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Scientific reports, journal articles, and information products produced by USGS Pacific Coastal and Marine Science Center scientists.
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Filter Total Items: 1337
The occurrence of the invasive foraminifera Trochammina hadai Uchio in Flamengo Inlet, Ubatuba, São Paulo State, Brazil
The agglutinated foraminifera Trochammina hadai Uchio (1962), a dominant species in Japan, first appeared as an invasive species in San Francisco Bay, US, in 1983. Trochammina hadai's first appearance in the Brazilian coastal waters of Flamengo Inlet, Ubatuba, Sao Paulo State, is recorded nearly three decades later, in two of thirty-four sediment samples collected in the western portion known as "
Authors
Patricia P. B. Eichler, Mary McGann, Andre R. Rodrigues, Alison Mendonca, Audrey Amorim, Carla Bonetti, Cristiane Cordeito de Farias, Silvia H. Mello e Sousa, Helenice Vital, Moab Praxedes Gomes
On the contribution of waves to total coastal water level changes in the context of sea level rise: a response to Melet, et al. (2018)
Response to Melet, A., Meyssignac, B., Almar, R. & Le Cozannet, G. Under-estimated wave contribution to coastal sea-level rise. Nat. Clim. Change 8, 234–239 (2018).
In a recent paper, Melet et al.1 claim that the contribution of wind-waves to coastal sea-level rise has been under-estimated. Although we agree with the overall premise that coastal wind-wave dynamics are important when assessing the
Authors
Jerome Aucan, Ron Hoeke, Curt D. Storlazzi, Justin Stopa, Moritz Wandres, Ryan J. Lowe
Storm surge propagation and flooding in small tidal rivers during events of mixed coastal and fluvial influence
The highly urbanized estuary of San Francisco Bay is an excellent example of a location susceptible to flooding from both coastal and fluvial influences. As part of developing a forecast model that integrates fluvial and oceanic drivers, a case study of the Napa River and its interactions with the San Francisco Bay was performed. For this application we utilize Delft3D-FM, a hydrodynamic model tha
Authors
Liv M. Herdman, Li H. Erikson, Patrick L. Barnard
A 50-year Sr/Ca time series from an enclosed, shallow-water Guam coral: In situ monitoring and extraction of a temperature trend, annual cycle, and ENSO and PDO signals
Located on the northern edge of the West Pacific Warm Pool and having a developed economy and modern infrastructure, Guam is well positioned and equipped for obtaining natural records of the west Pacific maritime paleoclimate. This study was a proof of concept to explore whether useful climate proxy records might be obtained from coral at readily accessible, even if geochemically nonoptimal, coast
Authors
Tomoko Bell, Mark Lander, John Jenson, Richard Randall, Judson W. Partin, Nancy G. Prouty
Building back bigger in hurricane strike zones
Despite decades of regulatory efforts in the United States to decrease vulnerability in developed coastal zones, exposure of residential assets to hurricane damage is increasing — even in places where hurricanes have struck before. Comparing plan-view footprints of individual residential buildings before and long after major hurricane strikes, we find a systematic pattern of ‘building back bigger’
Authors
Eli D. Lazarus, Patrick W. Limber, Evan B. Goldstein, Rosie Dodd, Scott B. Armstrong
Geomorphic evolution of a gravel‐bed river under sediment‐starved vs. sediment‐rich conditions: River response to the world's largest dam removal
Understanding river response to sediment pulses is a fundamental problem in geomorphic process studies, with myriad implications for river management. However, because large sediment pulses are rare and usually unanticipated, they are seldom studied at field scale. We examine fluvial response to a massive (~20 Mt) sediment pulse released by the largest dam removal globally, on the Elwha River, Was
Authors
Amy E. East, Joshua B. Logan, Mark C. Mastin, Andrew C. Ritchie, Jennifer A. Bountry, Christopher S. Magirl, Joel B. Sankey
Characteristic earthquake magnitude frequency distributions on faults calculated from consensus data in California
An estimate of the expected earthquake rate at all possible magnitudes is needed for seismic hazard forecasts. Regional earthquake magnitude frequency distributions obey a negative exponential law (Gutenberg‐Richter), but it's unclear if individual faults do. We add three new methods to calculate long‐term California earthquake rupture rates to the existing Uniform California Earthquake Rupture Fo
Authors
Thomas E. Parsons, Eric L. Geist, Rodolfo Console, Roberto Carluccio
Currents, waves and sediment transport around the headland of Pt. Dume, California
Sediment transport past rocky headlands has received less attention compared to transport along beaches. Here we explore, in a field-based study, possible pathways for sediment movement adjacent to Point Dume, a headland in Santa Monica Bay, California. This prominent shoreline feature is a nearly symmetrical, triangular-shaped promontory interior to the Santa Monica Littoral Cell. We collected cu
Authors
Douglas A. George, John L. Largier, Curt D. Storlazzi, Matthew J. Robart, Brian Gaylord
Identification of storm events and contiguous coastal sections for deterministic modeling of extreme coastal flood events in response to climate change
Deterministic dynamical modeling of future climate conditions and associated hazards, such as flooding, can be computationally-expensive if century-long time-series of waves, sea level variations, and overland flow patterns are simulated. To alleviate some of the computational costs, local impacts of individual coastal storms can be explored by first identifying particular events or scenarios of i
Authors
Li H. Erikson, Antonio Espejo, Patrick L. Barnard, Katherine A. Serafin, Christie Hegermiller, Andrea C. O'Neill, Peter Ruggerio, Patrick W. Limber, Fernando J. Mendez
Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic Margin
The Cape Fear Slide is one of the largest (>25 000 km3) submarine slope failure complexes on the US Atlantic margin. Here we use a combination of new high-resolution multichannel seismic data (MCS) from the National Science Foundation Geodynamic Processes at Rifting and Subducting Margins (NSF GeoPRISMS) Community Seismic Experiment and legacy industry MCS to derive detailed stratigraphy of this s
Authors
Jenna C. Hill, Daniel S. Brothers, Matthew J. Hornbach, Derek E. Sawyer, Donna J. Shillington, Anne Bécel
Inhibition of grain boundary sliding creep in fine-grained ice by inter-granular particles: Implications for planetary ice masses
Ice in both terrestrial and planetary settings often contains rock particles. Here we present an experimental investigation of the influence of intergranular particles on the rheological behavior of ice. Experiments were performed on samples fabricated from 10‐μm ice powders +1‐μm graphite or 0.8‐μm alumina particles and subjected to elevated confining pressures. A critical particle fraction, ∼6%,
Authors
Chao Qi, Laura A. Stern, Asmin Pathare, William B. Durham, David L. Goldsby
Do we know how much fluvial sediment reaches the sea? Decreased river monitoring of U.S. coastal rivers
Given the present and future changing climate and human changes to land use and river control, river sediment fluxes to coastal systems are changing and will continue to change in the future. To delineate these changes and their effects, it is increasingly important to document the fluxes of river-borne sediment discharged to the sea. Unfortunately, broad-scale river sediment monitoring programs
Authors
Jonathan Warrick, John D. Milliman