本文選題：沙紋 + 波浪��； 參考：《水運(yùn)工程》2017年05期

【摘要】：波浪作用形成的沙紋在近海區(qū)域普遍存在,準(zhǔn)確預(yù)測沙紋床面形態(tài)并計(jì)算對應(yīng)的底摩阻系數(shù)是研究近岸波浪變形、泥沙輸運(yùn)及岸灘演變的基礎(chǔ)。利用國外公開發(fā)表的室內(nèi)試驗(yàn)和現(xiàn)場觀測數(shù)據(jù)對已有計(jì)算沙紋形態(tài)的典型公式進(jìn)行分析評價(jià)�？紤]床面形態(tài)與水流條件的互相適應(yīng),提出新的平衡狀態(tài)下沙紋長度、高度及波陡計(jì)算公式;引入臨界Shields參數(shù)判別函數(shù)來考慮底床泥沙運(yùn)動(dòng)狀態(tài)對沙紋形態(tài)的影響;通過理論推導(dǎo)得到波浪摩阻系數(shù)計(jì)算公式,并利用沙紋形態(tài)計(jì)算公式改進(jìn)粗糙高度的計(jì)算方法。結(jié)果表明,提出的沙紋形態(tài)計(jì)算公式能夠較好地刻畫不同底沙運(yùn)動(dòng)狀態(tài)下沙紋床面幾何特征,臨界Shields參數(shù)對于沙紋形態(tài)的計(jì)算具有重要影響;新得到的沙紋長度和高度公式可以有效地應(yīng)用于波浪摩阻系數(shù)計(jì)算。
[Abstract]:The sand stripes formed by wave action are common in the offshore area. It is the basis of studying the wave deformation, sediment transport and shoreline evolution to accurately predict the sand grain bed shape and calculate the corresponding bottom friction coefficient.The typical formulas for calculating sand grain morphology have been analyzed and evaluated by using the laboratory test and field observation data published abroad.Considering the mutual adaptation of bed shape and flow condition, a new formula for calculating the length, height and wave steepness of sand grain under equilibrium state is proposed, and the critical Shields parameter discriminant function is introduced to consider the influence of sediment movement state on sand grain shape.The calculation formula of wave friction coefficient is obtained by theoretical derivation, and the calculation method of rough height is improved by using the calculation formula of sand grain shape.The results show that the proposed formula can well describe the geometric characteristics of sand grain bed surface under different bottom sand movement, and the critical Shields parameters have important influence on the calculation of sand grain shape.The new formula of sand grain length and height can be effectively applied to the calculation of wave friction coefficient.
【作者單位】： 河海大學(xué)海岸災(zāi)害及防護(hù)教育部重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)港口海岸與近海工程學(xué)院;
【基金】：江蘇省普通高校研究生科研創(chuàng)新計(jì)劃項(xiàng)目(KYZZ15_0143)
【分類號】：P737.1;TV148

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本文編號：1741141