A5023039963- Coastal and Marine Dynamics
- Aeolian processes and effects
- Coastal wetland ecosystem dynamics
- Geological formations and processes
- Flood Risk Assessment and Management
- Tropical and Extratropical Cyclones Research
- Remote Sensing and LiDAR Applications
- earthquake and tectonic studies
- Ocean Waves and Remote Sensing
- Seismic Waves and Analysis
- Oil Spill Detection and Mitigation
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Coastal and Marine Management
- Oceanographic and Atmospheric Processes
- Earthquake and Tsunami Effects
- 3D Surveying and Cultural Heritage
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Maritime and Coastal Archaeology
- Soil erosion and sediment transport
- Marine and environmental studies
- Seismic Imaging and Inversion Techniques
- Marine and Offshore Engineering Studies
- Plant Ecology and Soil Science
Scripps Institution of Oceanography
2015-2024
University of California, San Diego
2015-2024
Murphy Oil Corporation (United States)
2011
Coastal seacliff erosion in California threatens property and public safety, whereas coastal beach the tourism economy. While rivers, seacliffs, gullies supply majority of littoral material to beaches, relative contributions these sources are coming into question. These beach-sediment must be accurately quantified formulate proper solutions for zone management.This study evaluated gully Oceanside Littoral Cell using airborne LIght Detection And Ranging (LIDAR). Seacliff were compared with...
Abstract Previous studies have estimated that coastal cliffs exist on about 80% of the global shoreline, but not been validated a scale. This study uses two approaches to capture information worldwide existence and erosion cliffs: detailed literature survey imagery search, GIS‐based mapping analysis. The review show in 93% combined recognized independent states non‐independent regions (total 213 geographic units). Additionally, cliff retreat rates quantified at least one location within 33%...
Seacliff changes evaluated using both terrestrial and airborne lidar are compared along a 400 m length of coast in Del Mar, California. The many large slides occurring during the rainy, six-month study period (September 2004 to April 2005) were captured by systems, alongshore variation cliff face volume estimated with systems strongly correlated (r 2 = 0.95). How- ever, relatively small reliably detected only more accurate lidar, total eroded system was 30 percent larger than corresponding...
Erosion of a 2.5 km-long sedimentary coastal cliff by waves and rainfall is explored with three years weekly observations. A truck-mounted lidar resolved the fronting beach convoluted surface ~10–25 m high cliffs. Volumes 4362 erosion events ranged up to 885 m3 (mean 3.3 m3). The three-year cumulative was clustered alongshore variable. Cliff base wave impact heights were estimated model empirical runup formula, validated rates, incident heights, wave-cliff impacts, all elevated during...
Abstract. The frequency, spatial distribution, and dimensions of coastal cliff retreats, a basic statistic underlying top hazard assessment, are presented for 7.1 km unprotected slowly retreating cliffs near Point Loma in San Diego, California, US. Using 8 airborne light detection ranging (lidar) surveys collected over 5.5 years, 130 individual edge failures (primarily rockfalls, block falls, topples) were detected. Footprint areas varied from 3 to 268 m2, maximum landward retreats 0.8 10 m,...
Abstract Coastal cliff erosion from storm waves is observed worldwide, but the processes are notoriously difficult to measure during extreme wave conditions when most normally occurs, limiting our understanding of processes. Over January–February 2014, largest Atlantic storms in at least 60 years with deepwater significant heights 6–8 m, cliff‐top ground motions showed vertical displacements excess 50–100 µm; an order magnitude larger than observations made previously. Repeat terrestrial...
Quantifying coastal cliff erosion is critical for improved predictions of change and management. However, few studies have been conducted at a scale (>100 km) resolution (~1 m) sufficient to constrain regional change. Here, we quantified 866 km the California coastline using airborne LiDAR data collected in 2009–2011 2016. A semi-automated method was used map faces. Negative (volume loss) positive gain) objects were created by grouping adjacent cells vertical areal thresholds surface optical...
Airborne LiDAR datasets were used to measure erosion and retreat along 866 km of California coastal cliffs between 2009–2011 2016. Erosion exceeding the level detection was observed at 55% cliffs. State-averaged cliff face top rates both 0.06 m yr−1, varied alongshore, with more in northern compared southern central California. Retreat higher for unarmored fronted by sandy beaches. Mean lower than previous studies conducted 1920s–1930s 1998/2002, 1998 2009–2011. However, average statistical...
