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It is crucial to understand and predict how the water and sediment flow in mountain channels for better disaster risk management. Detailed and quantitative measurement of channel and stream-bed structure is in great demand. In this paper, the utility of greenwavelength TLS for measurement of submerged stream-bed is preliminary examined in a steep mountain channel. The ability of through water measurement is evaluated in terms of water depth and flow velocity. Automated extraction of submergeddoi:10.5194/isprsannals-ii-5-w2-187-2013 fatcat:qn3uhixambemjcdlupwu6g5woq