沙波迎流面泥沙起动流速研究

发布时间：2017-12-31 02:17

本文关键词：沙波迎流面泥沙起动流速研究　出处：《泥沙研究》2016年02期 　论文类型：期刊论文

【摘要】：利用概化沙波模型,研究了不同坡度、粒径及位置情况下的泥沙起动流速,根据实测数据指出沙波泥沙起动流速特征,并分析比较了与平坡起动的差别。通过对泥沙颗粒的受力分析,提出水流冲击力,并利用沙波垂线流速分布公式进行流速换算,建立了沙波泥沙起动流速计算公式。结果表明:在相同水流条件下,因沙波地形影响,迎流面泥沙起动流速值小于平坡;沙波不同位置处的泥沙起动流速非定值,随着水平位置而变化;坡度和粒径对再附点附近泥沙起动流速影响较小。通过验证比较表明,公式计算结果与实测资料基本一致,适用于描述沙波迎流面泥沙起动规律,可反映出沙波坡度和水平位置的影响。
[Abstract]:Based on the generalized sand wave model, the sediment incipient velocity under different slope, particle size and position is studied. The characteristics of sediment initial velocity are pointed out according to the measured data. Through the analysis of the force of sediment particles, the impact force of water flow is put forward, and the velocity conversion is carried out by using the formula of velocity distribution of sand wave vertical line. The formula for calculating the initial velocity of sand wave and sediment is established. The results show that under the same water flow condition, the value of sediment initial velocity on the front surface is smaller than that on the flat slope due to the influence of sand wave topography. The incipient velocity of sediment at different locations of sand wave varies with the horizontal position. The slope and particle size have little influence on the starting velocity of sediment near the reattachment point. The results of verification and comparison show that the calculated results are basically consistent with the measured data and can be used to describe the sediment incipient law on the sand wave front. It can reflect the influence of slope and horizontal position of sand wave.
【作者单位】：交通运输部天津水运工程科学研究院;河海大学港口海岸与近海工程学院;
【基金】：中央级公益性科研院所基本科研业务费专项(TKS130105,TKS150102)
【分类号】：TV142.1
【正文快照】： 沙波是天然河流中普遍存在的河床形态之一。为了简化问题,泥沙运动规律的研究多以平整床面上的泥沙作为对象,取得很大的进展,得到了丰富的实测和理论成果[1]。沙波泥沙起动是泥沙运动理论中的基本问题之一,也是研究工程泥沙会遇到的实际问题。由于沙波形态周期性变化,沙波泥沙

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