Search Results 1-20 of 59

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  • EXPERIMENTAL STUDY ON BEHAVIOR OF NON-LINEARITY AND OCCURRENCE OF MAXIMUM WAVE HEIGHT ON SLOPE  [in Japanese]

    KASHIMA Hiroaki , MORI Nobuhito

    … In this study, a series of physical experiments with several slope bottoms were conducted to investigate the transient behavior of the high-order nonlinear wave properties and the extreme wave occurrence on the slope, including in the surf zone. … As a results, the kurtosis on the slope follows the skewness changing developed by the second-order nonlinear interactions associated with wave shoaling and its behavior depends on the breaker type. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_43-I_48, 2020

    J-STAGE 

  • WAVE BREAKER TYPES AND SURF ZONE HYDRAULICS  [in Japanese]

    仲座 栄三 , 田中 聡 , 本屋敷 涼 , 宮里 信寿 , 福森 匡泰 , SCHAAB Carolyn

    土木学会論文集. B2, 海岸工学 Journal of Japan Society of Civil Engineers. 土木学会海岸工学委員会 編 75(2), I_79-84, 2019

  • WAVE BREAKER TYPES AND SURF ZONE HYDRAULICS  [in Japanese]

    NAKAZA Eizo , TANAKA Satoshi , MOTOYASHIKI Ryo , MIYAZATO Nobutoshi , FUKUMORI Masahiro , SCHAAB Carolyn

    … <p> Using CADMAS-SURF numerical simulation models the generation mechanisms of wave breaker types are explained clearly. … The strength of the return flow in the very thin layer adjacent to the water surface of the wave front plays a vital role in determining the type of wave breaker that occurs. … In addition to the 4 types of wave breakers shown in previous research, the existence of a resonance mode breaker is newly revealed. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_79-I_84, 2019

    J-STAGE 

  • LABORATORY EXPERIMENTS OF SEDIMENT MIXING AND THE EFFECT OF BOTTOM EDDIES  [in Japanese]

    GUNARATNA Thamali , AKIMOTO Saki , SUZUKI Takayuki

    … Using fluorescent sand tracers and core sample methods, the spatial and temporal variation in the mixing depths in the surf zone are investigated. … The results indicate that the plunging breaker type of sediment mixing pattern in space within the wave breaking zone correlates with the spatial distribution of the maximum bottom horizontal eddies. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74(2), I_737-I_742, 2018

    J-STAGE 

  • Activities of the training vessel Umitaka-maru (KARE-17; UM-13-09) of the Tokyo University of Marine Science and Technology during the 55th Japanese Antarctic Research Expedition in 2013/2014  [in Japanese]

    茂木 正人

    … The Umitaka-maru departed from Fremantle, Australia, on 11 January 2014, sailed to the study area around the marginal sea ice zone along 110°E, and returned to Hobart, Australia, on 5 February 2014. … Physical and chemical Oceanographic observations, using a CTD (Conductivity Temperature Depth profiler) deployed to near the seafloor in the marginal ice zone revealed detail property of the Antarctic bottom water. …

    南極資料 = Antarctic Record (60), 117-132, 2016-11

    IR  DOI 

  • Activities of the training vessel Umitaka-maru (KARE-15; UM-11-07) of the Tokyo University of Marine Science and Technology during the 53rd Japanese Antarctic Research Expedition in 2011/2012  [in Japanese]

    茂木 正人 , Masato Moteki

    … The Umitaka-maru departed from Fremantle, Australia, on 27 December 2011, sailed to the study area around the marginal sea ice zone (mainly along 110°E and 140°E), and returned to Hobart, Australia, on 1 February 2012. … They also retrieved a year-round mooring that had been deployed the previous year, retrieved two surface drifting buoys that had been released by the ice breaker Shirase, and deployed a JAMSTEC buoy (m-TRITON). …

    南極資料 59(3), 295-313, 2015-11

    IR  DOI 

  • THE ANALYSIS OF WAVE, CURRENT AND SEDIMENT TRANSPORT AFFECTED BY TYPHOON IN THE SURF ZONE OF MIYAZAKI COAST  [in Japanese]

    SATO Shinji , KONDOH Ryuzi , TAKEBAYASHI Hideki , TAKESHITA Shinji , TSUTSUMI Hironori , SHIMODA Katsunori , UENO Masahiro , MURAKAMI Keisuke , SUWA Yoshio , NISHI Ryuichiro , MATSUDA Hiroki , OHNO Masahiro , SUGIURA Yukihiko , TAKASHIMA Soutarou , ISHIZAKI Kimiyasu

    … Longshore sand transport was estimated on the basis of breaker heights and longshore current velocities. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71(2), I_67-I_72, 2015

    J-STAGE 

  • A Study on the Shoreline Variations of Long Sandy Beach with Artificial Headlands  [in Japanese]

    AN Seunghyun , TAKEWAKA Satoshi

    … Morphology around headlands and locations of breaker line are examined. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 70(2), I_591-I_595, 2014

    J-STAGE 

  • Distribution of ayu <i>Plecoglossus altivelis</i> larvae and juveniles in the coastal area around the Kuji River estuary, Ibaraki Prefecture, central Japan  [in Japanese]

