INCIPIENT CONDITION OF SEDIMENT MOTION IN GREAT DIMENSIONLESS FLOW DEPTH

Incipient Motion of Sediment Particles over Loose

New experimentals work were conducted to study the effects of sediment deposits’ thickness on the incipient motion of particles in a rigid rectangular channel. The results show that the deposits’ thickness significantly affects the channel’s ability to erode the sediment deposits. New equations were derived taking into account the effects of deposits’ thickness.

Motion and Depth from Optical Flow

Passive navigation of mobile robots is one of the challenging goals of machine vision. This note demonstrates the use of optical flow, which encodes the visual information in a sequence of time varying images [1], for the recovery of motion and the understanding of the three dimensional structure of the viewed scene. By using a modified version of an algorithm, which has recently been proposed ...

Depth and Flow From Motion Energy

This paper presents a model of motion perception that utilizes the output of motion-sensitive spatiotemporal filters. The power spectrum of a moving texture occupies a tilted plane in the spatiotemporal-frequency domain. The model uses 3-D (space-time) Gabor filters to sample this power spectrum. By combining the outputs of several such filters, the model estimates the velocity of the moving te...

Is the critical Shields stress for incipient sediment motion dependent on channel-bed slope?

[1] Data from laboratory flumes and natural streams show that the critical Shields stress for initial sediment motion increases with channel slope, which indicates that particles of the same size are more stable on steeper slopes. This observation is contrary to standard models that predict reduced stability with increasing slope due to the added downstream gravitational force. Processes that m...

A general dimensionless rainfall depth-duration-ferquency relationship