A5014602033- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Landslides and related hazards
- Geological formations and processes
- Geology and Paleoclimatology Research
- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Hydraulic flow and structures
- Cryospheric studies and observations
- Fish Ecology and Management Studies
- Fire effects on ecosystems
- Astro and Planetary Science
- Planetary Science and Exploration
- Aeolian processes and effects
- Freshwater macroinvertebrate diversity and ecology
- Tunneling and Rock Mechanics
- Hydraulic Fracturing and Reservoir Analysis
- Rock Mechanics and Modeling
- earthquake and tectonic studies
- Flood Risk Assessment and Management
- Geological and Geochemical Analysis
- Granular flow and fluidized beds
- Soil Geostatistics and Mapping
- Image Processing and 3D Reconstruction
- Plant responses to water stress
Simon Fraser University
2008-2025
San Francisco State University
2013-2024
Concordia University
2018-2024
Wayne State University
2014
University of California, Berkeley
1998-2011
Planetary Science Institute
2001-2008
Research Article| December 01, 2001 Sediment and rock strength controls on river incision into bedrock Leonard S. Sklar; Sklar 1Department of Earth Planetary Science, University California, 307 McCone Hall, Berkeley, California 94720-4767, USA Search for other works by this author on: GSW Google Scholar William E. Dietrich Geology (2001) 29 (12): 1087–1090. https://doi.org/10.1130/0091-7613(2001)029<1087:SARSCO>2.0.CO;2 Article history received: 05 Apr rev-recd: 11 Jul accepted: 27 first...
Abrasion by bed load is a ubiquitous and sometimes dominant erosional mechanism for fluvial incision into bedrock. Here we develop model bedrock abrasion saltating wherein the wear rate depends linearly on flux of impact kinetic energy normal to fraction that not armored transient deposits alluvium. We assume extent alluvial cover ratio coarse sediment supply transport capacity. Particle velocity frequency depend saltation trajectories, which can be predicted using empirical functions excess...
Meandering rivers are common on Earth and other planetary surfaces, yet the conditions necessary to maintain meandering channels unclear. As a consequence, self-maintaining with cutoffs have not been reproduced in laboratory. Such experimental needed explore mechanisms controlling migration rate, sinuosity, floodplain formation, planform morphodynamics test theories for wavelength bend propagation. Here we report an experiment which near-constant width was maintained during repeated cutoff...
Abstract Connectivity describes the efficiency of material transfer between geomorphic system components such as hillslopes and rivers or longitudinal segments within a river network. Representations systems networks should recognize that compartments, links, nodes exhibit connectivity at differing scales. The historical underpinnings in geomorphology involve management observations linking surface processes to landform dynamics. Current work emphasizes hydrological, sediment, landscape...
In transient landscapes, adjustments in river channel width, roughness, and alluvial cover, addition to slope, provide potentially important but poorly understood mechanisms by which bedrock channels accommodate changes external forcing. We used a laboratory flume investigate experimentally how incision rate collectively adjusted during the of an initially smooth with varying bed load supply rate. When was free focused over fraction width that varied strongly both transport capacity....
A mechanistic model is derived for the rate of fluvial erosion into bedrock by abrasion from uniform size particles that impact bed during transport in both and suspended load. The equated to product rate, mass loss per particle impact, a coverage term. Unlike previous models consider only load, not assumed tend zero as shear velocity approaches threshold suspension. Instead, given sediment supply distributed between load using formulas layer height, velocity, logarithmic fluid profile,...
Research Article| February 01, 2001 Hillslope evolution by nonlinear creep and landsliding: An experimental study Joshua J. Roering; Roering 1Department of Earth Planetary Science, University California, Berkeley, California 94720-4767, USA Search for other works this author on: GSW Google Scholar James W. Kirchner; Kirchner Leonard S. Sklar; Sklar William E. Dietrich Geology (2001) 29 (2): 143–146. https://doi.org/10.1130/0091-7613(2001)029<0143:HEBNCA>2.0.CO;2 Article history received: 01...
