STUDY ON UNDERSTANDING OF SAND MOVEMENT RANGE AND PATH IN TOPOGRAPHIC CHANGE PROCESS BY COLORED SAND TRACKING

Abstract

 In the experiment investigating the sand movement, the topographic changes by the successive wave for a certain time were measured and the change process and volume were analyzed. However, there are few experiments grasping the topographic changes with the sand movement in detail. It is difficult to say that the sand movement process to the topographic change is understood adequately. In this study, simultaneous measurement of topographic change and sand movement was carried out by colored sand tracking to investigate the detailed sand movement process in the initial stage of the topographic change. As a result, the sand movement per wave action was confirmed using colored sand coverage ratio. By analyzing the mixing situation of colored sand under the bottom surface, the sand movement was confirmed at the locations where the colored sand movement was not measured by the coverage ratio. These experimental results showed the sand movement range and its path which were difficult to catch by only the measurement of topographic change.