Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China
AbstractSlopes facing reservoir water often collapse, affecting reservoir capacity. It is important to understand the factors affecting such collapses and predict the locations of collapse after impoundment for practical purposes. However, the mechanism of bank collapse in mountainou...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
GeoScienceWorld
2022-01-01
|
| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/6427717/611067/Influence-of-Wind-Generated-Wave-Action-on |
| _version_ | 1828314350125842432 |
|---|---|
| author | Xuan Zhang Qingxiang Meng Faming Zhang |
| author_facet | Xuan Zhang Qingxiang Meng Faming Zhang |
| author_sort | Xuan Zhang |
| collection | DOAJ |
| description |
AbstractSlopes facing reservoir water often collapse, affecting reservoir capacity. It is important to understand the factors affecting such collapses and predict the locations of collapse after impoundment for practical purposes. However, the mechanism of bank collapse in mountainous areas after reservoir impoundment remains unclear. To address this issue, field geotechnical property surveys, laboratory tests, and numerical simulations were employed to evaluate bank collapse susceptibility. The results showed that (i) bank collapse mainly occurs in slopes with a small cohesion and internal friction angle of less than 30°; (ii) the main effects of wave action on bank collapse are scour, erosion, and cyclic impact on the bank slope: wave erosion occurs in the bank slope with a wave height of less than 1.0 m, cohesion of less than 90 kPa, and slope angle of less than 30°, and wave impaction mainly occurs at the area with a wave height of more than 2.0 m and a slope angle of more than 30°; (iii) for valley reservoirs, softening of water on the slope rock and soil mainly reduces cohesion, which commonly occurs within 30 days; the cyclic action of wave impact load mainly damages the structure and reduces the internal friction angle. The influence of waves on bank collapse is mainly related to the wave height and wave velocity. The antiwave impact broken energy of rock and soil is an important index to evaluate whether bank collapse occurs in the long term, which is related to the strength, structure, and impact resistance. The present research is helpful to better understand the mechanism and evolution process of reservoir bank collapse. |
| first_indexed | 2024-04-13T16:43:59Z |
| format | Article |
| id | doaj.art-aa64ffb796814ace89ad4a981c2c5ef9 |
| institution | Directory Open Access Journal |
| issn | 1941-8264 1947-4253 |
| language | English |
| last_indexed | 2024-04-13T16:43:59Z |
| publishDate | 2022-01-01 |
| publisher | GeoScienceWorld |
| record_format | Article |
| series | Lithosphere |
| spelling | doaj.art-aa64ffb796814ace89ad4a981c2c5ef92022-12-22T02:39:09ZengGeoScienceWorldLithosphere1941-82641947-42532022-01-012021Special 410.2113/2022/6427717Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western ChinaXuan Zhang0http://orcid.org/0000-0003-1152-9957Qingxiang Meng1Faming Zhang2http://orcid.org/0000-0002-7019-8257State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China hhu.edu.cnKey Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing Jiangsu 210024 China hhu.edu.cnInstitute of Engineering Geology and Geohazards Hohai University Nanjing 210098 China hhu.edu.cn AbstractSlopes facing reservoir water often collapse, affecting reservoir capacity. It is important to understand the factors affecting such collapses and predict the locations of collapse after impoundment for practical purposes. However, the mechanism of bank collapse in mountainous areas after reservoir impoundment remains unclear. To address this issue, field geotechnical property surveys, laboratory tests, and numerical simulations were employed to evaluate bank collapse susceptibility. The results showed that (i) bank collapse mainly occurs in slopes with a small cohesion and internal friction angle of less than 30°; (ii) the main effects of wave action on bank collapse are scour, erosion, and cyclic impact on the bank slope: wave erosion occurs in the bank slope with a wave height of less than 1.0 m, cohesion of less than 90 kPa, and slope angle of less than 30°, and wave impaction mainly occurs at the area with a wave height of more than 2.0 m and a slope angle of more than 30°; (iii) for valley reservoirs, softening of water on the slope rock and soil mainly reduces cohesion, which commonly occurs within 30 days; the cyclic action of wave impact load mainly damages the structure and reduces the internal friction angle. The influence of waves on bank collapse is mainly related to the wave height and wave velocity. The antiwave impact broken energy of rock and soil is an important index to evaluate whether bank collapse occurs in the long term, which is related to the strength, structure, and impact resistance. The present research is helpful to better understand the mechanism and evolution process of reservoir bank collapse.https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/6427717/611067/Influence-of-Wind-Generated-Wave-Action-on |
| spellingShingle | Xuan Zhang Qingxiang Meng Faming Zhang Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China Lithosphere |
| title | Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China |
| title_full | Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China |
| title_fullStr | Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China |
| title_full_unstemmed | Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China |
| title_short | Influence of Wind-Generated Wave Action on Mountain Reservoir Bank Collapse: A Case Study at the Lancang River, Western China |
| title_sort | influence of wind generated wave action on mountain reservoir bank collapse a case study at the lancang river western china |
| url | https://pubs.geoscienceworld.org/lithosphere/article/2021/Special%204/6427717/611067/Influence-of-Wind-Generated-Wave-Action-on |
| work_keys_str_mv | AT xuanzhang influenceofwindgeneratedwaveactiononmountainreservoirbankcollapseacasestudyatthelancangriverwesternchina AT qingxiangmeng influenceofwindgeneratedwaveactiononmountainreservoirbankcollapseacasestudyatthelancangriverwesternchina AT famingzhang influenceofwindgeneratedwaveactiononmountainreservoirbankcollapseacasestudyatthelancangriverwesternchina |