清水作用下全动床复式河槽泥沙输移特性及其模拟  

Sediment Transport Nature and Its Simulation in Fully Mobile Bed Compound Channels Under the Action of Clear Water

作　　者：杨克君[1] 聂锐华[1] 曹叔尤[1] 刘兴年[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《四川大学学报（工程科学版）》2013年第2期6-12,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51279117;50709021);全国博士学位论文作者专项资金资助项目(201051)

摘　　要：推移质运动是河流动力学的基本问题之一,通过水槽试验探讨了清水作用下全动床复式河槽泥沙的输移特性,并通过理论分析提出了该类河道的推移质输沙率的计算方法。试验表明:在清水作用下全动床复式河槽推移质输沙率先随时间单调递增,而后随时间单调递减;推移质中值粒径先随时间大幅度增大,后随着时间的增加中值粒径增大的幅度减小,最终将趋于初始床沙中值粒径。根据推移质输沙率的变化特性,运用仙农熵的概念与理论,通过最大熵原理和变分法推导了河道粗化过程中的推移质输沙率公式,并对该公式参数的敏感性进行了分析。计算结果表明,该公式可以模拟全动床复式河槽河道粗化过程中的输沙率随时间的变化特性。Sediment transport is one of the basic issues in the field of river dynamics.The sediment transport nature in fully mobile bed compound channels was experimentally studied under the action of clear water and then the method for modeling the sediment transport rate in the type of channels was proposed.The experimental results showed that the sediment transport rate first increases and then decreases with time.The median diameter of sediment first rapidly and then slowly increases with time,and finally approach the median diameter of the original bed material.According to the motion nature of sediment transport,the computational method for sediment transport rate in the type of channel was proposed.Meanwhile,the sensitivity analysis of parameters in the proposed method was undertaken.The computed results showed that the method can be capable of modeling the sediment transport in the processes of clear-water action.

关 键 词：全动床 复式河槽 清水冲刷 推移质运动特性 输沙率计算方法 

分 类 号：TV133.1[水利工程—水力学及河流动力学]