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Articles 1 - 21 of 21
Full-Text Articles in Physical Sciences and Mathematics
Transition From Contraction To Extension In The Northeastern Basin And Range: New Evidence From The Copper Mountains, Nevada, Jeffrey M. Rahl, Allen J. Mcgrew, Kenneth A. Foland
Transition From Contraction To Extension In The Northeastern Basin And Range: New Evidence From The Copper Mountains, Nevada, Jeffrey M. Rahl, Allen J. Mcgrew, Kenneth A. Foland
Allen J. McGrew
New mapping, structural analysis, and 40Ar/39Ar dating reveal an unusually well‐constrained history of Late Eocene extension in the Copper Mountains of the northern Basin and Range province. In this area, the northeast‐trending Copper Creek normal fault juxtaposes a distinctive sequence of metacarbonate and granitoid rocks against a footwall of Upper Precambrian to Lower Cambrian quartzite and phyllite. Correlation of the hanging wall with footwall rocks to the northwest provides an approximate piercing point that requires 8–12 km displacement in an ESE direction. This displaced fault slice is itself bounded above by another normal fault (the Meadow Fork Fault), which brings …
Multispectral Image Analysis Of Glaciers And Glacier Lakes In The Chugach Mountains, Alaska, Jeffrey Kargel, Matthew Beedle, Andrew Bush, Francisco Carreño, Elena Castellanos, Umesh Haritashya, Gregory Leonard, Javier Lillo, Ivan Lopez, Mark Pleasants, Edward Pollock, David Wolfe
Multispectral Image Analysis Of Glaciers And Glacier Lakes In The Chugach Mountains, Alaska, Jeffrey Kargel, Matthew Beedle, Andrew Bush, Francisco Carreño, Elena Castellanos, Umesh Haritashya, Gregory Leonard, Javier Lillo, Ivan Lopez, Mark Pleasants, Edward Pollock, David Wolfe
Umesh Haritashya
The Chugach Mountains contain the largest nonpolar alpine glaciers in the world and include a wide variety of glacier types: some are land terminating; some calve variously into tidewater, lakes, and rivers; some are heavily debris covered; some are surge-type, whereas others are neither debris covered nor surge type. Nearly all are retreating, thinning, or both, though some rare ones are advancing, and some are thickening at high elevations. To assist the further documentation of changes, we establish an inventory of glaciers in the eastern Chugach Mountains. Several case studies of diverse glacier types showcase remotesensing applications and are used …
Using The Longitudinal River Profile Of The Rio San Jose And 40ar/39ar Dating Of Late-Cenozoic Basalts To Test Models For Mantle-Driven Uplift Across The Jemez Lineament, New Mexico, Mike Channer, Jason Ricketts, Matt Zimmerer, Matt Heizler, Karl Karlstrom
Using The Longitudinal River Profile Of The Rio San Jose And 40ar/39ar Dating Of Late-Cenozoic Basalts To Test Models For Mantle-Driven Uplift Across The Jemez Lineament, New Mexico, Mike Channer, Jason Ricketts, Matt Zimmerer, Matt Heizler, Karl Karlstrom
Mike Channer
Mantle-driven differential uplift has been proposed to contribute to dynamic typography in the western United States. Neogene and ongoing mantle flow is postulated to be driven by upper mantle convection and to cause subtle broad-scale differential uplift that affects surface topography. This study focuses on the possible connection between mantle convection and surface topography along the Jemez lineament in New Mexico and is motivated by tomographic images from the EarthScope experiment that show this zone is underlain by low-velocity mantle that potentially could drive uplift. To test this possible connection, we constructed a longitudinal profile of the Rio San Jose …
Recalibrating Aeolian Sand Transport Models, Douglas Sherman, Bailiang Li, Jean Ellis, Eugene Farrell, Luis Maia, Helena Granja
Recalibrating Aeolian Sand Transport Models, Douglas Sherman, Bailiang Li, Jean Ellis, Eugene Farrell, Luis Maia, Helena Granja
Jean Taylor Ellis
No abstract provided.
