Allen C Gellis, Ph.D. (Former Employee)
Science and Products
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Total nitrogen and suspended-sediment loads and identification of suspended-sediment sources in the Laurel Hill Creek watershed, Somerset County, Pennsylvania, water years 2010-11 Total nitrogen and suspended-sediment loads and identification of suspended-sediment sources in the Laurel Hill Creek watershed, Somerset County, Pennsylvania, water years 2010-11
Laurel Hill Creek is a watershed of 125 square miles located mostly in Somerset County, Pennsylvania, with small areas extending into Fayette and Westmoreland Counties. The upper part of the watershed is on the Pennsylvania Department of Environmental Protection 303(d) list of impaired streams because of siltation, nutrients, and low dissolved oxygen concentrations. The objectives of...
Authors
Ronald A. Sloto, Allen C. Gellis, Daniel G. Galeone
Anthropocene streams and base-level controls from historic dams in the unglaciated mid-Atlantic region, USA Anthropocene streams and base-level controls from historic dams in the unglaciated mid-Atlantic region, USA
Recently, widespread valley-bottom damming for water power was identified as a primary control on valley sedimentation in the mid-Atlantic US during the late seventeenth to early twentieth century. The timing of damming coincided with that of accelerated upland erosion during post-European settlement land-use change. In this paper, we examine the impact of local drops in base level on...
Authors
Dorothy Merritts, Robert Walter, Michael Rahnis, Jeff Hartranft, Scott Cox, Allen Gellis, Noel Potter, William Hilgartner, Michael J. Langland, Lauren Manion, Caitlin Lippincott, Sauleh Siddiqui, Zain Rehman, Chris Scheid, Laura Kratz, Andrea Shilling, Matthew Jenschke, Katherine Datin, Elizabeth Cranmer, Austin Reed, Derek Matuszewski, Mark Voli, Erik Ohlson, Ali Neugebauer, Aakash Ahamed, Conor Neal, Allison Winter, Steven Becker
Hydrologic Data for Deep Creek Lake and Selected Tributaries, Garrett County, Maryland, 2007-08 Hydrologic Data for Deep Creek Lake and Selected Tributaries, Garrett County, Maryland, 2007-08
Introduction Recent and ongoing efforts to develop the land in the area around Deep Creek Lake, Garrett County, Maryland, are expected to change the volume of sediment moving toward and into the lake, as well as impact the water quality of the lake and its many tributaries. With increased development, there is an associated increased demand for groundwater and surface-water withdrawals...
Authors
William S.L. Banks, William J. Davies, Allen C. Gellis, Andrew E. LaMotte, Wendy S. McPherson, Daniel J. Soeder
Suspended-sediment sources in an urban watershed, Northeast Branch Anacostia River, Maryland Suspended-sediment sources in an urban watershed, Northeast Branch Anacostia River, Maryland
Fine sediment sources were characterized by chemical composition in an urban watershed, the Northeast Branch Anacostia River, which drains to the Chesapeake Bay. Concentrations of 63 elements and two radionuclides were measured in possible land-based sediment sources and suspended sediment collected from the water column at the watershed outlet during storm events. These tracer...
Authors
Olivia H. Devereux, Karen L. Prestegaard, Brian A. Needelman, Allen C. Gellis
Fluvial sediment in the environment: a national challenge Fluvial sediment in the environment: a national challenge
Sediment and sediment-associated constituents can contribute substantially to water-quality impairment. In the past, sediment was viewed mainly as an engineering problem that affected reservoir storage capacity, shipping channel maintenance, and bridge scour, as well as the loss of agricultural soil. Sediment is now recognized as a major cause of aquatic system degradation in many rivers...
Authors
Matthew C. Larsen, Allen C. Gellis, G. Douglas Glysson, John R. Gray, Arthur J. Horowitz
Sources, transport, and storage of sediment at selected sites in the Chesapeake Bay Watershed Sources, transport, and storage of sediment at selected sites in the Chesapeake Bay Watershed
The Chesapeake Bay Watershed covers 165,800 square kilometers and is supplied with water and sediment from five major physiographic provinces: Appalachian Plateau, Blue Ridge, Coastal Plain, Piedmont, and the Valley and Ridge. Suspended-sediment loads measured in the Chesapeake Bay Watershed showed that the Piedmont Physiographic Province has the highest rates of modern (20th Century)...
