And run-up tsunami simulation using mesh of severalmeters came to be done. In this study, we study effects of mesh division on inundation area of run-up tsunami simulation.To exclude the effects of various conditions of the tsunami simulation, we designed the simplified probability calculationmodel. The calculation model determines the reaching probability of tsunami inundation area. As a result, the tendencythat inundation area of run-up tsunami simulation decreases as mesh size decrease was theoretically confirmed.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"30 1","pages":"236-240"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72869744","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}
引用次数: 0
Estimations of Nutrient Fluxes and Nutrient Load from Waterfowls at a Tidal Flat in the Tokyo Port Wild Bird Park 东京港野鸟公园潮滩水禽养分通量和养分负荷的估计
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.1131
Takumi Hatano, Shintaro Sekiguti, K. Murakami, K. Nakase
{"title":"Estimations of Nutrient Fluxes and Nutrient Load from Waterfowls at a Tidal Flat in the Tokyo Port Wild Bird Park","authors":"Takumi Hatano, Shintaro Sekiguti, K. Murakami, K. Nakase","doi":"10.2208/PROCE1989.55.1131","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1131","url":null,"abstract":"It is said that tidal flat have high biological productivity and high self clarification in coastal water area. In Japan, tidal flat has disappeared and the ability of water clarification has fallen down as a result of coastal reclamation accompanied with industrialization. In this paper, we observed water quality over 2 tidal cycles and calculated nutrient load from waterfowls at a tidal flat in the Tokyo Port Wild Bird Park to estimate the self clarification by tidal flat. In conclusion, we found the following results.(1) Function of this tidal flat is net source of phosphorus and net sink of nitrogen and chlorophyll-a in summer.(2) Nutrient load from great cormorant (Phalacrocorax carbo) is the largest amount among waterfowls and the peak value is obtained in October. However, this value is not so large compared to nutrient fluxes.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"15 1","pages":"1131-1135"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74757852","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}
引用次数: 1
Evaluation of Effect of Beach Nourishment as a Measure against Beach Erosion on South Kujukuri Beach 南久久里海滩营养措施对海滩侵蚀的效果评价
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.731
T. Uda, K. Furuike, Yukiyoshi Hoshigami, Hideki Nagayama
{"title":"Evaluation of Effect of Beach Nourishment as a Measure against Beach Erosion on South Kujukuri Beach","authors":"T. Uda, K. Furuike, Yukiyoshi Hoshigami, Hideki Nagayama","doi":"10.2208/PROCE1989.55.731","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.731","url":null,"abstract":"The effect of the offshore nourishment using sand with several grain sizes was investigated on south Kujukuri Beach. Beach profiles were first measured along four survey lines of the coast as well as the sampling of sea bottom materials. Based on these field data, beach changes were predicted using the contour-line-change model which considers the sorting effect owing to different grain size. It is concluded that the most appropriate method to recover the foreshore and to prevent further beach erosion is to carry out the beach nourishment using sand with mixed grain sizes at a rate of 2×104m3/yr.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"12 1","pages":"731-735"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84964345","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}
引用次数: 2
Experiment on Reduction of wave Overtopping Rate by Seawall with Double Parapet and Permeable Layer 双层胸墙和透水层海堤降低浪涌率试验
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.826
E. Saitoh, T. Hiraishi, Shigeki Inagaki
{"title":"Experiment on Reduction of wave Overtopping Rate by Seawall with Double Parapet and Permeable Layer","authors":"E. Saitoh, T. Hiraishi, Shigeki Inagaki","doi":"10.2208/PROCE1989.55.826","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.826","url":null,"abstract":"Several offshore airports in the Japanese coasts are often damaged+these days by the wave overtopping due to storm s. One of the problems in such offshore airports is the limitation of seawall crown height derived from the width, height and distance of runway. Minami et al.(2007) have proposed a new typ. seawall with a wide permeable layer behind the front parapet to reduce the wave overtopping rate. In this paper, an experiment in a directional wave basin is carried out to determine the most appropriate width of permeable layer and height of its backward parapet. The experimental results reveal that the wave overtopping rate becomes smaller than the allowable level as the permeable layer becomes wider than 6m. The backward parapet has to be higher than 2.5m to prevent the overflow into runways.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"36 1","pages":"826-830"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80547458","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}
