Jessie Lacy
Research Oceanographer with the USGS Pacific Coastal and Marine Science Center
My research interests include: Hydrodynamics of the coastal ocean, estuaries, and lakes; Lateral dynamics in estuaries with complex topography, and their influence on mixing; The dynamics of stratification and baroclinic transport; Estimation of bottom roughness, bottom shear stress, and sediment resuspension in wave-dominated environments; Interaction between aquatic vegetation and hydrodynamics
Science and Products
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Evaluation of a Single-Beam Sonar System to Map Seagrass at Two Sites in Northern Puget Sound, Washington Evaluation of a Single-Beam Sonar System to Map Seagrass at Two Sites in Northern Puget Sound, Washington
Seagrass at two sites in northern Puget Sound, Possession Point and nearby Browns Bay, was mapped using both a single-beam sonar and underwater video camera. The acoustic and underwater video data were compared to evaluate the accuracy of acoustic estimates of seagrass cover. The accuracy of the acoustic method was calculated for three classifications of seagrass observed in underwater...
Authors
Andrew W. Stevens, Jessica Lacy, David Finlayson, Guy Gelfenbaum
Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004 Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004
Data presented in this report originates from measurements obtained off the Florida coast (fig. 1) as part of the Sediment Acoustics Experiment (SAX04) and Ripples Department Research Initiative (DRI) (Office of Naval Research (ONR), Critical Benthic Environmental Processes and Modeling, Long Range BAA 04-001, Sept. 10, 2003). The aim of this document is to present methods employed to...
Authors
Daniel Hanes, Li H. Erikson, Jamie Lescinski, Jodi Harney, Carissa Carter, Gerry A. Hatcher, Jessica Lacy, David Rubin
Bed forms created by simulated waves and currents in a large flume Bed forms created by simulated waves and currents in a large flume
The morphology and evolution of bed forms created by combinations of waves and currents were investigated using an oscillating plate in a 4-m-wide flume. Current speed ranged from 0 to 30 cm/s, maximum oscillatory velocity ranged from 20 to 48 cm/s, oscillation period was 8 s (except for one run with 12 s period), and the median grain size was 0.27 mm. The angle between oscillations and...
Authors
Jessica Lacy, David Rubin, Hiroshi Ikeda, Kuniyasu Mokudai, Daniel Hanes
Shear velocity estimates on the inner shelf off Grays Harbor, Washington, USA Shear velocity estimates on the inner shelf off Grays Harbor, Washington, USA
Shear velocity was estimated from current measurements near the bottom off Grays Harbor, Washington between May 4 and June 6, 2001 under mostly wave-dominated conditions. A downward-looking pulse-coherent acoustic Doppler profiler (PCADP) and two acoustic-Doppler velocimeters (field version; ADVFs) were deployed on a tripod at 9-m water depth. Measurements from these instruments were...
Authors
C. Sherwood, J.R. Lacy, G. Voulgaris
Estimating hydrodynamic roughness in a wave-dominated environment with a high-resolution acoustic Doppler profiler Estimating hydrodynamic roughness in a wave-dominated environment with a high-resolution acoustic Doppler profiler
Hydrodynamic roughness is a critical parameter for characterizing bottom drag in boundary layers, and it varies both spatially and temporally due to variation in grain size, bedforms, and saltating sediment. In this paper we investigate temporal variability in hydrodynamic roughness using velocity profiles in the bottom boundary layer measured with a high-resolution acoustic Doppler...
Authors
J.R. Lacy, C. Sherwood, D.J. Wilson, T.A. Chisholm, G.R. Gelfenbaum
Accuracy of a pulse-coherent acoustic Doppler profiler in a wave-dominated flow Accuracy of a pulse-coherent acoustic Doppler profiler in a wave-dominated flow
The accuracy of velocities measured by a pulse-coherent acoustic Doppler profiler (PCADP) in the bottom boundary layer of a wave-dominated inner-shelf environment is evaluated. The downward-looking PCADP measured velocities in eight 10-cm cells at 1 Hz. Velocities measured by the PCADP are compared to those measured by an acoustic Doppler velocimeter for wave orbital velocities up to 95...
Authors
J.R. Lacy, C. Sherwood
Data files from the Grays Harbor Sediment Transport Experiment Spring 2001 Data files from the Grays Harbor Sediment Transport Experiment Spring 2001
This publication consists of two DVD-ROMs, both of which are presented here. This report describes data collected during the Spring 2001 Grays Harbor Sediment Transport Experiment, and provides additional information needed to interpret the data. Two DVDs accompany this report; both contain documentation in html format that assist the user in navigating through the data. DVD-ROM-1...
Authors
Laura Landerman, Christopher Sherwood, Guy Gelfenbaum, Jessica Lacy, Peter Ruggiero, Douglas Wilson, Tom Chisholm, Keith Kurrus
Interaction of lateral baroclinic forcing and turbulence in an estuary Interaction of lateral baroclinic forcing and turbulence in an estuary
Observations of density and velocity in a channel in northern San Francisco Bay show that the onset of vertical density stratification during flood tides is controlled by the balance between the cross-channel baroclinic pressure gradient and vertical mixing due to turbulence. Profiles of velocity, salinity, temperature, and suspended sediment concentration were measured in transects...
