Picture of surveyor equipped with survey equipment during mapping mission
Picture of surveyor equipped with survey equipment during mapping missionPicture of surveyor equipped with survey equipment during mapping mission of the Elwha River mouth.
Andrew Stevens
Oceanographer with the USGS Pacific Coastal and Marine Science Center
Explore my published data sets on USGS ScienceBase, or choose the Data and Tools tab below.
Science and Products
Sediment 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 natural...
Estuaries and large river deltas in the Pacific Northwest
Essential habitat for wild salmon and other wildlife borders river deltas and estuaries in the Pacific Northwest. These estuaries also support industry, agriculture, and a large human population that’s expected to double by the year 2060, but each could suffer from more severe river floods, higher sea level, and storm surges caused by climate change.
Filter Total Items: 49
Picture of surveyor equipped with survey equipment during mapping mission
Picture of surveyor equipped with survey equipment during mapping mission
Picture of surveyor equipped with survey equipment during mapping missionPicture of surveyor equipped with survey equipment during mapping mission of the Elwha River mouth.
Photo showing personal watercraft equipped with survey equipment used during the mapping mission
Photo showing personal watercraft equipped with survey equipment used during the mapping missionPhoto showing personal watercraft equipped with survey equipment used during the mapping mission at the Elwha River mouth.
Photo showing personal watercraft equipped with survey equipment used during the mapping mission
Photo showing personal watercraft equipped with survey equipment used during the mapping missionPhoto showing personal watercraft equipped with survey equipment used during the mapping mission at the Elwha River mouth.
Collecting topographic data on an all-terrain vehicle
Collecting topographic data on an all-terrain vehicleDiana McCandless, an environmental specialist with the Washington State Department of Ecology, collecting topographic data on an all-terrain vehicle.
Collecting topographic data on an all-terrain vehicle
Collecting topographic data on an all-terrain vehicleDiana McCandless, an environmental specialist with the Washington State Department of Ecology, collecting topographic data on an all-terrain vehicle.
Topographic survey at the base of an eroding dune
USGS Oceanographer Andrew Stevens performing a topographic survey at the base of an eroding dune.
USGS Oceanographer Andrew Stevens performing a topographic survey at the base of an eroding dune.
Launching a personal water craft into the surf zone during bathymetric surveys
Launching a personal water craft into the surf zone during bathymetric surveysPersonnel from Oregon State University launch a personal water craft into the surf zone during bathymetric surveys along the Washington coast.
Launching a personal water craft into the surf zone during bathymetric surveys
Launching a personal water craft into the surf zone during bathymetric surveysPersonnel from Oregon State University launch a personal water craft into the surf zone during bathymetric surveys along the Washington coast.
Topographic beach survey at dawn
Paige Hovenga, former Graduate Research Assistant at Oregon State University, participating in a dawn topographic survey.
Paige Hovenga, former Graduate Research Assistant at Oregon State University, participating in a dawn topographic survey.
Navigating the surf zone on a personal watercraft during a bathymetric survey
Navigating the surf zone on a personal watercraft during a bathymetric surveyKai Parker, USGS Oceanographer, navigates the surf zone on a personal watercraft during a bathymetric survey.
Navigating the surf zone on a personal watercraft during a bathymetric survey
Navigating the surf zone on a personal watercraft during a bathymetric surveyKai Parker, USGS Oceanographer, navigates the surf zone on a personal watercraft during a bathymetric survey.
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marshPCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh in Eden Landing Ecological Reserve, Hayward, CA, with birds foraging on the South San Francisco Bay mudflats at low tide in the background.
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marshPCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh in Eden Landing Ecological Reserve, Hayward, CA, with birds foraging on the South San Francisco Bay mudflats at low tide in the background.
