Andy Ritchie
Geologist with the USGS Pacific Coastal and Marine Science Center
Science and Products
Chirp sub-bottom data of USGS field activity K0211PS collected in Puget Sound, Washington in April of 2011
Post-Hurricane Florence Aerial Imagery: Cape Fear to Duck, North Carolina, October 6-8, 2018
Ecological parameters in the Elwha River estuary before and during dam removal (ver. 2.0, August 2020)
SQUID-5 structure-from-motion point clouds, bathymetric maps, orthomosaics, and underwater photos of coral reefs in Florida, 2019
Topographic point clouds for the Mud Creek landslide, Big Sur, California from structure-from-motion photogrammetry from aerial photographs
Data in support of 5-year sediment budget and morphodynamic analysis of Elwha River following dam removals
California State Waters Map Series Data Catalog--Offshore of Monterey, California
California State Waters Map Series Data Catalog--Pigeon Point to Monterey, California
California State Waters Map Series Data Catalog--Monterey Canyon and Vicinity, California
California State Waters Map Series Data Catalog--Offshore of Aptos, California
California State Waters Map Series Data Catalog--Offshore of Santa Cruz, California
California State Waters Map Series Data Catalog--Offshore of Scott Creek, California
A regime shift in sediment export from a coastal watershed during a record wet winter, California: Implications for landscape response to hydroclimatic extremes
Morphodynamic evolution following sediment release from the world’s largest dam removal
Sediment pulses can cause widespread, complex changes to rivers and coastal regions. Quantifying landscape response to sediment-supply changes is a long-standing problem in geomorphology, but the unanticipated nature of most sediment pulses rarely allows for detailed measurement of associated landscape processes and evolution. The intentional removal of two large dams on the Elwha River (Washingto
California State Waters map series — Offshore of Pigeon Point, California
California State Waters map series — Offshore of Scott Creek, California
Southern Salish Sea Habitat Map Series: Admiralty Inlet
Large-scale dam removal on the Elwha River, Washington, USA: source-to-sink sediment budget and synthesis
Understanding landscape responses to sediment supply changes constitutes a fundamental part of many problems in geomorphology, but opportunities to study such processes at field scales are rare. The phased removal of two large dams on the Elwha River, Washington, exposed 21 ± 3 million m3, or ~ 30 million tonnes (t), of sediment that had been deposited in the two former reservoirs, allowing a comp
Sedimentology of new fluvial deposits on the Elwha River, Washington, USA, formed during large-scale dam removal
Hyperpycnal plume-derived fans in the Santa Barbara Channel, California
Bathymetry and acoustic backscatter-outer mainland shelf, eastern Santa Barbara Channel, California
Swath Bathymetry Surveys of the Monterey Bay Area from Point Ano Nuevo to Moss Landing, San Mateo, Santa Cruz, and Monterey Counties, California
Science and Products
- Science
- Data
Filter Total Items: 25
Chirp sub-bottom data of USGS field activity K0211PS collected in Puget Sound, Washington in April of 2011
High-resolution chirp sub-bottom data were collected by the U.S. Geological Survey in April 2011 south of Bainbridge Island and west of Seattle in Puget Sound, Washington. Data were collected aboard the R/V Karluk during field activity K0211PS using an Edgetech SB-512i sub-bottom profiler. Sub-bottom acoustic penetration spans several tens of meters and is variable by location.Post-Hurricane Florence Aerial Imagery: Cape Fear to Duck, North Carolina, October 6-8, 2018
The U.S. Geological Survey (USGS) Remote Sensing Coastal Change (RSCC) project collects aerial imagery along coastal swaths, in response to storm events, with optimized endlap/sidelap and precise position information to create high-resolution orthomosaics, three-dimensional (3D) point clouds, and digital elevation/surface models (DEMs/DSMs) using Structure-from-Motion (SfM) photogrammetry methods.Ecological parameters in the Elwha River estuary before and during dam removal (ver. 2.0, August 2020)
The Elwha and Glines Canyon dams were removed from the Elwha River in Washington State from 2011 to 2014. We collected data for a variety of metrics in the estuary and on the river delta before (2006-2011) and during (2012-2014) dam removal to assess how increased sediment transport and deposition affected habitats, vegetation, invertebrates, and fish.SQUID-5 structure-from-motion point clouds, bathymetric maps, orthomosaics, and underwater photos of coral reefs in Florida, 2019