Wave Transmission And Water Setup Behind An Emergent Rubble-Mound Breakwater, Lorenzo Cappietti, Douglas Sherman, Jean Ellis
Wave Transmission And Water Setup Behind An Emergent Rubble-Mound Breakwater, Lorenzo Cappietti, Douglas Sherman, Jean Ellis
Jean Taylor Ellis
No abstract provided.
Storm-Driven Hydrodynamic And Sedimentological Impacts To An Engineered Coast, Jean Ellis, Lorenzo Cappietti
Storm-Driven Hydrodynamic And Sedimentological Impacts To An Engineered Coast, Jean Ellis, Lorenzo Cappietti
Jean Taylor Ellis
No abstract provided.
Characterization Of Aeolian Streamers Using Time-Average Videography, Douglas Sherman, Houser Chris, Jean Ellis, Eugene Farrell, Bailiang Li, Robin Davidson-Arnott, Andrea Baas, Luis Maia
Characterization Of Aeolian Streamers Using Time-Average Videography, Douglas Sherman, Houser Chris, Jean Ellis, Eugene Farrell, Bailiang Li, Robin Davidson-Arnott, Andrea Baas, Luis Maia
Jean Taylor Ellis
No abstract provided.
Storm-Induced Inner-Continental Shelf Circulation And Sediment Transport: Long Bay, South Carolina, John Warner, Charlene Silvester, Brandy Armstrong, George Voulgaris, Timothy Nelson, William Schwab, Jane Denny
Storm-Induced Inner-Continental Shelf Circulation And Sediment Transport: Long Bay, South Carolina, John Warner, Charlene Silvester, Brandy Armstrong, George Voulgaris, Timothy Nelson, William Schwab, Jane Denny
George Voulgaris
Long Bay is a sediment-starved, arcuate embayment located along the US East Coast connecting both South and North Carolina. In this region the rates and pathways of sediment transport are important because they determine the availability of sediments for beach nourishment, seafloor habitat, and navigation. The impact of storms on sediment transport magnitude and direction were investigated during the period October 2003–April 2004 using bottom mounted flow meters, acoustic backscatter sensors and rotary sonars deployed at eight sites offshore of Myrtle Beach, SC, to measure currents, water levels, surface waves, salinity, temperature, suspended sediment concentrations, and bedform morphology. Measurements identify …
Vertical Distribution Of Grain Size For Wind Blown Sand, Eugene Farrell, Douglas Sherman, Jean Ellis, Bailiang Li
Vertical Distribution Of Grain Size For Wind Blown Sand, Eugene Farrell, Douglas Sherman, Jean Ellis, Bailiang Li
Jean Taylor Ellis
No abstract provided.
Gulf Of Mexico Processes, Jean Ellis, Brad Dean
Gulf Of Mexico Processes, Jean Ellis, Brad Dean
Jean Taylor Ellis
No abstract provided.
Implementation Of The Vortex Force Formalism In The Coupled Ocean-Atmosphere-Wave-Sediment Transport (Coawst) Modeling System For Inner Shelf And Surf Zone Applications., Nirnimesh Kumar, George Voulgaris, John Warner, Maitane Olabarietta
Implementation Of The Vortex Force Formalism In The Coupled Ocean-Atmosphere-Wave-Sediment Transport (Coawst) Modeling System For Inner Shelf And Surf Zone Applications., Nirnimesh Kumar, George Voulgaris, John Warner, Maitane Olabarietta
George Voulgaris
No abstract provided.
Temporal And Spatial Variability Of Aeolian Sand Transport: Implications For Field Measurements, Jean Ellis, Douglas Sherman, Eugene Farrell, Bailiang Li
Temporal And Spatial Variability Of Aeolian Sand Transport: Implications For Field Measurements, Jean Ellis, Douglas Sherman, Eugene Farrell, Bailiang Li
Jean Taylor Ellis
No abstract provided.
