Search Results 1-20 of 366

  • Responses of Polar Mesocyclone Genesis to Topographic Forcing along the Eastern Coast of Eurasian Continent

    TAMURA Kenta , SATO Tomonori

    … In this study, topographic effects on PMC genesis in this region were examined using long-term numerical simulations extending over 36 winter seasons. … In contrast, the low-level wind over the Strait of Tartary prior to PMC genesis is unaffected by the mountains and thus topographic effects are not required for PMC genesis in this region. …

    Journal of the Meteorological Society of Japan. Ser. II, 2020

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  • Effects of Topography and Geological Structure on Runoff at Sedimentary Rock Mountains  [in Japanese]

    Inaoka Jun , Kosugi Ken'ichirou , Masaoka Naoya , Tani Tomoyuki , Itokazu Tetsushi

    … TWI (Topographic Wetness Index) を指標として地形の影響を検討した結果、各流域の降雨流出の特徴と地形との間に明確な対応関係はみられなかった。 …

    The Japanese Forest Society Congress 131(0), 569, 2020

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  • Characteristics, Physical Mechanisms, and Prediction of Pre-summer Rainfall over South China: Research Progress during 2008–2019

    Luo Yali , Xia Rudi , Chan Johnny C. L.

    … The warm-sector rainfall over inland SC results from surface heating, local topographic lifting, and urban heat island effects interacting with the sea breeze. …

    Journal of the Meteorological Society of Japan. Ser. II 98(1), 19-42, 2020

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  • Numerical Prediction of Strong Wind Induced by Topographic Effect

    Uchida Takanori

    … Attention is focused on the mechanism of a local strong wind induced by a topographic effect. … In order to clarify the mechanism of the occurrence of strong winds accompanied by the effects of terrain, the use of a numerical simulation is very effective, in which conditions can be set without the influence of ground roughness and temperature distribution. …

    Open Journal of Fluid Dynamics 9(3), 224-240, 2019-08-19

    IR 

  • Monochromatic infrasound waves observed during the 2014-2015 eruption of Aso volcano, Japan

    Yokoo Akihiko , Ishii Kyoka , Ohkura Takahiro , Kim Keehoon

    … The source location of the signals estimated by considering topographic effects and atmospheric conditions was highly stable at the active vent. … Based on finite-difference time-domain modeling using 3-D topographic data of the crater during the eruption (March 2015), we calculated the propagation of infrasound waves from the conduit. …

    Earth, Planets and Space (71), 2019-01-31

    IR 

  • Fully nonlinear simple internal waves over subcritical slopes in continuously stratified fluids: Theoretical development

    Shimizu Kenji

    … The dynamics of fully nonlinear internal waves in continuously stratified fluids is investigated using a new simple-wave (or Riemann-wave) theory with 2nd-order topographic effects. … An essential step in the theoretical development is the separation of "adiabatic" and "diabatic" topographic effects. …

    Physics of Fluids 31(1), 016601, 2019-01

    IR 

  • RELATIONSHIP BETWEEN BUILDING DISTRIBUTION AND TSUNAMI OVERTURNING MOMENT  [in Japanese]

    OKUMURA Yoshihiro , BANDO Naoki , SHIKATA Tamotsu , YONEYAMA Nozomu , KIYONO Junji

    <p> 2011年東北地方太平洋沖地震津波では,建物に作用する津波水平力による転倒モーメントが周辺建物によって増大していたことを示唆する結果が示されている.しかし,どのような周辺建物配置や地形の際に,モーメントが増大するのかについては十分に明らかにされていない.本研究では,一般的な条件下において,周辺建物の配置,周辺建物の大きさ,地形の勾配に注目し,周辺建物と対象建物にかかる転倒モーメ …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_871-I_876, 2019

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  • ANALYSIS OF SAND DEPOSITION MECHANISM IN ARTIFICIAL REEFS ONSHORE - A CASE STUDY IN SHIRAOI SECTION, IBURI COAST-  [in Japanese]

    NIKAIDO Ryuji , KAMEDA Chisa , IGARASHI Yusuke , OTSUKA Kenta , MATSUI Hiroyuki , AMANO Naoya

