 A program of single frequency seabed classification using QTC VIEW with two separate frequencies has affirmed the effectiveness of this technology. Adding seabed classification to routine bathymetric surveys constitutes an efficient value-added solution to acquisition of needed baseline data for the enforcement of Marine Protected Area legislation and for fisheries habitat management. A local...

This thesis deals with mission planning for multi-robot seabed monitoring task with Autonomous Underwater Vehicles (AUV). The overall goal of this work is to design a mission planner that ensures visiting all places in a given area and keeps the AUVs in operational state by charging from the seabed station. Key part of designed mission planner is also the motion planning. We propose two differe...

Although acoustic frequency is not a spatial property of physical objects, in common language, pitch, i.e., the psychological correlated of frequency, is often labeled spatially (i.e., "high in pitch" or "low in pitch"). Pitch-height is known to modulate (and interact with) the response of participants when they are asked to judge spatial properties of non-auditory stimuli (e.g., visual) in a v...

A novel liquid-solid circulating fluidized bed (LSCFB) is modelled for protein recovery from feed broth. A typical LSCFB system consists of two individual columns (downer and riser), integrating two different operations (adsorption and desorption respectively) simultaneously with continuous adsorbent circulation between these columns. A general purpose, extensible, and dynamic model was written...

Sound backscattered to a sonar from a seabed decreases in intensity with increasing range (R) due to geometrical spreading. As a far-range approximation, a geometrical spreading correction of +30 log R decibels may be applied. A correction based on an accurate estimation of the area of the seabed ensonified by the sonar pulse incorporates additional terms that are a function of: range, sonic ra...

We describe two new species amongst the most common sponges living on the seabed (inter-reef) of the Great Barrier Reef (GBR) collected during a multi-agency survey (GBR Seabed Biodiversity Project 2003–2006) of the shelf benthic biota using a trawl and dredge at 1254 sites. More than 1,200 sponge morphospecies (operational taxonomic units or OTUs) were recognised, many of which are potentially...

The MAPEX2000 experiments were conducted in the Mediterranean Sea in March, 2000 to determine seabed properties using a towed acoustic source and receiver array. Towed systems are advantageous because they are easy to deploy from a ship and the moving platform offers the possibility for estimating spatially variable (range-dependent) seabed properties. In this paper, seabed parameters are deter...

To understand the influence of collector design parameters on the flow distribution among the solar collector absorber tubes, and as a first step to any detailed analysis of the influence of flow on heat transfer in the collector and on its consequent thermal performance, this study investigates the distribution of flow through a typical system consisting of two manifolds connected by a number ...

Solid Marine Wastes present on the seabed and floating on the sea surface were investigated in the Aegean Sea. Compared to other locations in the Mediterranean, litter concentration on Northern to Mid Aegean Seabed is moderate even in populated gulfs, whereas floating marine debris concentrations are low and dominated by recreational items, probably restricted to summer season.

Bottom trawling and seabed littering are two serious threats to seabed integrity. We present an overview of the distribution of seabed litter and bottom trawling in Norwegian waters (the Norwegian Sea and the southern Barents Sea). Vessel Monitoring System (VMS) records and trawl marks (TM) on the seabed were used as indicators of pressure and impact of bottom trawling, respectively. Estimates ...