| 摘要: |
| 对海洋上空卫星测得的近红外波段辐射所反映的信息进行理论分析，表明卫星近红外波段图像上反映的是海况信息。1986年11月5日陆地卫星TM6图像显示胶州湾海表温度的波状分布，TM2，TM3，TM4波段彩色合成图显示胶州湾的悬浮泥沙含量分布和泥沙运动。TM4图像显示在海洋波动和风力作用下的海况，并用实测潮汐资料、气象信息解译胶州湾海况。在胶州湾中、西部，悬浮泥沙含量较高，而TM4波段辐射值较低，图像阴暗，较高的泥沙含量并没有提高TM4波段的辐射值。胶州湾东部，悬浮泥沙含量较低，而TM4波段辐射值较高，图像明亮。TM4波段辐射值并不反映泥沙含量和海底深度，它们仅提供海洋表面粗糙度或海况信息。 |
| 关键词: 近红外图像 海况 胶州湾 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，4860273号 |
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| SURVEY OF SEA STATE IN JIAOZHOU BAY USING NEAR INFRARED IMAGE OF LANDSAT-5 |
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Ping Zhongliang
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Environmental Science Department, Qingdao University, Qingdao 266071
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| Abstract: |
| In theory, the near infrared image obtained at satellite orbit altitude above sea represents sea state. The TM6 image is made to show the wavelike features of the sea surface temperature in Jiaozhou Bay acted upon by the sea wave (Seiche) in November 5, 1986. The color composite image of the TM2, TM3, TM4 band displays the suspended sediment distribution and sediment movement. The TM4 image describes the sea state in Jiaozhou Bay acted upon by the sea wave and the wind.
In Jiaozhou Bay's central and western parts, the suspended sediment contents are higher but the radiance values in the TM4 band are lower, the image appears‘ dark. The high sediment contents do not increase the radiance values in the TM4 band. In the eastern part of Jiaozhou Bay, the suspended sediment contents are lower, but the radiance values in the TM4 band are higher, the image appears bright. So the radiance values in the TM4 band do not represent the sediment contents and depths. They give only information on the sea surface roughness or sea state.
The cloud of smoke from the Qingdao electric power plant moving 7-8km in NNE direction can be seen in the color composite image. It is obvious that the wind was strong, about 5 - 6 grade.
In Jiaozhou Bay’s eastern part, the wind was in the same direction as that of the wave movement. The wind blew on the sea surface over a long distance. The sea surface was rough. In the central and western part of Jiaozhou Bay, the wind direction differed from that of the wave movement when the wind blew on the sea surface for a shorter distance, the sea surface was smoother.
The research led to the following conclusions: TM4 image gave information on sea surface roughness or sea state. It is possible to study the sea state using near infrared image. |
| Key words: Near infrared image, Sea state, Jiaozhou Bay |
