2011
Mackey, Benjamin H.; Roering, Joshua J.; Lamb, Michael P.
Landslide-dammed paleolake perturbs marine sedimentation and drives genetic change in anadromous fish Journal Article
In: PNAS, vol. 108, no. 47, pp. 18905–18909, 2011.
Abstract | Links | BibTeX | Tags: anadromous fish, landslide, maine sedimentation, paleolake
@article{Mackeya2011,
title = {Landslide-dammed paleolake perturbs marine sedimentation and drives genetic change in anadromous fish},
author = {Benjamin H. Mackey and Joshua J. Roering and Michael P. Lamb},
url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Mackey_2011_PNAS.pdf},
doi = {10.1073/pnas.1110445108},
year = {2011},
date = {2011-11-01},
journal = {PNAS},
volume = {108},
number = {47},
pages = {18905–18909},
abstract = {Large bedrock landslides have been shown to modulate rates and processes of river activity by forming dams, forcing upstream aggradation of water and sediment, and generating catastrophic outburst floods. Less apparent is the effect of large landslide dams on river ecosystems and marine sedimentation. Combining analyses of 1-m resolution topographic data (acquired via airborne laser mapping) and field investigation, we present evidence for a large, landslide-dammed paleolake along the Eel River, CA. The landslide mass initiated from a high-relief, resistant outcrop which failed catastrophically, blocking the Eel River with an approximately 130-m-tall dam. Support for the resulting 55-km-long, 1.3-km3 lake includes subtle shorelines cut into bounding terrain, deltas, and lacustrine sediments radiocarbon dated to 22.5 ka. The landslide provides an explanation for the recent genetic divergence of local anadromous (ocean-run) steelhead trout (Oncorhynchus mykiss) by blocking their migration route and causing gene flow between summer run and winter run reproductive ecotypes. Further, the dam arrested the prodigious flux of sediment down the Eel River; this cessation is recorded in marine sedimentary deposits as a 10-fold reduction in deposition rates of Eel-derived sediment and constitutes a rare example of a terrestrial event transmitted through the dispersal system and recorded offshore.},
keywords = {anadromous fish, landslide, maine sedimentation, paleolake},
pubstate = {published},
tppubtype = {article}
}
Large bedrock landslides have been shown to modulate rates and processes of river activity by forming dams, forcing upstream aggradation of water and sediment, and generating catastrophic outburst floods. Less apparent is the effect of large landslide dams on river ecosystems and marine sedimentation. Combining analyses of 1-m resolution topographic data (acquired via airborne laser mapping) and field investigation, we present evidence for a large, landslide-dammed paleolake along the Eel River, CA. The landslide mass initiated from a high-relief, resistant outcrop which failed catastrophically, blocking the Eel River with an approximately 130-m-tall dam. Support for the resulting 55-km-long, 1.3-km3 lake includes subtle shorelines cut into bounding terrain, deltas, and lacustrine sediments radiocarbon dated to 22.5 ka. The landslide provides an explanation for the recent genetic divergence of local anadromous (ocean-run) steelhead trout (Oncorhynchus mykiss) by blocking their migration route and causing gene flow between summer run and winter run reproductive ecotypes. Further, the dam arrested the prodigious flux of sediment down the Eel River; this cessation is recorded in marine sedimentary deposits as a 10-fold reduction in deposition rates of Eel-derived sediment and constitutes a rare example of a terrestrial event transmitted through the dispersal system and recorded offshore.
2009
Roering, Joshua J.; Stimely, Laura L.; Mackey, Benjamin H.; Schmidt, David A.
Using DInSAR, airborne LiDAR, and archival air photos to quantify landsliding and sediment transport Journal Article
In: Geophysical Research Letters, vol. 36, no. 19, 2009.
Abstract | Links | BibTeX | Tags: DInSAR, landslide, LiDAR, sediment transport
@article{Roering2009,
title = {Using DInSAR, airborne LiDAR, and archival air photos to quantify landsliding and sediment transport},
author = {Joshua J. Roering and Laura L. Stimely and Benjamin H. Mackey and David A. Schmidt},
url = {https://angelo.berkeley.edu/wp-content/uploads/sites/59/Roering_2009_GeophyResLet.pdf},
doi = {10.1029/2009GL040374},
year = {2009},
date = {2009-10-15},
journal = {Geophysical Research Letters},
volume = {36},
number = {19},
abstract = {We demonstrate the ability of coupled remote sensing tools to characterize large, slow-moving landslides in the Eel River catchment, northern California. From a stack of ALOS interferograms, we identified 5 large (>1 km long) landslides that exhibited significant activity from February 2007 to February 2008. For the Boulder Creek earthflow, we used orthorectified air photos taken in 1964 and unfiltered airborne LiDAR flown in 2006 to map the displacement of trees growing on the landslide surface. Combining those displacement orientations with stacked DInSAR data, we observed average downslope velocities of 0.65 m yr−1 through the central transport zone of the landslide. Given landslide depth estimates, minimum sediment transport and denudation rates are estimated to be 4100 m3 yr−1 and 1.6 mm yr−1, respectively. Our results demonstrate the highly erosive role of large, slow-moving landslides in landscape evolution and suggest that the superposition of dense, ephemeral gully networks and rapidly moving zones within the landslide may facilitate delivery of slide-mobilized sediment into adjacent fluvial channels.},
keywords = {DInSAR, landslide, LiDAR, sediment transport},
pubstate = {published},
tppubtype = {article}
}
We demonstrate the ability of coupled remote sensing tools to characterize large, slow-moving landslides in the Eel River catchment, northern California. From a stack of ALOS interferograms, we identified 5 large (>1 km long) landslides that exhibited significant activity from February 2007 to February 2008. For the Boulder Creek earthflow, we used orthorectified air photos taken in 1964 and unfiltered airborne LiDAR flown in 2006 to map the displacement of trees growing on the landslide surface. Combining those displacement orientations with stacked DInSAR data, we observed average downslope velocities of 0.65 m yr−1 through the central transport zone of the landslide. Given landslide depth estimates, minimum sediment transport and denudation rates are estimated to be 4100 m3 yr−1 and 1.6 mm yr−1, respectively. Our results demonstrate the highly erosive role of large, slow-moving landslides in landscape evolution and suggest that the superposition of dense, ephemeral gully networks and rapidly moving zones within the landslide may facilitate delivery of slide-mobilized sediment into adjacent fluvial channels.