Craig Allan - Academia.edu (original) (raw)

Uploads

Papers by Craig Allan

Research paper thumbnail of An Analysis of Local and Combined (Global) Scours on Piers-on-Bank Bridges

CivilEng

This paper examines the scour problems related to piers-on-bank bridges resulting from frequently... more This paper examines the scour problems related to piers-on-bank bridges resulting from frequently flooded and/or constricted waterways. While local scour problems for bridge piers in riverine channels have been addressed extensively in the literature, there have been few studies addressing piers-on-bank scour scenarios. A comprehensive three-dimensional finite element analysis using the element removal (ER) technique has been performed on a recently constructed bridge with an observable scour problem on multiple piers. The analysis is further extended to study the effect of “combined scour” or extensive erosion of soil between adjacent piles. Three different loading cases were considered in the study, and the results demonstrated that the effects of local and combined scours on bridge drilled shaft foundations can be significant under the combined actions of axial, lateral loads and bending moments. Specifically, the most critical case of combined scour is when maximum moment effect...

Research paper thumbnail of Bathymetric survey of hydraulic structures using unmanned aerial systems and sonar

Research paper thumbnail of Sedimentation in a Piedmont Reservoir: Evidence from Brown’s Cove

Sedimentation in Brown’s Cove of Lake Wylie, North Carolina, can be reconstructed from historical... more Sedimentation in Brown’s Cove of Lake Wylie, North Carolina, can be reconstructed from historical records, cores, heavy mineral analysis, geochemical analysis, and 210Pb data. The sedimentology and sequence stratigraphy of the cores document changing sedimentary provenance, processes, and rates. Brown’s Cove was flooded in 1924, resulting in a transgressive sequence composed dominantly of suspension load deposited between 1924 and 1983. Based on air photos and cores, distributary channels on Beaverdam Creek delta supplied sediment to prograding, coarsening-upward delta lobes composed of turbidites grading up to traction load deposits. In 1983, a delta lobe began prograding into Brown’s Cove and was abandoned ca. 1993, leading to compaction, subsidence, and a second transgression. Another distributary avulsed to the site ca. 2003, resulting in a second prograding delta lobe. Prior to flooding of Brown’s Cove, mafic-rich fluvial sediments from the southern part of the watershed were a...

Research paper thumbnail of The Role of Riparian Vegetation in Protecting and Improving Chemical Water Quality in Streams

JAWRA Journal of the American Water Resources Association, 2010

Research paper thumbnail of Vegetated Swales for Managing Stormwater Runoff from Secondary Roads

Journal of Environmental Engineering

Research paper thumbnail of The Hydrology and Carbon Cycle of Freshwater Forested Wetlands, South Eastern U.S.A

Research paper thumbnail of Unified methodology for site-characterization and sampling of highway runoff

Frontiers of Environmental Science Engineering in China, 2010

Research paper thumbnail of Evaluation and Implementation of BMPs for NCDOT's Highway and Industrial Facilities

Research paper thumbnail of A Preliminary Assessment of Wet Deposition and Episodic Transport of Total and Methyl Metcury from Low Order Blue Ridge Watersheds, S.E. U.S.A

Water Air Soil Pollut, 1998

Research paper thumbnail of Hillslope hydrology and wetland response of two small zero-order boreal catchments on the Precambrian Shield

Hydrological Processes, Mar 18, 2007

Research paper thumbnail of Groundwater and Surface Water Hg Response to Clear-cut Logging

Agu Fall Meeting Abstracts, Dec 1, 2006

Research paper thumbnail of Changes in Total and Methyl Mercury Concentrations and Fluxes Resulting From Clearcut Logging and Drought in Boreal Forest Wetlands and Hillslope Groundwaters

Agu Fall Meeting Abstracts, Dec 1, 2007

Research paper thumbnail of Spatial and temporal dynamics of mercury in Precambrian Shield upland runoff

Research paper thumbnail of Forest Management Options to Maintain Hydrologic Connectivity in Boreal Forest Streams of Ontario

Research paper thumbnail of A Preliminary Assessment of Wet Deposition and Episodic Transport of Total and Methyl Mercury from Low Order Blue Ridge Watersheds, S.E. U.S.A

Research paper thumbnail of Aspects of the Chemistry of Ice, Notably Snow, on Lakes

Seasonal Snowcovers: Physics, Chemistry, Hydrology, 1987

Research paper thumbnail of Unified methodology for site-characterization and sampling of highway runoff

Frontiers of Environmental Science & Engineering in China, 2009

Research paper thumbnail of Hot Spots and Hot Moments in Riparian Zones: Potential for Improved Water Quality Management

JAWRA Journal of the American Water Resources Association, 2010

Research paper thumbnail of A Morphological and Economic Examination of Plunge Pools as Energy Dissipaters in Urban Stream Channels

Journal of the American Water Resources Association, 2005

Research paper thumbnail of Assessing the Hydrologic and Water Quality Benefits of a Network of Stormwater Control Measures in a SE U.S. Piedmont Watershed