The new structure-from-motion (SfM) quantitative underwater imaging device with five cameras (SQUID-5) was tested in July 2019 at Crocker Reef in the Florida Keys. The SQUID-5 was developed to meet the unique challenges of collecting SfM underwater imagery, including multiple cameras with different perspectives, accurate geographic locations of images, accurate and precise scaling of derived surfaTopographic point clouds for the Mud Creek landslide, Big Sur, California from structure-from-motion photogrammetry from aerial photographs
This data release contains structure-from-motion (SfM) point cloud data from aerial surveys conducted over the Mud Creek landslide on Big Sur from 1967-2018. Data sources include scanned aerial photographs, digital images collected from fixed wing aircraft, and digital images collected from multirotor UAS.Data in support of 5-year sediment budget and morphodynamic analysis of Elwha River following dam removals
Two large dams were removed from the Elwha River in Washington, starting in 2011 and ending in 2014. The Elwha and the Glines Canyon dams were located approximately 7 km and 20 km upstream, respectively, from the Elwha River's mouth on the Strait of Juan de Fuca. The dams trapped over 20 million cubic meters of sediment. Dam removal changed the river's sediment budget and water flow, which affecteCalifornia State Waters Map Series Data Catalog--Offshore of Monterey, California
Data catalog for California State Waters Map Series--Offshore of Santa Cruz, California.California State Waters Map Series Data Catalog--Pigeon Point to Monterey, California
Data catalog for California State Waters Map Series--Pigeon Point to Monterey, California.California State Waters Map Series Data Catalog--Monterey Canyon and Vicinity, California
Data Catalog for California State Waters, Monterey Canyon and Vicinity, CaliforniaCalifornia State Waters Map Series Data Catalog--Offshore of Aptos, California
Data catalog for California State Waters Map Series--Offshore of Aptos, California.California State Waters Map Series Data Catalog--Offshore of Santa Cruz, California
Data catalog for California State Waters Map Series--Offshore of Santa Cruz, California.California State Waters Map Series Data Catalog--Offshore of Scott Creek, California
Data catalog for California State Waters Map Series--Offshore of Scott Creek, California. - Maps
- Multimedia
- Publications
Filter Total Items: 22
A regime shift in sediment export from a coastal watershed during a record wet winter, California: Implications for landscape response to hydroclimatic extremes
Small, steep watersheds are prolific sediment sources from which sediment flux is highly sensitive to climatic changes. Storm intensity and frequency are widely expected to increase during the 21st century, and so assessing the response of small, steep watersheds to extreme rainfall is essential to understanding landscape response to climate change. During record winter rainfall in 2016–2017, theAuthorsAmy E. East, Andrew W. Stevens, Andrew C. Ritchie, Patrick L. Barnard, Pamela L. Campbell‐Swarzenski, Brian D. Collins, Christopher H. ConawayMorphodynamic evolution following sediment release from the world’s largest dam removal
Sediment pulses can cause widespread, complex changes to rivers and coastal regions. Quantifying landscape response to sediment-supply changes is a long-standing problem in geomorphology, but the unanticipated nature of most sediment pulses rarely allows for detailed measurement of associated landscape processes and evolution. The intentional removal of two large dams on the Elwha River (Washingto
AuthorsAndrew C. Ritchie, Jonathan Warrick, Amy E. East, Christopher S. Magirl, Andrew W. Stevens, Jennifer A. Bountry, Timothy J. Randle, Christopher A. Curran, Robert C. Hilldale, Jeffrey J. Duda, Ian M. Miller, George R. Pess, Emily Eidam, Melissa M. Foley, Randall McCoy, Andrea S. OgstonByEcosystems Mission Area, Natural Hazards Mission Area, Water Resources Mission Area, Coastal and Marine Hazards and Resources Program, Arizona Water Science Center, Pacific Coastal and Marine Science Center, Washington Water Science Center, Western Fisheries Research Center, Sediment Lab Suite and Carbon Analysis LaboratoryCalifornia State Waters map series — Offshore of Pigeon Point, California
Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly detailed seafloor maps through collection, integration, interpAuthorsGuy R. Cochrane, Janet Watt, Peter Dartnell, H. Gary Greene, Mercedes D. Erdey, Bryan E. Dieter, Nadine E. Golden, Samuel Y. Johnson, Charles A. Endris, Stephen R. Hartwell, Rikk G. Kvitek, Clifton W. Davenport, Lisa M. Krigsman, Andrew C. Ritchie, Ray W. Sliter, David P. Finlayson, Katherine L. MaierCalifornia State Waters map series — Offshore of Scott Creek, California
Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly detailed seafloor maps through collection, integration, interprAuthorsGuy R. Cochrane, Peter Dartnell, Samuel Y. Johnson, H. Gary Greene, Mercedes D. Erdey, Bryan E. Dieter, Nadine E. Golden, Charles A. Endris, Stephen R. Hartwell, Rikk G. Kvitek, Clifton W. Davenport, Janet Watt, Lisa M. Krigsman, Andrew C. Ritchie, Ray W. Sliter, David P. Finlayson, Katherine L. MaierSouthern Salish Sea Habitat Map Series: Admiralty Inlet
In 2010 the Environmental Protection Agency, Region 10 initiated the Puget Sound Scientific Studies and Technical Investigations Assistance Program, designed to support research in support of implementing the Puget Sound Action Agenda. The Action Agenda was created in response to Puget Sound having been designated as one of 28 estuaries of national significance under section 320 of the U.S. CleanAuthorsGuy R. Cochrane, Megan N. Dethier, Timothy O. Hodson, Kristine K. Kull, Nadine E. Golden, Andrew C. Ritchie, Crescent Moegling, Robert E. PacunskiLarge-scale dam removal on the Elwha River, Washington, USA: source-to-sink sediment budget and synthesis
Understanding landscape responses to sediment supply changes constitutes a fundamental part of many problems in geomorphology, but opportunities to study such processes at field scales are rare. The phased removal of two large dams on the Elwha River, Washington, exposed 21 ± 3 million m3, or ~ 30 million tonnes (t), of sediment that had been deposited in the two former reservoirs, allowing a comp
AuthorsJonathan A. Warrick, Jennifer A. Bountry, Amy E. East, Christopher S. Magirl, Timothy J. Randle, Guy R. Gelfenbaum, Andrew C. Ritchie, George R. Pess, Vivian Leung, Jeff J. DudaSedimentology of new fluvial deposits on the Elwha River, Washington, USA, formed during large-scale dam removal
Removal of two dams 32 m and 64 m high on the Elwha River, Washington, USA, provided the first opportunity to examine river response to a dam removal and controlled sediment influx on such a large scale. Although many recent river-restoration efforts have included dam removal, large dam removals have been rare enough that their physical and ecological effects remain poorly understood. New sedimentAuthorsAmy Draut, Andrew C. RitchieHyperpycnal plume-derived fans in the Santa Barbara Channel, California
Hyperpycnal gravity currents rapidly transport sediment across shore from rivers to the continental shelf and deep sea. Although these geophysical processes are important sediment dispersal mechanisms, few distinct geomorphic features on the continental shelf can be attributed to hyperpycnal flows. Here we provide evidence of large depositional features derived from hyperpycnal plumes on the contiAuthorsJonathan A. Warrick, Alexander R. Simms, Andy Ritchie, Elisabeth Steel, Pete Dartnell, James E. Conrad, David P. FinlaysonBathymetry and acoustic backscatter-outer mainland shelf, eastern Santa Barbara Channel, California
In 2010 and 2011, scientists from the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), acquired bathymetry and acoustic-backscatter data from the outer shelf region of the eastern Santa Barbara Channel, California. These surveys were conducted in cooperation with the Bureau of Ocean Energy Management (BOEM). BOEM is interested in maps of hard-bottom substrates, parAuthorsPeter Dartnell, David P. Finlayson, Andrew C. Ritchie, Guy R. Cochrane, Mercedes D. ErdeySwath Bathymetry Surveys of the Monterey Bay Area from Point Ano Nuevo to Moss Landing, San Mateo, Santa Cruz, and Monterey Counties, California
This report describes swath bathymetry and backscatter data acquired by the U.S. Geological Survey on the continental shelf within the Monterey Bay National Marine Sanctuary between Point Año Nuevo and Moss Landing, in San Mateo, Santa Cruz, and Monterey Counties, Calif. The survey was done for the California Seafloor Mapping Program (CSMP), in field activities S-7-09-MB and S-10-09-MB, by the WesAuthorsAndrew C. Ritchie, David P. Finlayson, Joshua B. Logan - Software
- News