Recent problems facing river management include a decrease in the water storage capacity of dam reservoirs due to sedimentation and a lack of continuity in sediment moment from the upper to lower reaches. To clarify the characteristics of substance transported during flooding, we made observations of and collected samples from the Saru River in Hokkaido, which has a reservoir in its middle reaches. In this area, a massive flood occurred between August 9 and 11, 2003. We also observed this particular flood. Since the scale of this flood was very large, we were unable to make observations throughout the duration of the flood. We were, however, able to conduct observations during the first half of the flood and at the end of the flood end. Here we report our observation results.
It is important to consider the bed load transportation for performing of river management works. Many researches on bed load transportation were conducted and many estimation methods about the amount of bed load transportation were proposed.However, it is very difficult to measure the bed load transportation in steep rivers and there are a lot of unknown portions on the behavior of large scale materials. Therefore, the experiments on behavior of large scale materials using high-speed hydraulic channel were conducted. Experimental measurements of bed load were compared with calculated values using several bed load equations (Meyer-Peter-Muller; Ashida and Michiue; Sato, Kikkawa and Ashida). It was found that the Sato-Kikkawa-Ashida equation produced calculations most closely in agreement with the experimental data.
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