A5045720609- Ocean Waves and Remote Sensing
- Oceanographic and Atmospheric Processes
- Arctic and Antarctic ice dynamics
- Tropical and Extratropical Cyclones Research
- Coastal and Marine Dynamics
- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Precipitation Measurement and Analysis
- Climate change and permafrost
- Soil Moisture and Remote Sensing
- Marine and fisheries research
- Meteorological Phenomena and Simulations
- Maritime Navigation and Safety
- Spatial Cognition and Navigation
- Advanced MEMS and NEMS Technologies
- Sensor Technology and Measurement Systems
- Target Tracking and Data Fusion in Sensor Networks
- Radio Wave Propagation Studies
- Advanced Fiber Optic Sensors
- Radar Systems and Signal Processing
- Advanced Optical Sensing Technologies
- Marine and Coastal Research
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Wave and Wind Energy Systems
U.S. Army Engineer Research and Development Center
2017-2024
United States Army
2017-2024
Pennsylvania State University
2021
United States Army Corps of Engineers
2020
Stennis Space Center
2015-2016
United States Naval Research Laboratory
2015
University of Miami
2014
Abstract R/V Lance serendipitously encountered an energetic wave event around 77°N, 26°E on 2 May 2010. Onboard GPS records, interpreted as the surface signal, show largest waves recorded in Arctic region with ice cover. Comparing measurements a spectral model indicated three phases of interaction: (1) blocking by ice, (2) strong attenuation energy and fracturing forcing, (3) uninhibited propagation peak extension allowed to higher frequencies (above peak). Wave properties during cover...
Abstract A large collaborative program has studied the coupled air‐ice‐ocean‐wave processes occurring in Arctic during autumn ice advance. The included a field campaign western of 2015, with situ data collection and both aerial satellite remote sensing. Many analyses have focused on using improving forecast models. Summarizing synthesizing results from series separate papers, overall view is an shifting to more seasonal system. dramatic increase open water extent duration means that surface...
Abstract This paper presents a wave‐in‐ice model calibration study. Data used were collected in the thin ice of advancing autumn marginal zone western Arctic Ocean 2015, where pancake was found to be prevalent. Multiple buoys deployed seven wave experiments; data from four these experiments are present Wave attenuation coefficients calculated utilizing energy decay between two measuring simultaneously within covered region. Wavenumbers measured one experiments. Forcing parameters obtained...
Small, lightweight, and easy-to-deploy Global Positioning Satellite (GPS)-based miniature wave buoys (mini-buoys) are increasing in popularity. Most deployed as Lagrangian drifters, so their utility for engineering applications, requiring a nearshore mooring, has remained question. We evaluated the performance of five moored mini-buoys off coast Duck, North Carolina at Field Research Facility (FRF). collected 8 months data over two deployments; first near FRF's 8-m array then Datawell...
Abstract Two deep‐sea moorings were deployed 780 km off the coast of southern Taiwan for 4–5 months during 2010 typhoon season. Directional wave spectra, wind speed and direction, momentum fluxes recorded on two Extreme Air‐Sea Interaction buoys close passage Severe Tropical Storm Dianmu three tropical cyclones (TCs): Typhoon Fanapi, Super Megi, Chaba. Conditions sampled include significant heights up to 11 m speeds 26 s −1 . Details varied large‐scale spectral structure in frequency...
Abstract One of the scientific objectives U.S. Office Naval Research–sponsored Impact Typhoons on Ocean in Pacific (ITOP) campaign was improved understanding air–sea fluxes at high wind speeds. Here authors present first-ever direct measurements momentum recorded typhoons near surface. Data were collected from a moored buoy over 3 months during 2010 typhoon season. During this period, three and tropical storm encountered. Maximum 30-min sustained speeds above 26 m s−1 recorded. are presented...
Abstract A new method to determine near‐surface vertical current shear from noncoherent marine X‐band radar (MR) data is introduced. three‐dimensional fast Fourier transform employed obtain the wave number‐frequency spectrum of a MR image sequence. Near‐surface currents are estimated Doppler‐shifted surface gravity signal within spectrum. They represent weighted mean upper ocean flow. The longer waves on which estimates based, greater their effective depth. novelty lies in number‐dependent...
Waves can drastically transform a sea ice cover by inducing break-up over vast distances in the course of few hours. However, relatively detailed studies have described this phenomenon quantitative manner, and process waves needs to be further parameterized verified before it reliably included forecasting models. In present work, we discuss parameterization demonstrate existence an observational threshold separating breaking non-breaking cases. This is based on information from two recent...
