Ronald Griffiths
Ron Griffiths is a hydrologist with the Southwest Biological Science Center.
Science and Products
Filter Total Items: 32
Sediment supply versus local hydraulic controls on sediment transport and storage in a river with large sediment loads Sediment supply versus local hydraulic controls on sediment transport and storage in a river with large sediment loads
The Rio Grande in the Big Bend region of Texas, USA, and Chihuahua and Coahuila, Mexico, undergoes rapid geomorphic changes as a result of its large sediment supply and variable hydrology; thus, it is a useful natural laboratory to investigate the relative importance of flow strength and sediment supply in controlling alluvial channel change. We analyzed a suite of sediment transport and
Authors
David J. Dean, David J. Topping, John C. Schmidt, Ronald E. Griffiths, Thomas A. Sabol
Using 15-minute acoustic data to analyze suspended-sediment dynamics in the Rio Grande in the Big Bend Region Using 15-minute acoustic data to analyze suspended-sediment dynamics in the Rio Grande in the Big Bend Region
The Rio Grande in the Big Bend region is subject to rapid geomorphic change consisting of channel narrowing during years of low flow, and channel widening during rare, large, long duration floods. Since the 1940s, there have been large declines in mean and peak stream flow, and the channel has progressively narrowed. Large, channel widening floods are infrequent and have failed to widen...
Authors
David J. Dean, David J. Topping, Ronald E. Griffiths, Thomas A. Sabol, John C. Schmidt, Jeffery B. Bennett
Inaccuracies in sediment budgets arising from estimations of tributary sediment inputs: an example from a monitoring network on the southern Colorado plateau Inaccuracies in sediment budgets arising from estimations of tributary sediment inputs: an example from a monitoring network on the southern Colorado plateau
Sediment budgets are an important tool for understanding how riverine ecosystems respond to perturbations. Changes in the quantity and grain-size distribution of sediment within river systems affect the channel morphology and related habitat resources. It is therefore important for resource managers to know if a channel reach is in a state of sediment accumulation, deficit or stasis...
Authors
Ronald E. Griffiths, David J. Topping
Design of a sediment-monitoring gaging network on ephemeral tributaries of the Colorado River in Glen, Marble, and Grand Canyons, Arizona Design of a sediment-monitoring gaging network on ephemeral tributaries of the Colorado River in Glen, Marble, and Grand Canyons, Arizona
Management of sediment in rivers downstream from dams requires knowledge of both the sediment supply and downstream sediment transport. In some dam-regulated rivers, the amount of sediment supplied by easily measured major tributaries may overwhelm the amount of sediment supplied by the more difficult to measure lesser tributaries. In this first class of rivers, managers need only know...
Authors
Ronald E. Griffiths, David J. Topping, Robert S. Anderson, Gregory S. Hancock, Theodore S. Melis
Physically based method for measuring suspended-sediment concentration and grain size using multi-frequency arrays of acoustic-doppler profilers Physically based method for measuring suspended-sediment concentration and grain size using multi-frequency arrays of acoustic-doppler profilers
As the result of a 12-year program of sediment-transport research and field testing on the Colorado River (6 stations in UT and AZ), Yampa River (2 stations in CO), Little Snake River (1 station in CO), Green River (1 station in CO and 2 stations in UT), and Rio Grande (2 stations in TX), we have developed a physically based method for measuring suspended-sediment concentration and grain...
Authors
David J. Topping, Scott Wright, Ronald E. Griffiths, David J. Dean
Early responses to zebra mussels in the Great Lakes: a journey from information vacuum to policy and regulation Early responses to zebra mussels in the Great Lakes: a journey from information vacuum to policy and regulation
Invasive species such as zebra mussels pose a threat to the economies and environments of coastal and fresh-water habitats around the world. Consequently, it is important that government policies and programs be adequate to protect these waters from invaders. This chapter documents key events that took place in the early years (1988-1991) of zebra mussel colonization of the Laurentian...