Map of model bathymetry, Columbia River
A three-dimensional hydrodynamic model of the lower Columbia River (LCR) was constructed using the Delft3D Flexible Mesh (DFM) modeling suite to simulate water levels, flow, and seabed stresses between January 1, 2017, and April 20, 2020
A three-dimensional hydrodynamic model of the lower Columbia River (LCR) was constructed using the Delft3D Flexible Mesh (DFM) modeling suite to simulate water levels, flow, and seabed stresses between January 1, 2017, and April 20, 2020
Portable single-beam echo sounder set-up
Marine engineering technician Pete Dal Ferro sets up a newly acquired, portable, single-beam echo sounder on the San Lorenzo River in Santa Cruz, California. The new device, called CEESCOPE, collects bathymetric (depth) data and also records features of the subsurface.
Marine engineering technician Pete Dal Ferro sets up a newly acquired, portable, single-beam echo sounder on the San Lorenzo River in Santa Cruz, California. The new device, called CEESCOPE, collects bathymetric (depth) data and also records features of the subsurface.
Taking PPE to a whole new level
You have to be able to have a little fun when in the field. A colleague from the Washington State Department of Ecology hams it up while prepping for a beach survey with scientists from the USGS Pacific Coastal and Marine Science Center.
You have to be able to have a little fun when in the field. A colleague from the Washington State Department of Ecology hams it up while prepping for a beach survey with scientists from the USGS Pacific Coastal and Marine Science Center.
Installing weather station in Grizzly Bay
Pete Dal Ferro and Andrew Stevens, both from the USGS Pacific Coastal and Marine Science Center (PCMSC) in Santa Cruz, California, install a Vaisala WXT weather station in Grizzly Bay, east of San Pablo Bay and northeast of San Francisco.
Pete Dal Ferro and Andrew Stevens, both from the USGS Pacific Coastal and Marine Science Center (PCMSC) in Santa Cruz, California, install a Vaisala WXT weather station in Grizzly Bay, east of San Pablo Bay and northeast of San Francisco.
Preparing the GOMEX on Grizzly Bay
From left to right, USGS scientists Sam McGill, Lucas WinklerPrins, David Hart, Selina Davila Olivera, and Pete Dal Ferro work on Grizzly Bay on the vessel Jewell, to collect sediment samples using the GOMEX box corer.
From left to right, USGS scientists Sam McGill, Lucas WinklerPrins, David Hart, Selina Davila Olivera, and Pete Dal Ferro work on Grizzly Bay on the vessel Jewell, to collect sediment samples using the GOMEX box corer.
Evolution of shoreline around Elwha River mouth
Evolution of the shoreline around the Elwha River mouth, Washington, before, during and after dam removal, 2011–2017. Two large dams were removed from the Elwha River between 2011 and 2014 in the largest dam removal worldwide thus far, releasing more than 20 million tons of sediment downstream.
Evolution of the shoreline around the Elwha River mouth, Washington, before, during and after dam removal, 2011–2017. Two large dams were removed from the Elwha River between 2011 and 2014 in the largest dam removal worldwide thus far, releasing more than 20 million tons of sediment downstream.
Field work in the Columbia River Littoral Cell
Photographs showing equipment used during bathymetric and topographic surveys along the Columbia River littoral cell, Washington and Oregon.
Photographs showing equipment used during bathymetric and topographic surveys along the Columbia River littoral cell, Washington and Oregon.
Mapping nearshore depths along a beach
Cordell Johnson uses a personal watercraft (PWC) equipped with GPS and sonar to measure seafloor depths near the beach.
Cordell Johnson uses a personal watercraft (PWC) equipped with GPS and sonar to measure seafloor depths near the beach.
Measuring dune elevations
Dan Nowacki measures dune elevations near the mouth of the Pajaro River with a precision GPS unit carried in his backpack.
Dan Nowacki measures dune elevations near the mouth of the Pajaro River with a precision GPS unit carried in his backpack.
Equipped and ready to collect data
USGS oceanographer Andrew Stevens, of the Pacific Coastal and Marine Science Center in Santa Cruz, California, sits on an all-terrain vehicle equipped with a precision GPS and other instruments. The GPS collects position data continuously, about 2 points per second, while an operator like Andrew drives the ATV over a beach.
