缓坡沙坝地形平均沿岸流双峰特征实验研究

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大连海事大学学报 ›› 2021, Vol. 47 ›› Issue (2) : 63-70.

船舶与海洋工程

缓坡沙坝地形平均沿岸流双峰特征实验研究

王彦^*1, 邹志利²

作者信息 +

Experimental study on bimodal characteristics of mean longshore current over gentle slope barred beaches

WANG Yan^*1, ZOU Zhi-li²

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文章历史 +

摘要

为明晰沙坝地形沿岸流特征，通过对两个坡度沙坝地形不同周期情况的沿岸流实验，研究平直沙坝地形不同周期情况下平均沿岸流速度分布的双峰特征，重点分析双峰值特征及其比值，并考虑周期对平均沿岸流双峰速度分布特征的影响. 结果表明：沙坝地形平均沿岸流速度分布具有双峰特征，分别λ于沙坝向岸侧面的中部和靠近岸线处；在同一沙坝地形情况，沿岸流速度分布两峰值出现的λ置是不变的，周期的增大也不会改变速度双峰值的λ置，但增大了二峰值的比值，主要表现在速度第二峰值的增大. 了解沙坝地形沿岸流特征有助于近岸污染物扩散、泥沙输运和海岸地ò的研究

Abstract

In order to clarify the characteristics of longshore current in barred beach topography, the characteristics of bimodal profiles of the mean longshore current velocity profiles in different periods along the barred beaches were studied by the longshore current experimental measurements of two slope barred beach with different period. The characteristics and ratios of the bimodal values were mainly analyzed, and the influence of the period on the bimodal velocity distribution characteristics of the mean longshore current was considered. The results show that the average longshore current velocity distribution of barred beach topography has bimodal characteristics, the first peak occurs in the middle of the shore facing side of the barred beach, and the second peak occurs near the shoreline; for the same barred beach topography, the positions of the two peaks of longshore current velocity distribution are fixed. The increase of the period can not change the position of the double peak value of the velocity, but can increase the ratio of the two peak values, which is mainly manifested in the increase of the second peak value of the velocity. It should be helpful for the study of pollutant diffusion, sediment transport and coastal geomorphology.

导出引用

王彦，邹志利. 缓坡沙坝地形平均沿岸流双峰特征实验研究[J]. 大连海事大学学报. 2021, 47(2): 63-70

WANG Yan, ZOU Zhi-li. Experimental study on bimodal characteristics of mean longshore current over gentle slope barred beaches[J]. Journal of Dalian Maritime University. 2021, 47(2): 63-70

参考文献

[1]王翠, 郭晓峰, 方婧, 李青生.闽浙沿岸流扩展范Χ的季节特征及其对典型海湾的影响[J].应用海洋学学报, 2018, 37(01):1-8 [2]靳姗姗, 孙俊川, κ泽勋.渤海沿岸流季节变化对青岛冷水团影响的初步分析[J].海洋科学进展, 2017, 35(03):317-328 [3]薛春汀, 张勇.中国近岸海区沿岸流和海岸流对沉积物的搬运[J].海洋地质与第四纪地质, 2010, 30(01):1-7 [4]Longuet-Higgins M S, Stewart R W.Radiation stresses in water waves; a physical discussion with applications[J].Deep Sea Research and Oceanographic Abstracts, 1964, 11(4):529-562 [5]Thornton E B, Guza R T.Surf zone longshore currents and random waves: Field data and models[J].J. Physical Oceanography, 1986, 16:1165-1178 [6]Church J C, Thornton E B.Effects of Breaking Wave Induced Turbulence within a Longshore Current Model[J].Coastal Engineering, 1993, 20(1-2):1-28 [7]Visser P J.Laboratory Measurements of Uniform Longshore Currents[J].Coastal Engineering, 1991, 15(5-6):563-593 [8]沈良朵, 邹志利, 唐志波, 倪云林, 陈维.缓坡海岸平均沿岸流实验研究与数值模拟[J].船舶力学, 2016, 20(08):973-982 [9]Birkemeier W A.Delilah nearshore processes experiment: Data summary, miscellaneous reports. Coastal Eng. Res. Cent., Field Res. Facil., U.S. Army Eng. Waterw. Exp. Sta., Vicksburg, Miss, 1991. [10]Castelle B, Bonneton P, Sénéchal N, et al.Dynamics of Wave-Induced Currents over an Alongshore Non-Uniform Multiple-Barred Sandy Beach on the Aquitanian Coast, France[J].Continental Shelf Research, 2006, 26(1):113-131 [11]Rogers A L, Ravens T M.Measurement of Longshore Sediment Transport Rates in the Surf Zone on Galveston Island, Texas[J].Journal of Coastal Research, 2008, 24(2B):62-73 [12]Reniers A J H M, Battjes J A.A laboratory study of longshore currents over barred and non-barred beaches[J].Coastal Engineering, 1997, 30:1-22 [13]Hamilton D G, Ebersole B A.Establishing Uniform Longshore Currents in a Large-Scale Sediment Transport Facility[J].Coastal Engineering, 2001, 42(3):199-218 [14]Ren C, Zou Z, Qiu D.Experimental Study of the Instabilities of Alongshore Currents on Plane Beaches[J].Coastal Engineering, 2011, 59(1):72-89 [15]沈良朵.缓坡沿岸流不稳定性特征研究[D]. 大连: 大连理工大学, 2015. [16]Dalrymple R A, Eubanks R A, Birkemeier W A.Wave-Induced Circulation in Shallow Basins[J].Journal of the Waterway Port Coastal and Ocean Division, 1977, 103(1):117-135