Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions
Current-induced local scour around pile groups weakens the capacity of structures. In this paper, experimental tests of local scour around an array of 5 × 5 pile groups were conducted in a steady current in a hydraulic flume. The pile-to-pile space was five times the diameter of a single pile. All t...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/13/1/137 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832588240790487040 |
|---|---|
| author | Ming Gong Xinying Pan Shengtao Du Guoxiang Wu Yingxue Lv Yunjia Sun Guangjia Ding Bingchen Liang |
| author_facet | Ming Gong Xinying Pan Shengtao Du Guoxiang Wu Yingxue Lv Yunjia Sun Guangjia Ding Bingchen Liang |
| author_sort | Ming Gong |
| collection | DOAJ |
| description | Current-induced local scour around pile groups weakens the capacity of structures. In this paper, experimental tests of local scour around an array of 5 × 5 pile groups were conducted in a steady current in a hydraulic flume. The pile-to-pile space was five times the diameter of a single pile. All the tests were in clear-water scour conditions. The effects of upstream piles on the local scour characteristics of downstream piles, as well as the outer-arranged side piles on the inner-arranged piles, were studied within flow intensities of 0.37–1.0. Both the three-dimensional topography of bed elevation changes and the maximum temporal scour depths are discussed. The results showed that the minimum threshold of flow intensity that can induce local scour around the pile groups was 0.40. The scour holes were independent of each other, though a global scouring phenomenon occurred between piles at a flow intensity of 1.0. The temporal scour depths of the downstream piles increased slowly throughout the local scour processes. During the initial scouring stage, they accelerated rapidly. At flow intensities of 0.60, 0.80, and 1.0, the scour development then progressed gradually, resembling the behavior of a single pile. The developing scouring stage can hardly be distinguished in the case of flow intensity of 0.80. The maximum scour depths in the flow intensity of 0.60 showed irregular variations with increasing row and column numbers. The equilibrium scour depths in the central-positioned piles tended to a constant value of 0.5 times the pile diameter. In larger flow intensities of 0.80 and 1.0, they decreased linearly with pile row number, with the maximum scour depths at the piles in the first row. The local scour depths of the inner-positioned piles in the parallel arrangement showed few differences at the front and rear piles. |
| format | Article |
| id | doaj-art-e7000d8299594478a26e810ff39cf447 |
| institution | Kabale University |
| issn | 2077-1312 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj-art-e7000d8299594478a26e810ff39cf4472025-01-24T13:36:59ZengMDPI AGJournal of Marine Science and Engineering2077-13122025-01-0113113710.3390/jmse13010137Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour ConditionsMing Gong0Xinying Pan1Shengtao Du2Guoxiang Wu3Yingxue Lv4Yunjia Sun5Guangjia Ding6Bingchen Liang7College of Engineering, Ocean University of China, Qingdao 266100, ChinaCollege of Engineering, Ocean University of China, Qingdao 266100, ChinaCollege of Engineering, Ocean University of China, Qingdao 266100, ChinaCollege of Engineering, Ocean University of China, Qingdao 266100, ChinaKey Laboratory of Coastal Engineering Hydrodynamics, CCCC, Tianjin Port Engineering Institute Co., Ltd. of CCCC First Harbor Engineering Co., Ltd., Tianjin 300222, ChinaKey Laboratory of Coastal Engineering Hydrodynamics, CCCC, Tianjin Port Engineering Institute Co., Ltd. of CCCC First Harbor Engineering Co., Ltd., Tianjin 300222, ChinaKey Laboratory of Coastal Engineering Hydrodynamics, CCCC, Tianjin Port Engineering Institute Co., Ltd. of CCCC First Harbor Engineering Co., Ltd., Tianjin 300222, ChinaCollege of Engineering, Ocean University of China, Qingdao 266100, ChinaCurrent-induced local scour around pile groups weakens the capacity of structures. In this paper, experimental tests of local scour around an array of 5 × 5 pile groups were conducted in a steady current in a hydraulic flume. The pile-to-pile space was five times the diameter of a single pile. All the tests were in clear-water scour conditions. The effects of upstream piles on the local scour characteristics of downstream piles, as well as the outer-arranged side piles on the inner-arranged piles, were studied within flow intensities of 0.37–1.0. Both the three-dimensional topography of bed elevation changes and the maximum temporal scour depths are discussed. The results showed that the minimum threshold of flow intensity that can induce local scour around the pile groups was 0.40. The scour holes were independent of each other, though a global scouring phenomenon occurred between piles at a flow intensity of 1.0. The temporal scour depths of the downstream piles increased slowly throughout the local scour processes. During the initial scouring stage, they accelerated rapidly. At flow intensities of 0.60, 0.80, and 1.0, the scour development then progressed gradually, resembling the behavior of a single pile. The developing scouring stage can hardly be distinguished in the case of flow intensity of 0.80. The maximum scour depths in the flow intensity of 0.60 showed irregular variations with increasing row and column numbers. The equilibrium scour depths in the central-positioned piles tended to a constant value of 0.5 times the pile diameter. In larger flow intensities of 0.80 and 1.0, they decreased linearly with pile row number, with the maximum scour depths at the piles in the first row. The local scour depths of the inner-positioned piles in the parallel arrangement showed few differences at the front and rear piles.https://www.mdpi.com/2077-1312/13/1/137pile groupsflow velocityflow intensityscourmaximum scour depthbed elevation |
| spellingShingle | Ming Gong Xinying Pan Shengtao Du Guoxiang Wu Yingxue Lv Yunjia Sun Guangjia Ding Bingchen Liang Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions Journal of Marine Science and Engineering pile groups flow velocity flow intensity scour maximum scour depth bed elevation |
| title | Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions |
| title_full | Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions |
| title_fullStr | Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions |
| title_full_unstemmed | Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions |
| title_short | Laboratory Study of Local Scour Around an Array of Pile Groups in Clear-Water Scour Conditions |
| title_sort | laboratory study of local scour around an array of pile groups in clear water scour conditions |
| topic | pile groups flow velocity flow intensity scour maximum scour depth bed elevation |
| url | https://www.mdpi.com/2077-1312/13/1/137 |
| work_keys_str_mv | AT minggong laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT xinyingpan laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT shengtaodu laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT guoxiangwu laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT yingxuelv laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT yunjiasun laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT guangjiading laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions AT bingchenliang laboratorystudyoflocalscouraroundanarrayofpilegroupsinclearwaterscourconditions |