Ronald Griffiths
Ron Griffiths is a hydrologist with the Southwest Biological Science Center.
Science and Products
Filter Total Items: 32
Acoustic measurements on a shallow, sand-bed river: A case study from the Rio Grande Acoustic measurements on a shallow, sand-bed river: A case study from the Rio Grande
The Middle Rio Grande (MRG) is a dynamic and complex fluvial system where flow and sediment transported from the Upper Rio Grande and MRG tributaries influence the form of the river. How sediment is transported through the MRG is an important planning question as it addresses a wide range of concerns including flood control and river rehabilitation, thus continuous sediment measurements...
Authors
Jonathan AuBuchon, David Abraham, Ari Posner, Jeb E. Brown, Tony Jackson, Ronald E. Griffiths
Proceedings of the Fiscal Year 2022 Annual Reporting Meeting to the Glen Canyon Dam Adaptive Management Program Proceedings of the Fiscal Year 2022 Annual Reporting Meeting to the Glen Canyon Dam Adaptive Management Program
(Hartwell) This report is prepared primarily to account for work conducted and products delivered in FY 2022 by GCMRC and to inform the Technical Work Group of science conducted by GCMRC and its cooperators in support of the Glen Canyon Dam Adaptive Management Program (GCDAMP). It includes a summary of accomplishments, modifications to work plans, results, and recommendations related to...
Authors
David J. Topping, Paul E. Grams, Emily C. Palmquist, Joel B. Sankey, Helen C. Fairley, Bridget Deemer, Charles Yackulic, Theodore Kennedy, Anya Metcalfe, Maria C. Dzul, David Ward, Mariah Aurelia Giardina, Lucas Bair, Thomas M. Gushue, Caitlin M. Andrews, Ronald E. Griffiths, David J. Dean, Keith Kohl, Michael J Moran, Nicholas Voichick, Thomas A. Sabol, Laura A. Tennant, Kimberly Dibble, Michael C. Runge
Field investigation of sub-isokinetic sampling by the US D-96-type suspended-sediment sampler and its effect on suspended-sediment measurements Field investigation of sub-isokinetic sampling by the US D-96-type suspended-sediment sampler and its effect on suspended-sediment measurements
Collection of accurate suspended-sediment data using depth-integrating samplers requires that they operate isokinetically, that is, that they sample at the local stream velocity unaffected by the presence of the suspended-sediment sampler. Sub-isokinetic suspended-sediment sampling causes grain-size dependent positive biases in the suspended-sediment concentration measured by the...
Authors
Thomas A. Sabol, David J. Topping, Ronald E. Griffiths, Guillaume Dramais
Strandlines from large floods on the Colorado River in Grand Canyon National Park, Arizona Strandlines from large floods on the Colorado River in Grand Canyon National Park, Arizona
Strandlines of peak-stage indicators (such as driftwood logs, woody debris, and trash) provide valuable data for understanding the maximum stage and extent of inundation during floods. A series of seven strandlines have been preserved along the Colorado River in Grand Canyon National Park, Arizona, USA. A survey and analysis of these strandlines was completed from the Colorado River at...
Authors
Thomas A. Sabol, Ronald E. Griffiths, David J. Topping, Erich R. Mueller, Robert B. Tusso, Joseph E. Hazel
Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size
Bedrock-canyon rivers tend to be supply limited because they are efficient transporters of sediment and not because the upstream supply of sediment is small. A byproduct of this supply limitation is that the finer alluvium stored in these rivers has shorter residence times and smaller volumes than in alluvial rivers. To improve our understanding of disequilibrium sediment transport and...
Authors
David J. Topping, Paul E. Grams, Ronald E. Griffiths, David J. Dean, Scott Wright, Joel A. Unema
Interpreting flux-based sediment budgets in a habitat context: Linking precise temporal-resolution measurements of sediment flux to spatially robust characterization of channel change Interpreting flux-based sediment budgets in a habitat context: Linking precise temporal-resolution measurements of sediment flux to spatially robust characterization of channel change
Continuous measurements of sediment transport at reach-bracketing gaging stations allow for the construction of continuous mass-balance sediment budgets for the intervening reach. Although these budgets identify periods of sediment surplus (net deposition) or sediment deficit (net erosion), such analyses cannot identify the locations within the reach where channel change occurs. Because...