Authors
J.R. Lacy, M.T. Stacey, J.R. Burau, Stephen G. Monismith
Secondary currents in a curved, stratified, estuarine channel Secondary currents in a curved, stratified, estuarine channel
This paper presents a study of secondary circulation in a curved stratified channel in northern San Francisco Bay over a 12.5-hour tidal cycle. Secondary currents were strong at times (varying by up to 35 cm/s from top to bottom) but relatively transient, as the balance between centrifugal and lateral baroclinic forcing changed over time. The short travel time around the bend did not...
Authors
J.R. Lacy, Stephen G. Monismith
Recent research on the hydrodynamics of the Sacramento - San Joaquin River Delta and north San Francisco Bay Recent research on the hydrodynamics of the Sacramento - San Joaquin River Delta and north San Francisco Bay
This article presents an overview of recent findings from hydrodynamic research on circulation and mixing in the Sacramento-San Joaquin Delta (Delta) (Figure 1) and North San Francisco Bay (North Bay) (Figure 2). For the purposes of this article, North Bay includes San Pablo Bay, Carquinez Strait, and Suisun Bay. The findings presented are those gained from field studies carried out by...
Authors
Jon Burau, Stephen G. Monismith, Mark T. Stacey, Richard Oltmann, Jessica Lacy, David H. Schoellhamer
Suspended-solids flux at a shallow-water site in south San Francisco Bay, California Suspended-solids flux at a shallow-water site in south San Francisco Bay, California
Time series measurements of current velocity and suspended solids-concentration (SSC) made during December 1993 and March 1994 at a shallow-water site in South San Francisco Bay were used to estimate and compare suspended-solids flux during the two periods. In December, the average residual flux at the site was 2.88 g/m/s, to the northeast, whereas in March the average residual flux was...
Authors
Jessica Lacy, David H. Schoellhamer, Jon Burau
1994 Annual report: San Francisco Estuary regional monitoring program for trace substances 1994 Annual report: San Francisco Estuary regional monitoring program for trace substances
This is the second Annual Report of the Regional Monitoring Program for Trace Substances (RMP). It describes concentrations of pollutants in water, sediment, and tissue samples of oysters, mussels, and clams at 15 to 24 sampling locations for three discrete sampling events - during the wet season in February, in April during a period of declining Delta outflows, and during the dry season...
Authors
Bruce Thompson, Jay Davis, Margaret Johnston, E. Johnston, Jessica Lacy, Kimberly Taylor, John Hunt, Brian Anderson
Science and Products
Filter Total Items: 16
No Result Found
Filter Total Items: 49
Evaluation of a Single-Beam Sonar System to Map Seagrass at Two Sites in Northern Puget Sound, Washington Evaluation of a Single-Beam Sonar System to Map Seagrass at Two Sites in Northern Puget Sound, Washington
Seagrass at two sites in northern Puget Sound, Possession Point and nearby Browns Bay, was mapped using both a single-beam sonar and underwater video camera. The acoustic and underwater video data were compared to evaluate the accuracy of acoustic estimates of seagrass cover. The accuracy of the acoustic method was calculated for three classifications of seagrass observed in underwater...
Authors
Andrew W. Stevens, Jessica Lacy, David Finlayson, Guy Gelfenbaum
Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004 Seabed ripple morphology and surficial sediment size at the SAX04 experiments near Fort Walton Beach, Florida, fall 2004
Data presented in this report originates from measurements obtained off the Florida coast (fig. 1) as part of the Sediment Acoustics Experiment (SAX04) and Ripples Department Research Initiative (DRI) (Office of Naval Research (ONR), Critical Benthic Environmental Processes and Modeling, Long Range BAA 04-001, Sept. 10, 2003). The aim of this document is to present methods employed to...
Authors
Daniel Hanes, Li H. Erikson, Jamie Lescinski, Jodi Harney, Carissa Carter, Gerry A. Hatcher, Jessica Lacy, David Rubin
Bed forms created by simulated waves and currents in a large flume Bed forms created by simulated waves and currents in a large flume
The morphology and evolution of bed forms created by combinations of waves and currents were investigated using an oscillating plate in a 4-m-wide flume. Current speed ranged from 0 to 30 cm/s, maximum oscillatory velocity ranged from 20 to 48 cm/s, oscillation period was 8 s (except for one run with 12 s period), and the median grain size was 0.27 mm. The angle between oscillations and...
Authors
Jessica Lacy, David Rubin, Hiroshi Ikeda, Kuniyasu Mokudai, Daniel Hanes
Shear velocity estimates on the inner shelf off Grays Harbor, Washington, USA Shear velocity estimates on the inner shelf off Grays Harbor, Washington, USA
Shear velocity was estimated from current measurements near the bottom off Grays Harbor, Washington between May 4 and June 6, 2001 under mostly wave-dominated conditions. A downward-looking pulse-coherent acoustic Doppler profiler (PCADP) and two acoustic-Doppler velocimeters (field version; ADVFs) were deployed on a tripod at 9-m water depth. Measurements from these instruments were...
