Experimental study of wave dynamics in coastal wetlands

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• 作者：Melanie K. Truong ; Kerri A. Whilden ; Scott A. Socolofsky…
• 关键词：Wetland dynamics ; Vegetated mounds ; Wave breaking ; Vegetation damping
• 刊名：Environmental Fluid Mechanics
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：15
• 期：4
• 页码：851-880
• 全文大小：1,892 KB
• 参考文献：1.Asano T (2006) Wave attenuation and sediment deposition due to coastal vegetation. J Glob Environ Eng 11:29鈥?4
  2.Asano T, Matsumoto S, Kikuchu S (2005) Wave deformation in vegetation fringed channels. In: Proceedings of the 29th international conference on coastal engineering, Lisbon, vol. 1, pp 218鈥?29.
  3.Augustin LN, Irish JL, Lynett P (2009) Laboratory and numerical studies of wave damping by emergent and near-emergent wetland vegetation. Coast Eng 56:332鈥?40View Article
  4.Dalrymple RA, Kirby JT, Hwang PA (1984) Wave diffraction due to areas of energy dissipation. J Wtrwy Port Coast Oc Engrg 110(1):67鈥?9View Article
  5.D鈥橢rrico J (2004) inpaint nans.m: Interpolate NaN elements in a 2D array using non-NaN elements. MATLAB Central File Exchange. http://鈥媤ww.鈥媘athworks.鈥媍om/鈥媘atlabcentral/鈥媐ileexchange/鈥?551 Accessed 19 April 2011
  6.Dean GD, Dalrymple RA (1984) Water wave mechanics for engineers and scientists. World Scientific, Singapore
  7.Folkard AM (2005) Hydrodynamics of model Posidonia Oceanica patches in shallow water. Limnol Oceanogr 50(5):1592鈥?600View Article
  8.Goring D, Nikora V (2002) Despiking acoustic Doppler velocimeter data. J Hydraul Eng 128(1):117鈥?26View Article
  9.LaSalle MW, Landin MC, Sims JG (1991) Evaluation of the flora and fauna of a Spartina Alterniflora marsh established on dredged material in Winyah Bay, South Carolina. Wetlands 11(2):191鈥?08View Article
  10.Loder NM, Irish JL, Cialone MA, Wamsley TV (2009) Sensitivity of hurricane surge to morphological parameters of coastal wetlands. Estuar Coast Shelf S 84:625鈥?36View Article
  11.Mendez FJ, Losada IJ (2004) An empirical model to estimate the propagation of random breaking and nonbreaking waves over vegetation fields. Coast Eng 51:103鈥?18View Article
  12.Minello TJ (2000) Temporal development of salt marsh value for nekton and epifauna: utilization of dredged material marshes in Galveston Bay, Texas, USA. Wetl Ecol Manag 8:327鈥?41View Article
  13.Minello TJ, Webb JW Jr (1997) Use of natural and created Spartina Alterniflora salt marshes by fishery species and other aquatic fauna in Galveston Bay, Texas, USA. Mar Ecol-Prog Ser 151:165鈥?79View Article
  14.Mori N (2006) Despike package: 3D phase-space method. MACE Toolbox for Coastal Engineers. http://鈥媤ww.鈥媜ceanwave.鈥媕p/鈥媠oftwares/鈥媘ace/鈥媔ndex.鈥媝hp?鈥婱ACE%20鈥婼oftwares . Accessed 5 Nov 2010
  15.Mori N, Suzuki T, Kakuno S (2007) Noise of acoustic Doppler velocimeter data in bubbly flow. J Eng Mech-ASCE 133(1):122鈥?25View Article
  16.Nepf HM (1999) Drag, turbulence, and diffusion in flow through emergent vegetation. Water Resour Res 35(2):479鈥?89View Article
  17.Nepf HM (2004) Vegetated flow dynamics. In: Fagherazzi S, Marani M, Blum LK (eds) The ecogeomorphology of tidal marshes. American Geophysical Union, Washington D.C., pp 137鈥?63
  18.Noarayanan L, Murali K, Sundar V (2012) Performance of flexible emergent vegetation in staggered configuration as a mitigation measure for extreme coastal disasters. Nat Hazards 62:531鈥?50View Article
  19.Ravens TM, Thomas RC, Roberts KA, Santschi PH (2009) Causes of salt marsh erosion in Galveston Bay, Texas. J Coast Res 25(2):265鈥?72View Article
  20.Shafer DJ, Streever WJ (2000) A comparison of 28 natural and dredged material salt marshes in Texas with an emphasis on geomorphological variables. Wetl Ecol Manag 8:353鈥?66View Article
  21.Shafer DJ, Roland R, Douglass SL (2003) Preliminary evaluation of critical wave energy thresholds at natural and created coastal wetlands. WRP Technical Notes Collection (ERDC TN- WRP-HS-CP-2.2). Vicksburg, Mississippi: U.S. Army Engineer Research and Development Center. http://鈥媏l.鈥媏rdc.鈥媢sace.鈥媋rmy.鈥媘il/鈥媏lpubs/鈥媝df/鈥媓scp2-2 . Accessed 25 June 2012
  22.Streever WJ (2000) Spartina Alterniflora marshes on dredged material: a critical review of the ongoing debate over success. Wetl Ecol Manag 8:295鈥?16View Article
  23.Wamsley TV, Cialone MA, Smith JM, Atkinson JH, Rosati JD (2010) The potential of wetlands in reducing storm surge. Ocean Eng 37:59鈥?8View Article
  24.White BL, Nepf HM (2007) Shear instability and coherent structures in shallow flow adjacent to a porous layer. J Fluid Mech 593:1鈥?2View Article
  25.Yamagishi M, Togano T, Tashiro S (2007) Phase averaging analysis of the unsteady velocity profiles in the separation flow on the flat plate. J Environ Eng 2(4):667鈥?80View Article
  
