Effects of Natural and Artificial Impacts on a Stability of Alternating Bars in Rivers - towards Sustainable River Environment Management by Sediment Control

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420498
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Hydraulic engineering
• Research Institution: The University of Tokushima
• Principal Investigator: MUTO Yasunori 徳島大学, 大学院理工学研究部, 教授 (40263157)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 河道砂州 / 流砂 / 河床変動 / 河床表層土砂 / 洪水 / 河道整正 / 低水護岸 / 河道横断構造物

Outline of Final Research Achievements

Effects of natural and artificial impacts on a stability of sand bars in rivers were studied utilizing field survey data and laboratory experiments. The results show that artificial impacts such as dam construction and/or bank protection affect to some extent sand bar formation and its stability through changing not only sediment discharge but also its grain size constitution. In addition, flood frequency trend in recent years also changes both sediment yields and riverine vegetation growth/decay. This is deemed to cause extreme stabilization of sand bar, especially its bipolarization. The research outputs can be used as a fundamental information for developing a sediment control technique towards sustainable river environment restoration.

Free Research Field

水工学