Levee damage and revetment erosion by the 2019 Typhoon Hagibis in the Chikuma River, Japan
| Autor: | Takeshi Kodaka, Yutaka S. Sato, Satoru Ohtsuka, Toshio Sugii, Kenichi Maeda, Takahiro Yoshikawa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
geography
geography.geographical_feature_category Hydraulics Shoal Typhoon Hagibis Engineering geology. Rock mechanics. Soil mechanics. Underground construction Geotechnical Engineering and Engineering Geology Overtopping law.invention Bridge scour Revetment Inland flood Geomechanics law Levee Collapse Typhoon Erosion Levee TA703-712 Geotechnical engineering Geology Civil and Structural Engineering |
| Zdroj: | Soils and Foundations, Vol 61, Iss 4, Pp 1172-1188 (2021) |
| ISSN: | 0038-0806 |
| Popis: | Due to Typhoon Hagibis (Typhoon No. 19) in October 2019, also known as the Reiwa 1 East Japan Typhoon, many parts of the Chikuma River’s levee in Nagano Prefecture were damaged. There were instances of levee collapse due to overtopping, and an electric railway bridge also collapsed when an eroded revetment broke. In the present study, these disasters were investigated. The investigation considered both the geology - geomechanics and the hydraulics of the levee collapse due to overtopping. The results suggest that the most significant factor in the collapse of the levee was structural weakness. There were cases in which the tenacity of a levee was improved by taking simple measures against seepage. It was found that the bridge abutments washed away mainly because the river levee became a water-colliding front due to changes in the water route following the erosion of a sandbar in the process of river level decline after the peak. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|