粘性泥沙冲刷源项公式的改进  

Refining calculation of erosion source term of cohesive sediment

作　　者：雷文韬[1] 夏军强[2] 谈广鸣[2] 

机构地区：[1]长江科学院河流研究所,湖北武汉430010 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《泥沙研究》2013年第5期35-40,共6页Journal of Sediment Research

基　　金：国家自然科学基金资助项目(51079103);高等学校博士学科点专项科研基金资助项目(20120141110011);中央级公益性科研院所基本科研业务费项目(CKSF2013006/HL)

摘　　要：为研究粘性泥沙的冲刷规律,本文引入床沙相对干密度以反映冲刷源项与床沙干密度的关系,提出分别适用于弱固结和强固结河床的冲刷源项公式。采用室内粘性泥沙的冲刷试验资料确定公式中各系数,然后采用天然沙及细颗粒石英沙的冲刷试验资料验证强固结河床的冲刷源项公式。计算得到的冲刷源项与实测值符合较好,结果表明这两个公式能够用来计算水沙数学模型中粘性泥沙的输移过程。Two refined formulae of the erosion source term （EST） for the weakly and strongly consolidated bed materials are presented respectively, which adopt the relative dry bulk density to represent the relationship be tween the EST and dry bulk density. The coefficients in the two formulae are calibrated by the observed data from laboratory experiments documented in the literature. The refined formula for the strongly consolidated bed material is then validated against the available experimental data based on the samples of natural bed materials and fine quartz particles. The calculated ESTs generally agree with the observed data, which indicates that the refined formulae can be applied to modelling the transport of cohesive sediment.

关 键 词：粘性泥沙 冲刷源项 相对干密度 弱固结 强固结 

分 类 号：TV149.1[水利工程—水力学及河流动力学]