ABSTRACT:

Rock mass surface and topographic bed under muddy water or in sediment-laden flow are often clouded by suspended or moving particles, which are hard to be detected for real-time analysis and visual observation for many actual geotechnical engineering projects. In this paper, a novel method is described for the visual detection and model reconstruction of underwater topography and rock mass surface by using B-mode ultrasonic imaging device. It automatically detects the imaging lines of topography and rock mass surface in the obtained ultrasonic images. These imaging lines are used to detect and reconstruct underwater topography and rock mass surface. Experimental results show rock mass and topography surface can be clearly detected, and the error of visual detection and model reconstruction for surface can be less than 1 mm during our model testing. This method can effectively neglect the imaging interference of moving or suspended particles on the detection of rock surface under muddy water or in sediment-laden flow. With the advantages of fast speed, high accuracy and real time of B-mode ultrasonic imaging device, this method is an effective approach of visual detection and model reconstruction for underwater topography and rock mass surface.

1. INTRODUCTION
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