發(fā)布時(shí)間：2018-03-11 12:49

  本文選題：沙質(zhì)海灘　切入點(diǎn)：海灘演化　出處：《應(yīng)用基礎(chǔ)與工程科學(xué)學(xué)報(bào)》2016年02期 　論文類型：期刊論文

【摘要】：基于二維波浪水槽實(shí)驗(yàn),采用沙質(zhì)斜坡概化海灘,分別選用規(guī)則波和橢圓余弦波進(jìn)行實(shí)驗(yàn),測(cè)量波浪作用前后的海灘剖面形態(tài)及斷面沉積物粒徑組成,探討波浪作用下沙質(zhì)海灘沉積物運(yùn)動(dòng)特征,包括剖面形態(tài)演化特征及其床沙分選規(guī)律.結(jié)果表明:沙質(zhì)海灘剖面形態(tài)時(shí)空演化特征受波浪類型、波高、周期等因素影響,呈現(xiàn)出沙壩形態(tài)和灘肩形態(tài),發(fā)現(xiàn)波浪Irribarren參數(shù)可以作為沙質(zhì)海灘剖面演化形態(tài)的判別參數(shù).在本實(shí)驗(yàn)條件下,Irribarren參數(shù)大,海灘剖面呈現(xiàn)灘肩形態(tài);Irribarren參數(shù)小,海灘剖面則呈現(xiàn)沙壩形態(tài).海灘床面沉積物在波浪作用下產(chǎn)生了明顯的分選現(xiàn)象,波浪破碎產(chǎn)生的強(qiáng)烈紊動(dòng)造成床面沉積物的起動(dòng)、并為小顆粒的運(yùn)動(dòng)提供動(dòng)力.水體紊動(dòng)導(dǎo)致水流挾沙力降低,大顆粒泥沙在紊動(dòng)較強(qiáng)區(qū)域產(chǎn)生沉積,部分被水流挾帶發(fā)生向岸推移;小顆粒泥沙則隨水流運(yùn)動(dòng),在紊動(dòng)較弱的區(qū)域分散沉積.
[Abstract]:Based on 2-D wave flume experiment, sand slope was used to generalize the beach. Regular wave and elliptical cosine wave were used to measure the beach profile and sediment size composition before and after wave action. The characteristics of sediment movement in sandy beach under wave action, including the characteristics of profile morphology evolution and bed sediment sorting, are discussed. The results show that the spatial and temporal evolution characteristics of sand beach profile are affected by wave type, wave height, period and so on. It is found that the wave Irribarren parameter can be used as a discriminant parameter for the evolution of sandy beach profile. Under the experimental conditions, the Irribarren parameter is large and the beach profile is small. The beach section shows the sand dam shape. The beach bed sediment has obvious sorting phenomenon under the action of the wave, and the strong turbulence caused by the wave breaking causes the bed surface sediment to start. It also provides power for the movement of small particles. Turbulence results in the decrease of sediment carrying capacity of water flow, the deposition of large sediment in the turbulent region, and the moving of small sediment along with the water flow, some of which are carried ashore by the flow of water. The deposits are dispersed in the less turbulent regions.
【作者單位】： 長(zhǎng)沙理工大學(xué)水利工程學(xué)院水沙科學(xué)與水災(zāi)害防治湖南省重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金重點(diǎn)項(xiàng)目(51239001);國家自然科學(xué)基金項(xiàng)目(51179015,51409022,50979008)
【分類號(hào)】：TV148

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本文編號(hào)：1598243