Search Results 1-20 of 52

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  • Examining Anthropogenic Impacts on Vulnerable Fringing Coral Reefs and Shallow Lagoon Areas : A Case Study of the Shiraho Coral Reef, Ishigaki Island  [in Japanese]

    鈴木 倫太郎 , スズキ リンタロウ , Suzuki Rintaro

    … In addition, red soil runoff from nearby rivers and groundwater nutrients continue to degrade the coral reef environment. … This study examines the vulnerabilities that fringing coral reefs are exposed to, using the Shiraho Coral Reef of Ishigaki Island as a case study.<n>The Shiraho Coral Reef has a wide shallow lagoon 800 m in width from the shore and a well-developed reef crest running parallel to the shore from north to south. …

    地域学研究 (33), 75-94, 2020-03

    IR 

  • STUDY ON HYDRAULIC CHARACTERISTICS OF ARTIFICAL REEFS WITH HIGH CROWN HEIGHT  [in Japanese]

    IWASA Takahiro , MIZUNO Yuzou , YAMASHITA Toshihiko , KIMURA Katsutoshi , KATO Fuminori , HIRAI Yasuyuki , NIKAIDO Ryuji , HIRAMA Fumiyasu , TADOKORO Masaya , IIJIMA Naoki , SAITO Koji , YOSHIKAWA Keitaro , NAKATSU Takafumi , KUMAGAI Naoya

    … <p> An artificial reef with high crown height installed at a high ground level near the shore can be considered effective as offshore wave dissipating facility that suppress impact on fisheries while satisfying the prescribed effects of wave reduction and beach stabilization. … In this study, the characteristics of the artificial reef with high crown height was analyzed by plane experiments. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76(2), I_757-I_762, 2020

    J-STAGE 

  • EFFECT OF WATER VELOCITY THROUGH CAISSON JOINTS ON THE CORAL DISTRIBUTION ON BREAKWATERS  [in Japanese]

    TANAYA Toko , KINJO Nobuyuki , IWAMURA Shunpei , AOYAMA Sohei , HASEGAWA Iwao , SUZUKI Kojiro , KUWAE Tomohiro

    … <p> Enhancing coral growth is important given the current declining trend of coral reef ecosystems. … The coral cover increased with increasing width of the caisson joint and become highest around ~1 m. … The flow velocity also increased with increasing width of the caisson joint, indicating that water velocity through caisson joints enhanced ambient coral growth.</p> …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_1147-I_1152, 2019

    J-STAGE 

  • STABILITY EXPERIMENT ON HOLLOW CUBE BLOCK AGAINST IRREGULAR WAVES IN ARTIFICIAL REEF  [in Japanese]

    OGUMA Kouhei , YASUDA Tomohiro , YASUTOMI Shoya , MATSUSHITA Hiroshi , BANDO Akio , NAKANISHI Takashi

    … This study clarified the stability of the hollow cube blocks against irregular waves in artificial reef by conducting hydraulic model experiment. … In the case of the same wave period, it was found that the stability increases by widening the setback width <i>Lm</i> …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74(2), I_366-I_371, 2018

    J-STAGE 

  • DAMAGE PATTERNS OF THE BLOCK MOUND SEAWALL ON A REEF WITH STEEP FORESHORE CONDITIONS DUE TO STORM WAVES  [in Japanese]

    SATO Ryosuke , KIMURA Katsutoshi , YOKOMICHI Tatsuki , NAKOSHI Takao

    …  A block mound seawall, constructed on a reef that follows a steep slope of 1/7 at K-Port in M-Island, was strongly damaged by storm waves in 2009. … The relationship between the number of wave actions and the block damage ratio on the reef was discussed based on the results of block stability tests, and the correction factor for Hudson's formula was newly proposed for several reef width conditions. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 74(2), I_31-I_36, 2018

    IR  J-STAGE 

  • Influence of offshore topography on the amplification of infragravity oscillations within a harbor

    Gao Junliang , Ji Chunyan , Liu Yingyi , Ma Xiaojian , Gaidai Oleg

    … The main purpose of this article is to systematically investigate the influence of offshore fringing reef topography on the infragravity-period harbor oscillations. … Based on an IG wave decomposition method, effects of plane reef-face slopes, reef-face profile shapes and the existence of reef ridge on bound and free IG waves and their relative components inside the harbor are comprehensively studied. …

    Applied Ocean Research (65), 129-141, 2017-04-14

    IR 

  • Larval and Juvenile Fish Communities and Morphodynamic Habitat Conditions in an Open Sandy Shore at Fukiagehama, Southern Kyushu Island, Japan  [in Japanese]

