水面三维可视化是实现数字流域逼真展示的重要技术手段,现有水面三维可视化技术普遍未考虑天然河道水面比降的特性,难以适用于大尺度、流域级的河道水位过程三维可视化。提出了一种顾及水面比降的河道水面三维可视化方法,首先对河道水面边界多边形进行边界点增密与多边形三角化,然后基于河道水位过程数据对多边形边界点的高程进行插值与调整,最后基于调整后的三角网进行水面绘制。试验以三峡库区水位过程数据为基础进行了河道水面三维可视化,结果表明该方法能够有效表达天然河道的水位渐变过程。

Three-dimensional visualization of water surface is an important technical means to achieve realistic display of digital watershed. The existing three-dimensional visualization technology of water surface generally does not consider the characteristics of water surface ratio of natural river course, and it is difficult to apply to three-dimensional visualization of water surface at large scale and basin level. A three-dimensional visualization method of river surface water surface considering water surface ratio is proposed. Firstly, boundary point densification and polygon triangulation were performed on the river surface boundary polygon, and then the elevation of the polygon boundary point was interpolated and adjusted based on the river water level process data. The adjusted triangle mesh was used for water surface drawing. Based on the water level process data of the Three Gorges reservoir area, the three-dimensional visualization of the river surface was carried out. The results show that the method can effectively express the water level grading process of natural rivers.