Abstract This study presents the most comprehensive set of in situ and remote sensing measurements wave number, hence dispersion relation, ice to date. A number surface‐following buoys were deployed sea from R/V Sikuliaq , which also hosted an X‐band marine radar, during ONR Arctic Sea State field experiment. The heave‐slope‐correlation method was used estimate root‐mean‐square buoys. highly sensitive noise, extensive quality control measures developed isolate real signals estimated number....
Similar in strength to hurricanes, Extratropical Cyclones (ECs) are responsible for innavigable sea states, coastal inundation and erosion, subsequent destruction infrastructure. Across modern operational wave models, there exists a known systematic underestimation of heights during these extreme events. Using global database EC storm tracks 36 years satellite altimeter data, we examine structure assess model performance through centered composite analyses significant height (Hs) U10 wind...
Investigation of 37,106 ocean surface wave spectra from the Pacific, Atlantic Ocean, and Gulf Mexico demonstrate that swell modulates energy level high frequency tail wind-sea spectrum, altering sea roughness. With a mixture swell, part follows well-known f-4 (equilibrium range) f-5 (saturation power laws. Swell levels but does not change power-law structure. For with minimal winds, follow −4, −5 paradigm, correlates to steepness wind speed. shifts transition between two sub-ranges towards...
Tropical cyclones (TC) are some of the most intense weather systems on Earth and responsible for generating hazardous waves sea surface that dominate extreme wave climate in several regions, including Gulf Mexico U.S. East Coast. Modeling these is crucial engineering applications, yet it notoriously difficult, due to TC’s compact structure rapid evolution space time relative other systems. To better understand under TCs, we use satellite altimeter data paired with TC tracks. We parse by...
Abstract Extratropical cyclones (ECs) produce comparable wave heights and hazardous sea states to those under hurricanes. With strong wind speeds considerably larger diameters, the impact of ECs on global climate is substantial. Because occur more frequently, move quickly, exist in a large variety sizes shapes, these storms are not as well documented. Here, we present findings from EC tracking algorithm aimed at creating an database producing storms. We focus major ocean basins extratropical...
Polynyas, regions of open water enclosed by sea ice, are persistent features near the Antarctic coast as well in pack ice. Waves known to occur within polynyas. If a polynya is sufficiently separated from “blue” Southern Ocean then it can be considered isolated waves. Wave energy polynyas must generated locally. During offshore wind conditions, could provide long fetch for waves develop, and wind-waves may steep enough break ice inside outward. This contrast typical focus...
Abstract This paper describes the new Extreme Air–Sea Interaction (EASI) buoy designed to measure direct air–sea fluxes, as well mean properties of lower atmosphere, upper ocean, and surface waves in high wind wave conditions. The design its associated deep-water mooring are discussed. performance EASI during 2010 deployment off Taiwan, where three typhoons were encountered, is summarized.
Abstract Spectral wave parameters from 11 platforms, measured during the recent Impact of Typhoons on Ocean in Pacific (ITOP) experiment, are intercompared. Two moorings, separated by ~180 km, were deployed a section “typhoon alley” off coast Taiwan for 4 months. Each mooring consisted an Air–Sea Interaction Spar (ASIS) buoy that was tethered to moored Extreme (EASI) buoy. EASI, design which is based hull 6-m Navy Oceanographic Meteorological Automatic Device (NOMAD) buoy, validated as 1D...
A laboratory experimental study conducted in a freshwater wave flume installed refrigerated room characterized the modifications of propagation along on-site manufactured ice covers. Monochromatic surface waves various amplitudes and frequencies were generated propagated through three types covers: sheet ice, broken floes, grease ice. This spatial evolutions height attenuation phase speed changes. Wave increased significantly relative to open water values while no significant changes present...
Abstract Surface gravity waves are formed by kinetic energy transfer across the air‐sea interface. Significant improvements have been made in understanding influence of wind on input waves. However, impact gustiness remains underexplored, and little is known about mechanisms through which gusts alter wavy surface. In this study, we utilize three‐months observational data collected during 2010 Impact Typhoons Ocean Pacific experiment to investigate relationship between gustiness. Results show...
Abstract “Sea State and Boundary Layer Physics of the Emerging Arctic Ocean” is an ongoing Departmental Research Initiative sponsored by Office Naval ( http://www.apl.washington.edu/project/project.php?id=arctic_sea_state ). The field component took place in fall 2015 within Beaufort Chukchi Seas involved deployment a number wave instruments, including downward-looking Riegl laser rangefinder mounted on foremast R/V Sikuliaq . Although time series measurements stationary vessel are thought...