The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Satoru Komori - One of the best experts on this subject based on the ideXlab platform.
-
mechanism of drag coefficient saturation at strong wind speeds
Geophysical Research Letters, 2016Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi KuroseAbstract:Previous studies [Powell et al., 2003; Donelan et al., 2004; Takagaki et al., 2012] have demonstrated the saturation of drag coefficients at strong wind speeds. But, the mechanism behind this saturation has not yet been fully clarified. In this study, at normal and strong wind speeds, we use a wind wave tank for investigating the peak enhancement factor of the wind-Sea Spectrum, which is an appropriate wave parameter for representing interfacial flatness. We measured the water-level fluctuation using wave gauges. At strong wind speeds, the result shows that the peak enhancement factor of the wind-Sea Spectrum decreases with decreasing inverse wave age and with increasing wind speed. This suggests that the distinctive wind-wave breaking occurs at strong wind speeds. It also suggests that this distinctive breaking of wind waves causes the saturation of drag coefficients at strong wind speeds.
-
strong correlation between the drag coefficient and the shape of the wind Sea Spectrum over a broad range of wind speeds
Geophysical Research Letters, 2012Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi Kurose, Takenori Kuramoto, Satoshi Shimada, Keiko TakahashiAbstract:[1] Momentum transfer across the wind-driven breaking air-water interface under strong wind conditions was experimentally investigated using a high-speed wind-wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the Sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given againstU10only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.
Ryoichi Kurose - One of the best experts on this subject based on the ideXlab platform.
-
mechanism of drag coefficient saturation at strong wind speeds
Geophysical Research Letters, 2016Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi KuroseAbstract:Previous studies [Powell et al., 2003; Donelan et al., 2004; Takagaki et al., 2012] have demonstrated the saturation of drag coefficients at strong wind speeds. But, the mechanism behind this saturation has not yet been fully clarified. In this study, at normal and strong wind speeds, we use a wind wave tank for investigating the peak enhancement factor of the wind-Sea Spectrum, which is an appropriate wave parameter for representing interfacial flatness. We measured the water-level fluctuation using wave gauges. At strong wind speeds, the result shows that the peak enhancement factor of the wind-Sea Spectrum decreases with decreasing inverse wave age and with increasing wind speed. This suggests that the distinctive wind-wave breaking occurs at strong wind speeds. It also suggests that this distinctive breaking of wind waves causes the saturation of drag coefficients at strong wind speeds.
-
strong correlation between the drag coefficient and the shape of the wind Sea Spectrum over a broad range of wind speeds
Geophysical Research Letters, 2012Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi Kurose, Takenori Kuramoto, Satoshi Shimada, Keiko TakahashiAbstract:[1] Momentum transfer across the wind-driven breaking air-water interface under strong wind conditions was experimentally investigated using a high-speed wind-wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the Sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given againstU10only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.
Naohisa Takagaki - One of the best experts on this subject based on the ideXlab platform.
-
mechanism of drag coefficient saturation at strong wind speeds
Geophysical Research Letters, 2016Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi KuroseAbstract:Previous studies [Powell et al., 2003; Donelan et al., 2004; Takagaki et al., 2012] have demonstrated the saturation of drag coefficients at strong wind speeds. But, the mechanism behind this saturation has not yet been fully clarified. In this study, at normal and strong wind speeds, we use a wind wave tank for investigating the peak enhancement factor of the wind-Sea Spectrum, which is an appropriate wave parameter for representing interfacial flatness. We measured the water-level fluctuation using wave gauges. At strong wind speeds, the result shows that the peak enhancement factor of the wind-Sea Spectrum decreases with decreasing inverse wave age and with increasing wind speed. This suggests that the distinctive wind-wave breaking occurs at strong wind speeds. It also suggests that this distinctive breaking of wind waves causes the saturation of drag coefficients at strong wind speeds.
