Laboratory experiments and numerical modeling of wave attenuation through artificial vegetation

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dc.contributor.advisor Irish , Jennifer en_US
dc.contributor.committeeMember Edge , Billy en_US
dc.creator Augustin , Lauren Nicole en_US
dc.date.accessioned 2010 -01 -15T00 :11 :57Z
dc.date.accessioned 2014 -02 -19T19 :31 :55Z
dc.date.available 2010 -01 -15T00 :11 :57Z
dc.date.available 2014 -02 -19T19 :31 :55Z
dc.date.created 2007 -12 en_US
dc.date.issued 2009 -05 -15 en_US
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2563
dc.description.abstract It is commonly known that coastal vegetation dissipates energy and aids in shoreline protection by damping incoming waves and depositing sediment in vegetated regions . However , this critical role of vegetation to dampen wave forces is not fully understood at present . A series of laboratory experiments were conducted in the Haynes Coastal Laboratory and 2 -D flume at Texas A &M University to examine different vegetative scenarios and analyze the wave damping effects of incident wave height , stem density , wave period , plant type , and water depth with respect to stem length . In wetland regions vegetation is one of the main factors influencing hydraulic roughness . Traditional open -channel flow equations , including the Manning and Darcy - Weisbach friction factor approach , have been successfully applied to determine bottom friction coefficients for flows in the presence of vegetation . There have been numerous relationships derived relating the friction factor to different flow regime boundary layers to try and derive a wave friction factor for estimating energy dissipation due to bottom bed roughness . The boundary layer problem is fairly complex , and studies relating the wave friction factor to vegetation roughness elements are sparse . In this thesis the friction factor is being applied to estimate the energy dissipation under waves due to artificial vegetation . The friction factor is tuned to the laboratory experiments through the use of the numerical model COULWAVE so that the pipe flow formulation can be reasonably applied to wave problems . A numerical friction factor is found for each case through an iterative process and empirical relationships are derived relating the friction factor for submerged and emergent plant conditions to the Ursell number . These relationships can be used to reasonably estimate a wave friction factor for practical engineering purposes . This thesis quantitatively analyzes wave damping due to the effects of wave period , incident wave height , horizontal stem density , water depth relative to stem length , and plant type for a 6 m plant bed length . A friction factor is then determined numerically for each of the laboratory experiments , and a set of equations is derived for predicting a roughness coefficient for vegetation densities ranging between 97 stems /m2 and 162 stems /m2 . en_US
dc.format.medium electronic en_US
dc.format.mimetype application /pdf en_US
dc.language.iso en _US en_US
dc.subject attenuation en_US
dc.title Laboratory experiments and numerical modeling of wave attenuation through artificial vegetation en_US
dc.type Book en
dc.type.genre Electronic Thesis en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US

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Laboratory experiments and numerical modeling of wave attenuation through artificial vegetation. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2563 .

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