FLOOD INUNDATION ASSOCIATED WITH SUSPENDED SEDIMENT RUNOFF AND BED DEFORMATION DURING HEAVY RAINFALL –A CASE STUDY FOR THE ‘YONA’ FLOOD IN THE SHIRA RIVER-

DOI Web Site 2 References

Bibliographic Information

Other Title
  • 豪雨時の浮遊砂の流出と河床変動に伴う洪水氾濫 －白川のヨナ洪水を例に－

Abstract

<p> When huge amounts of sediment are produced in upstream areas during heavy rainfall events, they can be transported to downstream and contribute to flood damage in downstream areas. In this study, a sediment discharge model and two-dimensional flood flow analysis were used to calculate floods with large amounts of suspended sediment in the Shira River in Kumamoto Prefecture, which is located in the upper reaches of the Aso Caldera, to investigate the effects of large amounts of suspended sediment deposition in the river channel on flood inundation. The results of the sediment discharge calculations show that, due to the difference of bed slope between the upper reaches of the Shira River and the Kurokawa River, a large amount of suspended sediment flows into the lower reaches of the Shira River before the peak flow is reached. According to the results of the 2D flood flow computation, these sediments are deposited in areas where the sediment transport capacity of the river channel is relatively small, that contributes to the inundation.</p>

Journal

References(2)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top