Abstract
For comprehensive managements for marine debris including inland area which is known to be a source of marine debris, it is necessary to monitor the behavior of floating-litter in rivers and coasts. In the present study, we presented an automatic and continuous monitoring technique for floating-litter transport L in rivers by using a video image monitoring and a new image processing technique. In this technique, image pixels of floating-litter are detected using spatial gradient of image colors P’ larger than a threshold value P’ th which is related to image colors in pixels of no floating-litter. The results indicated that L evaluated by the technique gave good agreement with the observed data in several floods in the Edogawa River, demonstrating the fundamental performance of the present technique.
