TASKS

Statement of work: Field

1F. Acquisition and preparation of equipment and instrumentation for use in the field measurement program
2F. Deployment, turnaround and recovery during the 2007 pilot field experiment of one surface mooring with time-series meteorological sensors and two bottom tripods and one bottom quadrapod with time-series acoustical and optical sensors for measuring waves, flow, sediment concentration, and seabed properties.
3F. Site characterization prior to and during the 2007 pilot field experiment including shipboard acoustic sub-bottom measurements, water column profile measurements, and acquisition and analysis of boxcores.
4F. Analysis of the results of the 2007 pilot field experiment
5F. Participation in the execution and analysis of 2007 laboratory experiments at Johns Hopkins University, including application of acoustic field instrumentation.
6F. Deployment, turnaround and recovery during the 2008 main field experiment of one surface mooring with time-series meteorological sensors and two bottom tripods and one bottom quadrapod with time-series acoustical and optical sensors for measuring waves, flow, sediment concentration, and seabed properties.
7F. Site characterization prior to and during the 2008 main field experiment including shipboard acoustic sub-bottom measurements, water column profile measurements, and acquisition and analysis of boxcores.
8F. Analysis of the results of the 2008 main field experiment and synthesis with laboratory, theoretical and modeling results.
9F. Extended analysis of the results of the 2007 and 2008 field measurements and synthesis with laboratory, theoretical and modeling results.
10F. Participation in the execution and analysis of 2009 laboratory experiments at Johns Hopkins University, including application of the acoustic field instrumentation.
11F.Deployment, turnaround and recovery during the 2010 field experiment at a new site with different seabed properties of one surface mooring with time-series meteorological sensors and two bottom tripods and one bottom quadrapod with time-series acoustical and optical sensors for measuring waves, flow, sediment concentration, and seabed properties.
12F. Site characterization prior to and during the 2010 field experiment at a new site with different seabed properties including shipboard acoustic sub-bottom measurements, water column profile measurements, and acquisition and analysis of boxcores.
13F. Analysis of the results of the 2010 field experiment and synthesis with laboratory, theoretical and modeling results.

Statement of Work: Laboratory modeling

1L. Modification of the JHU wave tank for mud bottom; acquisition of wave absorber, ADV, mud, video camera. Build and test programmable rotary viscometer.
2L. Execution and analysis of direct wave damping (Type A) and mud migration experiments. Modification of wavemaker software for wave group forcing--including bound long wave.
3L. Execution and analysis of field conditions by utilizing the field linear Doppler array in wave tank. Use field spectra for wavemaker forcing.
4L. Execution and analysis of wave group experiments for bound long wave absorption by mud, as part of Type B.
5L. Conduct experiments on Type C, resonant interactions, including wave directionality.
6L. Conduct experiments on Type D, shear instabilities of the bottom boundary layer.
7L. Carry out spectral tests, Type E, with broad banded spectra. Further laboratory testing of interesting cases that arise.
8L. Carry out additional spectral tests, modeling the field with field linear Doppler array.

Statement of Work: Theory and Modeling

1T. Theoretical analysis of thin non-Newtonian mud layer to derive effective Newtonian viscosity in terms of mud concentration, wave amplitude and frequency. Comparison to laboratory/field measurements.
2T. Development of asymptotic theory for direct damping of monochromatic and solitary waves and narrow-band random waves over fluid mud. Comparison to measurements.
3T. Development of asymptotic theory for indirect damping of narrow-banded short waves by fluid-mud for (a) wave packet of soliton envelope and (b) sinusoidally modulated short waves. Comparison with laboratory experiments.
4T. Analysis of generalized resonance conditions for nonlinear interactions among broadband surface waves and water-mud interfacial waves.
5T. Study of shear flow instability of the water-mud interface using linear and weakly nonlinear stability analyses.
6T. Development of direct numerical (DNS) and large-eddy simulation (LES) capabilities for wave interactions with turbulent mud flows. Sub-grid scale closure models development and calibration with measurements.
7T. Modeling of direct and indirect dissipation of surface wave by bottom mud through the modification of bottom boundary conditions in direct phase-resolved wave simulations (SNOW). Perform SNOW simulations and quantitative comparisons to measurements.
8T. Development of multi-layer wave simulation and modeling capability in SNOW for generalized surface-wave and mud-layer wave resonant interactions.
9T. Extension of SNOW to include bottom turbulent mud flow using multi-layer coupling and large-wave simulations (LWS) and closure modeling.
10T. Development of comprehensive large-scale direct simulation capabilities for broad-band wave propagation and transformation over (varying) bottom mud on HPC platform. Obtain large-scale simulations over propagation distance of O(10) km, and perform comparisons to field measurements.
11T. Development of direct Monte-Carlo simulations and extensive datasets using SNOW. Obtain statistical characteristics of wave dissipation and dependence on mud layer properties.
12T. Development of wave dissipation model for wave prediction models, such as SWAN.