Post-fire debris-flow hazard model output files, Santa Fe Municipal Watershed

Wildfires are increasing in size and severity due to warmer drought climate change combined with overstocked forests. Fire increases the likelihood of debris flows, posing significant threats to life, property, and water supplies. Post-fire debris flows are a substantial, increasing hazard in the Santa Fe Municipal Watershed and other similar forested watersheds across the western United States. The Santa Fe Municipal Watershed in northern New Mexico is of vital importance to the water supply for the city of Santa We conducted a debris-flow hazard assessment for the Santa Fe Municipal Watershed (SFMW) in north-central New Mexico. We modeled post-fire debris flow probability and volume in 103 sub-basins for 2-year, 5-year, and Probable Maximum Precipitation rainfalls following modeled low-, moderate-, and high-severity wildfires. Crown fire potential was modeled with FlamMap (Finney, 2006), after Tillery et al. (2014). To satisfy data input requirements of the debris flow model that includes burn severity classes (low, moderate, and high), the modeled crown fire activity was first converted to dNBR (French et al. 2008). This conversion was calibrated based on burn severities from the 2011 Pacheco Fire that burned in a nearby watershed (approximately 5 km north of the SFMW). Data files are numbered 1-5. Spatial files provided in this data release include: 1) polygon of the study area; 2) 103 sub-basins within the study area; 3) Thematic Burn Severity Mosaic for New Mexico in 2011; and 4) complete post-fire debris flow probability and volume data of every rainfall event and wildfire scenario for 103 sub-basins; and tabulated data provided in this data release include: 5) calculated burn severity percentages for Pacheco Canyon Fire.

受气候变暖引发的干旱叠加森林过密化影响，野火的规模与烈度正持续攀升。野火会提升泥石流（debris flow）的发生概率，对生命、财产及供水系统构成严重威胁。火后泥石流（post-fire debris flow）已成为美国西部圣达菲市汇水区（Santa Fe Municipal Watershed, SFMW）及其他同类森林汇水区中日益严峻的重大灾害风险。
位于新墨西哥州北部的圣达菲市汇水区，对圣达菲市的供水保障具有至关重要的作用。本研究针对新墨西哥州中北部的圣达菲市汇水区开展了泥石流灾害评估工作。
我们针对研究区内的103个子流域，在模拟的轻度、中度、重度野火场景下，分别针对2年一遇、5年一遇及可能最大降水量（Probable Maximum Precipitation, PMP）降雨情境，构建了火后泥石流发生概率与体积预测模型。
依据Tillery等人（2014）的研究框架，我们使用FlamMap（Finney, 2006）模拟了冠层火潜在危险性。由于泥石流模型需输入火烧烈度等级（轻度、中度、重度）的相关数据，因此首先将模拟得到的冠层火活动数据转换为dNBR指数（French et al. 2008）。该转换过程基于2011年帕切科野火的火烧烈度数据进行校准，此次野火发生于圣达菲市汇水区以北约5公里的邻近汇水区内。
本数据集发布包含编号1至5的多个数据文件。其中，本次发布提供的空间数据包括：1）研究区多边形范围；2）研究区内的103个子流域；3）2011年新墨西哥州火烧烈度专题镶嵌图；4）覆盖103个子流域的所有降雨事件与野火场景下的完整火后泥石流发生概率与体积数据集；本次发布提供的表格数据包括：5）帕切科峡谷野火的火烧烈度百分比计算结果。