波流作用下淹没圆柱局部冲深影响因素分析

程永舟; 吕行; 王文森; 黄筱云; 夏波

doi:10.16198/j.cnki.1009-640X.2019.06.008

波流作用下淹没圆柱局部冲深影响因素分析

doi: 10.16198/j.cnki.1009-640X.2019.06.008

程永舟^1,2,,
吕行¹,
王文森¹,
黄筱云^1,2,
夏波^1,2

1.
长沙理工大学水利工程学院, 湖南长沙 410114
2.
水沙科学与水灾害防治湖南省重点实验室, 湖南长沙 410114

基金项目:

国家自然科学基金面上项目 51679015

湖南交通科技项目 201822

详细信息

作者简介:
程永舟(1974—)，男，湖北广水人，教授，博士，主要从事河流海岸动力学及泥沙运动方面研究。E-mail：chengyongzhou@163.com

中图分类号: TV148

Research on the influencing factors of scour depth around submerged cylinder under combined action of wave and current

1.
School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China
2.
Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China

摘要: 淹没圆柱在海洋工程中运用广泛，局部冲刷对此类建筑物的安全有较大影响。为掌握该类型建筑物在波流作用下的冲刷特性，在波流水槽内开展了一系列试验研究。试验将圆柱模型安装在波流水槽中部的沙槽内，沙槽内铺设中值粒径0.22 mm的无黏性沙，形成平底海床。试验中圆柱处于淹没情况，改变入射波流条件，观测多种波流作用下，不同高度淹没圆柱周围的局部冲刷深度发展过程，分析了多种无量纲参数对局部冲刷深度的影响。结果表明：当KC数不变时，冲刷深度s/D随着相对流速U_cw和Fr的增大而增大，当Fr增大到一定程度时(Fr>0.80)，冲刷深度s/D趋于稳定; U_cw在固定范围内时，冲刷深度s/D随KC数的增加而增加，增长速率逐渐变慢; 引入淹没因子K_s，得到了淹没圆柱与非淹没圆柱的冲刷深度计算关系式。
- 淹没圆柱 /
- 波流共同作用 /
- 冲刷深度 /
- 局部冲刷
Abstract: Submerged cylinders are widely used in marine construction. Local scour has a great impact on the safety and stability of such buildings. In order to understand the scour characteristics of this type of building under wave and current, a series of scour experiments were carried out in the wave-current flume. The model was installed in a flat sand box in the middle of the wave-current flume, of which the surroundings were covered with non-cohesive sand of median diameter 0.22 mm. The water level is always set as submergence situation. The condition of incident wave and current was changed to observe the local scour development process around the submerged cylinder with various heights. The local scour depth was measured and recorded. A variety of dimensionless parameters were applied to analyze the data and assess their influence on the scour. The result shows that when KC number is fixed, the relative scour depth s/D increases with the relative flow velocity U_cw and Fr. When Fr increases to a certain extent (Fr>0.80), s/D tends to be stable; when U_cw is in a fixed range, depth s/D increases with KC number, and the growth rate gradually becomes slower. The submergence factor K_s gives the relationship between the scour depth of the submerged cylinder and that of the non- submerged one.
- submerged cylinder /
- combined action of wave and current /
- scour depth /
- local scour

