Search Results 1-20 of 85

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  • Strong Winds and High Waves Observed at Tanabe-Nakashima Observation Tower in the Summer of 2018  [in Japanese]

    馬場 康之 , 久保 輝広

    … This report shows the field observation results conducted in the summer of 2018. … The intensive field observation has been carried out for two and a half months (from August to November) at the observation tower of Shirahama Oceanographic Observatory. … During the observation, three typhoons (No.20, 21, 24) approached the Kii peninsula, and the typhoon Jebi (No.21) and the typhoon Trami (No.24) brought sever wind and wave conditions. …

    京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B 62(B), 621-625, 2019-09

    IR 

  • RAINFALL OBSERVATION IN THE COASTAL AREA WITH OPTICAL DISDROMETERS IN THE SUMMER OF 2013  [in Japanese]

    OKACHI Hiroki , UCHIYAMA Yusuke , MIZUTANI Hideaki , YAMADA Tomohito J. , WATANABE Yasunori , SARUWATARI Ayumi , OHTSUKA Junichi , MORI Nobuhito , BABA Yasuyuki , KUBO Teruhiro , NINOMIYA Junichi

    … <p> Rainfall observation has been widely performed with ground rain gauges and radars. … In this study, two optical disdrometers are installed at two different heights on an Observational Tower of the Kyoto University Disaster Prevention Research Institute at Wakayama prefecture to have a rainfall observation on the sea in the summer of 2013. … This is considered to be sea spray generated from the sea surface. …

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 75(5), I_41-I_46, 2019

    J-STAGE 

  • STUDY ON ACCESSIBILITY AND DESIGN CONDITION OF OFFSHORE WIND TURBINE BASED ON FIELD OBSERVATION OFF KITA-KYUSYU CITY

    Yoshioka Takeshi , Nakashima Shuusaku , Kawaguchi Koji , Nagai Toshihiko , Nakai Keiji

    … This paper introduces results of a field study using the offshore observation tower system constructed Off Kita-Kyusyu City. … For efficient maintenance of offshore structures such as wind turbines and observation towers, wave conditions were proved to be critical for accessibility evaluation and an empirical diagram was proposed. …

    Grand Renewable Energy proceedings 1(0), 149, 2018

    J-STAGE 

  • Effect of Observation Tower on Wind Flow over the Ocean—First Assessment of the Applicability of Numerical Simulation Using CFD—

    Suzuki Naoya , Waseda Takuji , Michioka Takenobu , Tatsumi Kosuke , Takemoto Takeshi

    … with the wind speed at a height of 10 m above the sea surface, <i>U</i><sub>10</sub>. … As the first approach, we investigated the application of numerical simulations to high-precision observations of flow around the Hiratsuka observation tower of the University of Tokyo using CFD (Computational Fluid Dynamics). … In addition, the flow visualization showed the effect of the observation tower on the wind flow. …

    Journal of Advanced Marine Science and Technology Society 23(1), 11-19, 2017

    J-STAGE 

  • Numerical simulation of air flow around Hiratsuka Tower  [in Japanese]

    Shiraishi Ryo , Michioka Takenobu , Suzuki Naoya

    … An offshore tower is used for measuring a wind velocity over a sea, but the tower affects the wind velocity and wind direction at the location of a sonic anemometer. … It is, therefore, important to determinate an installation position of a sonic anemometer that is less affected by the tower. …

    The Proceedings of The Computational Mechanics Conference 2017.30(0), 043, 2017

    J-STAGE 

  • STUDY ON EXTREME WAVE AND WIND CONDITIONS OF OFFSHORE WIND TURBINES OFF THE KITA-KYUSYU CITY  [in Japanese]

    YOSHIOKA Takeshi , SHIMIZU Shinji , KAWAGUCHI Koji , NAGAI Toshihiko , NAKAI Keiji

    …  Wind and wave characteristics for offshore wind power utilization were investigated off the Kita-kyushu city sea area based on observed field data obtained from newly constructed offshore observation tower system. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73(2), I_761-I_766, 2017

    J-STAGE 

  • INVESTIGATION OF CHARACTERISTICS OF CURRENT UNDER HIGH WAVES IN THE OFFSHORE KITA-KYUSHU  [in Japanese]

