NSW post-fire debris flow susceptibility map

Debris flows are extremely damaging and dangerous post-fire hazards that can cause significant short- and long-term impacts to rivers and aquatic ecosystems, water quality, and infrastructure. However, they are relatively poorly documented in NSW. High-resolution aerial imagery highlights significant debris flow activity in parts of NSW severely impacted by the 2019/20 Black Summer bushfires, specifically the Tuross, Tumut and Lake Burragorang catchments which were mapped in detail. This inventory of debris flow occurrences was used to train and validate a predictive logistic regression model using key predictor variables slope, fire severity, aridity, geology and soil erodibility. The model outputs can inform assessments of future potential hazards to threatened aquatic species, remote infrastructure such as roads and properties, and drinking water reservoirs and associated infrastructure. \r\n\r\nFor more information, please read the accompanying report, ‘Post-fire debris flows in NSW: Susceptibility modelling and implications for management’, or check out this link: https://www.environment.nsw.gov.au/topics/water/estuaries/estuaries-research/bushfire-affected-waterways碎屑流（debris flows）是极具破坏性与危险性的火后灾害类型，可对河流与水生生态系统、水质及基础设施造成显著的短期与长期负面影响。然而，新南威尔士州（New South Wales, NSW）针对此类灾害的记录相对匮乏。高分辨率航空影像显示，在2019/20年黑色夏季丛林大火（2019/20 Black Summer bushfires）严重波及的新南威尔士州部分区域，尤其是经详细测绘的图罗斯（Tuross）、图穆特（Tumut）与巴拉戈朗湖（Lake Burragorang）流域，碎屑流活动十分活跃。本碎屑流发生情况编目被用于训练并验证一款预测逻辑回归模型，所用核心预测变量包括坡度、火灾烈度、干旱度、地质条件与土壤可蚀性。该模型的输出结果可为未来潜在灾害风险评估提供支撑，评估对象涵盖受威胁水生物种、道路与地产等偏远基础设施，以及饮用水水库及其相关配套设施。 如需了解更多信息，请查阅随附报告《新南威尔士州火后碎屑流：敏感性建模与管理启示》，或访问以下链接：https://www.environment.nsw.gov.au/topics/water/estuaries/estuaries-research/bushfire-affected-waterways