It is well known that retrieval of the water leaving signal in coastal waters is qualitatively different than the procedure for open oceans. In particular, the dark pixel assumptions in the typical NIR atmospheric correction channels do not apply due to high concentration of suspended solids and the water constituents no longer covary with CHL. …
Tag Archive: MarineandOcean
Feb
20
Hydrodynamic modeling of Hampton/Seabrook Harbor, New Hampshire
The Hampton/Seabrook estuary is located at the southern end of the New Hampshire Seacoast area. As it is a dynamic system, tidally dominated, and continually changing, two major changes have become issues in recent years: erosion of a sandbar threatening waterfront homes), and sediment deposition in Seabrook Harbor. Flow between the Blackwater River and the …
Feb
20
Methodology to quantify vertical accelerations of planing craft in irregular waves
Planing craft operating in waves at high speeds can experience high, repetitive vertical accelerations that are random and nonlinear in relation to the sea condition. A proper understanding of vertical accelerations is critical to meet statistically based criteria for structural design, habitability, and equipment selection. Historically, it was assumed that planing craft vertical accelerations fit …
Feb
19
Development of two automated feed buoys for submerged fish aquaculture net-pens
Two prototype research feed buoys, designed with a feed capacity of a quarter-ton and one-ton respectively, were designed, modeled, constructed and field-tested to support raising aquaculture finfish in submerged cages at the University of New Hampshires Open Ocean Aquaculture Demonstration site. These two buoy systems consisted of a surface buoy, moorings to a submerged fish …
Feb
18
Sand bed morphodynamics under water waves and vegetated conditions
The littoral zone plays an integral role in the success of todays thriving society, providing a stable food supply as well as points of trade/transport for goods around the world. Key environmental processes in this region such as sediment transport, wave attenuation, and boundary layer development are directly governed by the presence of bathymetric features, …
Feb
16
Effect of irregular wave-induced pore pressure on seabed scour development around a verticle slender pile
This Masters thesis reports on a large scale investigation of scour development around a slender pile under irregular JONSWAP spectrum wave loading to better understand the processes behind scour development and to determine if bed pore pressure response influences scour development. A thorough background review of relevant scour-related topics is first presented. The scour dimensions …
Feb
16
Development of Two-Variable Maximum Power Point Tracking Control for Ocean Wave Energy Converters Utilizing a Power Analysis and Data Acquisition System
Ocean wave energy shows great potential as a developing form of renewable energy. However, challenges arise in maturing this technology to achieve cost-effective energy conversion. Development and testing of wave energy converters can be problematic due to the harsh environment in which they are operated. To promote development of this technology, a platform is needed …
Feb
12
Numerical simulation and prediction of loads in marine current turbine full-scale rotor blades
Marine current turbines are submerged structures and subjected to loading conditions from both the currents and wave effects. The associated phenomena posed significant challenge to the analyses of the loading response of the rotor blades and practical limitations in terms of device location and operational envelopes. The effect of waves on marine current turbines can …
Feb
10
Nonlinear roll motions of a frigate-type trimaran and susceptibility to parametric roll resonance
Two scale models (1:80 and 1:125) of a U.S. Navy concept for a frigate-type trimaran have been tested in the Davidson Laboratory towing tank as part of an extensive seakeeping investigation. Numerical models using a 6 DOF potential flow Rankine-Panel Method have been developed for the prototype vessel to study and validate the influence of …
Jan
20
Robust control of supercavitating vehicles in the presence of dynamic and uncertain cavity
Underwater travel is greatly limited by the speed that can be attained by the vehicles. Usually, the maximum speed achieved by underwater vehicles is about 40 m/s. Supercavitation can be viewed as a phenomenon that would help us to break the speed barrier in underwater vehicles. The idea is to make the vehicle surrounded by …