梯形断面明渠纵向离散系数的分析  

Determination of Longitudinal Dispersion Coefficient of Trapezoidal Open Channel

作　　者：曹倩[1] 邵东国[1] 张华[2] 李波[1] 刘玉龙[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]湖北省漳河工程管理局团林灌溉试验站,湖北荆门448156

出　　处：《南水北调与水利科技》2012年第6期14-17,共4页South-to-North Water Transfers and Water Science & Technology

基　　金：国家科技重大专项项目(2012ZX07205-005)

摘　　要：突发性污染事件发生后需要快速预测梯形断面明渠水质,此时要获得渠道的纵向离散系数。利用试验数据对构建公式的各参数进行相关性分析,根据河流经验公式形式提出了梯形断面明渠纵向离散系数经验公式形式,经过线性相关性分析、回归计算,推求出各参数的系数,得到梯形断面明渠纵向离散系数经验公式。最后,探讨了利用流速分布研究结果修正样本数据,发现最大流速经验公式的选取会影响参数的相关性。将计算结果与实测结果比较,吻合良好,表明该经验公式合理可靠,可以应用于梯形断面明渠纵向离散系数的估算。Once a water pollution accident breaks out in trapezoidal open channels, the pollutant concentration distributions caused by it must be quickly determined and then effective measures can be taken. The longitudinal dispersion coefficient should be studied first since it is a primary factor for water quality model. The data of this article was from outdoor tracer experiment and laboratory study results. Parameters were selected through correlation analysis and then an empirical formula of longitudi- nal dispersion coefficient was deduced by regression analysis. Besides, the way to modify the sample data with the research re- sult of velocity distribution was also discussed in this paper. The empirical formula of this paper was proved to be reasonable and reliable by calculation and comparison. It can be used to estimate the dispersion coefficient of trapezoidal open channels.

关 键 词：梯形断面 明渠 流速分布 纵向离散系数 示踪试验 回归计算 相关性 

分 类 号：TV133[水利工程—水力学及河流动力学]