Search Results 1-20 of 36

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  • BEACH DEFORMATION ANALYSIS BY COMBINING NETWORK CAMERA AND UAV-SFM/MVS SURVEY  [in Japanese]

    CHO Yonghwan , NAKAYAMA Ryoya , KIKU Masami , NAKAMURA Tomoaki , MIZUTANI Norimi

    … <p> This study describes the improvement of the image analysis of network camera using the orthomosaic created from UAV-SfM/MVS survey and the morphological characteristics of Shichiri-Mihama Ida beach based on the estimated shoreline positions extracted by a network camera and DEM obtained by UAV-SfM/MVS survey. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_655-I_660, 2020

    J-STAGE 

  • MONITORING OF SHORELINE POSITIONS USING OPEN SATELLITE IMAGES  [in Japanese]

    HASHIGUCHI Kyota , TAKEWAKA Satoshi

    … <p> Quasi-high-resolution open satellite images were collected from the Internet to extract seasonal variation of wide-area shorelines positions. … The shoreline positions were read every 10 m from 78 scenes taken between 2010 and 2019. … The result shows wavy distribution of shoreline position in the vicinities of break water and jetty, and also variational tendencies (accumulation or retreat) which are consistent with previous studies. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 76(2), I_654-I_659, 2020

    J-STAGE 

  • Automatic Shoreline Position and Intertidal Foreshore Slope Detection from X-Band Radar Images using Modified Temporal Waterline Method with Corrected Wave Run-up

    武若 聡 , Dipankar Kumar , Satoshi TAKEWAKA

    … Automatic and accurate shoreline position and intertidal foreshore slope detection are challenging and significantly important for coastal dynamics. … In the present study, a time series shoreline position and intertidal foreshore slope have been automatically detected using modified Temporal Waterline Method (mTWM) from time-averaged X-band radar images captured throughout the course of two-week tidal cycle variation over an area spanning 5.6 km on the Hasaki coast between 12 April 2005 and 31 December 2008. …

    Journal of Marine Science and Engineering 7(2), 45, 2019-02

    IR 

  • ASSESSING THE APPLICABILITY AND ERROR FACTORS OF THE SHORELINE MONITORING SYSTEM BASED ON SATELLITE SAR IMAGES  [in Japanese]

    WATANABE Kunihiro , KATO Fuminori , SANO Takio

    … <p> Shoreline extraction from satellite synthetic aperture radar (SAR) images (L-band) was examined for 18 coasts. … The success rates of the extraction and the accuracies of the extracted shoreline positions were evaluated, and the applicability of the method was assessed. … Shoreline extraction was not successful when the off-nadir angle of observation exceeded 40 degrees. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_1285-I_1290, 2019

    J-STAGE 

  • Shoreline Change around a River Delta on the Cox's Bazar Coast of Bangladesh

    武若 聡 , Upal Mahamud , Satoshi TAKEWAKA

    … Shoreline positions for a 44-year (1972–2016) period were digitized using Landsat images. …

    Journal of Marine Science and Engineering 6(3), 80, 2018-07

    IR 

  • STUDY ON SHORELINE VARIABILITIES OF SOUTHERN KASHIMANADA COAST ANALYZED FROM FREQUENTLY OBSERVED SAR DATA  [in Japanese]

    TAKEWAKA Satoshi , MATSUMOTO Akimasa , EBIHARA Yuuki

    …  Variation of shoreline positions of 16 km-long sandy Kashima Coast, a littoral cell, with Kashima Port at the north end and Hasaki Fishery Port at the southern end, has been observed from SAR (Synthetic Aperture Radar) satellite. … First, bulk statistics of shoreline position variations are discussed. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_985-I_990, 2018

    IR  J-STAGE 

  • Estimation of Shoreline Positions by Combining X-band Radar and SAR Observations  [in Japanese]

