灾后景区建设场址安全性分析

为了指导灾后区域环境的安全监测和生态修复工程,运用数字高程模型定量分析方法,构建了分析高坡度地带和汇流流径区域地质灾害的三维虚拟模型.选取景观研究尺度为5 000单元粒度,用该模型模拟分析不同时间段深溪沟地质灾害区域的场址环境,研究结果表明:引发灾害的关联影响因子包括坡度因子和汇流累积量分布因子,坡度大于50且变化较大的带状区域生态环境较脆弱,易发生泥石流等地质灾害;将汇流累积出水口图与泥石流灾害图叠置后分析表明,众多地质灾害点均位于汇流出水口区域或流径上;应加强对灾后陡坡敏感带的安全监测管理和生态修复.最后,提出了地质灾害区域的固土植被带建设规划和土地调整利用的景观生态安全格局规划. 

Post-Disaster Safety Analysis of Construction Site of Scenic Region

A 3D virtual model for high gradient zones and flow path regions was built by quantitative analysis methods of the digital elevation model, to guide the safety monitoring and ecological restoration of a regional environment after disaster. Using the virtual model, the site environment in the geological disaster region of Shenxigou was analyzed with a landscape scale of 5 000 unitary granularity. The result shows that the relevant influencing factors that can trigger disasters include slope and confluence cumulant, and regions with a slope of greater than 50 and a large ecological environment change are susceptible to mud-rock flow and other geological disasters. Combination of the cumulant outlet diagram with the hazard maps for mud-rock flow shows that many sites of geological hazards are in the water outlet area or along the flow path. Therefore, the security monitoring and ecological restoration of sensitive slope areas should be strengthened after disasters. In addition, the soil reinforcement and vegetation planning for geological disaster regions and the land utilization adjustment planning for landscape ecological security were proposed.