    YOSHIOKA Takeshi , SHIMIZU Shinji , KAWAGUCHI Koji , ONO Nobuyuki , NAKAI Keiji , NAGAI Toshihiko

    … At the wind observation tower in the site, continuous observation of wind, wave, and current has been carried out since 2012 and accumulated data under various sea conditions. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73(2), I_767-I_772, 2017

    J-STAGE 

  • STUDY ON ACCESSIBILITY AND DESIGN CONDITIONS OF OFFSHORE WIND TURBINES AROUND JAPANESE COASTAL AREA  [in Japanese]

    YOSHIOKA Takeshi , SAKAMOTO Noboru , KAWAGUCHI Koji , NAGAI Toshihiko , NAKAI Keiji

    …  This paper introduces results obtained from offshore observation tower system off the Kita-Kyusyu city, by comparing results obtained from other Japanese NOWPHAS stations. … There exists a great difference of the accessibility between the Pacific side and the Sea of Japan side, in both winter and summer seasons. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_808-I_813, 2016

    J-STAGE 

  • BIOLOGICAL AND CHEMICAL OXYGEN CONSUMPTION ABOVE THE SEDIMENTS IN THE INNERWESTERN PART OF ARIAKE SEA  [in Japanese]

    TOKUNAGA Takahisa , HAYAMI Yuichi , KIMOTO Katsunori

    …  Oxygen consumption experiment was performed in two fixed points in order to clarify the fractionation of oxygen consumption in the bottom layer of the bay head of Ariake Sea. … In contrast, in an oceanographic observation tower of the Saga University chemical oxygen consumption accounted for 77% of total oxygen consumption. … From these, oxygen consumption process was suggested significantly different in the two observation points. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(1), 12-21, 2016

    J-STAGE 

  • FIELD STUDY CONCERNING INFLUENCE OF WAVE CHARACTERISTICS FOR SUPPORT STRUCTURES OF OFFSHORE WIND TURBINE  [in Japanese]

    YOSHIOKA Takeshi , SAKAMOTO Noboru , AOKI Isao , KAWAGUCHI Koji , NAGAI Toshihiko , NAKAI Keiji

    …  This paper introduces results of field study using the offshore observation tower system constructed off the Kita-Kyusyu city, aiming to clear-up the influence of wave characteristics for the rational design of offshore wind turbine support structures. … It was shown that fluctuations of normal offshore winds were affected by waves and thermal conductions from sea surface. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 71(2), I_143-I_148, 2015

    J-STAGE 

  • Field Measurements at Tanabe-Nakashima Observation Tower in the Summer of 2015  [in Japanese]

    馬場 康之 , 水谷 英朗 , 久保 輝広 , 内山 雄介 , 森 信人 , 渡部 靖憲 , 山田 朋人 , 猿渡 亜由未 , 大塚 淳一 , 二宮 順一

    … This paper shows some results of a field observation carried out in the summer of 2015. … The vertical profiles of currents and water temperature have been measured as well as wave and wind conditions, and salinity observations have been carried out at the observation tower of Shirahama Oceanographic Observatory. …

    京都大学防災研究所年報 (59), 431-437, 2015

    IR 

  • Field Measurements at Tanabe-Nakashima Observation Tower in the Summer of 2014  [in Japanese]

    馬場 康之 , 水谷 英朗 , 久保 輝広 [他] , 内山 雄介 , 森 信人 , 渡部 靖憲 , 山田 朋人 , 猿渡 亜由未 , 大塚 淳一 , 二宮 順一

    … This paper shows some results of a field observation carried out in the summer of 2014. … The vertical profiles of currents and water temperature have been measured as well as wave and wind conditions, and salinity and dissolved oxygen level observations have been carried out at the observation tower of Shirahama Oceanographic Observatory. …

    京都大学防災研究所年報 (58), 315-320, 2014

    IR 

  • Statistical analysis on meteorological conditions of a regional cold air drainage flow at summer night in Kisaichi area  [in Japanese]

    Morimoto Taichi , Nabeshima Minako , Nakao Masaki , Nishioka Masatoshi

    … We set seven parameters using meteorological data from the Katano Fire Department, the Osaka District Meteorological Observatory and the Osaka Bay Wave Observation Tower. …

