基于地形坝体一体化三维场景的水库洪水淹没模拟  

Reservoir Flood Inundation Simulation Based on Integrated 3D Scene of Terrain and Dam

作　　者：陈文君[1] 陈锁忠[1] 杨军[2] 马俊霆 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210046 [2]江苏省防汛防旱指挥部办公室,江苏南京210046

出　　处：《地理与地理信息科学》2014年第2期16-19,25,F0002,共6页Geography and Geo-Information Science

基　　金：国家高新技术研究发展计划(863计划)资助项目(2009AA12Z223)

摘　　要：提出一种无缝融合地形三角网与坝体虚拟现实模型、构建一体化水库库区三维场景的方法。基于真实连续的下垫面环境进行确定水位的淹没模拟,其中地形部分以迭代实现邻接扩展的淹没算法,坝体部分通过高程比较与体元轴对齐包围盒相交判断确定迎水面受淹形态。通过计算广义三棱柱及其变体的离散水体体积,求得水位对应库容,并构建二分查找判定树,以快速获取接受净入库洪量后的库区洪水淹没结果,并在三维场景中渲染表达。实验结果表明,基于地形坝体一体化三维场景的计算模拟方法,相比传统库容曲线与洪水风险图能够在展现库区洪灾影响范围的同时,兼顾坝体局部的淹没细节。A method was proposed to build an integrated 3D scene in the reservoir area,which seamlessly merged the terrain triangulation meshes and the virtual reality model of darn.Given by a determined water level,the inundation simulation is based on the real and continuous underlying surface.Terrain inundation is implemented by iterative adjacent expansion algorithm,while the inundated shape on the water side of dam is delimited by elevation comparison and intersection judgment on axis-aligned bounding boxes of discrete voxels.The generalized triangular prisms and their variants are the discrete expression of water in the reservoir area.Their volume calculation could obtain the corresponding storage capacity.Based on a binary search decision tree,there is a quick access to reservoir flood inundation results after the acceptance of net inflow flood,which render in the integrated 3D scene.The result shows that,compared with traditional storage capacity curve and flood risk maps,this reservoir flood inundation method could give the integral flood affected area for the reservoir,as well as the local flood details on the dam.

关 键 词：水库洪水淹没 三维场景 地形三角网 坝体模型 

分 类 号：P333[天文地球—水文科学]