USGS oceanographer Andrew Stevens, of the Pacific Coastal and Marine Science Center in Santa Cruz, California, sits on an all-terrain vehicle equipped with a precision GPS and other instruments. The GPS collects position data continuously, about 2 points per second, while an operator like Andrew drives the ATV over a beach.
Beach survey on personal watercraft
Two personal watercraft operators from the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California, navigate their personal watercraft (PWC) in the shallow nearshore region in Moss Landing near Elkhorn Slough. The PWCs are set up with precision GPS and echosounder systems in order to create detailed bathymetric maps (depth).
Two personal watercraft operators from the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California, navigate their personal watercraft (PWC) in the shallow nearshore region in Moss Landing near Elkhorn Slough. The PWCs are set up with precision GPS and echosounder systems in order to create detailed bathymetric maps (depth).
Elwha River delta mapping
Diana McCandless of the Washington State Department of Ecology pauses for a moment, on the beach around the point and to the east of the mouth of Elwha River. McCandless is part of a team of scientists from WA State and the USGS who are periodically mapping the delta and beach areas near the mouth of the Elwha River.
Diana McCandless of the Washington State Department of Ecology pauses for a moment, on the beach around the point and to the east of the mouth of Elwha River. McCandless is part of a team of scientists from WA State and the USGS who are periodically mapping the delta and beach areas near the mouth of the Elwha River.
Synchronized mapping
USGS and Washington State Department of Ecology scientists are geared up and ready to start a topographic survey at the mouth of the Elwha River, using handheld computers and backpack-mounted GPS equipment. From left to right are Owen Warrick (USGS Volunteer), Jon Warrick (USGS), Andy Ritchie (USGS), Heather Weiner (WA State Dept.
USGS and Washington State Department of Ecology scientists are geared up and ready to start a topographic survey at the mouth of the Elwha River, using handheld computers and backpack-mounted GPS equipment. From left to right are Owen Warrick (USGS Volunteer), Jon Warrick (USGS), Andy Ritchie (USGS), Heather Weiner (WA State Dept.
Science and Products
Sediment 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 natural...
Estuaries and large river deltas in the Pacific Northwest
Essential habitat for wild salmon and other wildlife borders river deltas and estuaries in the Pacific Northwest. These estuaries also support industry, agriculture, and a large human population that’s expected to double by the year 2060, but each could suffer from more severe river floods, higher sea level, and storm surges caused by climate change.
Filter Total Items: 49
Picture of surveyor equipped with survey equipment during mapping mission
Picture of surveyor equipped with survey equipment during mapping missionPicture of surveyor equipped with survey equipment during mapping mission of the Elwha River mouth.
Picture of surveyor equipped with survey equipment during mapping mission
Picture of surveyor equipped with survey equipment during mapping missionPicture of surveyor equipped with survey equipment during mapping mission of the Elwha River mouth.
Photo showing personal watercraft equipped with survey equipment used during the mapping mission
Photo showing personal watercraft equipped with survey equipment used during the mapping missionPhoto showing personal watercraft equipped with survey equipment used during the mapping mission at the Elwha River mouth.
Photo showing personal watercraft equipped with survey equipment used during the mapping mission
Photo showing personal watercraft equipped with survey equipment used during the mapping missionPhoto showing personal watercraft equipped with survey equipment used during the mapping mission at the Elwha River mouth.
Collecting topographic data on an all-terrain vehicle
Collecting topographic data on an all-terrain vehicleDiana McCandless, an environmental specialist with the Washington State Department of Ecology, collecting topographic data on an all-terrain vehicle.
Collecting topographic data on an all-terrain vehicle
Collecting topographic data on an all-terrain vehicleDiana McCandless, an environmental specialist with the Washington State Department of Ecology, collecting topographic data on an all-terrain vehicle.
Topographic survey at the base of an eroding dune
USGS Oceanographer Andrew Stevens performing a topographic survey at the base of an eroding dune.
