| 渤海沿岸固定冰粗糙特征的实测研究 |
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| 作者姓名： | LIU Chengyu CHAO Jinlong GU Wei LI Lantao XU Yingjun |
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| 作者单位： | State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Academy of Ministry of Civil Affairs and Ministry of Education for Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Academy of Ministry of Civil Affairs and Ministry of Education for Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China |
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| 基金项目： | The National High Technology Research and Development Program of China under contract No. 2011AA100505 ;the National Key Technology R&D Program of China under contract No. 2006BAB03A03;the State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University of China under contract Nos 2010-TD-02 and 2011-TDZD-050. |
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| 摘 要： | The surface roughness characteristics(e.g., height and slope) of sea ice are critical for determining the parameters of an electromagnetic scattering, a surface emission and a surface drag coefficients. It is also important in identifying various ice types, retrieval ice thickness, surface temperature and drag coefficients from remote sensing data. The point clouds(a set of points which are usually defined by X, Y, and Z coordinates that represents the external surface of an object on earth) of land fast ice in five in situ sites in the eastern coast Bohai Sea were measured using a laser scanner-Trimble GX during 2011–2012 winter season. Two hundred and fifty profiles selected from the point clouds of different samples have been used to calculate the height root mean square, height skewness, height kurtosis, slope root mean square, slope skewness and slope kurtosis of them. The root mean square of the height, the root mean square of the slope and the correlation length are about 0.090, 0.075 and 11.74 m, respectively. The heights of 150 profiles in three sites manifest the Gaussian distribution and the slopes of total 250 profiles distributed exponentially. In addition, the fractal dimension and power spectral density profiles were calculated. The results show that the fractal dimension of land fast ice in the Bohai Sea is about 1.132. The power spectral densities of 250 profiles can be expressed through an exponential autocorrelation function.
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| 关 键 词： | 表面粗糙度 环渤海 海冰 特性 功率谱密度 陆地 阻力系数 分形维数 |
| 收稿时间： | 2012/7/16 0:00:00 |
| 修稿时间： | 2014/2/19 0:00:00 |
On the surface roughness characteristics of the land fast sea-ice in the Bohai Sea |
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| LIU Chengyu,CHAO Jinlong,GU Wei,LI Lantao,XU Yingjun.On the surface roughness characteristics of the land fast sea-ice in the Bohai Sea[J].Acta Oceanologica Sinica,2014,33(7):97-106. |
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| Authors: | LIU Chengyu CHAO Jinlong GU Wei LI Lantao and XU Yingjun |
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| Affiliation: | State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Academy of Ministry of Civil Affairs and Ministry of Education for Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;Academy of Ministry of Civil Affairs and Ministry of Education for Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China |
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| Abstract: | The surface roughness characteristics (e.g., height and slope) of sea ice are critical for determining the parameters of an electromagnetic scattering, a surface emission and a surface drag coefficients. It is also important in identifying various ice types, retrieval ice thickness, surface temperature and drag coefficients from remote sensing data. The point clouds (a set of points which are usually defined by X, Y, and Z coordinates that represents the external surface of an object on earth) of land fast ice in five in situ sites in the eastern coast Bohai Sea were measured using a laser scanner-Trimble GX during 2011-2012 winter season. Two hundred and fifty profiles selected from the point clouds of different samples have been used to calculate the height root mean square, height skewness, height kurtosis, slope root mean square, slope skewness and slope kurtosis of them. The root mean square of the height, the root mean square of the slope and the correlation length are about 0.090, 0.075 and 11.74 m, respectively. The heights of 150 profiles in three sites manifest the Gaussian distribution and the slopes of total 250 profiles distributed exponentially. In addition, the fractal dimension and power spectral density profiles were calculated. The results show that the fractal dimension of land fast ice in the Bohai Sea is about 1.132. The power spectral densities of 250 profiles can be expressed through an exponential autocorrelation function. |
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| Keywords: | sea ice roughness statistical parameters fractal dimension spectral density |
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