Drag and sediment transport: conditions at the bottom boundary
Science Center Objects
This research is part of the project “Sediment Transport in Coastal Environments”
USGS physical scientist Cordell Johnson, at left, and USGS research oceanographer Jessie Lacy, both from the Pacific Coastal and Marine Science Center, guide a tripod with instruments into the waters of the Mokelumne River where it meets the San Joaquin River. The Mokelumne is part of the vast Sacramento-San Joaquin River Delta in California, located east of San Francisco Bay and south of Sacramento. Photo credit: John Koster, USGS.
Objectives:
Investigate the influence of seafloor properties, including bed sediment grain size, bedform morphology, and vegetation characteristics, on sediment resuspension and transport.
Develop parameterizations of the influence of seafloor properties on sediment transport for inclusion in numerical models.
Investigate the temporal variability of bed-sediment grain size on event and seasonal time scales, and investigate the response of bedform morphology to changes in bed sediment grain size.
Collaborate with Team members in collecting oceanographic and sediment transport data to advance understanding of coastal ecosystems and coastal hazards
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Date published: June 4, 2020Status: ActiveSediment Transport in Coastal Environments
Our research goals are to provide the scientific information, knowledge, and tools required to ensure that decisions about land and resource use, management practices, and future development in the coastal zone and adjacent watersheds can be evaluated with a complete understanding of the probable effects on coastal ecosystems and communities, and a full assessment of their vulnerability to...
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Date published: June 4, 2020Status: ActiveDrag and sediment transport: conditions at the bottom boundary
This research is part of the project “Sediment Transport in Coastal Environments”
Contacts: Jessie LacyAttribution: Pacific Coastal and Marine Science Center -
Date published: June 4, 2020Status: ActiveSan Francisco Bay geomorphology
This research is part of the project “Sediment Transport in Coastal Environments”
Contacts: Bruce JaffeAttribution: Pacific Coastal and Marine Science Center -
Date published: May 5, 2020Status: ActiveSediment transport between estuarine habitats in San Francisco Bay
This research is part of the project “Sediment Transport in Coastal Environments”
Attribution: Pacific Coastal and Marine Science Center -
Date published: December 9, 2019Status: ActiveSediment transport in submarine canyons
This research is part of the project “Sediment Transport in Coastal Environments”
Attribution: Pacific Coastal and Marine Science Center -
Date published: December 9, 2019Status: ActiveTransport of invasive microorganisms
This research is part of the project “Sediment Transport in Coastal Environments”
Contacts: Mary McGannAttribution: Pacific Coastal and Marine Science Center -
Date published: July 15, 2019Status: ActiveCoastal watershed and estuary restoration in the Monterey Bay area
This research is part of the project “Sediment Transport in Coastal Environments”
Contacts: Amy EastAttribution: Pacific Coastal and Marine Science Center -
Date published: July 15, 2019Status: ActiveColumbia River estuary
This research is part of the project “Sediment Transport in Coastal Environments”
Contacts: Guy GelfenbaumAttribution: Pacific Coastal and Marine Science Center -
Date published: December 6, 2018Status: CompletedEcosystem Engineers: Impacts of Invasive Aquatic Vegetation on the Delta’s Critical Ecosystems
The Sacramento-San Joaquin Delta (Delta) is home to a diverse community of plants and animals and is the hub of California’s freshwater delivery system. The Delta supplies water for over 25 million Californians and supports millions of acres of farming, commercial and sport fishing, shipping and ports, and recreational boating.
Contacts: Judith Z Drexler, Jessie Lacy, David Schoellhamer, Maureen Downing-Kunz, Paul Work, Ph.D., P.E., D.CE, Dr. Shruti Khanna
Bed shear stress estimation under wave conditions using near-bottom measurements: Comparison of methods
Understanding the influence of waves on bed shear stress is critical for predicting morphodynamical behaviours in coastal areas. Near-bed flow was measured on the middle and lower intertidal mudflats along the Jiangsu coast, China, using a three-dimensional acoustic velocimeter that collected a 3.5-cm vertical profile at 1mm resolution and sample...
Zhang, Qian; Gong, Zheng; Zhang, Changkuan; Lacy, Jessica R.; Jaffe, Bruce E.; Xu, Beibei
R/V Parke Snavely departs for deployment
The USGS research vessel Parke Snavely heads out of the Vallejo Marina on June 11, 2019 to deploy instrument frames in Grizzly Bay for the ERO19 study.
Tripod preparation for ERO19
Lukas Winkler-Prins checks on the frame setup on June 10, 2019. This tripod has an RBR CTD, an RBR bursting pressure sensor, an RBR optical backscatter sensor, a LISST-200X, an altimeter, and two Nortek ADVs + Seapoint optical backscatter sensors, which will reveal information about water temperature and salinity, wave height and period, total suspended sediment
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Date published: August 31, 2018Are Invasive Plants Trapping the Sediment that a Healthy Estuary Needs? Sweating the Small Stuff in California’s Sacramento-San Joaquin River Delta
In recent years, invasive aquatic plants have increased exponentially in the shallow waters of California’s Sacramento-San Joaquin River Delta, clogging about 17,400 acres (nearly 30 square miles) of the waterways. Among the plants’ many effects are changes in the way mud and sand move through the region.