USGS Oceanographer Andrew Stevens performing a topographic survey at the base of an eroding dune.
Launching a personal water craft into the surf zone during bathymetric surveys
Launching a personal water craft into the surf zone during bathymetric surveysPersonnel from Oregon State University launch a personal water craft into the surf zone during bathymetric surveys along the Washington coast.
Launching a personal water craft into the surf zone during bathymetric surveys
Launching a personal water craft into the surf zone during bathymetric surveysPersonnel from Oregon State University launch a personal water craft into the surf zone during bathymetric surveys along the Washington coast.
Topographic beach survey at dawn
Paige Hovenga, former Graduate Research Assistant at Oregon State University, participating in a dawn topographic survey.
Paige Hovenga, former Graduate Research Assistant at Oregon State University, participating in a dawn topographic survey.
Navigating the surf zone on a personal watercraft during a bathymetric survey
Navigating the surf zone on a personal watercraft during a bathymetric surveyKai Parker, USGS Oceanographer, navigates the surf zone on a personal watercraft during a bathymetric survey.
Navigating the surf zone on a personal watercraft during a bathymetric survey
Navigating the surf zone on a personal watercraft during a bathymetric surveyKai Parker, USGS Oceanographer, navigates the surf zone on a personal watercraft during a bathymetric survey.
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marshPCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh in Eden Landing Ecological Reserve, Hayward, CA, with birds foraging on the South San Francisco Bay mudflats at low tide in the background.
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh
PCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marshPCMSC scientist measuring land-surface elevation near the bay-marsh edge of Whale's Tail South marsh in Eden Landing Ecological Reserve, Hayward, CA, with birds foraging on the South San Francisco Bay mudflats at low tide in the background.
Map of model bathymetry, Columbia River
A three-dimensional hydrodynamic model of the lower Columbia River (LCR) was constructed using the Delft3D Flexible Mesh (DFM) modeling suite to simulate water levels, flow, and seabed stresses between January 1, 2017, and April 20, 2020
A three-dimensional hydrodynamic model of the lower Columbia River (LCR) was constructed using the Delft3D Flexible Mesh (DFM) modeling suite to simulate water levels, flow, and seabed stresses between January 1, 2017, and April 20, 2020
Portable single-beam echo sounder set-up
Marine engineering technician Pete Dal Ferro sets up a newly acquired, portable, single-beam echo sounder on the San Lorenzo River in Santa Cruz, California. The new device, called CEESCOPE, collects bathymetric (depth) data and also records features of the subsurface.
Marine engineering technician Pete Dal Ferro sets up a newly acquired, portable, single-beam echo sounder on the San Lorenzo River in Santa Cruz, California. The new device, called CEESCOPE, collects bathymetric (depth) data and also records features of the subsurface.
Taking PPE to a whole new level
You have to be able to have a little fun when in the field. A colleague from the Washington State Department of Ecology hams it up while prepping for a beach survey with scientists from the USGS Pacific Coastal and Marine Science Center.
You have to be able to have a little fun when in the field. A colleague from the Washington State Department of Ecology hams it up while prepping for a beach survey with scientists from the USGS Pacific Coastal and Marine Science Center.
Installing weather station in Grizzly Bay
Pete Dal Ferro and Andrew Stevens, both from the USGS Pacific Coastal and Marine Science Center (PCMSC) in Santa Cruz, California, install a Vaisala WXT weather station in Grizzly Bay, east of San Pablo Bay and northeast of San Francisco.
Pete Dal Ferro and Andrew Stevens, both from the USGS Pacific Coastal and Marine Science Center (PCMSC) in Santa Cruz, California, install a Vaisala WXT weather station in Grizzly Bay, east of San Pablo Bay and northeast of San Francisco.
Preparing the GOMEX on Grizzly Bay
From left to right, USGS scientists Sam McGill, Lucas WinklerPrins, David Hart, Selina Davila Olivera, and Pete Dal Ferro work on Grizzly Bay on the vessel Jewell, to collect sediment samples using the GOMEX box corer.
