Allen C Gellis, Ph.D. (Former Employee)
Science and Products
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Streamflow and fluvial sediment transport in Pool C, restored section of the Kissimmee River Streamflow and fluvial sediment transport in Pool C, restored section of the Kissimmee River
The Kissimmee River Restoration Project was authorized by Congress in 1992 to restore more than 64 km2 (square kilometers) of river/floodplain ecosystem including 69 km of meandering river channel and 10,900 hectares (ha) of wetlands. Although biologic monitoring is an integral and active part of the Kissimmee River restoration, by 2007 geomorphic monitoring that included sediment...
Authors
J. Pearman, Allen Gellis, Philip Habermehl
Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management
The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including...
Authors
Scott Ator, Vicki S. Blazer, John Brakebill, Donald Cahoon, Peter Claggett, Thomas Cronin, Judith Denver, Christine Densmore, Allen Gellis, Cliff Hupp, Jurate Landwehr, Michael Langland, Christopher Ottinger, Milan Pavich, Matthew Perry, Scott Phillips, Stephen Preston, Jeff Raffensperger, Barnett Rattner, Nancy Rybicki, Debra Willard
Land-use effects on erosion, sediment yields, and reservoir sedimentation: A case study in the Lago Loiza Basin, Puerto Rico Land-use effects on erosion, sediment yields, and reservoir sedimentation: A case study in the Lago Loiza Basin, Puerto Rico
Lago Loíza impounded in 1953 to supply San Juan, Puerto Rico, with drinking water; by 1994, it had lost 47% of its capacity. To characterize sedimentation in Lago Loíza, a study combining land-use history, hillslope erosion rates, and subbasin sediment yields was conducted. Sedimentation rates during the early part of the reservoir’s operation (1953– 1963) were slightly higher than the...
Authors
Allen Gellis, Richard M. T. Webb, S. McIntyre, William Wolfe
Channel and hillslope processes revisited in the Arroyo de los Frijoles watershed near Santa Fe, New Mexico Channel and hillslope processes revisited in the Arroyo de los Frijoles watershed near Santa Fe, New Mexico
Detailed documentation of geomorphic changes in the landscape of more than a few years is rarely possible. Channel cross sections, channel profiles, sediment deposition behind dams, and hillslope-erosion plots, originally benchmarked within several watersheds outside Santa Fe, New Mexico, in the 1950’s and 1960’s, for a 1966 report that documented processes and rates of arid-region...
Authors
Allen C. Gellis, William Emmett, Luna Leopold
Using cosmogenic nuclides to contrast rates of erosion and sediment yield in a semi-arid, arroyo-dominated landscape, Rio Puerco Basin, New Mexico Using cosmogenic nuclides to contrast rates of erosion and sediment yield in a semi-arid, arroyo-dominated landscape, Rio Puerco Basin, New Mexico
Analysis of in-situ-produced 10Be and 26Al in 52 fluvial sediment samples shows that millennial-scale rates of erosion vary widely (7 to 366 m Ma-1) through the lithologically and topographically complex Rio Puerco Basin of northern New Mexico. Using isotopic analysis of both headwater and downstream samples, we determined that the semi-arid, Rio Puerco Basin is eroding, on average...
Authors
P.R. Bierman, J.M. Reuter, M. Pavich, A. C. Gellis, M.W. Caffee, J. Larsen
Summary of suspended-sediment data for streams draining the Chesapeake Bay Watershed, water years 1952-2002 Summary of suspended-sediment data for streams draining the Chesapeake Bay Watershed, water years 1952-2002
U.S. Geological Survey suspended-sediment data from 1952 to 2002 from selected stream-gaging stations draining the nontidal parts of the Chesapeake Bay Watershed were summarized to identify areas in the Watershed with high suspended-sediment loads, yields, and concentrations. The suspended-sediment load data were separated into two periods, 1952?1984 and 1985?2001. In 1985, the...
Authors
Allen C. Gellis, William Banks, Michael Langland, Sarah Martucci
Modern sediment yield compared to geologic rates of sediment production in a semi-arid basin, New Mexico: Assessing the human impact Modern sediment yield compared to geologic rates of sediment production in a semi-arid basin, New Mexico: Assessing the human impact
In the semi-arid Arroyo Chavez basin of New Mexico, a 2.28 km2 sub-basin of the Rio Puerco, we contrasted short-term rates (3 years) of sediment yield measured with sediment traps and dams with long-term, geologic rates (???10 000 years) of sediment production measured using 10Be. Examination of erosion rates at different time-scales provides the opportunity to contrast the human impact...
Authors
A. C. Gellis, M.J. Pavich, P.R. Bierman, E.M. Clapp, A. Ellevein, S. Aby
Twentieth century arroyo changes in Chaco Culture National Historical Park Twentieth century arroyo changes in Chaco Culture National Historical Park
Chaco Wash arroyo channel changes in the 20th century have become a major concern of the National Park Service. Several archeologic and cultural sites are located in the Chaco Wash corridor; thus, increased erosional activity of Chaco Wash, such as channel incision and increased meandering, may affect these sites. Through field surveys, photogrammetric analyses, and reviews of existing...
