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位置：首页 >> 期刊文章
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摘要：
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基于RS和G IS技术对一期工程治理前后的长江口深水航道进行可视化研究,从空间三维角度反映了深水航道特征。采用RS技术对ETM+影像进行高通滤波增强处理;采用G IS技术将一期工程治理前后地形图资料数字化,并建立数字地形模型,从横剖面、纵剖面、空间平面等不同角度研究航道的特点。结果表明:经过增强处理的遥感影像上能清晰辨认导堤、丁坝和周围出露水面的沙体,揭示出它们的空间边缘特征;航道中段水深明显增深;航道向导堤方向水深线变密集,水底地形坡度变大,近似“U”字形“河道”;航道底部较平坦,纵向深度逐渐变化,最深处为-12.2 m左右,最浅处也在-8.5 m以下。
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Based on the RS and GIS technology,research was made on the visualization of the deepwater channel in the Changjiang Estuary before and after the first phase of the regulation works was implemented,reflecting the 3D spatial features of the deepwater channel.The ETM+ images were enhanced with high pass filtering by way of RS technology.The relief maps of the deepwater before and after the regulation project had been implemented were digitalized with the GIS technology to establish DEMs for study and reseaarch on the features of the channels from the aspects of transverse profile,longitudinal profile and spatial plane.The results of the research show that levees,groins and exposed sand bars around the levees and groins are clearly recognizable in the enhanced ETM+ images,revealing their spatial verges.The middle section of the channel goes remarkably deeper.The water contours become denser at the section of the channel going towards the levees.With the gradient of the underwater terrain becoming great,it appears to become a U-shaped "river bed".The bottom of the channel is quite flat and the water depth changes gradually and longitudinally along the channel,showing that the deepest bed lies at about-12.2 m and the highest bed lies below-8.5 m.
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基金项目：
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国家自然科学基金重点项目(50339010);;
“十五”“211工程”建设资助项目
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作者简介：
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参考文献：
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