|
|
Hokkaido University Collection of Scholarly and Academic Papers >
Theses >
博士 （工学） >
扇状地河川の破堤機構及び定量的評価に関する研究
|
Files in This Item:
|
|
|
Related Items in HUSCAP:
|
| Title: | 扇状地河川の破堤機構及び定量的評価に関する研究 |
| Other Titles: | Study on Mechanism and Quantitative Evaluation of Levee Breach in Alluvial River |
| Authors: | 柿沼, 孝治 Browse this author |
| Issue Date: | 25-Mar-2014 |
| Publisher: | Hokkaido University |
| Abstract: | This study basically consists of four parts, the present situation of researches forriverine breach, outline of the large-scale breach experiment, the result of the experiment,and the numerical breach model. In this study, the author performed large-scaleexperiments of overtopping breach using an experimental flume located on the floodwayof the Tokachi River to clarify the mechanism of riverine levee breach, and proposes anew numerical model. By taking advantage of the scale of the flume, the levee breachprocess was monitored with state-of-the-art observation devices under highly precisehydraulic conditions. Four test cases were done with variations of inflow rate, leveematerial and levee shape. In these tests, the levee breach monitored quantitatively usingacceleration sensors installed in the levee body. From the results of the experiments, theauthor categorized the breach process into four stages, focusing on the breach progress andhydraulic characteristics, and also found out that the correlation between the breachedvolume and the hydraulic quantities, such as velocity, water level and Shields number, canbe expressed by an equation similar to that for bed load transport. Next, the author appliedthe conventional two-dimensional numerical model, Nays-2D, for simulating the testresults and found that the model could well reproduce the overflow rates, but could notwell reproduce the breach widening speed. Then the author modified the model byintegrating the experiment results into geomechanics of the model, and obtained a fineresult of reproducing the breach widening speed. Finally the author applied the modifiedmodel for the breach of the Yabe River which occurred in September 2013, and obtained afine result of reproducing the breach widening speed. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 乙第6920号 |
| Degree Level: | 博士 |
| Degree Discipline: | 工学 |
| Examination Committee Members: | (主査) 教授 清水 康行, 教授 泉 典洋, 准教授 渡部 靖憲 |
| Degree Affiliation: | 工学院（環境フィールド工学専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/55608 |
| Appears in Collections: | 学位論文 (Theses) > 博士 （工学）
論文博士 (Doctorate by way of Dissertation) > 工学院(Graduate School of Engineering)
|
|
