基于水流功率理论的动床阻力计算方法  

Study on the resistance of movable bed based on stream power

作　　者：黄才安[1] 赵晓冬[2] 龚敏飞[1] 

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009 [2]南京水利科学研究院,江苏南京210024

出　　处：《扬州大学学报（自然科学版）》2004年第4期71-74,共4页Journal of Yangzhou University：Natural Science Edition

基　　金：江苏省高校省级重点实验室开放课题(KJS01060)

摘　　要：冲积河流阻力是泥沙运动力学中的一个重要问题.利用1 844组实测资料,基于水流功率的概念建立了总水流功率与有效水流功率的经验关系.在泥沙起动前后总水流功率与有效水流功率基本一致;在低能态区,由于有沙垄、沙纹出现,总水流功率明显大于有效水流功率;在高能态区,从动平整床面到沙浪的出现,总水流功率又逐渐背离有效水流功率.用近10 000组水槽和天然河道资料验证表明,该经验关系式精度较高.Alluvial channel resistance is one of the most important issues in sediment transport mechanics. By using of 1 844 sets of measured data, a empirical relationship between the total stream power and the effective stream power is proposed based on the concept of stream power. At the beginning of sediment motion, the total stream power is almost the same as the effective stream power. At lower flow regime, because of the occurrence of sand ripple and sand dune the total stream power is obviously larger than the effective stream power. At upper flow regime, the total stream power gradually deviate the effective stream power from movable plane bed to existence of sand wave. The verification using nearly 10 000 sets of flume and natural river data shows that the precision of this new proposed relationship is high.

关 键 词：冲积河流 水流阻力 水流功率 有效水流功率 

分 类 号：TV142[水利工程—水力学及河流动力学]