JAWRA Journal of the American Water Resources Association, 2014

Research paper thumbnail of An Analysis of Local and Combined (Global) Scours on Piers-on-Bank Bridges

CivilEng

This paper examines the scour problems related to piers-on-bank bridges resulting from frequently... more This paper examines the scour problems related to piers-on-bank bridges resulting from frequently flooded and/or constricted waterways. While local scour problems for bridge piers in riverine channels have been addressed extensively in the literature, there have been few studies addressing piers-on-bank scour scenarios. A comprehensive three-dimensional finite element analysis using the element removal (ER) technique has been performed on a recently constructed bridge with an observable scour problem on multiple piers. The analysis is further extended to study the effect of “combined scour” or extensive erosion of soil between adjacent piles. Three different loading cases were considered in the study, and the results demonstrated that the effects of local and combined scours on bridge drilled shaft foundations can be significant under the combined actions of axial, lateral loads and bending moments. Specifically, the most critical case of combined scour is when maximum moment effect...

Research paper thumbnail of Bathymetric survey of hydraulic structures using unmanned aerial systems and sonar

Research paper thumbnail of Sedimentation in a Piedmont Reservoir: Evidence from Brown’s Cove

Sedimentation in Brown’s Cove of Lake Wylie, North Carolina, can be reconstructed from historical... more Sedimentation in Brown’s Cove of Lake Wylie, North Carolina, can be reconstructed from historical records, cores, heavy mineral analysis, geochemical analysis, and 210Pb data. The sedimentology and sequence stratigraphy of the cores document changing sedimentary provenance, processes, and rates. Brown’s Cove was flooded in 1924, resulting in a transgressive sequence composed dominantly of suspension load deposited between 1924 and 1983. Based on air photos and cores, distributary channels on Beaverdam Creek delta supplied sediment to prograding, coarsening-upward delta lobes composed of turbidites grading up to traction load deposits. In 1983, a delta lobe began prograding into Brown’s Cove and was abandoned ca. 1993, leading to compaction, subsidence, and a second transgression. Another distributary avulsed to the site ca. 2003, resulting in a second prograding delta lobe. Prior to flooding of Brown’s Cove, mafic-rich fluvial sediments from the southern part of the watershed were a...

Research paper thumbnail of The Role of Riparian Vegetation in Protecting and Improving Chemical Water Quality in Streams

JAWRA Journal of the American Water Resources Association, 2010

Research paper thumbnail of Vegetated Swales for Managing Stormwater Runoff from Secondary Roads

Journal of Environmental Engineering

Research paper thumbnail of The Hydrology and Carbon Cycle of Freshwater Forested Wetlands, South Eastern U.S.A

Research paper thumbnail of Unified methodology for site-characterization and sampling of highway runoff

Frontiers of Environmental Science Engineering in China, 2010

Research paper thumbnail of Evaluation and Implementation of BMPs for NCDOT's Highway and Industrial Facilities

Research paper thumbnail of A Preliminary Assessment of Wet Deposition and Episodic Transport of Total and Methyl Metcury from Low Order Blue Ridge Watersheds, S.E. U.S.A

Water Air Soil Pollut, 1998

Research paper thumbnail of Hillslope hydrology and wetland response of two small zero-order boreal catchments on the Precambrian Shield

Hydrological Processes, Mar 18, 2007

Research paper thumbnail of Groundwater and Surface Water Hg Response to Clear-cut Logging

Agu Fall Meeting Abstracts, Dec 1, 2006

Research paper thumbnail of Changes in Total and Methyl Mercury Concentrations and Fluxes Resulting From Clearcut Logging and Drought in Boreal Forest Wetlands and Hillslope Groundwaters

Agu Fall Meeting Abstracts, Dec 1, 2007

Research paper thumbnail of Spatial and temporal dynamics of mercury in Precambrian Shield upland runoff

Research paper thumbnail of Forest Management Options to Maintain Hydrologic Connectivity in Boreal Forest Streams of Ontario

Research paper thumbnail of A Preliminary Assessment of Wet Deposition and Episodic Transport of Total and Methyl Mercury from Low Order Blue Ridge Watersheds, S.E. U.S.A

Research paper thumbnail of Aspects of the Chemistry of Ice, Notably Snow, on Lakes

Seasonal Snowcovers: Physics, Chemistry, Hydrology, 1987

Research paper thumbnail of Unified methodology for site-characterization and sampling of highway runoff

Frontiers of Environmental Science & Engineering in China, 2009

Research paper thumbnail of Hot Spots and Hot Moments in Riparian Zones: Potential for Improved Water Quality Management

JAWRA Journal of the American Water Resources Association, 2010

Research paper thumbnail of A Morphological and Economic Examination of Plunge Pools as Energy Dissipaters in Urban Stream Channels

Journal of the American Water Resources Association, 2005

Research paper thumbnail of Assessing the Hydrologic and Water Quality Benefits of a Network of Stormwater Control Measures in a SE U.S. Piedmont Watershed

JAWRA Journal of the American Water Resources Association, 2014

Log In