基于含沙紊动水流掺混长度的含沙量垂线分布  

Vertical distribution of suspended sediment concentration based on mixing length of sediment-laden turbulent flow

作　　者：丰青[1] 李瑞杰[1,2] 江森汇[1,2] 郑俊[1] 

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]河海大学环境海洋实验室,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2012年第5期549-554,共6页Journal of Hohai University(Natural Sciences)

基　　金：国家海洋公益性行业科研专项(201205005);教育部高等学校博士学科点科研专项基金(200802940014);河海大学自然科学基金(2008430511)

摘　　要：根据Prandtl掺混长度理论对紊流动量传递的假设,推广得到挟沙水流中泥沙扩散对应的含沙紊动水流掺混长度。类比Prandtl动量传递系数与紊流掺混长度的关系,由含沙紊动水流掺混长度推导出与实测数据吻合较好的泥沙扩散系数,得到新的含沙量垂线分布公式,并利用多个海域实测资料对其进行验证。验证结果表明,新的含沙量垂线分布公式能够较客观地反映含沙量垂线分布规律。Based on the Prandtl mixing length theory of turbulence momentum transfer, the mixing length of the sediment-laden turbulent flow, which matches the sediment diffusion of sediment-laden flows, was deduced. Compared with the relationship between the Prandtl momentum transfer coefficient and the turbulence mixing length, the sediment diffusion coefficient and a new formula of vertical distribution of sediment concentration were deduced from the mixing length of the sediment-laden turbulent flow, and were shown to be identical with observed data from various ocean areas. The results show that the deduced formula can accurately describe the vertical distribution of sediment concentration.

关 键 词：含沙紊动水流掺混长度 泥沙扩散系数 含沙量垂线分布 

分 类 号：TV143[水利工程—水力学及河流动力学]