Implementation And Modification Of A Three-Dimensional Radiation Stress Formulation For Surf Zone And Rip-Current Applications, Nirnimesh Kumar, George Voulgaris, John Warner
Implementation And Modification Of A Three-Dimensional Radiation Stress Formulation For Surf Zone And Rip-Current Applications, Nirnimesh Kumar, George Voulgaris, John Warner
George Voulgaris
Regional Ocean Modeling System (ROMS v 3.0), a three-dimensional numerical ocean model, was previously enhanced for shallow water applications by including wave-induced radiation stress forcing provided through coupling to wave propagation models (SWAN, REF/DIF). This enhancement made it suitable for surf zone applications as demonstrated using examples of obliquely incident waves on a planar beach and rip current formation in longshore bar trough morphology (Haas and Warner, 2009). In this contribution, we present an update to the coupled model which implements a wave roller model and also a modified method of the radiation stress term based on Mellor (2008, 2011a,b,in …
A Call For Standardization Of Aeolian Process Measurements: Moving Beyond Relative Case Studies, Thomas Barchyn, Chris Hugenholtz, Jean Ellis
A Call For Standardization Of Aeolian Process Measurements: Moving Beyond Relative Case Studies, Thomas Barchyn, Chris Hugenholtz, Jean Ellis
Jean Taylor Ellis
No abstract provided.
Measuring Aeolian Saltation: A Comparison Of Sensors, Douglas Sherman, Bailiang Li, Eugene Farrell, Jean Ellis, Walter Cox, Luis Maia, Paulo Sousa
Measuring Aeolian Saltation: A Comparison Of Sensors, Douglas Sherman, Bailiang Li, Eugene Farrell, Jean Ellis, Walter Cox, Luis Maia, Paulo Sousa
Jean Taylor Ellis
No abstract provided.
Protocols For Characterizing Aeolian Mass-Flux Profiles, Jean Ellis, Bailiang Li, Eugene Farrell, Douglas Sherman
Protocols For Characterizing Aeolian Mass-Flux Profiles, Jean Ellis, Bailiang Li, Eugene Farrell, Douglas Sherman
Jean Taylor Ellis
No abstract provided.
Measuring The Transport Of Aeolian Sand With A Microphone System, Jean Ellis, Rebecca Morrison, Barry Priest
Measuring The Transport Of Aeolian Sand With A Microphone System, Jean Ellis, Rebecca Morrison, Barry Priest
Jean Taylor Ellis
No abstract provided.
Effects Of Sampling Frequency On Wave Characterization, Jean Ellis, Douglas Sherman
Effects Of Sampling Frequency On Wave Characterization, Jean Ellis, Douglas Sherman
Jean Taylor Ellis
No abstract provided.
A Coastal Environment Field And Laboratory Activity For An Undergraduate Geomorphology Course, Jean Ellis, Paul Rindfleisch
A Coastal Environment Field And Laboratory Activity For An Undergraduate Geomorphology Course, Jean Ellis, Paul Rindfleisch
Jean Taylor Ellis
A field and laboratory exercise for an undergraduate geomorphology class is described that focuses on the beach. The project requires one day of fieldwork and two laboratory sessions. In the field, students measure water surface fluctuations (waves) with a pressure sensor, survey beach profiles, collect sediment samples, and observe the beach state. In the laboratory, students wash and dry sediments, complete a grain size analysis, and determine sediment volumes. Students produce a report that includes analysis of wave data and beach profiles and a discussion of their findings.
Variability Of The Apparent Von Kármán Constant During Aeolian Saltation, Bailiang Li, Douglas Sherman, Eugene Farrell, Jean Ellis
Variability Of The Apparent Von Kármán Constant During Aeolian Saltation, Bailiang Li, Douglas Sherman, Eugene Farrell, Jean Ellis
Jean Taylor Ellis
No abstract provided.
Waves Initiative Within Seacoos, George Voulgaris, Brian Haus, Paul Work, Lynn Shay, Harvey Seim, Robert Weisberg, James Nelson
Waves Initiative Within Seacoos, George Voulgaris, Brian Haus, Paul Work, Lynn Shay, Harvey Seim, Robert Weisberg, James Nelson
George Voulgaris
Amongst other ocean state parameters, the development of a wave measurement program was supported as part of the Southeast U.S. Atlantic Coastal Ocean Observing System (SEACOOS). The program focused on supporting nearshore wave measurements using both cabled and autonomous systems but also examined the feasibility of using HF Radar systems for remote estimation of wave parameters. The nearshore stations have provided a significant database on directional wave climate for a number of nearshore locations in the region that provide valuable information to coastal engineers and managers for sustainable development along the coast of the southeastern United States. The ability of …