    <p> 本研究は,胆振海岸白老工区の人工リーフ整備による前浜形成状況に関して,外力・地形等の実態分析,波・流れの数値シミュレーションを行うとともに,既往研究の知見を活用して,そのメカニズムを分析・考察した.胆振海岸白老工区では,人工リーフ整備後に前浜が顕著に堆積し,その後も安定している様子が確認できた.人工リーフの整備により,このような海浜安定効果が見られた事例は珍しい.この要因として …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_661-I_666, 2019

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  • SHORT-TERM MORPHOLOGICAL CHANGES AND SEDIMENT DYNAMICS OF TIDAL FLAT DUE TO TYPHOON PASSAGE  [in Japanese]

    KURITANI Itsuki , KATO Shigeru , TABATA Takahiro , NAKAMURA Ryota , OKABE Takumi

    <p> 愛知県西尾市東幡豆町に位置する前島トンボロ干潟は,多様な生物が生息する豊かな自然を残している干潟である.しかしながら,台風の接近・通過による海象条件の変化によって地形に強力なインパクトが与えられると,短期間に顕著な地形変化が生じることが報告されている.地球温暖化等の影響により,今後,台風の強大化や異常気象の発生が懸念されている.それにより,干潟の地形変化が顕著になるだけでなく, …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_499-I_504, 2019

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  • CHARACTERISTICS OF SEDIMENT TRANSPORT IN SWASH ZONE ACCORDING TO GRANULARITY OF BOTTOM SEDIMENT  [in Japanese]

    OCHI Masashi , WADA Kyouka , MIYATAKE Makoto , SASSA Shinji

    <p> 著者らが過去に実施した画像計測法および漂砂移動可視化実験において,底質混合粒径の粒度分布を変化させた場合の適用性を検証した後,底質の粗粒化に伴う漂砂濃度や地下水変動の計測結果から,底質を構成する粒度分布が縦断地形変化へ及ぼす影響を評価した.その結果,画像解析による漂砂計測は,異なる粒度分布においても適用可能であることを確認した.また,漂砂移動可視化実験より,底質が粗配合の場合, …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_463-I_468, 2019

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  • A MODEL FOR PREDICTING 3-D TOPOGRAPHIC CHANGES DUE TO WINDBLOWN SAND AND WAVES  [in Japanese]

    YOKOTA Takuya , KOBAYASHI Akio , UDA Takaaki , SERIZAWA Masumi , NOSHI Yasuhito , KATSUKI Atsunari

    <p> 飛砂の卓越する海岸において,海浜部から海浜背後までの広範囲の地形変化予測が可能な,波による漂砂と飛砂を同時に考慮した地形変化予測モデルを開発した.海浜部での波による地形変化の計算にはBGモデル(Bagnold概念に基づく3次元海浜変形予測モデル)を,バームより陸側の飛砂による地形変化の計算にはセルオートマトン法を用いた.モデルの妥当性を検討するために,富津新港の防波堤隅角部に形 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_469-I_474, 2019

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  • Development of Lineament Extraction Method based on Topography Characteristics and Segment Tracing Algorithm (STA) using Digital Elevation Model  [in Japanese]

    NAKAO Daiki , MASUMOTO Shinji , NEMOTO Tatsuya

    <p>数値標高モデル(DEM)を用いてリニアメントを抽出する有効な方法の1つとして線素追跡アルゴリズム(STA)がある.しかし,STAにより得られるリニアメントは地形の陰影画像上で見られる線状構造であり,地形の特徴と直接的に関連づけられていない.本研究では,断層や撓曲に関連したリニアメントをより直接的に抽出するために,DEMの地形特徴から識別される線素を用いたリニアメントの抽出方法をS …

    Geoinformatics 30(3), 87-100, 2019

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  • Sensitivity of potential evapotranspiration to climate factors in forested mountainous watersheds  [in Japanese]

    Ghiami-Shomami Fereshteh , Kawasaki Kohzo , Leonardo , Shinoda Seirou , Fan Yanyang

