Characterizing the primary material sources and dominant erosional processes for post-fire debris-flow initiation in a headwater basin using multi-temporal terrestrial laser scanning data

Geomorphology ◽  
2014 ◽  
Vol 214 ◽  
pp. 324-338 ◽  
Author(s):  
Dennis M. Staley ◽  
Thad A. Wasklewicz ◽  
Jason W. Kean
Keyword(s):  
Debris Flow ◽  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Primary Material ◽  
Material Sources ◽  
Fire Debris ◽  
Multi Temporal ◽  
Debris Flow Initiation

A 4-D reconstruction of post debris-flow sediment dynamic inferred from multi-temporal terrestrial laser scanning and photogrammetry (Roßbichelgraben, Germany)

2020 ◽  
Author(s):  
Andreas Dietrich ◽  
Klaus-Peter Keilig ◽  
Verena Stammberger ◽  
Michael Krautblatter
Keyword(s):  
Debris Flow ◽  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Limited Data ◽  
Erosion And Deposition ◽  
Highly Active ◽  
Flow Channels ◽  
Multi Temporal ◽  
Sediment Dynamic ◽  
Economic Goods

<p>Debris flows are destructive mass movements in steep alpine torrents. Due to their high magnitudes and impact pressures economic goods and human lives are threatened in inhabited areas. The amount of entrained material depends largely on the mobilisable loose debris available for transport, which in turn controls debris-flow mobility and runout. However, still very limited data exists regarding rates and controls of sediment recharge in debris-flow channels.</p><p>In June 2015 an extraordinary rainfall event triggered a debris flow in the Roßbichelgraben torrent in southern Germany. Twelve terrestrial laser scan campaigns (> 450 scans positions) and nine temporally synchronised UAV surveys were carried out between June 2015 and September 2019. Both TLS and SfM-based photogrammetry reveal the temporal, spatial and seasonal sediment dynamic in the channel. A nearby meteorological station recorded the rainfall intensity in 10 min intervals. The results show that both terrestrial laser scanning and SfM-based photogrammetry provide equivalent erosion and deposition volumes (difference < 5%). Between June 2015 and September 2019 the channel was refilled with material of adjacent slopes and the above lying catchment (≈ 1.2 m³/d), whereby a higher activity was observed in summer than in winter. In addition, the activity decreased with elapsed time since the debris-flow event, as most over-steepened river banks failed shortly after the event and stabilised over time. Short, intense rainstorm events best explain the sediment dynamic in the channel (R² up to 0.9).</p><p>The results contribute to better understand the sediment dynamic in highly active debris-flow channels and allow for a more reliable estimation of potential debris-flow volumes.</p>

Towards real-time global assessment of post-fire debris flow hazards with remotely sensed data

2021 ◽  
Author(s):  
Elijah Orland ◽  
Dalia Kirschbaum ◽  
Thomas Stanley
Keyword(s):  
Remote Sensing ◽  
Debris Flow ◽  
Real Time ◽  
Debris Flows ◽  
Remotely Sensed Data ◽  
Model Framework ◽  
Burned Areas ◽  
Early Results ◽  
Fire Debris ◽  
Debris Flow Initiation

<p>As the risk of wildfires increases worldwide, burned steeplands are vulnerable to the secondary hazard of widespread sediment mobilization through debris flows. Following an initial burn, sediment and soil previously restrained by vegetation are no longer consolidated, allowing for easy mobilization into channels and along steep hillslopes through runoff.  Sufficiently powerful rainfall incorporates entrained material into turbulent flows and serves as the primary trigger for debris flow initiation. There is thus an ongoing need to establish the relationship between rainfall and debris flow initiation based on a variety of spatiotemporal preconditions. Previous work establishes regional and local thresholds to constrain the effect of rainfall in recently burned areas, but no empirical or numerical solution has worldwide application. Building from regionally-based efforts in the U.S., this work considers how remote sensing data can be applied to better approximate the post-fire debris flow hazards worldwide using freely available global datasets and software. Our work assesses the utility of remote sensing resources for analyzing burn characteristics, topography, rainfall intensity/duration, and, thus, debris flow initiation. Early results show that global observations are sufficient to delineate background rainfall rates from storms likely to cause debris flows across a variety of burn severity and topographic conditions. However, the dearth of publicly-available post-fire debris flow inventories globally limit the ability to test how the model framework performs within different climatologic and morphologic areas. This work will present preliminary analysis over the Western United States and demonstrate the feasibility of a global, near-real time model to provide situational awareness of potential hazards within recently burned areas worldwide. Future work will also consider how global or regional precipitation forecasts may increase the lead time for improved early warning of these hazards.</p>

Landslide analysis by multi-temporal terrestrial laser scanning (TLS) data: the Mont de la Saxe landslide

2015 ◽  
Vol 35 ◽  
pp. 92-95 ◽  
Author(s):  
Stefano Crepaldi ◽  
Ye Zhao ◽  
Muriel Lavy ◽  
Gianpiero Amanzio ◽  
Enrico Suozzi ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Multi Temporal

scholarly journals Terrestrial laser scanning for quantifying small-scale vertical movements of the ground surface in Artic permafrost regions

2017 ◽  
Author(s):  
Sabrina Marx ◽  
Katharina Anders ◽  
Sofia Antonova ◽  
Inga Beck ◽  
Julia Boike ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Three Dimensional ◽  
Ground Surface ◽  
Terrestrial Laser Scanning ◽  
Spatial Sampling ◽  
Small Scale ◽  
Vertical Movements ◽  
North East ◽  
Multi Temporal ◽  
Permafrost Regions

Abstract. Three-dimensional data acquired by terrestrial laser scanning (TLS) provides an accurate representation of Earth's surface, which is commonly used to detect and quantify topographic changes on a small scale. However, in Arctic permafrost regions the tundra vegetation and the micro-topography have significant effects on the surface representation in the captured dataset. The resulting spatial sampling of the ground is never identical between two TLS surveys. Thus, monitoring of heave and subsidence in the context of permafrost processes are challenging. This study evaluates TLS for quantifying small-scale vertical movements in an area located within the continuous permafrost zone, 50 km north-east of Inuvik, Northwest Territories, Canada. We propose a novel filter strategy, which accounts for spatial sampling effects and identifies TLS points suitable for multi-temporal deformation analyses. Further important prerequisites must be met, such as accurate co-registration of the TLS datasets. We found that if the ground surface is captured by more than one TLS scan position, plausible subsidence rates (up to mm-scale) can be derived; compared to e.g. standard raster-based DEM difference maps which contain change rates strongly affected by sampling effects.

Evolution of a natural debris flow: In situ measurements of flow dynamics, video imagery, and terrestrial laser scanning

Geology ◽  
2010 ◽  
Vol 38 (8) ◽  
pp. 735-738 ◽  
Author(s):  
Scott W. McCoy ◽  
Jason W. Kean ◽  
Jeffrey A. Coe ◽  
Dennis M. Staley ◽  
Thad A. Wasklewicz ◽  
...  
Keyword(s):  
Debris Flow ◽  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
In Situ Measurements ◽  
Flow Dynamics ◽  
Video Imagery

Multi-temporal terrestrial laser scanning for modeling tree biomass change

2014 ◽  
Vol 318 ◽  
pp. 304-317 ◽  
Author(s):  
Shruthi Srinivasan ◽  
Sorin C. Popescu ◽  
Marian Eriksson ◽  
Ryan D. Sheridan ◽  
Nian-Wei Ku
Keyword(s):  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Tree Biomass ◽  
Multi Temporal
Sign in / Sign up

Export Citation Format

Share Document