    Papers on Environmental Information Science ceis27(0), 259-264, 2013

    J-STAGE 

  • CONSTRUCTION OF OCEAN OBSERVATION TOWER SYSTEM OFF THE KITA-KYUSYU CITY FOR OFFSHORE WIND FARM DESIGN  [in Japanese]

    WASHIO Tomoaki , SAKAMOTO Noboru , NAKASHIMA Shuusaku , AOKI Isao , KAWAGUCHI Koji , NAGAI Toshihiko , NAKAI Keiji

    … This paper introduces a marine condition study for offshore wind farm design, by constructing offshore wind and wave observation system with 85m high tower from sea level and with Doppler typed Wave Directional Meter (DWDM) installed on the seabed 14m deep. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 69(2), I_1-I_6, 2013

    J-STAGE 

  • 10023 Report of Underwater Observation Tower : 5th Report, Investigation of Sea Ice Observation Okhotsk Tower  [in Japanese]

    ETO Hiroaki , SAIJO Osamu

    Summaries of technical papers of annual meeting (2012), 45-46, 2012-09-12

    AIJ 

  • Reproduction of Observed Electromagnetic Field Waveforms Produced by Winter Lightning

    ITAMOTO Naoki

    … In this paper, the characteristics of the positive lightning flashes in the coastal area of the Sea of Japan and the lightning stroke model for the estimation of an upward lightning current waveform were described based on observation results. … The positive lightning flashes initiated upward from a radio tower were observed in winter 2001. …

    IEEJ Transactions on Power and Energy 132(6), 548-553, 2012-06-01

    J-STAGE  References (15)

  • Oceanographic Observation Tower and its Application in Ariake Sea  [in Japanese]

    ITO Yuji , KATANO Toshiya , HAYAMI Yuichi , FUJII Naoki

    EICA 16(4), 16-20, 2012-03-15

    References (2)

  • Seasonal and spring-neap tidal changes in ocean structure of the lower Chikugo river estuary based on monitoring data from oceanographic observation tower  [in Japanese]

    ITO Yuji , HAYAMI Yuichi , KATANO Toshiya , KORIYAMA Masumi , Yuji Ito , Yuichi Hayami , Toshiya Katano , Masumi Koriyama , 佐賀大学低平地沿岸海域研究センター , 佐賀大学低平地沿岸海域研究センター , 佐賀大学低平地沿岸海域研究センター , 佐賀大学農学部 , Institute of Lowland and Marine Research Saga University , Institute of Lowland and Marine Research Saga University , Institute of Lowland and Marine Research Saga University , Faculty of Agriculture Saga University

    … <p>Results from the continuous measurement with the oceanographic observation tower of the Saga University show the detailed seasonal variation in structure of the lower Chikugo river estuary. … After the flood in the rainy season, low saline water discharge from the river to sea surface produced a strong-stratified type. …

    Oceanography in Japan 21(1), 1-16, 2012-01-15

    J-STAGE  References (22) Cited by (2)

  • IN-SITU MEASUREMENT OF MERUCRY FORM AND TRANSPORT IN THE SEA WATER OF MINAMATA BAY  [in Japanese]

    YANO SHINICHIRO , TAI AKIRA , YANO KOHEI , MATSUYAMA AKITO , FUJIWARA RYUJI , TADA AKIHIDE , SONODA IKUKO , RIOGILANG HERAWATY

    … First, we conducted highly-frequent (weekly) water sampling for mercury speciation in sea water with continuous current measurement at an observation tower during summer season. … iii) Annual particulate T-Hg and MeHg transport from Minamata Bay to the Yatsushiro Sea was estimated as 6kg and 0.05kg, respectively; …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 68(4), I_1567-I_1572, 2012

    J-STAGE 

  • A201 Wind Turbulent Spectra Analysis of Land and Sea Breeze at Seashore Area of Hirono Town  [in Japanese]

    NAGAI Hiroshi

    … The observation of wind climate for one year is carried out at a 50m tower on the Hirono seashore for development of wind power on the ocean. … At the same time, spectral analysis was conducted in order to evaluate disorder of a wind using the observation result of half a year. … On the other hand, the sea breeze has little number of appearance times, and expectation wind speed is high and suitable for wind power generation. …

    The Proceedings of the National Symposium on Power and Energy Systems 2012.17(0), 209-210, 2012

    J-STAGE 

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