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面对海平面上升后沿海区域大范围淹没模拟的应用需求,提出了一种基于球面QTM的大范围有源淹没算法,首先构建了研究区域的QTM三角格网集,并利用海陆分离的思想确定了初始淹没单元;然后基于QTM的12邻近搜索设计了面向多目标三角格网的淹没范围扩张方法,将初始淹没单元递归扩张得到最终的淹没范围;最后应用Visual C#语言及Microsoft Direct X三维图形接口设计开发了相应的试验原型系统,并利用天地图高分辨率影像和SRTM地形数据对试验区域进行了海平面上升后的大范围淹没模拟试验。结果表明,该算法具有较好的实用性,可以有效地对海平面上升后的大区域范围进行动态地淹没模拟,对辅助防灾减灾具有一定意义。
In the face of the application demand of large-scale submerged simulation in the coastal area after sea level rise, a large-scale active submerged algorithm based on spherical QTM is proposed. Firstly, the QTM triangular grid set of the research area is constructed, and the idea of sea-land separation The initial submerged units were constructed. Then, a 12-neighbor search based on QTM was designed to expand the submerged range of multi-objective triangular grids. The initial submerged units were recursively expanded to obtain the final submergence range. Finally, Visual C # language and Microsoft Direct X 3D graphics interface The corresponding experimental prototype system was designed and developed, and a large-scale submerged simulation experiment after the sea level rise was carried out in the test area by utilizing the high resolution aerial imagery and SRTM topographic data. The results show that the proposed algorithm has good practicability and can effectively simulate the flooding of a large area after the sea level rise. It is of great significance to assist disaster prevention and mitigation.