Experimental Investigation of Irregular Wave Uplift Force on Deck of Exposed High-Pile Jetties   总被引：1，自引：0，他引：1  

陈国平  孟艳秋  严士常 《中国海洋工程》2010,24(1):67-78

A laboratory setup was developed to investigate irregular wave uplift loads on exposed high-pile jetties.It is shown that the dimensionless uplift load increases to the maximum with an increasing relative clearance and then decreases.The relative clearance corresponding to the peak force is linked to a range from 0.4 to 0.8.When the relative clearance exceeds a certain value,the wave can not reach the underside of the deck and the force becomes zero.Distinct trends of dimensionless force with a relative width of deck show that the force tends to decrease as the relative deck width increases,and then the decrease slows down after the relative deck width increases or decreases to a certain value.The pressure distribution length associated with the maximum uplift force is equivalent to the wave contact width x.When x is larger than the width of deck B,it is taken as B.The statistical distribution of loads obeys the Weibull distribution.The results from the analyses of the real data suggest a new dimensionless prediction model on wave-in-deck uplift loads and the conversion ratio between wave loads at different exceedance probabilities.A comparison is made between the new prediction model and the existing widely used three prediction models.These results are used as useful references for structural design of the jetty.  相似文献   

Predictions on Irregular Wave run-up and Overtopping     

陈国平  严士常  周益人 《海洋工程》2010,(3):481-498

A series of hydraulic model tests are carried out to investigate random wave run-up and overtopping on smooth, impermeable single slope and composite slope. Based on analysis of the influences of wave steepness, structure slope, incident wave angle, width of the berm and water depth on the berm and the wave run-up, empirical formulas for wave run-up on dike are proposed. Moreover, empirical formula on estimating the wave run-up on composite slope with multiple berms is presented for practical application of complex dike cross-section. The present study shows that the influence factors for wave overtopping are almost the same as those for wave run-up and the trend of the wave overtopping variation with main influence parameters is also similar to that for wave run-up. The trend of the wave overtopping discharge variations can be well described by two main factors, i.e. the wave run-up and the crest freeboard of the structure. A new prediction method for wave overtopping discharge is proposed for random waves. The proposed prediction formulas are applied to case study of over forty cases and the results show that the prediction methods are good enough for practical design purposes.  相似文献   

堆石防波堤不规则波浪反射系数试验研究     

房伟  陈国平  严士常  钟雄华  王聪 《海洋工程》2017,35(5):125-131

结合物理模型试验,分析斜坡坡度、波陡、相对水深、护面类型和破波参数等因素对堆石防波堤不规则波浪反射系数的影响规律。将常用的Van der Meer公式,Seelig公式,Postma公式和Davison公式计算值和实测值进行比较,并结合试验数据,基于有效波高和平均周期定义的Iribarren数,得出堆石防波堤不规则波浪反射系数经验公式。结果表明,该公式能较好地计算不规则波作用下块石和扭王块体护面堆石防波堤波浪反射系数。  相似文献   

不规则波作用下垂直挡板式透空堤透浪系数试验研究     

邵杰  陈国平  严士常  杨嵚 《海洋工程》2016,34(1):50-57

垂直挡板式透空堤作为一种新型的透空式防波堤结构,通过将挡浪板垂直设置于波能最集中的水体表层来消减波浪,透浪系数是其最关键的指标。通过物理模型试验,分析不规则波作用下入射波高、波周期、挡板相对入水深度、相对堤宽、相对挡板超高、相对面板超高等因素对垂直挡板式透空堤透浪系数的影响规律,并在Wiegel公式的基础上拟合了垂直挡板式透空堤透浪系数的计算公式。可作为今后类似透空式防波堤结构透浪系数的近似估算,具有一定的参考价值。  相似文献   

双挡板透空堤透浪与反射系数实验研究     

范骏  王宇楠  杨斯汉  严士常  王伟  钱学生 《海洋工程》2011,29(4):60-67

设有挡浪板结构的透空式防波堤适用于水深较大的海域,且具有较好的消浪效果。采用物理模型试验,探究具有双侧挡浪板结构的透空式防波堤透浪系数与反射系数的影响因素与规律,研究包括外侧与内侧挡浪板入水深度,水平板板宽,结构上部挡浪墙的高度与位置,水平板超高与波浪要素等因素。通过比较各家透浪系数的理论计算公式与实验结果,进行透浪系数的计算方法研究,给出修正Wiegel公式拟合双侧挡浪板透空式防波堤的透浪系数计算公式,供工程设计参考与进一步研究。  相似文献   

不同间距大直径圆筒防波堤波压力试验研究     

刘远超  刘晨  徐宇航  陈国平  严士常 《海洋工程》2018,36(2):56-63

通过开展物理模型试验,进行不规则波作用下不同间距大直径圆筒防波堤的波峰压力分布规律研究,分析了圆筒相对间距、相对水深、波陡等主要影响因素对圆筒波压力的影响规律,并通过波压力试验值与各家理论公式计算值的比较,进行不同间距圆筒波压力的计算方法研究。基于直立墙结构和大尺度孤立墩柱结构波压力公式给出修正系数以及横向衰减函数的拟合公式,用以计算圆筒周身不同位置处的波压力,从而为工程设计和理论研究提供参考。  相似文献   

复合坡度珊瑚礁地形上波浪破碎的试验研究          下载免费PDF全文

诸裕良  宗刘俊  赵红军  严士常  虞琦 《水科学进展》2018,29(5):717-727

通过波浪水槽试验,研究了珊瑚礁地形上规则波的破碎特征,包括破碎类型、破碎波高、破碎位置以及破碎带宽度。试验在带礁缘的复合坡度断面下进行,测试了两种水位下系列波高和波周期相组合的工况。试验研究了波浪破碎类型的区分标准,评估了已有四类破碎指标在复合坡度珊瑚礁地形上的适用性,并给出了描述破碎位置和破碎带宽度的经验公式。结果表明:礁边水深深水波高比可较好地区分波浪的破碎类型;四类破碎指标关系式中以破碎波高深水波高比之于深水波陡的相关性为最优;深水波高和礁边水深是影响破碎位置和破碎带宽度的主要因素,随着深水波高礁边水深比的增大,量纲一破碎位置（破碎点与礁边的距离和礁边处浅水波长的比值）逐渐减小,量纲一破碎带宽度（破碎带宽度和礁边浅水波长的比值）逐渐增大。  相似文献