Authors
Ronald W. Griffiths, Don W. Schloesser, William P. Kovalak
Science and Products
Filter Total Items: 32
Sediment supply versus local hydraulic controls on sediment transport and storage in a river with large sediment loads Sediment supply versus local hydraulic controls on sediment transport and storage in a river with large sediment loads
The Rio Grande in the Big Bend region of Texas, USA, and Chihuahua and Coahuila, Mexico, undergoes rapid geomorphic changes as a result of its large sediment supply and variable hydrology; thus, it is a useful natural laboratory to investigate the relative importance of flow strength and sediment supply in controlling alluvial channel change. We analyzed a suite of sediment transport and
Authors
David J. Dean, David J. Topping, John C. Schmidt, Ronald E. Griffiths, Thomas A. Sabol
Using 15-minute acoustic data to analyze suspended-sediment dynamics in the Rio Grande in the Big Bend Region Using 15-minute acoustic data to analyze suspended-sediment dynamics in the Rio Grande in the Big Bend Region
The Rio Grande in the Big Bend region is subject to rapid geomorphic change consisting of channel narrowing during years of low flow, and channel widening during rare, large, long duration floods. Since the 1940s, there have been large declines in mean and peak stream flow, and the channel has progressively narrowed. Large, channel widening floods are infrequent and have failed to widen...
Authors
David J. Dean, David J. Topping, Ronald E. Griffiths, Thomas A. Sabol, John C. Schmidt, Jeffery B. Bennett
Inaccuracies in sediment budgets arising from estimations of tributary sediment inputs: an example from a monitoring network on the southern Colorado plateau Inaccuracies in sediment budgets arising from estimations of tributary sediment inputs: an example from a monitoring network on the southern Colorado plateau
Sediment budgets are an important tool for understanding how riverine ecosystems respond to perturbations. Changes in the quantity and grain-size distribution of sediment within river systems affect the channel morphology and related habitat resources. It is therefore important for resource managers to know if a channel reach is in a state of sediment accumulation, deficit or stasis...
Authors
Ronald E. Griffiths, David J. Topping
Design of a sediment-monitoring gaging network on ephemeral tributaries of the Colorado River in Glen, Marble, and Grand Canyons, Arizona Design of a sediment-monitoring gaging network on ephemeral tributaries of the Colorado River in Glen, Marble, and Grand Canyons, Arizona
Management of sediment in rivers downstream from dams requires knowledge of both the sediment supply and downstream sediment transport. In some dam-regulated rivers, the amount of sediment supplied by easily measured major tributaries may overwhelm the amount of sediment supplied by the more difficult to measure lesser tributaries. In this first class of rivers, managers need only know...
Authors
Ronald E. Griffiths, David J. Topping, Robert S. Anderson, Gregory S. Hancock, Theodore S. Melis
Physically based method for measuring suspended-sediment concentration and grain size using multi-frequency arrays of acoustic-doppler profilers Physically based method for measuring suspended-sediment concentration and grain size using multi-frequency arrays of acoustic-doppler profilers
As the result of a 12-year program of sediment-transport research and field testing on the Colorado River (6 stations in UT and AZ), Yampa River (2 stations in CO), Little Snake River (1 station in CO), Green River (1 station in CO and 2 stations in UT), and Rio Grande (2 stations in TX), we have developed a physically based method for measuring suspended-sediment concentration and grain...
Authors
David J. Topping, Scott Wright, Ronald E. Griffiths, David J. Dean
Early responses to zebra mussels in the Great Lakes: a journey from information vacuum to policy and regulation Early responses to zebra mussels in the Great Lakes: a journey from information vacuum to policy and regulation
Invasive species such as zebra mussels pose a threat to the economies and environments of coastal and fresh-water habitats around the world. Consequently, it is important that government policies and programs be adequate to protect these waters from invaders. This chapter documents key events that took place in the early years (1988-1991) of zebra mussel colonization of the Laurentian...
Authors
Ronald W. Griffiths, Don W. Schloesser, William P. Kovalak