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
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