Authors
Christina Leonard, John C. Schmidt, David J. Topping, Ronald E. Griffiths
Science and Products
Filter Total Items: 32
Acoustic measurements on a shallow, sand-bed river: A case study from the Rio Grande Acoustic measurements on a shallow, sand-bed river: A case study from the Rio Grande
The Middle Rio Grande (MRG) is a dynamic and complex fluvial system where flow and sediment transported from the Upper Rio Grande and MRG tributaries influence the form of the river. How sediment is transported through the MRG is an important planning question as it addresses a wide range of concerns including flood control and river rehabilitation, thus continuous sediment measurements...
Authors
Jonathan AuBuchon, David Abraham, Ari Posner, Jeb E. Brown, Tony Jackson, Ronald E. Griffiths
Proceedings of the Fiscal Year 2022 Annual Reporting Meeting to the Glen Canyon Dam Adaptive Management Program Proceedings of the Fiscal Year 2022 Annual Reporting Meeting to the Glen Canyon Dam Adaptive Management Program
(Hartwell) This report is prepared primarily to account for work conducted and products delivered in FY 2022 by GCMRC and to inform the Technical Work Group of science conducted by GCMRC and its cooperators in support of the Glen Canyon Dam Adaptive Management Program (GCDAMP). It includes a summary of accomplishments, modifications to work plans, results, and recommendations related to...
Authors
David J. Topping, Paul E. Grams, Emily C. Palmquist, Joel B. Sankey, Helen C. Fairley, Bridget Deemer, Charles Yackulic, Theodore Kennedy, Anya Metcalfe, Maria C. Dzul, David Ward, Mariah Aurelia Giardina, Lucas Bair, Thomas M. Gushue, Caitlin M. Andrews, Ronald E. Griffiths, David J. Dean, Keith Kohl, Michael J Moran, Nicholas Voichick, Thomas A. Sabol, Laura A. Tennant, Kimberly Dibble, Michael C. Runge
Field investigation of sub-isokinetic sampling by the US D-96-type suspended-sediment sampler and its effect on suspended-sediment measurements Field investigation of sub-isokinetic sampling by the US D-96-type suspended-sediment sampler and its effect on suspended-sediment measurements
Collection of accurate suspended-sediment data using depth-integrating samplers requires that they operate isokinetically, that is, that they sample at the local stream velocity unaffected by the presence of the suspended-sediment sampler. Sub-isokinetic suspended-sediment sampling causes grain-size dependent positive biases in the suspended-sediment concentration measured by the...
Authors
Thomas A. Sabol, David J. Topping, Ronald E. Griffiths, Guillaume Dramais
Strandlines from large floods on the Colorado River in Grand Canyon National Park, Arizona Strandlines from large floods on the Colorado River in Grand Canyon National Park, Arizona
Strandlines of peak-stage indicators (such as driftwood logs, woody debris, and trash) provide valuable data for understanding the maximum stage and extent of inundation during floods. A series of seven strandlines have been preserved along the Colorado River in Grand Canyon National Park, Arizona, USA. A survey and analysis of these strandlines was completed from the Colorado River at...
Authors
Thomas A. Sabol, Ronald E. Griffiths, David J. Topping, Erich R. Mueller, Robert B. Tusso, Joseph E. Hazel
Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size Self-limitation of sand storage in a bedrock-canyon river arising from the interaction of flow and grain size
Bedrock-canyon rivers tend to be supply limited because they are efficient transporters of sediment and not because the upstream supply of sediment is small. A byproduct of this supply limitation is that the finer alluvium stored in these rivers has shorter residence times and smaller volumes than in alluvial rivers. To improve our understanding of disequilibrium sediment transport and...
Authors
David J. Topping, Paul E. Grams, Ronald E. Griffiths, David J. Dean, Scott Wright, Joel A. Unema
Interpreting flux-based sediment budgets in a habitat context: Linking precise temporal-resolution measurements of sediment flux to spatially robust characterization of channel change Interpreting flux-based sediment budgets in a habitat context: Linking precise temporal-resolution measurements of sediment flux to spatially robust characterization of channel change
Continuous measurements of sediment transport at reach-bracketing gaging stations allow for the construction of continuous mass-balance sediment budgets for the intervening reach. Although these budgets identify periods of sediment surplus (net deposition) or sediment deficit (net erosion), such analyses cannot identify the locations within the reach where channel change occurs. Because...
Authors
Christina Leonard, John C. Schmidt, David J. Topping, Ronald E. Griffiths