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Publication
Featured researches published by Keiji Nakai.
Journal of Japan Society of Civil Engineers | 2011
Kojiro Suzuki; Hiroyasu Kawai; Keiji Nakai
銚子漁港 気象庁 銚子 1997~2008年 勝浦 国土地理院 勝浦 1997~2008年 布良 気象庁 館山 1997~2008年 千葉 海洋情報部 千葉 1997~2008年 東京 気象庁 東京 1997~2008年 横浜新港 海洋情報部 横浜 1997~2008年 横須賀 海洋情報部 横浜 1997~2008年 久里浜 港空研 横浜 1997~2008年 油壺 国土地理院 横浜 1997~2008年 真鶴 国土地理院 網代 1999~2008年 初島 国土地理院 網代 1999~2008年 伊東 国土地理院 網代 1997~2008年 岡田 気象庁 大島 1997~2008年 田子 国土地理院 石廊崎 1997~2008年 内浦 気象庁 三島 1997~2008年 南関東沿岸における異常潮位の出現特性 CHARACTERISTICS OF UNUSUAL SEA LEVEL OBSERVED ALONG SOUTHERN KANTO COASTS
Journal of Japan Society of Civil Engineers | 2009
Katsuya Hirayama; Hiroaki Kashima; Keiji Nakai; Masanobu Kudaka
Generally, a joint distribution of significant wave height, period and direction outside a harbor is analyzed with assumption that a single-peaked spectrum is observed in each time. However, the significant wave periods should be underestimated when double-peaked spectra are observed, and that seems to affect wave height exceedance within the harbor. In this paper, the occurrence frequency of the double-peaked spectrum is estimated by using newly proposed method. Moreover, the estimation of the probability of wave height exceedance within the harbor is carried out with considering both the separated significant periods of wind wave and swell from the double-peaked spectrum. On a berth in the target harbor, it reduces 0.1% when the number of underestimation of significant wave periods is 2% in whole observed spectra.
Journal of Japan Society of Civil Engineers | 2018
Kazunori Sameshima; Keiji Nakai; Ryoji Naito; Koji Kawaguchi; Kyoshi Nukada; Noriaki Hashimoto
Journal of Japan Society of Civil Engineers | 2017
Keiji Nakai; Shoji Sasa; Shoji Iwasaki; Nobuyuki Takahashi; Yoshihiro Sato; Hirokazu Murase; Ryoichi Inoue
Journal of Japan Society of Civil Engineers | 2017
Takeshi Yoshioka; Shinji Shimizu; Koji Kawaguchi; Toshihiko Nagai; Keiji Nakai
Journal of Japan Society of Civil Engineers | 2017
Koji Kawaguchi; Satoshi Sakuraba; Toshihiko Nagai; Keiji Nakai; Kyoshi Nukada; Hirokazu Murase
Journal of Japan Society of Civil Engineers | 2017
Takeshi Yoshioka; Shinji Shimizu; Koji Kawaguchi; Nobuyuki Ono; Keiji Nakai; Toshihiko Nagai
Journal of Japan Society of Civil Engineers | 2017
Keiji Nakai; Noriaki Hashimoto; Kyoshi Nukada
Journal of Japan Society of Civil Engineers | 2016
Takeshi Yoshioka; Noboru Sakamoto; Koji Kawaguchi; Toshihiko Nagai; Keiji Nakai
Journal of Japan Society of Civil Engineers | 2016
Keiji Nakai; Noriaki Hashimoto; Kyoshi Nukada