基于大坝施工的水下地形可视域拓扑特征与数字孪生模型

Visualizable Topological Features and Digital Twin Model of Underwater Terrain in Dam Construction

为实现更加顺利、安全的大坝施工,考虑在施工中应用可视化技术,设计一种基于大坝施工的水下地形海量数据数字孪生空间映射模型,实现三维地形的可视化.通过单波束测深仪测量大坝水下地形,完成大坝水下地形海量数据的采集.应用基于空间异性的数据三维插值建模方法对采集数据实施插值处理.考虑拓扑关系,构建大坝水下地形可视域拓扑特征表示模型,给出大坝水下地形可视域的分布描述.依据构建的DEM模型与水下地形可视域的分布描述,构建纹理空间与景物空间之间的映射关系和三维地形图与景物空间之间的映射关系,根据映射关系搭建数字孪生空间映射模型.测试结果表明,该模型的形变程度低于3%,初始加载仅花费了7910ms,细节加载中仅花费了1500ms左右,整体加载时间较短.

To facilitate smoother and safer dam construction,a visualization technique in the construction process is proposed.The digital twin space mapping model,designed for visualizing massive underwater terrain data in dam construction,enables three-dimensional terrain visualization.The underwater terrain of the dam is measured using a single-beam bathymeter,completing a massive data collection of the terrain.A three-dimensional interpolation modeling method,based on spatial anisotropy,is applied to interpolate the collected data.Considering topological relationships,a viewable topological feature representation model is constructed for the underwater terrain of the dam.This model provides a distribution description of the viewable domain.The mapping relationships between texture space and scenery space,as well as between the 3D terrain map and scenery space,are established based on the constructed DEM model and the underwater terrain visibility distribution description.Utilizing these mapping relationships,a digital twin space mapping model is developed.Test results indicate that the deformation degree of the model is less than 3%,with initial loading taking 7910 ms and detailed loading approximately 1500 ms,demonstrating a relatively short overall loading time.