引用次数: 0
Long-and Short-term Trends of Shoreline Position Change near the New Mouth of the Omono 欧莫诺新河口附近海岸线位置变化的长期和短期趋势
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.636
H. Matsutomi, Yohei Kondo, Taichi Kimura, Hitoshi Tanaka
{"title":"Long-and Short-term Trends of Shoreline Position Change near the New Mouth of the Omono","authors":"H. Matsutomi, Yohei Kondo, Taichi Kimura, Hitoshi Tanaka","doi":"10.2208/PROCE1989.55.636","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.636","url":null,"abstract":"Long-termt rendo f shorelinep ositionc hangen ear the new moutho f the Omonop ouringi nto the sea of Akita Southern Coast is discussed by using old map, topographicaml aps, field data collected in the last fifteeny ears and by examining accuracy of the old map (Inoul arge-scalem ap). Short-termt rend of shorelinep osition change on the same coast is also discussed to judge whethera remarkabler eceding of shorelinep ositiona t the Hamada-hamab athingp lace located near the mouth in July 2006 is a rare case. Through these discussions, it is concluded that 1) the shoreline position had basi cally advanced from 1800 to around 1900, and then it has gradually receded undulating and 2) the remarkable receding in July 2006 is not a rare case from the viewpoint of absolute shoreline position change","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"15 1","pages":"636-640"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75821023","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}
引用次数: 0
Study on Maintenance of Non-Wave Overtopping Performance of Flaring Shaped Seawall against Sea Level Rise 扩口型海堤抗海平面上升无浪过顶性能的维护研究
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.821
K. Murakami, J. Nitta, D. Maki, Y. Kamikubo, Yasuto Kataoka
{"title":"Study on Maintenance of Non-Wave Overtopping Performance of Flaring Shaped Seawall against Sea Level Rise","authors":"K. Murakami, J. Nitta, D. Maki, Y. Kamikubo, Yasuto Kataoka","doi":"10.2208/PROCE1989.55.821","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.821","url":null,"abstract":"Hydraulic performances of a non-wave overtopping type seawall were investigated on a supposition of the sea level rise that might occur near future. Two-dimensional hydraulic experiments were carried out under some different water level conditions, which reproducing the sea level rise, to clear the effect of the sea level rise on the hydraulic performances of the non-wave overtopping type seawall. Furthermore, this study proposes an appropriate countermeasure against the sea level rise to maintain an excellent checking effect of the wave overtopping of the seawall. Both the efficiencies of the proposed countermeasure and characteristics of the maximum wave pressure acting on it were evaluated through hydraulic experiments.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"63 1","pages":"821-825"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86264851","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}
引用次数: 0
Water Quality of Rainwater and Its Impact on Primary Production in the Osaka Bay 大阪湾雨水水质及其对初级生产的影响
Doboku Gakkai Ronbunshuu B Pub Date : 2008-10-10 DOI: 10.2208/PROCE1989.55.1061
S. Nishida, Yusuke Nakatani, Kyosuke Shimada, Masayasu Irie
{"title":"Water Quality of Rainwater and Its Impact on Primary Production in the Osaka Bay","authors":"S. Nishida, Yusuke Nakatani, Kyosuke Shimada, Masayasu Irie","doi":"10.2208/PROCE1989.55.1061","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1061","url":null,"abstract":"A nutrient load by rainfall has an important role in the primary production in an enclosed bay. We made analyses of rainwater qualities around the Osaka Bay, and calculations for the impact of the precipitation on the water quality and primary production in the Osaka Bay, using a 3D hydrodynamic water-quality model. The rainwater had high concentration of T-N about 0.7mg/L on average for observed rains. The total precipitation loads of T-N, T-P were 1, 300, 11 ton/year, which are only about 3% and 0.4% of total inflow load in the Osaka Bay, respectively. However, calculation results show that the precipitation make phytoplankton biomass increase in the surface layer about 3μg/L in the southwest area of the bay, where the tidal exchange is small and the DIN concentration is very low.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"33 1","pages":"1061-1065"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85665465","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}
引用次数: 1
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