用物理模型与数据结合,精准预测城市边缘火灾蔓延路径。
GraphFire-X: Physics-Informed Graph Attention Networks and Structural Gradient Boosting for Building-Scale Wildfire Preparedness at the Wildland-Urban Interface
- 构建双专家框架,分别分析环境传播与建筑脆弱性。
- 实测2025年Eaton火灾,发现邻里环境压力主导火势扩散。
- 识别屋檐为关键入侵点,助力精准制定防火策略。
随着野火不断演变为城市大火,传统将建筑视为孤立资产的风险模型无法捕捉野地-城市交界处(WUI)特有的非线性蔓延特性。本文提出一种新型双专家集成框架,将风险分解为环境传播和结构脆弱性两个独立维度。环境专家采用图神经网络(GNN),将社区建模为有向传播图,权重基于物理驱动的对流、辐射与飞火概率,并融合高维谷歌AlphaEarth Foundation嵌入;结构专家则使用XGBoost,聚焦单体建筑级抗灾能力。应用于2025年Eaton火灾案例,结果显示:邻里尺度的环境压力远超建筑固有属性,主导火势传播路径;而XGBoost识别出屋檐是主要微尺度侵入路径。通过逻辑堆叠整合两类信号,该框架实现稳健分类并生成诊断性风险拓扑,使决策者可突破二元损失预测,优先开展高连通性区域植被管理与易损节点结构加固,推动以数据驱动的主动韧性建设。
原文摘要 · Abstract (English)
As wildfires increasingly evolve into urban conflagrations, traditional risk models that treat structures as isolated assets fail to capture the non-linear contagion dynamics characteristic of the wildland urban interface (WUI). This research bridges the gap between mechanistic physics and data driven learning by establishing a novel dual specialist ensemble framework that disentangles vulnerability into two distinct vectors, environmental contagion and structural fragility. The architecture integrates two specialized predictive streams, an environmental specialist, implemented as a graph neural network (GNN) that operationalizes the community as a directed contagion graph weighted by physics informed convection, radiation, and ember probabilities, and enriched with high dimensional Google AlphaEarth Foundation embeddings, and a Structural Specialist, implemented via XGBoost to isolate granular asset level resilience. Applied to the 2025 Eaton Fire, the framework reveals a critical dichotomy in risk drivers. The GNN demonstrates that neighborhood scale environmental pressure overwhelmingly dominates intrinsic structural features in defining propagation pathways, while the XGBoost model identifies eaves as the primary micro scale ingress vector. By synthesizing these divergent signals through logistic stacking, the ensemble achieves robust classification and generates a diagnostic risk topology. This capability empowers decision makers to move beyond binary loss prediction and precisely target mitigation prioritizing vegetation management for high connectivity clusters and structural hardening for architecturally vulnerable nodes thereby operationalizing a proactive, data driven approach to community resilience.
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