    KUMAR Dipankar , TAKEWAKA Satoshi

    …  Shoreline positions of Kashima Coast facing the Pacific Ocean, which is approximately 16 km long with Hasaki Fishery Port at the south end and Kashima Port at the north end, have been observed with four land-based X-band radars and Synthetic Aperture Radar (SAR) satellite. … X-band radars observe shoreline positions continuously in time but do not cover the whole coast. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_979-I_984, 2018

    IR  J-STAGE 

  • STUDY ON SHORELINE VARIABILITIES OBSERVED AT THE SOUTHERN END OF KASHIMANADA COAST  [in Japanese]

    TAKEWAKA Satoshi , WEN Tianyue

    …  Variation of shoreline position at the southern end of 17 km-long Kashima Coast, with Kashima Port at the north end and Hasaki Fishery Port at the southern end, has been observed with a X-band radar for 6 years. … The radar captures hourly distribution of shoreline position approximately over 4 km. … Shoreline positions of approximately every 2 days have been digitized from the radar images. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_679-I_684, 2017

    IR  J-STAGE 

  • HIGH-FREQUENCY BEACH MONITORING WITH UAV PHOTOGRAMMETRY  [in Japanese]

    SUZUKI Akihiro , MITOBE Yuta , TANAKA Hitoshi , ROEBER Volker

    … A conventional method of shoreline analysis was firstly applied to see the short-term recovery of shoreline positions after a big typhoon event in 2016. … And also the effect of a tsunami event in November 2016 on beach morphological changes around the river mouth was discussed through the shoreline change analysis and 3D shape analysis. … More than ten meters of shoreline change often occurred during this period. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_661-I_666, 2017

    J-STAGE 

  • MORPHOLOGICAL CHANGE ON SENDAI COAST BY TYPHOON NO. 10, 2016  [in Japanese]

    MITOBE Yuta , TANAKA Hitoshi , SUZUKI Akihiro , UMEDA Makoto , KOMORI Daisuke , TOUGE Yoshiya

    … Due to overtopping of high waves over sand dune, some amount of sediment was transported into Gamo Lagoon.<br> 20 ~ 30 m retreat of shoreline was observed through shoreline analysis based on aerial photographs taken before and after the typhoon. … In one or two months after the event, shoreline positions almost reached to the positions before the typhoon mainly due to the contribution of the cross-shore sediment transport. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 73(2), I_552-I_557, 2017

    J-STAGE 

  • Temporal variation of shoreline positions on Cua Dai beach, Vietnam

    Dinh Van Duy , Tanaka Hitoshi , Mitobe Yuta [他]

    東北地域災害科学研究 = Tohoku journal of natural disaster science 52, 151-156, 2016-03

  • RECOVERY OF LITTORAL SYSTEM ON SENDAI COAST AFTER THE GREAT EAST JAPAN EARTHQUAKE TSUNAMI  [in Japanese]

    HOANG Vo Cong , TANAKA Hitoshi , MITOBE Yuta

    … By adding two more years of shoreline position data extracted from aerial photographs and utilizing the Empirical Orthogonal Function (EOF) analysis, the recovery of littoral system of the coast can be revealed. … Results indicate that the shoreline has not been in equilibrium condition yet. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_769-I_774, 2016

    J-STAGE 

  • SHORELINE POSITIONS AND BOTTOM PROFILES RETRIEVED FROM SYNTHETIC APERTURE RADAR  [in Japanese]

    YUKIKAWA Shuhei , MATSUMOTO Akimasa , TAKEWAKA Satoshi

    …  Synthetic Aperture Radar (SAR) is a powerful tool in retrieving shoreline positions and surface wave patterns in the nearshore, since it can gather scenes in any weather condition. … In this study, several scenes which captured Kashimanada Coast, Japan were analyzed to infer the usability of SAR data to extract shoreline positions and wave number variations in the nearshore, and also the influence of various parameters in the observation is discussed. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1735-I_1740, 2016

    J-STAGE 

  • TIDAL CORRECTION METHOD FOR SHORELINE POSITION EXTRACTED FROM GOOGLE EARTH IMAGES  [in Japanese]

