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Dive into the research topics where Keiji Nakai is active.

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Featured researches published by Keiji Nakai.


Journal of Japan Society of Civil Engineers | 2011

CHARACTERISTICS OF UNUSUAL SEA LEVEL OBSERVED ALONG SOUTHERN KANTO COASTS

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

Evaluation of Harbor Tranquility with Considering Effect of Double-peaked Offshore Spectrum

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

CHARACTERISTICS OF AMPLITUDES AND PERIODS OF SEICHES OBSERVED AROUND JAPAN

Kazunori Sameshima; Keiji Nakai; Ryoji Naito; Koji Kawaguchi; Kyoshi Nukada; Noriaki Hashimoto


Journal of Japan Society of Civil Engineers | 2017

THE IMPORTANCE OF SOUTHERNWESTERN WIND FOR STORM SURGES OBSERVED AT THE COASTS OF THE HOKURIKU DISTRICT

Keiji Nakai; Shoji Sasa; Shoji Iwasaki; Nobuyuki Takahashi; Yoshihiro Sato; Hirokazu Murase; Ryoichi Inoue


Journal of Japan Society of Civil Engineers | 2017

STUDY ON EXTREME WAVE AND WIND CONDITIONS OF OFFSHORE WIND TURBINES OFF THE KITA-KYUSYU CITY

Takeshi Yoshioka; Shinji Shimizu; Koji Kawaguchi; Toshihiko Nagai; Keiji Nakai


Journal of Japan Society of Civil Engineers | 2017

CHARACTERISTICS OF OBSERVED LOW FREQUENCY WAVE PROFILES OF THE 2016 FUKUSHIMA-OFF EARTHQUAKE AT OFFSHORE, SHALLOW SEA AND COASTAL STATIONS

Koji Kawaguchi; Satoshi Sakuraba; Toshihiko Nagai; Keiji Nakai; Kyoshi Nukada; Hirokazu Murase


Journal of Japan Society of Civil Engineers | 2017

INVESTIGATION OF CHARACTERISTICS OF CURRENT UNDER HIGH WAVES IN THE OFFSHORE KITA-KYUSHU

Takeshi Yoshioka; Shinji Shimizu; Koji Kawaguchi; Nobuyuki Ono; Keiji Nakai; Toshihiko Nagai


Journal of Japan Society of Civil Engineers | 2017

DETAILED STUDY ON CHARACTERISTICS OF SEICHES OBSERVED AROUND JAPAN

Keiji Nakai; Noriaki Hashimoto; Kyoshi Nukada


Journal of Japan Society of Civil Engineers | 2016

STUDY ON ACCESSIBILITY AND DESIGN CONDITIONS OF OFFSHORE WIND TURBINES AROUND JAPANESE COASTAL AREA

Takeshi Yoshioka; Noboru Sakamoto; Koji Kawaguchi; Toshihiko Nagai; Keiji Nakai


Journal of Japan Society of Civil Engineers | 2016

CHARACTERISTICS OF SEICHES AROUND JAPAN

Keiji Nakai; Noriaki Hashimoto; Kyoshi Nukada

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Ryoji Naito

Tokyo Institute of Technology

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