-
strong correlation between the drag coefficient and the shape of the wind Sea Spectrum over a broad range of wind speeds
Geophysical Research Letters, 2012Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi Kurose, Takenori Kuramoto, Satoshi Shimada, Keiko TakahashiAbstract:[1] Momentum transfer across the wind-driven breaking air-water interface under strong wind conditions was experimentally investigated using a high-speed wind-wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the Sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given againstU10only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.
Koji Iwano - One of the best experts on this subject based on the ideXlab platform.
-
mechanism of drag coefficient saturation at strong wind speeds
Geophysical Research Letters, 2016Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi KuroseAbstract:Previous studies [Powell et al., 2003; Donelan et al., 2004; Takagaki et al., 2012] have demonstrated the saturation of drag coefficients at strong wind speeds. But, the mechanism behind this saturation has not yet been fully clarified. In this study, at normal and strong wind speeds, we use a wind wave tank for investigating the peak enhancement factor of the wind-Sea Spectrum, which is an appropriate wave parameter for representing interfacial flatness. We measured the water-level fluctuation using wave gauges. At strong wind speeds, the result shows that the peak enhancement factor of the wind-Sea Spectrum decreases with decreasing inverse wave age and with increasing wind speed. This suggests that the distinctive wind-wave breaking occurs at strong wind speeds. It also suggests that this distinctive breaking of wind waves causes the saturation of drag coefficients at strong wind speeds.
-
strong correlation between the drag coefficient and the shape of the wind Sea Spectrum over a broad range of wind speeds
Geophysical Research Letters, 2012Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi Kurose, Takenori Kuramoto, Satoshi Shimada, Keiko TakahashiAbstract:[1] Momentum transfer across the wind-driven breaking air-water interface under strong wind conditions was experimentally investigated using a high-speed wind-wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the Sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given againstU10only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.
Naoya Suzuki - One of the best experts on this subject based on the ideXlab platform.
-
mechanism of drag coefficient saturation at strong wind speeds
Geophysical Research Letters, 2016Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi KuroseAbstract:Previous studies [Powell et al., 2003; Donelan et al., 2004; Takagaki et al., 2012] have demonstrated the saturation of drag coefficients at strong wind speeds. But, the mechanism behind this saturation has not yet been fully clarified. In this study, at normal and strong wind speeds, we use a wind wave tank for investigating the peak enhancement factor of the wind-Sea Spectrum, which is an appropriate wave parameter for representing interfacial flatness. We measured the water-level fluctuation using wave gauges. At strong wind speeds, the result shows that the peak enhancement factor of the wind-Sea Spectrum decreases with decreasing inverse wave age and with increasing wind speed. This suggests that the distinctive wind-wave breaking occurs at strong wind speeds. It also suggests that this distinctive breaking of wind waves causes the saturation of drag coefficients at strong wind speeds.
-
strong correlation between the drag coefficient and the shape of the wind Sea Spectrum over a broad range of wind speeds
Geophysical Research Letters, 2012Co-Authors: Naohisa Takagaki, Satoru Komori, Naoya Suzuki, Koji Iwano, Ryoichi Kurose, Takenori Kuramoto, Satoshi Shimada, Keiko TakahashiAbstract:[1] Momentum transfer across the wind-driven breaking air-water interface under strong wind conditions was experimentally investigated using a high-speed wind-wave tank together with field measurements at normal wind speeds. An eddy correlation method was utilized to measure roughness length and drag coefficient from wind velocity components measured by laser Doppler and phase Doppler anemometers. As a result, a new model for the roughness length and drag coefficient was proposed for predicting momentum transfer across the Sea surface under both normal and strong wind conditions using the universal relationship between energy and significant frequency of wind waves normalized by the roughness length. The model shows that the roughness length and drag coefficient are uniquely determined at all wind speeds by energy and significant frequency of wind waves, and they can be given againstU10only from the measurements of the wave parameters and one-point mean air velocity in the logarithmic law region.