    ARAYAMA KAZUNORI , SUNOH NORIYUKI , YAMAZAKI YUKIO

    … The first occurrence of the larvae was found at the offshore zone beyond the breaker zone of sandy beaches. … Moreover, the offshore zone beyond the breaker zone of sandy beaches was important for larvae recruited to the nursery areas.<br> …

    NIPPON SUISAN GAKKAISHI 80(5), 713-725, 2014

    J-STAGE  JASI 

  • Study on Numerical Analysis for Sediment Transport around Permeable Detached Breakwaters

    NISHIHATA Takeshi , TAJIMA Yoshimitsu , SATO Shinji

    … In the model, increase in friction velocity induced by plunging breaker was introduced which enhanced the erosion inside the surf zone. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 67(2), I_516-I_520, 2011

    J-STAGE 

  • Analysis of Flow Field in Surf Zone by Accurate Particle Method with SPS Turbulence Model

    HORI Chiemi , GOTOH Hitoshi , IKARI Hiroyuki , KHAYYER Abbas

    … A spilling breaker is simulated and its turbulent characteristics are analyzed. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 67(2), I_26-I_30, 2011

    J-STAGE 

  • FET-type High Efficiency driving Circuit for High-power LED Lamps  [in Japanese]

    Horimoto Shoji , Sato sho , Kawanishi Daisuke , Sakamoto Yasutada

    … The inrush current is a huge charging current that flows into the smoothing capacitor immediately after having turned on power, and it causes various problems such as the interception of the breaker, welding of the power switch, and stresses to the circuit element. … Moreover, the change of the power-supply voltage is a factor of the decrease in efficiency and brightness 10 the V changes by the region and time zone in commercial power source . …

    Proceedings of Annual Conference of The Illuminating Engineering Institute of Japan 43(0), 86-86, 2010

    J-STAGE 

  • Seepage flow in a breaker zone  [in Japanese]

    柿沼 太郎 , 大石 静 , 山本 洋平 [他]

    Journal of coastal engineering, JSCE 56-1, 126-130, 2009-10

  • Seepage Flow in a Breaker Zone

    KAKINUMA Taro , OHISHI Shizuka , YAMAMOTO Youhei , NAKAMURA Kazuo , KITAMURA Yoshisuke

    … Seepage velocity in a breaker zone was measured with dye for visualization. … The pore water pressure in the breaker zone showed time variation depending on the wave phase including wave breaking and bore propagation. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 65(1), 126-130, 2009

    J-STAGE 

  • Relationship between oil residues from Nakhodka and coastal topography in breaker zone of gravel beach  [in Japanese]

    濱田 誠一 , 沢野 伸浩 , 後藤 真太郎

    Journal of coastal zone studies 20(4), 83-88, 2008

  • Time-Space Fluctuation of Rip Current Measured in Very Shallow Region

    DEGUCHI Ichiro , NOMURA Naoki , TSUTSUI Kengo , ARITA Mamoru

    … Spatial variation of time varying rip current and surface displacements around a rip channel were measured by arrayed five wave gauges and current meters in the breaker zone. …

    PROCEEDINGS OF COASTAL ENGINEERING, JSCE (55), 81-85, 2008

    J-STAGE 

  • Reanalysis of Breaking Wave Statistics for Engineering Applications

    GODA Yoshimi

    … The bed slope effect in the breaker index formula by Goda (1973) is reduced in a newly revised formula. … The breaker index of regular waves should be treated as a statistical variable with the coefficient of variation ranging from 5% to 14%. …

    PROCEEDINGS OF COASTAL ENGINEERING, JSCE (54), 81-85, 2007

    J-STAGE 

  • THE EFFECT OF WAVE-INDUCED MASS TRANSPORT ON NET SHEETFLOW TRANSPORT RATE

    HONDA Takahide , SATO Shinji , ISOBE Masahiko

    … The model was then applied to the sheet flow transport in the outer surf zone for large wave tank experiments, which improved the prediction of bar generation near the breaker zonei. …

    Doboku Gakkai Ronbunshuu B 62(1), 139-149, 2006

    J-STAGE 

  • REVISION OF 3-D RANDOM WAVE TRANSFORMATION MODEL WITH GRADATIONAL BREAKER INDEX  [in Japanese]

    GODA Yoshimi

    … A directional spectral wave transformation model with random breaking in 3-D bathymetry was presented by the author in 2002 with introduction of a gradational breaker index into a parabolic equation. … The model is presently revised with introduction of a secondary gradational breaker index for of negative seabed slope to account for wave decay in the trough zone of a barred beach. …

    PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN (19), 141-146, 2003

    J-STAGE 

  • Field Survey on the Mechanism of Sediment Transport in the Ishikari coastal wide-area  [in Japanese]

    HONMA Daisuke , KUBOUCHI Atsushi , SAKIKAWA Mitsuhiro , SUZUMURA Akihiro , SUMIE Jyunya , YAMASITA Toshihiko

    … Research on sea sand drift has thus far targeted relatively shallow sea areas, such as the breaker zone.For wide-area sediment management, however, study should be extended to include the role of grain size in sand drift and to include sand drift in deep-sea areas. … As a result of the field survey in the outer breaker zone, a large sediment transport was found. …

    PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN (19), 369-372, 2003

    J-STAGE 

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