    HOANG Vo Cong , TANAKA Hitoshi , MITOBE Yuta , DUY Dinh Van

    …  It is common to realize in literatures that shoreline position extracted from unknown capture time aerial photograph or satellite image (hereafter referring both kinds as image) has not been corrected to tidal effect. … However, the correction of tide for shoreline position extracted from image is highly required for studies in the field of coastal morphology changes. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_61-I_66, 2016

    J-STAGE 

  • COMPARISON BETWEEN CHARACTERISTICS OF SHORELINE CHANGES DUE TO THE 2004 INDIAN OCEAN TSUNAMI AND THE 2011 GREAT EAST JAPAN TSUNAMI  [in Japanese]

    UDO Keiko , TAKEDA Yuriko

    …  This study compares the characteristics of shoreline change, i.e. erosion and recovery, of damaged coasts in Indonesia and Thailand due to the 2004 Indian Ocean Tsunami, with those of a damaged coast in eastern Japan due to the 2011 Great East Japan Tsunami. … The results shows two major characteristics: (i) sand bar erosion and recovery at different positions and (ii) serious coastal erosion and insufficient recovery. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_175-I_180, 2016

    J-STAGE 

  • THEORETICAL STUDY ON THE RECOVERY PROCESS OF THE CONCAVE LANDFORM AFTER THE TSUNAMI  [in Japanese]

    VO Hoang Cong , TANAKA Hitoshi , MITOBE Yuta

    … These damages formed concave shoreline at this area after the tsunami. … Results indicate that coastal structures at both ends have major impact on the shoreline evolution. … A new analytical solution of one-line model, which describes the evolution of shoreline of concave landform bounded by rigid boundaries, has been introduced. … Good agreement between measured shoreline positions and simulated results is also obtained. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 71(4), I_31-I_36, 2015

    J-STAGE 

  • 10 YEARS CROSS-SHORE AND ALONGSHORE SHORELINE VARIABILITIES OBSERVED AT HASAKI COAST, JAPAN  [in Japanese]

    TAKEWAKA Satoshi , GALAL Elsayed M.

    …  Distribution of shoreline positions from year 2005 to 2014 was observed with an X-band radar at Hasaki Coast, Japan. … The spatial and temporal variability of the shoreline positions is split by Empirical Orthogonal Functions decomposition. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71(2), I_673-I_678, 2015

    J-STAGE 

  • ENVIRONMENTAL VARIATION OF SEDIMENT TRANSPORT DUE TO TSUNAMI AROUND DETACHED BREAKWATERS  [in Japanese]

    MORI Fumiaki , MITOBE Yuta , TANAKA Hitoshi

    … Shoreline variation is obtained from pre- and post-tsunami aerial photographs. … It is found that after the tsunami, shoreline behind six detached breakwaters has been advancing, while shoreline in the northern area of the detached breakwaters has been retreating. … Empirical Orthogonal Function (EOF) analysis is applied to decompose shoreline positions. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 71(2), I_647-I_652, 2015

    J-STAGE 

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

    AN Seunghyun , TAKEWAKA Satoshi

    … This study focuses on the annual variations of shoreline configurations around three headlands established along a long sandy beach at Kashima coast, Ibaraki. … With results of radar measurement, shoreline position, intertidal beach slope, and beach volumes are estimated by data analyses. … Seasonal features of shoreline position are discussed in terms of seasonal wave conditions. …

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

    J-STAGE 

  • Modification of Littoral System due to the 2011 Tsunami  [in Japanese]

    CONG Hoang Vo , MITOBE Yuta , TANAKA Hitoshi , NGUYEN Trung Viet

    … Empirical Orthogonal Function (EOF) analysis is applied to shoreline positions extracted from the aerial photographs. … The first and third modes express the recovery process of shoreline from the severe erosion with respective time-scale, and the superposition of their contribution rate is more than 70%. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 70(2), I_521-I_525, 2014

    J-STAGE 

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