A5014177561- Coastal and Marine Dynamics
- Ocean Waves and Remote Sensing
- Seismic Waves and Analysis
- Tropical and Extratropical Cyclones Research
- Remote Sensing and LiDAR Applications
- Geophysics and Gravity Measurements
- Coastal wetland ecosystem dynamics
- Advanced Vision and Imaging
- Underwater Vehicles and Communication Systems
- Image and Video Stabilization
- Aeolian processes and effects
- Seismic Imaging and Inversion Techniques
- Robotics and Sensor-Based Localization
- Underwater Acoustics Research
Scripps Institution of Oceanography
2021-2024
University of California, San Diego
2024
Abstract Waves overtop berms and seawalls along the shoreline of Imperial Beach (IB), CA when energetic winter swell high tide coincide. These intermittent, few-hour long events flood low-lying areas pose a growing inundation risk as sea levels rise. To support city response management, an IB warning system was developed. Total water level (TWL) forecasts combine predictions tides sea-level anomalies with wave runup estimates based on incident nonlinear model SWASH. In contrast to widely...
Nearshore bathymetry estimated from video acquired by a hovering UAV is compared with ground truth. Bathymetry estimates the widely used cBathy algorithm are improved crest tracking (with machine learning-aided annotations) near breaking through surf zone. Individual wave crests (distinguished toe that can move down front face) in timestacks determined deep-learning neural network and zone depth computed celerity. Time-2D spatial transforms (cBathy) to estimate celerity between 10-m depth....
Wave runup estimates are used in erosion and overtopping models, coastal structure design. However, depends on often incompletely known surf swash bathymetry. The many existing parameterizations characterizing bathymetry with only the foreshore (swash zone) beach slope βf necessarily of limited accuracy. Here, an empirical model relating to incident wave spectra is extended include effective, mid-surfzone slope, βeff, that cross-shore location midpoint breaking-wave dissipation. trained...
Abstract Understanding and predicting changes in shoreline location are critical for coastal planners. In situ monitoring is accurate but not widely available. Satellite observations of shorelines have global coverage, their accuracy predictive capacity been fully explored. Abundant beach surveys extensive wave Southern California provide a unique ground truth the interpretation satellite‐derived recently wetted waterlines. We combine 23 years waterline position estimates from satellite...
Abstract Numerical predictions of nearshore waves and shoreline runup are usually initialized on the inner shelf, seaward surfzone, with sea‐swell (SS) from local wave buoys or regional models. Lower frequency infragravity (IG) not reliably measured by included in Here, co‐located pressure velocity observations used to characterize IG 10–15 m depth southern California. Shoreward propagating often dominated free waves, boundwave energy fraction <30% for moderate low incident SS waves. Only...
Co-located pressure and velocity observations in 10-15m depth are used to estimate the relative contribution of bound free infragravity (IG) wave energy IG field. Shoreward seaward going waves analyzed separately. At Southern California sites, shoreward propagating dominated by waves, with fraction <30% for moderate incident sea-swell <10% low sea-swell. Only 5% records energetic long swell show primarily waves. Consistent theory, scales as square (frequency integrated) energy, a...
Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL UAV Video-Based Estimates of Nearshore Bathymetry 20 Pages Posted: 5 Aug 2022 See all articles by Athina LangeAthina LangeUniversity California San Diego Scripps Institution OceanographyJulia FiedlerUniversity OceanographyMark MerrifieldUniversity OceanographyR. T. GuzaUniversity Oceanography Date Written: July 15, Abstract bathymetry estimated from...