Bottom trawling is the most widespread human activity affecting seabed habitats. Here, we collate all available data for experimental and comparative studies of trawling impacts on whole communities of seabed macroinvertebrates on sedimentary habitats and develop widely applicable methods to estimate depletion and recovery rates of biota after trawling. Depletion of biota and trawl penetration ...

As a new type of deep-sea anchoring foundation, thetorpedo anchor has the characteristics simple installation, low cost, and high bearing capacity. Compared with torpedo without an wing, end-bearing forms pile end resistance using plate, thus further improving its uplift By conducting pullout model test anchors, we have compared analyzed effects angle bearing-plate radius on T, EN3, EN4, EC typ...

Seabed soil layer composed of soft sediments, which has a high water content, low bulk density and shear strength, great influence on deep-sea engineering devices. Therefore, accurate measurement the mechanical properties seabed sediments is prerequisite for construction safe operation projects. In this study, geology in situ test system was developed to measure cone resistance, sleeve friction...

Target shape estimation with UWB pulse radars is promising as an imaging technique for household robots. We have already proposed a fast imaging algorithm, SEABED based on a reversible transform BST (Boundary Scattering Transform) between the received signals and the target shape. However the target image obtained by SEABED deteriorates in a noisy environment because it utilizes a derivative of...

The approach includes both theoretical and measurement components. One measurement approach exploits the very high geoacoustic information content in direct path measurements of seabed reflection and scattering. Another measurement approach, based on long-range reverberation, has much less information content but is nonetheless a powerful way to explore scales inherent in the seabed. Both kinds...

Rising demand for minerals and metals, including for use in the technology sector, has led to a resurgence of interest in exploration of mineral resources located on the seabed. Such resources, whether seafloor massive (polymetallic) sulfides around hydrothermal vents, cobalt-rich crusts (CRCs) on the flanks of seamounts or fields of manganese (polymetallic) nodules on the abyssal plains, canno...

Propagation and reverberation of acoustic fields in shallow water depend strongly on the spatial variability of seabed geoacoustic parameters, and lack of knowledge of seabed variability is often a limiting factor in acoustic modeling applications. However, direct sampling (e.g., coring) of vertical and lateral variability is expensive and laborious, and long-range inversion methods can fail to...

 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...