Abstract Wave action is a fundamental mechanism in seacliff erosion, whereby wave undercutting creates an unstable cantilevered profile and can lead to large catastrophic cliff failures, thus threatening coastal infrastructure. This study investigated the instability of two such failures that occurred Solana Beach, California, by combining terrestrial LIDAR scanning, cantilever beam theory finite element analysis. Each landslide was detected evaluating surface change between subsequent high...
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...
Abstract Concurrent observations of waves at the base a southern California coastal cliff and seismic motion were used to explore wave–cliff interaction test proxies for wave forcing on cliffs. Time series sand levels extracted from pressure sensor programmatically compute various impact metrics (e.g. significant height). Wave–cliff was controlled by tide, incident waves, beach levels, varied low tides with no impacts, high continuous interaction. Observed heights differed standard Normal...
Palaseanu-Lovejoy, M.; Danielson, J.; Thatcher, C.; Foxgrover, A.; Barnard, P.; Brock, J., and Young, A., 2016. Automatic delineation of seacliff limits using lidar-derived high-resolution DEMs in Southern California. In: J.C.; Gesch, D.B.; Parrish, C.E.; Rogers, J.N., Wright, C.W. (eds.), Advances Topobathymetric Mapping, Models, Applications. Journal Coastal Research, Special Issue, No. 76, pp. 162–173. Coconut Creek (Florida), ISSN 0749-0208.Seacliff erosion is a serious hazard with...
Abstract Widespread erosion associated with energetic waves of the strong 2015–2016 El Niño on U.S. West Coast has been reported widely. However, Southern California was often sheltered from northerly approach direction offshore waves. The few large swells that reached were not synchronous highest tides. Although west coast‐wide tidal anomalies relatively in 2015–2016, California, total water levels (sum tides, anomalies, and wave superelevation) lower than during 1997–1998 Niño, comparable...
Time series of storm wave runup and overtopping observed on a sandy beach with scanning LiDAR are compared predictions the phase-resolving numerical model SWASH 1D. is initialized 300 m offshore (8-m depth) phase-resolved estimates shoreward seaward propagating waves, co-located pressure sensor-current meter. During 5 h conditions (2.4-m significant height, 17-sec peak period, high tide) swash zone bed level erosion 80 cm was included in simulations. Model bathymetry an ensemble historical...
[1] Ground motions atop a southern California, USA coastal cliff are compared with water level fluctuations observed at the base, and ground 10 km inland. At high tide, top in three frequency bands were generated locally by ocean waves base: (1) high-frequency (>0.3 Hz) "shaking" caused impacting cliff, (2) gravitational loading-induced "swaying" of incident sea swell (0.05–0.1 Hz), (3) slow infragravity frequencies (0.006–0.05 Hz). wave frequencies, vertical displacement base coherent...
Abstract Rocky coast cliff retreat presents a hazard to coastal communities and infrastructure that is potentially amplified under rising sea level conditions, among other factors. Unfortunately, constraints on rates are typically limited those derived from imagery maps spanning the last ∼100 years. Here, we use newly developed coupled model of shore platform profile evolution cosmogenic radionuclide production considers influence relative (RSL) rise, weathering, material resistance, wave...
The coarse sediment fraction of geologic formations exposed in 42 km southern California seacliffs the Oceanside Littoral Cell was estimated using more than 400 samples. An impulse laser, oblique photographs, and coastal maps were used to define thickness alongshore extent units seacliffs. (defined as diameter > 0.06 mm) each unit by sieving. About 80% cliff face is can contribute beach building. Finer sediments are transported offshore waves currents. Although there some differences,...
Abstract Coastal cliff erosion is caused by a combination of marine forcing and sub‐aerial processes, but linking to the environmental drivers remains challenging. One key component these energy transfer from wave–cliff interaction. The aim this study directly observe ground motion in response wave impacts at an individual scale. Measurements are described two coastal sites: 45‐minute pilot southern California, USA 30‐day deployment Taranaki, New Zealand. Seismometers, pressure sensors video...
Abstract Storm wave run-up causes beach erosion, overtopping, and street flooding. Extreme runup estimates may be improved, relative to predictions from general empirical formulae with default parameter values, by using historical storm waves eroded profiles in numerical simulations. A climatology of at Imperial Beach, California is developed the model SWASH, over a decade hindcast spectral observed depth profiles. For use local flood warning system, relationship between incident energy...