Barrier dynamics experiment (BARDEX): Aims, design and procedures

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• 作者：J.J. Williams^a ; ^{jwilliams@abpmer.co.uk} ; D. Buscombe^b ; G. Masselink^b ; ^{g.masselink@plymouth.ac.uk} ; I.L. Turner^c ; ^{ian.turner@unsw.edu.au} ; C. Swinkels^d ; ^{Cilia.Swinkels@deltares.nl}
• 关键词：Gravel barrier ; Delta flume ; Waves ; Tides ; Prototype scale experiment
• 刊名：Coastal Engineering
• 出版年：2012
• 期刊代码：10_03783839
• 类别：civ
• 出版时间：May, 2012
• 卷：63
• 期：Complete
• 页码：3-12
• 文件大小：1637 K

摘要

Although relatively common features in nature, only a handful of laboratory studies have examined the dynamic response of gravel beaches and barriers to combined tidal and wave forcing and to storm simulations. This paper reports experiments undertaken in the Delta flume during the BARDEX project using a prototype gravel barrier (55 m-long, 5 m-wide and 4 m-high with seaward and lagoon facing slopes of 1 V/8H and 1 V/4H, respectively) composed of sub-rounded gravel (D₅₀ = 11 mm). Hydrodynamic conditions and beach morphology were measured using buried PTs, ECMs and closely spaced bed location sensors on a scaffold frame spanning the entire barrier. Additional measurements were also obtained from video and from instruments on an offshore frame. A series of systematic tests were undertaken using pumps to change water levels on the seaward (h_S) and lagoon (h_L) sides of the barrier. These included: 1) hydraulic conductivity tests where h_S and h_L levels were varied; 2) tests to assess the impact of waves (h_S = 2.5 m, variable h_L in the range 1 m to 2.5 m, significant wave height, H_s = 0.8 m, and peak wave period, T_p = 3.0 s, 4.5 s and 6 s); 3) tests examining the effect of tides (varying h_S from 1.75 m to 3.25 m, variable h_L at high (h_L = h_S + 1 m), medium (h_L = h_S) and low (h_L = h_S 鈭?#xA0;1 m) levels, H_s = 0.8 m and T_p = 4.5 s); and 4) overwash tests (tidal simulation, variable h_L, H_s = 1 m and T_p = 4.5 s, 6 s, 7 s and 8 s). The principal objective of the paper is to provide essential information on the design and execution of the BARDEX experiments referred to in the series of papers that follow in this special edition. It also describes the instrumentation used to measure hydrodynamic, morphodynamic and sediment processes.