图 1 试验布置

Figure 1. Experimental layout

下载: 全尺寸图片幻灯片

图 2 冲刷准平衡地形

Figure 2. Quasi-equilibrium scour topography

下载: 全尺寸图片幻灯片

图 3 相对冲刷深度s/D与U_cw的关系

Figure 3. Relationship between s/D and U_cw

下载: 全尺寸图片幻灯片

图 4 相对冲刷深度s/D与KC数的关系

Figure 4. Relationship between s/D and KC

下载: 全尺寸图片幻灯片

图 5 相对冲刷深度s/D与Fr数的关系

Figure 5. Relationship between s/D and Fr

下载: 全尺寸图片幻灯片

图 6 相对冲刷深度s/D与淹没率S_r的关系

Figure 6. Relationship between s/D and S_r

下载: 全尺寸图片幻灯片

图 7 淹没因子K_s与淹没率S_r的关系

Figure 7. Relationship between K_s and S_r

下载: 全尺寸图片幻灯片

表 1 试验工况

Table 1. Experimental conditions

工况	S_r	H/m	T/s	U_c/(m·s^-1)	U_wm/(m·s^-1)	U_m/(m·s^-1)	U_cw	θ	KC	Fr	s/cm	s/D
1	0	0	0	0.220	0	0.220	1.000	0.027	—	0.176	5.4	0.338
2	0	0.050	1.0	0.220	0.073	0.293	0.751	0.044	0.456	0.234	5.9	0.369
3	0	0.090	1.0	0.220	0.131	0.351	0.627	0.067	0.819	0.280	6.5	0.403
4	0.2	0	0	0.220	0	0.220	1.000	0.027	—	0.176	4.4	0.275
5	0.2	0.050	1.0	0.220	0.073	0.293	0.751	0.044	0.456	0.234	5.3	0.331
6	0.2	0.090	1.0	0.220	0.131	0.351	0.627	0.067	0.819	0.280	5.9	0.369
7	0.4	0	0	0.160	0	0.160	1.000	0.014	—	0.128	0	0
8	0.4	0.050	1.0	0.160	0.073	0.233	0.687	0.031	0.456	0.186	1.4	0.088
9	0.4	0.090	1.0	0.160	0.131	0.291	0.550	0.054	0.819	0.232	1.9	0.119
10	0.4	0.130	1.0	0.160	0.189	0.349	0.458	0.084	1.181	0.279	2.1	0.131
11	0.4	0	0	0.220	0	0.220	1.000	0.027	—	0.176	3.5	0.219
12	0.4	0.050	1.0	0.220	0.073	0.293	0.751	0.039	0.456	0.234	4.6	0.288
13	0.4	0.070	1.0	0.220	0.102	0.322	0.683	0.054	0.638	0.257	5.1	0.319
14	0.4	0.090	1.0	0.220	0.131	0.351	0.627	0.067	0.819	0.280	5.5	0.344
15	0.4	0.110	1.0	0.220	0.160	0.380	0.579	0.081	1.000	0.303	5.2	0.325
16	0.4	0.130	1.0	0.220	0.189	0.409	0.538	0.097	1.181	0.326	4.8	0.300
17	0.4	0.090	0.8	0.220	0.087	0.307	0.717	0.051	0.435	0.245	4.4	0.272
18	0.4	0.090	1.2	0.220	0.158	0.378	0.582	0.075	1.185	0.302	5.2	0.325
19	0.4	0	0	0.260	0	0.260	1.000	0.037	—	0.208	6.9	0.431
20	0.4	0.050	1.0	0.260	0.073	0.333	0.781	0.052	0.456	0.266	7.5	0.469
21	0.4	0.090	1.0	0.260	0.131	0.391	0.665	0.077	0.819	0.312	7.8	0.488
22	0.4	0.130	1.0	0.260	0.189	0.449	0.579	0.107	1.181	0.358	7.6	0.475
23	0.4	0.050	1.0	-0.220	0.073	0.293	1.497	0.039	0.456	0.234	3.8	0.238
24	0.4	0.090	1.0	-0.220	0.131	0.351	2.472	0.067	0.819	0.280	4.3	0.269
25	0.6	0	0	0.220	0	0.220	1.000	0.027	—	0.176	2.4	0.150
26	0.6	0.050	1.0	0.220	0.073	0.293	0.751	0.044	0.456	0.234	3.7	0.231
27	0.6	0.090	1.0	0.220	0.131	0.351	0.627	0.067	0.819	0.280	4.3	0.269
28	0.8	0	0	0.220	0	0.220	1.000	0.027	-	0.176	1.5	0.091
29	0.8	0.050	1.0	0.220	0.073	0.293	0.751	0.044	0.456	0.234	2.5	0.156
30	0.8	0.090	1.0	0.220	0.131	0.351	0.627	0.067	0.819	0.280	3.0	0.188

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波流作用下淹没圆柱局部冲深影响因素分析

doi: 10.16198/j.cnki.1009-640X.2019.06.008

作者简介: 程永舟(1974—)，男，湖北广水人，教授，博士，主要从事河流海岸动力学及泥沙运动方面研究。E-mail：chengyongzhou@163.com

Research on the influencing factors of scour depth around submerged cylinder under combined action of wave and current

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出版历程

作者简介:
程永舟(1974—)，男，湖北广水人，教授，博士，主要从事河流海岸动力学及泥沙运动方面研究。E-mail：chengyongzhou@163.com