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
Filter Total Items: 16
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The influence of wave energy and sediment transport on seagrass distribution The influence of wave energy and sediment transport on seagrass distribution
A coupled hydrodynamic and sediment transport model (Delft3D) was used to simulate the water levels, waves, and currents associated with a seagrass (Zostera marina) landscape along a 4-km stretch of coast in Puget Sound, WA, USA. A hydroacoustic survey of seagrass percent cover and nearshore bathymetry was conducted, and sediment grain size was sampled at 53 locations. Wave energy is a...
Authors
Andrew Stevens, Jessica Lacy
Wave exposure of Corte Madera Marsh, Marin County, California: A field investigation Wave exposure of Corte Madera Marsh, Marin County, California: A field investigation
Tidal wetlands provide valuable habitat, are an important source of primary productivity, and can help to protect the shoreline from erosion by attenuating approaching waves. These functions are threatened by the loss of tidal marshes, whether due to erosion, sea-level rise, or land-use practices. Erosion protection by wetlands is expected to vary geographically, because wave attenuation...
Authors
Jessica Lacy, Daniel Hoover
The dynamics of fine-grain sediment dredged from Santa Cruz Harbor The dynamics of fine-grain sediment dredged from Santa Cruz Harbor
In the fall and early winter of 2009, a demonstration project was done at Santa Cruz Harbor, California, to determine if 450 m3/day of predominantly (71 percent) mud-sized sediment could be dredged from the inner portion of the harbor and discharged to the coastal ocean without significant impacts to the beach and inner shelf. During the project, more than 7600 m3 of sediment (~5400 m3...
Authors
Curt D. Storlazzi, Christopher H. Conaway, M. Katherine Presto, Joshua B. Logan, Katherine Cronin, Maarten van Ormondt, Jamie Lescinski, E. Harden, Jessica Lacy, Pieter Tonnon
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 Lacy, Sandy Wyllie-Echeverria
An inexpensive instrument for measuring wave exposure and water velocity An inexpensive instrument for measuring wave exposure and water velocity
Ocean waves drive a wide variety of nearshore physical processes, structuring entire ecosystems through their direct and indirect effects on the settlement, behavior, and survivorship of marine organisms. However, wave exposure remains difficult and expensive to measure. Here, we report on an inexpensive and easily constructed instrument for measuring wave-induced water velocities. The...
Authors
J.D. Figurski, D. Malone, J.R. Lacy, M. Denny
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 Lacy, Kevin Hsu, Daniel Hoover, Steve Gladding, Mark T. Stacey
Science and Products
Filter Total Items: 16
No Result Found
Filter Total Items: 49
The influence of wave energy and sediment transport on seagrass distribution The influence of wave energy and sediment transport on seagrass distribution
A coupled hydrodynamic and sediment transport model (Delft3D) was used to simulate the water levels, waves, and currents associated with a seagrass (Zostera marina) landscape along a 4-km stretch of coast in Puget Sound, WA, USA. A hydroacoustic survey of seagrass percent cover and nearshore bathymetry was conducted, and sediment grain size was sampled at 53 locations. Wave energy is a...
Authors
Andrew Stevens, Jessica Lacy
Wave exposure of Corte Madera Marsh, Marin County, California: A field investigation Wave exposure of Corte Madera Marsh, Marin County, California: A field investigation
Tidal wetlands provide valuable habitat, are an important source of primary productivity, and can help to protect the shoreline from erosion by attenuating approaching waves. These functions are threatened by the loss of tidal marshes, whether due to erosion, sea-level rise, or land-use practices. Erosion protection by wetlands is expected to vary geographically, because wave attenuation...
Authors
Jessica Lacy, Daniel Hoover
The dynamics of fine-grain sediment dredged from Santa Cruz Harbor The dynamics of fine-grain sediment dredged from Santa Cruz Harbor
In the fall and early winter of 2009, a demonstration project was done at Santa Cruz Harbor, California, to determine if 450 m3/day of predominantly (71 percent) mud-sized sediment could be dredged from the inner portion of the harbor and discharged to the coastal ocean without significant impacts to the beach and inner shelf. During the project, more than 7600 m3 of sediment (~5400 m3...
Authors
Curt D. Storlazzi, Christopher H. Conaway, M. Katherine Presto, Joshua B. Logan, Katherine Cronin, Maarten van Ormondt, Jamie Lescinski, E. Harden, Jessica Lacy, Pieter Tonnon
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 Lacy, Sandy Wyllie-Echeverria
An inexpensive instrument for measuring wave exposure and water velocity An inexpensive instrument for measuring wave exposure and water velocity
Ocean waves drive a wide variety of nearshore physical processes, structuring entire ecosystems through their direct and indirect effects on the settlement, behavior, and survivorship of marine organisms. However, wave exposure remains difficult and expensive to measure. Here, we report on an inexpensive and easily constructed instrument for measuring wave-induced water velocities. The...
Authors
J.D. Figurski, D. Malone, J.R. Lacy, M. Denny
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 Lacy, Kevin Hsu, Daniel Hoover, Steve Gladding, Mark T. Stacey