    加藤 めい子 , 須田 有輔 , 南條 楠土

    … Fishes were collected by small experimental beach seine made of 1× 1 mm-meshed knotless net (5.5 m width, 1.5 m deep, 3 m-long fish bag) in the surf zone. … Bottom fishes such as Matsubaraea fusiformis, Paralichthys olivaceus and Tarphops oligolepis dominated intermediate and dissipative sites with smaller wave actions, whereas the reef fishes such as Pempheris schwenkii and Girella sp. …

    水産大学校研究報告 65(3), 121-130, 2017-03

    IR  JASI 

  • A Semi-Analytical Model on Wave-Induced Setup over Fringing Reefs with a Shallow Reef Crest

    Yao Yu , Tang Zhengjiang , Du Ruichao , Jiang Changbo

    … <p>The vulnerability of low-lying reef-fringed atolls to coastal inundation in extreme wave events is of increasing concern in the context of global sea level rise. … Wave-induced setup is an important component of wave runup along reef shorelines. … We improved a semi-analytical model to investigate wave-induced setup over fringing reefs crested by a shallow reef. … Using mass balance and hydraulics, we developed the model based on flow around reef crest kinematics. …

    Journal of Disaster Research 11(5), 948-956, 2016

    J-STAGE 

  • WAVE REDUCTION EFFECT OF AN ARTIFICIAL REEF COMBINED WITH FLARING-SHAPED BLOCK  [in Japanese]

    OTA Takao , MATSUMI Yoshiharu , TAKEHANA Naoto , MURAKAMI Keisuke

    …  This study deals with the wave reduction effect of a new type artificial reef that combines the conventional reef with flaring-shape block to find a possibility for contraction of the crest width. … Two types of the flaring-shape block of unequal size were used in the numerical computation and the results were compared with that of the conventional reef which has a trapezoidal section. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1171-I_1176, 2016

    J-STAGE 

  • Relationship Between Grain Size of Coral Beach and Width of Fringing Reef at East Coast in the Northern Part of Okinawa Island  [in Japanese]

    新垣 夏実 , 前門 晃 , 青木 久 , Arakaki Natsumi , Maekado Akira , Aoki Hisashi , アメリカン エンジニア コーポレィション , 琉球大学 , 東京学芸大学

    本研究では,サンゴ礁海浜を構成する堆積物の粒径に与えるサンゴ礁幅の影響を明らかにするために,沖縄島北部東海岸のサンゴ礁幅の異なる海浜を対象として野外調査を行った.その結果,後浜上限付近のサンゴ礫の粒径は,サンゴ礁幅が大きい海浜ほど小さいという関係が認められた.平均海面付近の海浜堆積物の粒径(D50)においても,サンゴ礁幅(W)が大きくなるにしたがって小さくなる傾向が認められ,その関係はD50 = …

    沖縄地理 (15), 47-52, 2015-06

    IR 

  • A Quantitative Prediction for Shore Break Height on Coral Beaches with a Fringing Reef, Okinawa Island  [in Japanese]

    青木 久 , 武石 裕 , 前門 晃 , Aoki Hisashi , Takeishi Yu , Maekado Akira , 東京学芸大学 , モバイルクリエイト株式会社 , 琉球大学

    … Field measurements were carried out on Yomitan coast with a fringing reef in Okinawa Island, Japan to investigate the relationship between the shore break height (H_b), the reef width(W), the wave height (H') and water depth(h) at the reef edge. …

    沖縄地理 (15), 1-10, 2015-06

    IR 

  • EFFECTS OF BIMODAL ARTIFICIAL REEFS ON WAVE ATTENUTION AND BEACH STABILITY AT KIN-EICHO COAST, NIIGATA  [in Japanese]

    NIKAIDO Ryuji , YAMAMOTO Rei , MIYAMURA Kana , HARA Fumihiro , AOKI Shin-ichi , SASAKURA Nobuo , MORIKOSHI Kenji , OKA Hiroto

    …  This study on bimodal artificial reefs under construction at Kin-eicho coast of Niigata evaluated about wave attenuation by wave observation and beach stabilizing effect by bottom sounding.<br> The comparison result suggests that wave height transmission coefficient of bimodal artificial reefs has higher tendency than the general artificial reef at Ariake coast because the crown width of bimodal artificial reefs at Kin-eicho coast are shorter. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 71(2), I_473-I_478, 2015

    J-STAGE 

  • Surf Zone Ichthyofauna in an Open Sandy Shore at Fukiagehama, Southern Kyushu Island, Japan  [in Japanese]