Authors
Allen C. Gellis, Cliff R. Hupp, Milan J. Pavich, Jurate M. Landwehr, William S.L. Banks, Bernard E. Hubbard, Michael J. Langland, Jerry C. Ritchie, Joanna M. Reuter
Science and Products
Filter Total Items: 16
No Result Found
Filter Total Items: 66
Total nitrogen and suspended-sediment loads and identification of suspended-sediment sources in the Laurel Hill Creek watershed, Somerset County, Pennsylvania, water years 2010-11 Total nitrogen and suspended-sediment loads and identification of suspended-sediment sources in the Laurel Hill Creek watershed, Somerset County, Pennsylvania, water years 2010-11
Laurel Hill Creek is a watershed of 125 square miles located mostly in Somerset County, Pennsylvania, with small areas extending into Fayette and Westmoreland Counties. The upper part of the watershed is on the Pennsylvania Department of Environmental Protection 303(d) list of impaired streams because of siltation, nutrients, and low dissolved oxygen concentrations. The objectives of...
Authors
Ronald A. Sloto, Allen C. Gellis, Daniel G. Galeone
Anthropocene streams and base-level controls from historic dams in the unglaciated mid-Atlantic region, USA Anthropocene streams and base-level controls from historic dams in the unglaciated mid-Atlantic region, USA
Recently, widespread valley-bottom damming for water power was identified as a primary control on valley sedimentation in the mid-Atlantic US during the late seventeenth to early twentieth century. The timing of damming coincided with that of accelerated upland erosion during post-European settlement land-use change. In this paper, we examine the impact of local drops in base level on...
Authors
Dorothy Merritts, Robert Walter, Michael Rahnis, Jeff Hartranft, Scott Cox, Allen Gellis, Noel Potter, William Hilgartner, Michael J. Langland, Lauren Manion, Caitlin Lippincott, Sauleh Siddiqui, Zain Rehman, Chris Scheid, Laura Kratz, Andrea Shilling, Matthew Jenschke, Katherine Datin, Elizabeth Cranmer, Austin Reed, Derek Matuszewski, Mark Voli, Erik Ohlson, Ali Neugebauer, Aakash Ahamed, Conor Neal, Allison Winter, Steven Becker
Hydrologic Data for Deep Creek Lake and Selected Tributaries, Garrett County, Maryland, 2007-08 Hydrologic Data for Deep Creek Lake and Selected Tributaries, Garrett County, Maryland, 2007-08
Introduction Recent and ongoing efforts to develop the land in the area around Deep Creek Lake, Garrett County, Maryland, are expected to change the volume of sediment moving toward and into the lake, as well as impact the water quality of the lake and its many tributaries. With increased development, there is an associated increased demand for groundwater and surface-water withdrawals...
Authors
William S.L. Banks, William J. Davies, Allen C. Gellis, Andrew E. LaMotte, Wendy S. McPherson, Daniel J. Soeder
Suspended-sediment sources in an urban watershed, Northeast Branch Anacostia River, Maryland Suspended-sediment sources in an urban watershed, Northeast Branch Anacostia River, Maryland
Fine sediment sources were characterized by chemical composition in an urban watershed, the Northeast Branch Anacostia River, which drains to the Chesapeake Bay. Concentrations of 63 elements and two radionuclides were measured in possible land-based sediment sources and suspended sediment collected from the water column at the watershed outlet during storm events. These tracer...
Authors
Olivia H. Devereux, Karen L. Prestegaard, Brian A. Needelman, Allen C. Gellis
Fluvial sediment in the environment: a national challenge Fluvial sediment in the environment: a national challenge
Sediment and sediment-associated constituents can contribute substantially to water-quality impairment. In the past, sediment was viewed mainly as an engineering problem that affected reservoir storage capacity, shipping channel maintenance, and bridge scour, as well as the loss of agricultural soil. Sediment is now recognized as a major cause of aquatic system degradation in many rivers...
Authors
Matthew C. Larsen, Allen C. Gellis, G. Douglas Glysson, John R. Gray, Arthur J. Horowitz
Sources, transport, and storage of sediment at selected sites in the Chesapeake Bay Watershed Sources, transport, and storage of sediment at selected sites in the Chesapeake Bay Watershed
The Chesapeake Bay Watershed covers 165,800 square kilometers and is supplied with water and sediment from five major physiographic provinces: Appalachian Plateau, Blue Ridge, Coastal Plain, Piedmont, and the Valley and Ridge. Suspended-sediment loads measured in the Chesapeake Bay Watershed showed that the Piedmont Physiographic Province has the highest rates of modern (20th Century)...
Authors
Allen C. Gellis, Cliff R. Hupp, Milan J. Pavich, Jurate M. Landwehr, William S.L. Banks, Bernard E. Hubbard, Michael J. Langland, Jerry C. Ritchie, Joanna M. Reuter