Complex internal architecture of a debris-flow deposit revealed using ground-penetrating radar, Cass, New Zealand

摘要

Previous research on debris-flow deposit structure typically reports little to no visually discernible stratigraphy. The preliminary findings presented here provide evidence for more complex internal deposit architecture with inverse grading and subunits thought to reflect individual flow surges. Ground-penetrating radar surveys, geospatial data and field observations are used to describe 10 subunits traceable over the 14 lateral radargrams imaging the lower 38m of the deposit. Additional subunits are depicted further upslope in a longitudinal transect. As well as demonstrating the need for continued investigation of deposit architecture using non-traditional techniques, these results may help improve future interpretations of post-event deposits.