U-075 - Holy Fire Headwater Sediment Dynamics, Santa Ana Mts, CA
PI: Dr. Andrew Gray, Dr. Nicolas Barth
Project Lead: James Guilinger
Funding Source: None
Location: Leach Canyon, Santa Ana Mountains, CA
Dates: 2018-10-25 to 2019-04-27
Project Summary
Post-fire debris flows are particularly complex to study because they do not form discrete initiation locations and commonly involve multiple simultaneously operating erosional processes. Although recent work has begun to elucidate a more mechanistic understanding of post-fire debris flows, there is still a paucity of detailed sediment budgets characterizing these events. In this study, we seek to understand how post-fire sediment sources and erosional processes change over multiple storm cycles. To do this, we performed repeat high-resolution change detection in a headwater catchment burned by the 2018 Holy Fire in the Santa Ana Mountains, California, USA. This included terrestrial laser scanning in a zero- order catchment (0.95 ha) and unmanned aerial vehicle structure-from-motion of a headwater channel network (up to 6.5 ha).