From left to right, USGS scientists Sam McGill, Lucas WinklerPrins, David Hart, Selina Davila Olivera, and Pete Dal Ferro work on Grizzly Bay on the vessel Jewell, to collect sediment samples using the GOMEX box corer.
Evolution of shoreline around Elwha River mouth
Evolution of the shoreline around the Elwha River mouth, Washington, before, during and after dam removal, 2011–2017. Two large dams were removed from the Elwha River between 2011 and 2014 in the largest dam removal worldwide thus far, releasing more than 20 million tons of sediment downstream.
Evolution of the shoreline around the Elwha River mouth, Washington, before, during and after dam removal, 2011–2017. Two large dams were removed from the Elwha River between 2011 and 2014 in the largest dam removal worldwide thus far, releasing more than 20 million tons of sediment downstream.
Field work in the Columbia River Littoral Cell
Photographs showing equipment used during bathymetric and topographic surveys along the Columbia River littoral cell, Washington and Oregon.
Photographs showing equipment used during bathymetric and topographic surveys along the Columbia River littoral cell, Washington and Oregon.
Mapping nearshore depths along a beach
Cordell Johnson uses a personal watercraft (PWC) equipped with GPS and sonar to measure seafloor depths near the beach.
Cordell Johnson uses a personal watercraft (PWC) equipped with GPS and sonar to measure seafloor depths near the beach.
Measuring dune elevations
Dan Nowacki measures dune elevations near the mouth of the Pajaro River with a precision GPS unit carried in his backpack.
Dan Nowacki measures dune elevations near the mouth of the Pajaro River with a precision GPS unit carried in his backpack.
Equipped and ready to collect data
USGS oceanographer Andrew Stevens, of the Pacific Coastal and Marine Science Center in Santa Cruz, California, sits on an all-terrain vehicle equipped with a precision GPS and other instruments. The GPS collects position data continuously, about 2 points per second, while an operator like Andrew drives the ATV over a beach.
USGS oceanographer Andrew Stevens, of the Pacific Coastal and Marine Science Center in Santa Cruz, California, sits on an all-terrain vehicle equipped with a precision GPS and other instruments. The GPS collects position data continuously, about 2 points per second, while an operator like Andrew drives the ATV over a beach.
Beach survey on personal watercraft
Two personal watercraft operators from the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California, navigate their personal watercraft (PWC) in the shallow nearshore region in Moss Landing near Elkhorn Slough. The PWCs are set up with precision GPS and echosounder systems in order to create detailed bathymetric maps (depth).
Two personal watercraft operators from the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California, navigate their personal watercraft (PWC) in the shallow nearshore region in Moss Landing near Elkhorn Slough. The PWCs are set up with precision GPS and echosounder systems in order to create detailed bathymetric maps (depth).
Elwha River delta mapping
Diana McCandless of the Washington State Department of Ecology pauses for a moment, on the beach around the point and to the east of the mouth of Elwha River. McCandless is part of a team of scientists from WA State and the USGS who are periodically mapping the delta and beach areas near the mouth of the Elwha River.
Diana McCandless of the Washington State Department of Ecology pauses for a moment, on the beach around the point and to the east of the mouth of Elwha River. McCandless is part of a team of scientists from WA State and the USGS who are periodically mapping the delta and beach areas near the mouth of the Elwha River.
Synchronized mapping
USGS and Washington State Department of Ecology scientists are geared up and ready to start a topographic survey at the mouth of the Elwha River, using handheld computers and backpack-mounted GPS equipment. From left to right are Owen Warrick (USGS Volunteer), Jon Warrick (USGS), Andy Ritchie (USGS), Heather Weiner (WA State Dept.
USGS and Washington State Department of Ecology scientists are geared up and ready to start a topographic survey at the mouth of the Elwha River, using handheld computers and backpack-mounted GPS equipment. From left to right are Owen Warrick (USGS Volunteer), Jon Warrick (USGS), Andy Ritchie (USGS), Heather Weiner (WA State Dept.