Field data from channels in the Henry Mountains of Utah demonstrate that abundant coarse sediment can inhibit fluvial incision into bedrock by armoring channel beds (the cover effect). We compare several small share tributary junctions and have incised same sedimentary unit (Navajo Sandstone) but contain differing amounts diorite clasts owing to spatial distribution localized sources. Bedrock (diorite‐rich) steeper longitudinal slopes than tributaries these with smaller drainage areas less...
River beds are often arranged into patches of similar grain size and sorting. Patches can be distinguished “free patches,” which zones sorted material that move freely, such as bed load sheets; “forced areas sorting forced by topographic controls; “fixed patches” rendered immobile through localized coarsening remain fairly persistent time. Two sets flume experiments (one using bimodal, sand‐rich sediment the other unimodal, sand‐free sediment) used to explore how fixed free respond stepwise...
Research Article| March 01, 2013 Fluvial features on Titan: Insights from morphology and modeling Devon M. Burr; Burr † 1Earth Planetary Sciences Department, University of Tennessee–Knoxville, 1412 Circle Drive, Knoxville, Tennessee 37996-1410, USA †E-mail: dburr1@utk.edu Search for other works by this author on: GSW Google Scholar J. Taylor Perron; Perron 2Department Earth, Atmospheric, Sciences, Massachusetts Institute Technology, 77 Avenue, Cambridge, 02139, Michael P. Lamb; Lamb...
up to 250 words) Bedrock rivers exert a critical control over landscape evolution, yet little is known about the sediment transport processes that affect their incision.We present theoretical analyses and field data demonstrate how grain entrainment, translation deposition are affected by degree of cover in bedrock channel.Theoretical considerations entrainment mechanics continuity each areas exposed thin depths cause be size-independent, albeit excluding extreme sizes.We report gravel...
Significance Rivers carve through landscapes using sediment produced on hillslopes by biological, chemical, and physical weathering of underlying bedrock. Both the size supply rate influence pace river incision landscape evolution, but connections remain poorly understood, because distributions supplied from slopes have been difficult to quantify. This study combined existing sediment-tracing techniques in a previously unidentified approach quantify production across an alpine catchment High...
[1] Understanding low impact development (LID) planning and best management practices (BMPs) effects on recharge is important because of the increasing use LID BMPs to reduce storm water runoff improve surface-water quality. are microscale, decentralized techniques such as vegetated systems, pervious pavement, infiltration trenches capture, reduce, filter, slow runoff. Some may enhance recharge, which has often been considered a secondary benefit. Here we report results field HYDRUS-2D...
Research Article| January 01, 2005 Field measurements of incision rates following bedrock exposure: Implications for process controls on the long profiles valleys cut by rivers and debris flows Jonathan D. Stock; Stock 1Department Earth Planetary Science, University California, Berkeley, California 94720, USA Search other works this author on: GSW Google Scholar David R. Montgomery; Montgomery 2Department Space Sciences, Washington, Seattle, Washington 98195, Brian Collins; Collins William...
We present results and analyses from flume experiments investigating the infiltration of sand into immobile clean gravel deposits. Three runs were conducted, each successive run with same total sediment feed volume, but a 10‐fold increase in rate. The highest rate produced less subsurface deposits than other two runs, which had approximately equivalent amounts infiltration. Experimental data, combined simple geometric relations physical principles, are used to derive describing saturated...
The effectiveness of gravel augmentation as a river restoration strategy depends on the extent and duration topographic bed texture changes created by pulse added sediment. Previous work has emphasized strong tendency for natural sediment waves to propagate primarily dispersion; however, translation may occur additions armored channels downstream dams where sediments are finer than preexisting material. Here we report results laboratory investigation in which an immobile, documented spatial...
Additions of sand to gravel beds greatly increase the mobility and flux gravel. However, it is not known how additions finer coarser will affect bed material. Here we examine effect fine pulses on material transport near‐bed flow dynamics in a series flume experiments. Bed refers exclusively sediment channel prior pulse introduction. The observations indicate that tend migrate downstream low‐amplitude waves. As waves pass over bed, interstitial pockets surface fill coarse particles are...