Debris flow mitigation - adapting to climate change and wildfires

在加拿大西部，气候变化正在导致炎热和干燥的天气以及降水强度较高的时期。这些条件共同造成了更大和更严重的野火，随后是更具破坏性和更广泛分布的野火后的泥石流和洪水。燃烧的分水岭增加了降雨或融雪产生的地表径流。过量的径流产生了泥石流和泥石流，淹没了河道，损坏了谷底附近冲积扇上的财产和基础设施。迫切需要开展研究，以制定野火后泥石流/洪水的缓解措施，努力建立对气候极端事件引发的未来事件的复原力。拟议的研究旨在确定风险最高的地点，并建议具有成本效益的减轻地质灾害的方法，以保护人和财产，特别是农村和原住民社区的人和财产。实现这些目标的必要任务包括开发更好的泥石流/洪水模拟模型，利用对最近泥石流现场的仔细记录来校准这些模型，开发新技术以创建空间准确的危险地图，以及制定易于理解的地质灾害保护公共准则。

In western Canada, climate change is causing hotter and dry weather as well as periods of higher intensity precipitation. These conditions conspire to create larger and more severe wildfires followed by more destructive and widely distributed post-wildfire debris flows and floods. A burnt watershed increases surface runoff from rain or snowmelt. The excessive runoff generates debris flows and debris floods that overwhelm stream channels and damage property and infrastructure on alluvial fans near the valley bottoms. There is an urgent need to conduct research to develop mitigation measures for post-wildfire debris flows/floods in an effort to build resiliency to future events triggered by climate extremes.The proposed research aims to identify sites at the highest risk and recommend cost-effective geohazard mitigation methods to protect people and properties, especially those in rural and First Nations communities. Necessary tasks to achieve these objectives include developing better debris flow/flood simulation models, calibrating these models using careful documentation of recent debris flow sites, developing new techniques to create spatially accurate hazard maps, and creating easy-to-understand public guidelines for geohazard protection.