Our goal is to develop a comprehensive, verified community model that predicts nearshore hydrody-namics, sediment transport, and seabed morphology changes given offshore wave conditions and initial bathymetry. OBJECTIVES The basic scientific objective is to synthesize understanding of physical processes in the nearshore ocean by developing a model for waves and resulting radiation stresses and ...

Sensor network systems with UWB signal have a great potential for a fast communication and a high-resolution imaging, which are required for house-hold robots or rescue robots. For this application, we have already proposed a fast imaging algorithm, SEABED based on a reversible transform between the received signals and the target shape[1]. However, the image with SEABED is instable in a noisy ...

Pulse radars with UWB signals are promising as a high-resolution imaging technique that can be used for the non-destructive measurement of surface details in industrial products such as antennas and aircraft. We have already proposed a fast 3-D imaging algorithm, SEABED, that utilizes a reversible transform between the time delay and the target boundary. However, data acquisition is time-consum...

[1] We investigate how a local topographic disturbance of a flat seabed may become morphodynamically active, according to the linear instability mechanism which gives rise to sandwave formation. The seabed evolution follows from a Fourier integral, which can generally not be evaluated in closed form. As numerical integration is rather cumbersome and not transparent, we propose an analytical way...