Authors
C. Sherwood, J.R. Lacy, G. Voulgaris
Estimating hydrodynamic roughness in a wave-dominated environment with a high-resolution acoustic Doppler profiler Estimating hydrodynamic roughness in a wave-dominated environment with a high-resolution acoustic Doppler profiler
Hydrodynamic roughness is a critical parameter for characterizing bottom drag in boundary layers, and it varies both spatially and temporally due to variation in grain size, bedforms, and saltating sediment. In this paper we investigate temporal variability in hydrodynamic roughness using velocity profiles in the bottom boundary layer measured with a high-resolution acoustic Doppler...
Authors
J.R. Lacy, C. Sherwood, D.J. Wilson, T.A. Chisholm, G.R. Gelfenbaum
Accuracy of a pulse-coherent acoustic Doppler profiler in a wave-dominated flow Accuracy of a pulse-coherent acoustic Doppler profiler in a wave-dominated flow
The accuracy of velocities measured by a pulse-coherent acoustic Doppler profiler (PCADP) in the bottom boundary layer of a wave-dominated inner-shelf environment is evaluated. The downward-looking PCADP measured velocities in eight 10-cm cells at 1 Hz. Velocities measured by the PCADP are compared to those measured by an acoustic Doppler velocimeter for wave orbital velocities up to 95...
Authors
J.R. Lacy, C. Sherwood
Data files from the Grays Harbor Sediment Transport Experiment Spring 2001 Data files from the Grays Harbor Sediment Transport Experiment Spring 2001
This publication consists of two DVD-ROMs, both of which are presented here. This report describes data collected during the Spring 2001 Grays Harbor Sediment Transport Experiment, and provides additional information needed to interpret the data. Two DVDs accompany this report; both contain documentation in html format that assist the user in navigating through the data. DVD-ROM-1...
Authors
Laura Landerman, Christopher Sherwood, Guy Gelfenbaum, Jessica Lacy, Peter Ruggiero, Douglas Wilson, Tom Chisholm, Keith Kurrus
Interaction of lateral baroclinic forcing and turbulence in an estuary Interaction of lateral baroclinic forcing and turbulence in an estuary
Observations of density and velocity in a channel in northern San Francisco Bay show that the onset of vertical density stratification during flood tides is controlled by the balance between the cross-channel baroclinic pressure gradient and vertical mixing due to turbulence. Profiles of velocity, salinity, temperature, and suspended sediment concentration were measured in transects...
Authors
J.R. Lacy, M.T. Stacey, J.R. Burau, Stephen G. Monismith
Secondary currents in a curved, stratified, estuarine channel Secondary currents in a curved, stratified, estuarine channel
This paper presents a study of secondary circulation in a curved stratified channel in northern San Francisco Bay over a 12.5-hour tidal cycle. Secondary currents were strong at times (varying by up to 35 cm/s from top to bottom) but relatively transient, as the balance between centrifugal and lateral baroclinic forcing changed over time. The short travel time around the bend did not...
Authors
J.R. Lacy, Stephen G. Monismith
Recent research on the hydrodynamics of the Sacramento - San Joaquin River Delta and north San Francisco Bay Recent research on the hydrodynamics of the Sacramento - San Joaquin River Delta and north San Francisco Bay
This article presents an overview of recent findings from hydrodynamic research on circulation and mixing in the Sacramento-San Joaquin Delta (Delta) (Figure 1) and North San Francisco Bay (North Bay) (Figure 2). For the purposes of this article, North Bay includes San Pablo Bay, Carquinez Strait, and Suisun Bay. The findings presented are those gained from field studies carried out by...
Authors
Jon Burau, Stephen G. Monismith, Mark T. Stacey, Richard Oltmann, Jessica Lacy, David H. Schoellhamer
Suspended-solids flux at a shallow-water site in south San Francisco Bay, California Suspended-solids flux at a shallow-water site in south San Francisco Bay, California
Time series measurements of current velocity and suspended solids-concentration (SSC) made during December 1993 and March 1994 at a shallow-water site in South San Francisco Bay were used to estimate and compare suspended-solids flux during the two periods. In December, the average residual flux at the site was 2.88 g/m/s, to the northeast, whereas in March the average residual flux was...
Authors
Jessica Lacy, David H. Schoellhamer, Jon Burau
1994 Annual report: San Francisco Estuary regional monitoring program for trace substances 1994 Annual report: San Francisco Estuary regional monitoring program for trace substances
This is the second Annual Report of the Regional Monitoring Program for Trace Substances (RMP). It describes concentrations of pollutants in water, sediment, and tissue samples of oysters, mussels, and clams at 15 to 24 sampling locations for three discrete sampling events - during the wet season in February, in April during a period of declining Delta outflows, and during the dry season...
Authors
Bruce Thompson, Jay Davis, Margaret Johnston, E. Johnston, Jessica Lacy, Kimberly Taylor, John Hunt, Brian Anderson