2011.4-2012.3 Yearbook of NILIM
Research Summary
River Department
| Reference Number | Y110301 |
| Title | Research on improvement of the estimation method of flowing capacity in estuary zone |
| Start-End Date | 2009.4-2012.3 |
| Division | River Division |
| Author | Head, Atsushi HATTORI Researcher, Yoshinori TAKEUCHI |
| Summary | After channel widening in estuary, we found that the changes of cross-sectional river-chnnel shapes can be classified into 2 types, 1) river bed changes uniformly, 2) channel narrowing by forming natural-levee. The larger the water depth becomes, type 1) appears, and the smaller the one becomes, the other type appears. Then, we compared the fluvial conditions relating deposition of fine grain materials before and after channel widening. At the same discharge, friction velocity after widening becomes smaller than the one before. So the likelihood of the occurence of fine sediment deposition in estuary zone becomes larger than before. |