A5040089025- Coastal and Marine Dynamics
- Coastal wetland ecosystem dynamics
- Geophysics and Gravity Measurements
- Remote Sensing and LiDAR Applications
- Atmospheric and Environmental Gas Dynamics
- Peatlands and Wetlands Ecology
- Flood Risk Assessment and Management
- Soil erosion and sediment transport
- Geological formations and processes
- Remote Sensing in Agriculture
- Fluid Dynamics and Turbulent Flows
- Mine drainage and remediation techniques
- Groundwater and Isotope Geochemistry
- Ocean Waves and Remote Sensing
- Fecal contamination and water quality
- Oceanographic and Atmospheric Processes
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Soil and Unsaturated Flow
- Isotope Analysis in Ecology
- Hydrology and Sediment Transport Processes
- Water Quality and Pollution Assessment
- Fluid Dynamics and Vibration Analysis
- Fire effects on ecosystems
- Cyclone Separators and Fluid Dynamics
California Institute of Technology
2021-2024
University of California, Berkeley
2019-2021
Ames Research Center
2019
Stennis Space Center
2002
An irreversible increase in alluvial mudrock occurred with the Ordovician-Silurian evolution of bryophytes, challenging a paradigm that deep-rooted plants were responsible for this landscape shift. We tested idea increased primary production and plant organics promoted aggregation clay into flocs rivers facilitated mud deposition on floodplains. In experiments, we observed readily flocculated organic concentrations common to modern rivers, yielding settling velocities three orders magnitude...
Abstract The transport and deposition of mud in rivers are key processes fluvial geomorphology biogeochemical cycles. Recent work indicates that flocculation might regulate by increasing settling velocities, but we lack a calibrated mechanistic model for freshwater rivers. Here, developed semi‐empirical floc diameter velocity We compiled global data set river suspended sediment concentration‐depth profiles inverted them situ using the Rouse‐Vanoni equation. On average, clay silt (diameters...
Abstract. Coastal marsh survival relies on the ability to increase elevation and offset sea level rise. It is therefore important realistically model sediment fluxes between marshes, tidal channels, bays as availability controls accretion. Traditionally, numerical models have been calibrated validated using in situ measurements at a few locations within domain of interest. These datasets typically provide temporal information but lack spatial variability. This paper explores potential...
Abstract. Flocculation controls mud sedimentation and organic carbon burial rates by increasing settling velocity. Floc velocity can be predicted using a semi-empirical model that depends on turbulence, sediment concentration, geochemical variables or an explicit Stokes law-type floc diameter, permeability, fractal properties. However, validation of the models with direct field measurements is lacking. We employed camera, in situ particle sizing, analysis grain size-specific suspended...
New solar energy facilities on public lands in the deserts of southern California are being monitored long-term to detect environmental impacts. For this purpose, we have developed a framework for detecting changes vegetation cover region-wide using greenness index data sets from Moderate Resolution Imaging Spectroradiometer (MODIS) satellite sensor. This study focused three sites, Joshua Tree National Park (JOTR), Mojave Preserve (MOJA), and proximal group Development Focus Areas (DFAs)....
Suspended sediment collected by vegetation in marshes and wetlands contributes to vertical accretion, which can buffer against rising sea levels. Effective capture efficiency (ECE), a parameter quantifying the fraction of incoming suspended particles directly captured underwater surfaces, plays key role determining significance direct interception morphodynamic models. The ways physical characteristics collectors transitionally turbulent flows affect ECE are not yet thoroughly understood. We...
Abstract. Coastal marsh survival relies upon to their ability increase elevation and offset sea level rise. It is therefore fundamental realistically model the sediment fluxes between marshes, tidal channels bays. Traditionally, numerical models have been calibrated validated using in-situ measurements located in few locations within domain of interest. These datasets typically provide temporal information but lack spatial variability. This paper explores potential coupling with high...
Abstract. Flocculation controls mud sedimentation and organic carbon burial rates by increasing settling velocity. However, calibration validation of floc velocity models in freshwater are lacking. We used a camera, situ laser diffraction particle sizing, suspended sediment concentration–depth profiles to measure flocs Wax Lake Delta, Louisiana. developed new workflow that combines our multiple data sources distinguish between unflocculated attributes were previously difficult constrain....
Anthropogenic nitrogen inputs from the Mississippi-Atchafalaya River Basin have caused substantial environmental challenges in northern Gulf of Mexico, such as coastal eutrophication, harmful algal blooms, and seasonal hypoxia. Addressing these issues requires a better understanding complex sources nitrogen, which include fertilizers, groundwater, manure, sewage. In this study, we analyzed isotopic composition dissolved nitrate particulate Wax Lake Delta, major distributary that flows into...
Operational forecasts of significant wave height and period produced by the Naval Oceanographic Office (NAVOCEANO) were compared to measurements obtained Topography Experiment (TOPEX) altimeter data. Comparisons made between satellite forecast heights for periods 12, 24, 36, 48 hours. The Spectral Wave Prediction System (SWAPS) operated NAVOCEANO consists a coupled system which includes third-generation spectral model (WAM), shallow-water transformation models, harbor response model. This...