| 摘要: |
| 岛礁地形是一种特殊的海岸形式，国内外学者对波浪在岛礁地形上的传播变形研究较多，但对于岛礁地形上的护岸工程研究较少，缺乏对关键设计参数的认识。为此，本文以马尔代夫机场岛护岸工程为例，通过波浪水槽物理模型试验，模型比尺选用1:10，研究了三种不同的岸坡宽度，在四种不同水深和波浪组合工况下的护面块石的稳定性。试验结果表明，前沿岸坡宽度，即护岸坡脚至礁缘之间的距离，是影响抛石护岸稳定性的重要因素，在同样水深、波况以及护岸块石重量条件下，护面块石的失稳率随岸坡宽度的增加而依次减小。对试验结果的进一步分析表明，为保障护岸安全，抛石护岸外坡坡脚宜布置于波浪破碎点之后，且与破碎点之间的距离建议不小于0.26倍的礁坪浅水波长。这一关键设计参数对今后同类护岸工程的设计具有重要的指导意义。 |
| 关键词: 岛礁 抛石护岸 稳定性 岸坡宽度 模型试验 |
| DOI： |
| 分类号:TV139.2 |
| 基金项目:国家重点研发计划资助(2018YFC0407503)；国家自然科学基金面上项目(51579156)；南京水利科学研究院中央级公益性科研院所基本科研业务费专项资金重大项目(Y218006)、重点项目(Y218005)。 |
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| Experimental study on stability of the riprap revetment on Fringing reefs |
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Liu Qingjun1, Zhang Jinxun2, Sun Tianting1, Xu Hua1, Wang Dengting1, Li Qin2
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1.Nanjing Hydroulic Research Institute;2.Beijing Urban Construction Group Co.LTD
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| Abstract: |
| Fringing reef is a special coastal topography. Domestic and foreign scholars have studied the propagation and deformation of waves on the fringing reefs, but there are few researches on revetment engineering on fringing reefs, and lack of understanding of key design parameters. To this end, this paper carries out an experiental study on revetment project based on the the Maldives Airport Island revetment project. The physical model scale is 1:10, and the stability of armour rock with three different bank widths, four different water depths and wave combinations was studied by experiments carried out in a two-dimensional wave tank in the laboratory. The test results show that the bank width, that is, the distance between the toe of the riprap revetment slope and the reef edge, is an important factor affecting the stability of riprap revetment. Under the same water depth, wave condition and weight of armour rocks, the instability rate of revetment blocks decreases with the increase of the distance between the toe of the riprap revetment slope and the reef edge. Further analysis of the test results shows that, in order to ensure the safety of revetment, the toe of slope outside riprap revetment should be arranged after the breaking point of wave, and the distance between the toe of the slope and the breaking point is recommended not to be less than 0.26 times the shallow water wave length of reef flat. This key design parameter has important guiding significance for the design of similar revetment projects in the future. |
| Key words: Fringing reef Riprap revetment Stability Bank width Model test |