    須田 有輔 , 中根 幸則 , 大富 潤 [他] , 國森 拓也

    … A long term study on the surf zone ichthyofauna in an open sandy shore at Fukiagehama, southern Kyushu Island was carried out using experimental beach seine with 26 m net width, 2 m depth and 4×4 mm square meshed fish bag, in every spring and autumn from 2000 to 2010 and 2013 with additional summer sampling in 2000, 2001, 2006 and 2007. … The ichthyofauna was also characterized by relatively few species having strong temporal ssociation with surf zone habitat and mixture of demersal, reef and pelagic inhabitants. …

    水産大学校研究報告 63(1), 1-15, 2014-12

    IR  JASI 

  • Discovery of the Waterberg PGE deposits, Bushveld Northern Limb, South Africa  [in Japanese]

    MIYATAKE Shuichi , MIYAUCHI Kei , MASUDA Kazuo , KURIHARA Masaomi , KABASHIMA Taro , SHIMOTORI Hiroshi , KUBOTA Hiroshi

    … Since following several holes surrounding to WB003 also intersected similar mineralization in the same igneous horizon, the JV confirmed that PGE mineralization occurs as a continuous "reef". … T zone is characterized by unusually high gold ratio of 20% in a metal split of Pt, Pd and Au, as a Bushveld PGE reef. … Another deeper PGE reef, F-zone is an igneous horizon located 100m to 450m below the bottom of T-zone. …

    Shigen-Chishitsu 64(2), 85-97, 2014

    J-STAGE 

  • Variation of Impact along the East Coast of Eastern Samar Due to Typhoon Haiyan in the Philippines  [in Japanese]

    GUNASEKARA Kavinda , TAJIMA Yoshimitsu , SHIMOZONO Takenori

    … The coast has various characteristic features such as fringing coral reef, varying beach slopes, pocket beaches and well-developed mangrove forest especially inside Matarinao bay. … It was also found that estimated penetration distance of wave runup on the beach showed certain correlation with the local width of fringing coral reefs. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 70(2), I_241-I_245, 2014

    J-STAGE 

  • A Case Study of Underwater Acoustic and Optical Survey Methods for Monitoring the Biodiversity in an Artificial Mound Reef  [in Japanese]

    NAKAMURA Takeshi

    … This paper introduces a case study of an underwater acoustic and optical surrey method for quantitatively monitoring the biodiversity and marine ecosystem, especially the prey (zooplankton) - predator (fish) relationship in an artificial mound reef. … In that area, an artificial mound reef had been built with width of about 70 m and a height of about 14 m, which were measured by a multibeam echosounder (70-100 kHz). …

    Journal of Fisheries Engineering 50(3), 173-184, 2014

    J-STAGE  JASI 

  • OPTIMUM MEASURES FOR A SCOUR IN THE OPENING OF ARTIFICAIL REEFS AND ACCRETION OF A PORT ENTRANCE AT URADOME BEACH, IN TOTTORI, DUE TO ALTERNATIONS OF THE REEFS  [in Japanese]

    KUROIWA Masamitsu , MATSUBARA Yuhei , MARUMO Yuji , NAKANO Shintaro , ICHIMURA Yasushi , MASE Hajime

    … The causes of the large score hole were due to alternations of the crown height and the width of the artificial reefs. …

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 69(2), I_850-I_855, 2013

    J-STAGE 

  • Study on attachment methods, retention and growth of transplanting coral  [in Japanese]

    ENDO Shubun , PRASETYO Rahmadi , ONAKA Susumu

    … We monitored the transplanted coral intermittently for more than 2 years, by photographing with a digital camera, recording the retention and survival of corals, their attachment to the substrates and the width and height of the coral pieces. … of 5 cm in length reached in average 39.4 cm in width and 28.8 cm in height in 24 months. …

    Galaxea, Journal of Coral Reef Studies 15(Supplement), 330-335, 2013

    J-STAGE 

  • Morphodynamic in the Opening of Artificial Reefs  [in Japanese]

    KUROIWA Masamitsu , MATSUBARA Yuhei , ICHIMURA Yasushi , MARUMO Yuji , NAKANO SHINTARO , TSURU Hideo

    … The scour in the opening of the reefs were remarkably occurred due to extension of the crown-height and width of the reefs. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 68(2), I_566-I_570, 2012

    J-STAGE 

  • Shore Break Height on Beaches with a Fringing Reef : Field Measurements on the Yomitan Coast, Okinawa Island, Japan  [in Japanese]

    AOKI Hisashi , CHIHARA Kenta

    … The Yomitan coast in Okinawa Island, Japan, has little regional difference in input offshore wave characteristics, but has large difference in the width of a fringing reef. … To investigate the relationship between the shore break height (the height of final breaking waves near the shoreline), the reef width and the deep water wave height, field investigations were conducted at four beaches on the Yomitan coast. …

    Transactions,Japanese Geomorphological Union 30(3), 219-226, 2009-07-25

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