    … Sensitivity analysis was employed to illustrate the effects of perturbation in meteorological parameters (maximum and minimum air temperature (<i>T</i><sub>max</sub> … to changes in climatic parameters differs for sites with different topographic and geographic characteristics.</p> …

    Hydrological Research Letters 13(3), 41-48, 2019

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  • Temporal variation in the resistivity structure of the first Nakadake crater, Aso volcano, Japan, during the magmatic eruptions from November 2014 to May 2015, as inferred by the ACTIVE electromagnetic monitoring system

    Minami Takuto , Utsugi Mitsuru , Utada Hisashi , Kagiyama Tsuneomi , Inoue Hiroyuki

    … An unstructured tetrahedral finite element three-dimensional inversion that accounted for topographic effects was used to interpret temporal variations in the ACTIVE response. …

    Earth, Planets and Space 70(1), 2018-12

    IR 

  • Statistical analysis of dispersal and deposition patterns of volcanic emissions from Mt. Sakurajima, Japan

    Poulidis Alexandros P. , Takemi Tetsuya , Shimizu Atsushi , Iguchi Masato , Jenkins Susanna F.

    … Climatological and topographic effects are suspected to impact the deposition of volcanic ash away from the vent: for sampling stations located close to complex topographical elements, sharp changes in the deposition patterns were observed, with ash deposits for neighbouring stations as close as 5 km differing as much as an order of magnitude. …

    Atmospheric Environment (179), 305-320, 2018-04

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  • Effects of topographic attributes on landscape pattern metrics based on redundancy ordination gradient analysis

    Zhang Zhiming , Zinda John Aloysius , Yang Zijiang , Yin Mei , Ou Xiaokun , Xu Qian , Yu Qiaochu

    Landscape and ecological engineering : official journal of the International Consortium of Landscape and Ecological Engineering (ICLEE) 14(1), 67-77, 2018-01

  • EFFECTS ANALYSIS OF HEADLAND AND ARTIFICIAL REEF FOR NOURISHMENT AT KIN-EICHO COAST, NIIGATA  [in Japanese]

    二階堂 竜司 , 五十嵐 雄介 , 小山 英夫 , 中園 大介 , 原 文宏 , 土井 康義

    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 74(2), I_955-960, 2018

  • Topographic Feature Analysis of <i>Sasa kurilensis </i>Expanding Part and Extraction of Potentially Easy to Expand Habitat at the Alpine Snow-meadow in the Taisetsu Mountains, Northern Japan  [in Japanese]

    AMAGAI Yukihiro , KANEKO Masami

    … <p>Alpine ecosystems are particularly vulnerable to the effects of climate change. …

    Journal of The Remote Sensing Society of Japan 38(4), 337-343, 2018

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  • Predicting Effects of Logging Systems and Bucking Strategies forPrivately Owned Sugi (<i>Cryptomeria japonica</i>) Plantations in Atsumi District, Tsuruoka City, Yamagata Prefecture

    Suzuki Komei , Tatsuhara Satoshi , Nakajima Tohru , Kanomata Hidesato , Oka Masaru

    … We create forest management units with areas greater than three hectares by merging stands and defining topographic conditions using a geographic information system. …

    Journal of Forest Planning 24(2), 15-27, 2018

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  • EFFECTS ANALYSIS OF HEADLAND AND ARTIFICIAL REEF FOR NOURISHMENT AT KIN-EICHO COAST, NIIGATA  [in Japanese]

    NIKAIDO Ryuji , IGARASHI Yusuke , KOYAMA Hideo , NAKAZONO Daisuke , HARA Fumihiro , DOI Yasuyoshi

    新潟海岸金衛町工区は,自然由来の土砂供給が期待できないことから,海浜安定化のためにヘッドランドと人工リーフ(ふた山型構造)による静的安定手法が採用された.本研究は,金衛町第2工区を対象として,現地観測と数値シミュレーションよりヘッドランドと人工リーフ周辺の波・流れを分析するとともに,測量・底質調査等を用いて施設岸側の海浜安定性を検討したものである.ヘッドランドと人工リーフ周辺の波・流れの現地観測と …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_955-I_960, 2018

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