Authors
Allen C. Gellis
Developing a geomorphic approach for ranking watersheds for rehabilitation, Zuni Indian Reservation, New Mexico Developing a geomorphic approach for ranking watersheds for rehabilitation, Zuni Indian Reservation, New Mexico
As a result of past erosion problems on the Zuni Indian Reservation in western New Mexico, the US Congress in 1990 authorized the Zuni Tribe to begin a program for watershed rehabilitation. This paper describes an approach to rank the most appropriate watersheds for rehabilitation for the Zuni Reservation. The approach was based on data collected during a 3-year study on geomorphic and
Authors
A. C. Gellis, A. Cheama, S.M. Lalio
Effects of land use on upland erosion, sediment transport, and reservoir sedimentation, Lago Loiza basin, Puerto Rico Effects of land use on upland erosion, sediment transport, and reservoir sedimentation, Lago Loiza basin, Puerto Rico
No abstract available.
Authors
A. C. Gellis, R. Webb, W.J. Wolfe, S. McIntyre
Characterization and evaluation of channel and hillslope erosion on the Zuni Indian Reservation, New Mexico, 1992-95 Characterization and evaluation of channel and hillslope erosion on the Zuni Indian Reservation, New Mexico, 1992-95
Like many areas of the southwestern United States, the Zuni Indian Reservation, New Mexico, has high rates of erosion, ranging from 95 to greater than 1,430 cubic meters per square kilometer per year. Erosion on the Zuni Indian Reservation includes channel erosion (arroyo incision and channel widening) and hillslope (sheetwash) erosion. The U.S. Geological Survey conducted a 3-year (1992...
Authors
A. C. Gellis
Surface-water and suspended-sediment inflow and outflow for Nutria Reservoir No. 3, Zuni Indian Reservation, New Mexico, March 1994 to September 1995 Surface-water and suspended-sediment inflow and outflow for Nutria Reservoir No. 3, Zuni Indian Reservation, New Mexico, March 1994 to September 1995
Surface-water and suspended-sediment inflow to and outflow from Nutria Reservoir No. 3 on the Zuni Indian Reservation, western New Mexico, were calculated. The period of study was March 3, 1994, to September 30, 1995. Total runoff into Nutria Reservoir No. 3 during the study period was 6,812 acre-feet. During the study period, 24,310 tons of suspended sediment was transported into
Authors
A. C. Gellis
Science and Products
Filter Total Items: 16
No Result Found
Filter Total Items: 66
Streamflow and fluvial sediment transport in Pool C, restored section of the Kissimmee River Streamflow and fluvial sediment transport in Pool C, restored section of the Kissimmee River
The Kissimmee River Restoration Project was authorized by Congress in 1992 to restore more than 64 km2 (square kilometers) of river/floodplain ecosystem including 69 km of meandering river channel and 10,900 hectares (ha) of wetlands. Although biologic monitoring is an integral and active part of the Kissimmee River restoration, by 2007 geomorphic monitoring that included sediment...
Authors
J. Pearman, Allen Gellis, Philip Habermehl
Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management Synthesis of U.S. Geological Survey science for the Chesapeake Bay ecosystem and implications for environmental management
The purpose of this report is to present a synthesis of the USGS Chesapeake Bay science related to the 2001-06 goals and provide implications for environmental management. The report provides USGS findings that address the science needs of the Chesapeake Bay Program (CBP) restoration goals and includes summaries of 1. land-use change; 2. water quality in the watershed, including...
Authors
Scott Ator, Vicki S. Blazer, John Brakebill, Donald Cahoon, Peter Claggett, Thomas Cronin, Judith Denver, Christine Densmore, Allen Gellis, Cliff Hupp, Jurate Landwehr, Michael Langland, Christopher Ottinger, Milan Pavich, Matthew Perry, Scott Phillips, Stephen Preston, Jeff Raffensperger, Barnett Rattner, Nancy Rybicki, Debra Willard
Land-use effects on erosion, sediment yields, and reservoir sedimentation: A case study in the Lago Loiza Basin, Puerto Rico Land-use effects on erosion, sediment yields, and reservoir sedimentation: A case study in the Lago Loiza Basin, Puerto Rico
Lago Loíza impounded in 1953 to supply San Juan, Puerto Rico, with drinking water; by 1994, it had lost 47% of its capacity. To characterize sedimentation in Lago Loíza, a study combining land-use history, hillslope erosion rates, and subbasin sediment yields was conducted. Sedimentation rates during the early part of the reservoir’s operation (1953– 1963) were slightly higher than the...
Authors
Allen Gellis, Richard M. T. Webb, S. McIntyre, William Wolfe
Channel and hillslope processes revisited in the Arroyo de los Frijoles watershed near Santa Fe, New Mexico Channel and hillslope processes revisited in the Arroyo de los Frijoles watershed near Santa Fe, New Mexico
Detailed documentation of geomorphic changes in the landscape of more than a few years is rarely possible. Channel cross sections, channel profiles, sediment deposition behind dams, and hillslope-erosion plots, originally benchmarked within several watersheds outside Santa Fe, New Mexico, in the 1950’s and 1960’s, for a 1966 report that documented processes and rates of arid-region...
