A5053547865- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Hydraulic flow and structures
- Flood Risk Assessment and Management
- Geological formations and processes
- Fish Ecology and Management Studies
- Fluid Dynamics and Turbulent Flows
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Land Use and Ecosystem Services
- Aerodynamics and Acoustics in Jet Flows
- Soil and Water Nutrient Dynamics
- Remote Sensing and LiDAR Applications
- Archaeology and Natural History
- Aeolian processes and effects
- Philosophy and History of Science
- Geographic Information Systems Studies
- Water Quality and Resources Studies
- Science and Climate Studies
- Geochemistry and Geologic Mapping
- Satellite Image Processing and Photogrammetry
- Underwater Acoustics Research
- Coastal and Marine Management
- Historical Geography and Geographical Thought
University of Illinois Urbana-Champaign
2016-2025
University of Illinois System
1987-2022
Urbana University
1993-2018
International University of the Caribbean
2018
Indiana University Bloomington
2018
Texas A&M University
2008
University of Illinois Chicago
1991
Arizona State University
1984-1986
1. Rivers: environment, process and form: Keith S.Richards (Department of Geography, University Cambridge) 2. Spatial adjustments to temporal variations in flood regime some Australian rivers: Robin F.Warner Sydney) 3. The effect active tectonics on alluvial river morphology: Daniel I.Gregory (Water Engineering Technology Inc., Colorado) Stanley A.Schumm Earth Sciences, Colorado State University) 4. Modelling fluvial systems: rock, gravel sand bed channels: Alan D.Howard Environmental...
Abstract A recent opinion piece rekindled debate as to whether geography's current interdisciplinary make‐up is a historical relic or an actual and potential source of intellectual vitality. Taking the latter position, we argue here for benefits sustained integration physical critical human geography. For reasons both political pragmatic, term this area intermingled research practice geography (CPG). CPG combines attention power relations with deep knowledge biophysical science technology in...
ABSTRACT The use of acoustic Doppler current profilers (ADCP) for discharge measurements and three‐dimensional flow mapping has increased rapidly in recent years been primarily driven by advances technology signal processing. Recent research developed a variety methods processing data obtained from range ADCP deployments this paper builds on progress describing new software visualizing collected along transects rivers or other bodies water. utility, the Velocity Mapping Toolbox (VMT), allows...
Measurements of downstream and cross-stream velocities at a small, asymmetrical stream confluence show that the structure low-stage flows is influenced by tributary/main stem momentum flux ratio, total discharge incoming flows, bed morphology. Flow accelerates through during all three measured events. This acceleration associated with reduction in channel capacity caused part presence large bar along inner bank channel. As ratio increases, flow from lateral tributary increasingly deflects...
Stream confluences are characterized by complex patterns of three‐dimensional fluid motion. This paper examines the time‐averaged flow structure at three concordant‐bed in east central Illinois. Two junctions have symmetrical planforms, whereas other has an asymmetrical planform. Similarities among sites include (1) pronounced convergence upstream end confluences, (2) a region stagnated near junction corner, (3) well‐defined thermal mixing interface between converging flows that persists...
Abstract: Over the past 10 years Rosgen classification system and its associated methods of “natural channel design” have become synonymous to some with term “stream restoration” science fluvial geomorphology. Since mid 1990s, this approach has widely adopted by governmental agencies, particularly those funding restoration projects. The purposes article are present a critical review, highlight inconsistencies identify technical problems Rosgen’s stream restoration. This paper’s primary...
Abstract The planform dynamics of meandering rivers produce a complex array meander forms, including elongated loops. Thus far, few studies have examined in detail the flow structure within loops and relation to patterns change. This field‐based investigation examines relations between three‐dimensional fluid motion channel change an elongated, asymmetrical loop containing multiple pool–riffle structures. downstream velocity field is characterized by high‐velocity core that shifts slightly...
River confluences are complex hydrodynamic environments where convergence of incoming flows produces complicated patterns fluid motion, including the development large‐scale turbulence structures. Accurately simulating confluence hydrodynamics represents a considerable challenge for numerical modeling river flows. This study uses an eddy‐resolving model to simulate mean flow and structure at asymmetrical with concordant bed when momentum ratio between two streams is close 1. Results...
The practice of dam removal has received increasing attention as a consequence maintenance and liability concerns related to the advanced age many these structures. Most dams that have been removed thus far are small run-of-river As number removals increases, it is crucial understand effects structures on river geomorphology sedimentology while in place how rivers respond so possible responses future can be anticipated predicted. This paper reviews current knowledge influence hydraulics...
Abstract Hydrological regimes strongly influence the biotic diversity of river ecosystems by structuring physical habitat within channels and on floodplains. Modification hydrological dam construction can have important consequences for ecosystems. This study examines impacts two dams, Gezhouba Dam Three Gorges Dam, regime Yangtze River in China. Analysis change before after is investigated evaluating changes medians ranges variability 33 parameters. Results show that impact relatively...
Mixing interfaces at confluences have been viewed as analogous to shallow mixing layers in which lateral fluxes of momentum generally are unimportant. This investigation examines the spatial evolution flow along a confluence interface, focusing on momentum. Cross‐stream profiles depth‐averaged mean velocities indicate that within interface has wake characteristics near upstream junction corner, mixing‐layer properties confluence, and attributes weak jet downstream channel. Convective...
The flow and turbulence structure at stream confluences are characterized by the formation of a mixing interface (MI) and, in some cases, streamwise‐oriented vortical (SOV) cells flanking MI. Depending on junction angle planform symmetry, as well velocity ratio across MI, MI can be Kelvin‐Helmholtz (KH) mode or wake mode. In former case, contains predominantly co‐rotating large‐scale quasi two‐dimensional (2‐D) eddies whose growth is driven KH instability vortex pairing. latter populated 2‐D...
[1] Although it is widely acknowledged that spatial heterogeneity in floodplain erosional resistance should affect the planform evolution of meandering rivers, past studies have not systematically explored importance this effect. Using a physically-based model river and stochastically-generated heterogeneous landscapes, we analyze detail how variability influences meander emergence complexity. The simulated planforms are remarkably similar to natural freely-meandering both visually their...
[1] This paper documents the three-dimensional structure of flow and bed morphology two developing chute cutoffs on a single meander bend lower Wabash River, USA, relates to patterns morphologic change in evolving cutoff channels. The upstream end channels is characterized by: (1) zone velocity reduction/stagnation bar development main channel across from entrance, (2) separation along inner (left) bank immediately downstream (3) helical motion outward advection momentum entering channel,...