长江中游城汉河段推移质输沙率计算公式

发布时间：2018-06-16 12:04

本文选题：推移质输沙率 + 城汉河段　；参考：《水科学进展》2017年03期

【摘要】：三峡水库蓄水运用后,城汉河段悬移质输沙量大幅度减少,推移质输沙量所占比重增加,造床作用日益凸显,故开展其推移质输沙率计算公式研究具有理论与实际意义。利用螺山和汉口水文站实测资料建立了推移质输沙率与流量之间的指数关系式,并据此推算了两站逐日推移质输沙率,结果表明:螺山站、汉口站输沙率均与流量的0.912 78次方成正比,多年(2009—2015年)平均推移质输沙量分别为137万t、152万t,主要集中在汛期。利用推移质实测资料对Engelund、Einstein、Yalin 3个公式进行了检验与修正,结果表明:修正前各公式计算结果比较分散,且与实测值偏差很大;修正后各公式计算精度显著提高,综合比较发现,修正后的Yalin公式精度最高,Engelund公式、指数关系式次之,Einstein公式精度相对较低。因此,修正后的Yalin公式更适合于城汉河段推移质输沙率计算,可用于该河段的演变分析与数学模型计算。
[Abstract]:After the water storage and operation of the three Gorges Reservoir, the suspended sediment transport in the reach of Chenghan River is greatly reduced, the proportion of bed load sediment is increased, and the role of bed making is increasingly prominent. Therefore, it is of theoretical and practical significance to study the calculation formula of bed load transport rate. Based on the measured data of Luoshan and Hankou hydrological stations, the exponential relationship between bed load transport rate and discharge is established, and the daily bed load transport rate is calculated. The results show that: Luoshan station, The sediment transport rate of Hankou station is directly proportional to the 0.912 78th power of discharge, and the average bed load transport rate is 1.37 million t and 1.52 million t respectively, mainly in flood season. By using the measured data of bed load, the three formulas of Engelunda Einsteinnyalin are tested and corrected. The results show that the calculation results of the formulas before the modification are scattered and deviate from the measured values, and the accuracy of the formulas is obviously improved after the correction, and the comprehensive comparison shows that, The precision of modified Yalin formula is the highest than that of Engelund formula, and that of Einstein formula is relatively low. Therefore, the modified Yalin formula is more suitable for the calculation of bed load transport rate, and can be applied to the evolution analysis and mathematical model calculation of the reach.
【作者单位】：长江科学院水利部江湖治理与防洪重点实验室;长江中游水文水资源勘测局;
【基金】：国家自然科学基金资助项目(51339001;51379018)~~
【分类号】：TV142.2

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