Authors
Allen C. Gellis, William Emmett, Luna Leopold
Using cosmogenic nuclides to contrast rates of erosion and sediment yield in a semi-arid, arroyo-dominated landscape, Rio Puerco Basin, New Mexico Using cosmogenic nuclides to contrast rates of erosion and sediment yield in a semi-arid, arroyo-dominated landscape, Rio Puerco Basin, New Mexico
Analysis of in-situ-produced 10Be and 26Al in 52 fluvial sediment samples shows that millennial-scale rates of erosion vary widely (7 to 366 m Ma-1) through the lithologically and topographically complex Rio Puerco Basin of northern New Mexico. Using isotopic analysis of both headwater and downstream samples, we determined that the semi-arid, Rio Puerco Basin is eroding, on average...
Authors
P.R. Bierman, J.M. Reuter, M. Pavich, A. C. Gellis, M.W. Caffee, J. Larsen
Summary of suspended-sediment data for streams draining the Chesapeake Bay Watershed, water years 1952-2002 Summary of suspended-sediment data for streams draining the Chesapeake Bay Watershed, water years 1952-2002
U.S. Geological Survey suspended-sediment data from 1952 to 2002 from selected stream-gaging stations draining the nontidal parts of the Chesapeake Bay Watershed were summarized to identify areas in the Watershed with high suspended-sediment loads, yields, and concentrations. The suspended-sediment load data were separated into two periods, 1952?1984 and 1985?2001. In 1985, the...
Authors
Allen C. Gellis, William Banks, Michael Langland, Sarah Martucci
Modern sediment yield compared to geologic rates of sediment production in a semi-arid basin, New Mexico: Assessing the human impact Modern sediment yield compared to geologic rates of sediment production in a semi-arid basin, New Mexico: Assessing the human impact
In the semi-arid Arroyo Chavez basin of New Mexico, a 2.28 km2 sub-basin of the Rio Puerco, we contrasted short-term rates (3 years) of sediment yield measured with sediment traps and dams with long-term, geologic rates (???10 000 years) of sediment production measured using 10Be. Examination of erosion rates at different time-scales provides the opportunity to contrast the human impact...
Authors
A. C. Gellis, M.J. Pavich, P.R. Bierman, E.M. Clapp, A. Ellevein, S. Aby
Twentieth century arroyo changes in Chaco Culture National Historical Park Twentieth century arroyo changes in Chaco Culture National Historical Park
Chaco Wash arroyo channel changes in the 20th century have become a major concern of the National Park Service. Several archeologic and cultural sites are located in the Chaco Wash corridor; thus, increased erosional activity of Chaco Wash, such as channel incision and increased meandering, may affect these sites. Through field surveys, photogrammetric analyses, and reviews of existing...
Authors
Allen C. Gellis
Developing a geomorphic approach for ranking watersheds for rehabilitation, Zuni Indian Reservation, New Mexico Developing a geomorphic approach for ranking watersheds for rehabilitation, Zuni Indian Reservation, New Mexico
As a result of past erosion problems on the Zuni Indian Reservation in western New Mexico, the US Congress in 1990 authorized the Zuni Tribe to begin a program for watershed rehabilitation. This paper describes an approach to rank the most appropriate watersheds for rehabilitation for the Zuni Reservation. The approach was based on data collected during a 3-year study on geomorphic and
Authors
A. C. Gellis, A. Cheama, S.M. Lalio
Effects of land use on upland erosion, sediment transport, and reservoir sedimentation, Lago Loiza basin, Puerto Rico Effects of land use on upland erosion, sediment transport, and reservoir sedimentation, Lago Loiza basin, Puerto Rico
No abstract available.
Authors
A. C. Gellis, R. Webb, W.J. Wolfe, S. McIntyre
Characterization and evaluation of channel and hillslope erosion on the Zuni Indian Reservation, New Mexico, 1992-95 Characterization and evaluation of channel and hillslope erosion on the Zuni Indian Reservation, New Mexico, 1992-95
Like many areas of the southwestern United States, the Zuni Indian Reservation, New Mexico, has high rates of erosion, ranging from 95 to greater than 1,430 cubic meters per square kilometer per year. Erosion on the Zuni Indian Reservation includes channel erosion (arroyo incision and channel widening) and hillslope (sheetwash) erosion. The U.S. Geological Survey conducted a 3-year (1992...
Authors
A. C. Gellis
Surface-water and suspended-sediment inflow and outflow for Nutria Reservoir No. 3, Zuni Indian Reservation, New Mexico, March 1994 to September 1995 Surface-water and suspended-sediment inflow and outflow for Nutria Reservoir No. 3, Zuni Indian Reservation, New Mexico, March 1994 to September 1995
Surface-water and suspended-sediment inflow to and outflow from Nutria Reservoir No. 3 on the Zuni Indian Reservation, western New Mexico, were calculated. The period of study was March 3, 1994, to September 30, 1995. Total runoff into Nutria Reservoir No. 3 during the study period was 6,812 acre-feet. During the study period, 24,310 tons of suspended sediment was transported into
Authors
A. C. Gellis