• 作者单位：Melanie K. Truong (1)
  Kerri A. Whilden (1)
  Scott A. Socolofsky (1)
  Jennifer L. Irish (2)
  
  1. Coastal and Ocean Engineering Division, Zachry Department of Civil Engineering, Texas A&M University, 3136 TAMU, College Station, TX, 77843, USA
  2. Charles Edward Via, Jr. Department of Civil and Environmental Engineering, Virginia Tech, 221D Patton Hall, Blacksburg, VA, 24061, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environmental Physics
  Mechanics
  Hydrogeology
  Meteorology and Climatology
  Oceanography
  
• 出版者：Springer Netherlands
• ISSN：1573-1510

文摘

This paper presents laboratory experiments of wave-driven hydrodynamics in a three-dimensional laboratory model of constructed coastal wetlands. The simulated wetland plants were placed on the tops of conically-shaped mounds, such that the laboratory model was dynamically similar to marsh mounds constructed in Dalehite Cove in Galveston Bay, Texas. Three marsh mounds were placed in the three-dimensional wave basin of the Haynes Coastal Engineering Laboratory at Texas A&M University, with the center of the central wetland mound located in the center of the tank along a plane of symmetry in the alongshore direction. The experiments included two water depths, corresponding to emergent and submerged vegetation, and four wave conditions, typical of wind-driven waves and ocean swell. The wave conditions were designed so that the waves would break on the offshore slope of the wetland mounds, sending a strong swash current through the vegetated patches. Three different spacings between the wetland mounds were tested. To understand the effects of vegetation, all experiments were repeated with and without simulated plants. Measurements were made throughout the nearshore region surrounding the wetland mounds using a dense array of acoustic Doppler velocimeters and capacitance wave gauges. These data were analyzed to quantify the significant wave height, phase average wave field and phase lags, wave energy dissipation over the vegetated patches, mean surface water levels, and the near-bottom current field. The significant wave height and energy dissipation results demonstrated that the bathymetry is the dominant mechanism for wave attenuation for this design. The presence of plants primarily increases the rate of wave attenuation through the vegetation and causes a blockage effect on flow through the vegetation. The nearshore circulation is most evident in the water level and velocity data. In the narrowest mound spacing, flow is obstructed in the channel between mounds by the mound slope and forced over the wetlands. The close mound spacing also retains water in the nearshore, resulting in a large setup and lower flows through the channel. As the spacing increases, flow is less obstructed in the channel. This allows for more refraction of waves off the mounds and deflection of flow around the plant patches, yielding higher recirculating flow through the channel between mounds. An optimal balance of unobstructed flow in the channel, wave dissipation over the mounds, and modest setup in the nearshore results when the edge-to-edge plant spacing is equal to the mound base diameter.