Jessie Lacy (Former Employee)
Science and Products
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The influence of current speed and vegetation density on flow structure in two macrotidal eelgrass canopies The influence of current speed and vegetation density on flow structure in two macrotidal eelgrass canopies
The influence of eelgrass (Zostera marina) on near-bed currents, turbulence, and drag was investigated at three sites in two eelgrass canopies of differing density and at one unvegetated site in the San Juan archipelago of Puget Sound, Washington, USA. Eelgrass blade length exceeded 1 m. Velocity profiles up to 1.5 m above the sea floor were collected over a spring-neap tidal cycle with...
Authors
Jessica R. Lacy, Sandy Wyllie-Echeverria
Wind-enhanced resuspension in the shallow waters of South San Francisco Bay: Mechanisms and potential implications for cohesive sediment transport Wind-enhanced resuspension in the shallow waters of South San Francisco Bay: Mechanisms and potential implications for cohesive sediment transport
We investigated the driving forces of sediment dynamics at the shoals in South San Francisco Bay. Two stations were deployed along a line perpendicular to a 14 m deep channel, 1000 and 2000 m from the middle of the channel. Station depths were 2.59 and 2.19 m below mean lower low water, respectively. We used acoustic Doppler velocimeters for the simultaneous determination of current...
Authors
Andreas Brand, Jessica R. Lacy, Kevin Hsu, Daniel Hoover, Steve Gladding, Mark T. Stacey
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 R. Lacy, David P. 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 M. Hanes, Li H. Erikson, Jamie M.R. Lescinski, Jodi N. Harney, Carissa L. Carter, Gerry A. Hatcher, Jessica R. Lacy, David M. 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 R. Lacy, David M. Rubin, Hiroshi Ikeda, Kuniyasu Mokudai, Daniel M. 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. R. Sherwood, J.R. Lacy, G. Voulgaris
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Science and Products
Filter Total Items: 16
No Result Found
Filter Total Items: 51
The influence of current speed and vegetation density on flow structure in two macrotidal eelgrass canopies The influence of current speed and vegetation density on flow structure in two macrotidal eelgrass canopies
The influence of eelgrass (Zostera marina) on near-bed currents, turbulence, and drag was investigated at three sites in two eelgrass canopies of differing density and at one unvegetated site in the San Juan archipelago of Puget Sound, Washington, USA. Eelgrass blade length exceeded 1 m. Velocity profiles up to 1.5 m above the sea floor were collected over a spring-neap tidal cycle with...
Authors
Jessica R. Lacy, Sandy Wyllie-Echeverria
Wind-enhanced resuspension in the shallow waters of South San Francisco Bay: Mechanisms and potential implications for cohesive sediment transport Wind-enhanced resuspension in the shallow waters of South San Francisco Bay: Mechanisms and potential implications for cohesive sediment transport
We investigated the driving forces of sediment dynamics at the shoals in South San Francisco Bay. Two stations were deployed along a line perpendicular to a 14 m deep channel, 1000 and 2000 m from the middle of the channel. Station depths were 2.59 and 2.19 m below mean lower low water, respectively. We used acoustic Doppler velocimeters for the simultaneous determination of current...
Authors
Andreas Brand, Jessica R. Lacy, Kevin Hsu, Daniel Hoover, Steve Gladding, Mark T. Stacey
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 R. Lacy, David P. 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 M. Hanes, Li H. Erikson, Jamie M.R. Lescinski, Jodi N. Harney, Carissa L. Carter, Gerry A. Hatcher, Jessica R. Lacy, David M. 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 R. Lacy, David M. Rubin, Hiroshi Ikeda, Kuniyasu Mokudai, Daniel M. 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. R. Sherwood, J.R. Lacy, G. Voulgaris
Filter Total Items: 13