Structure of a Horizontal Sediment-Laden Momentum Jet
Structure of a Horizontal Sediment-Laden Momentum Jet
复制标题
水平沉积物动量射流的结构
DOI：
10.1061/(asce)hy.1943-7900.0000662
复制
发表时间：
2013
影响因子：
2.4
通讯作者：
Joseph H. W. Lee
中科院分区：
文献类型：
--
作者：
W. Y. Lee;Anna C. Y. Li;Joseph H. W. Lee
从海洋排放口扩散器排放的部分处理的废水通常含有无机和有机固体，这些固体可能在靠近源头的地方沉降，并产生影响底栖生态的污泥库。本文对静止环境中水平泥沙动量射流的结构和沉降机理进行了实验和理论研究。首次测量了水平射流断面的颗粒浓度分布。对41个装有沙粒或合成球形玻璃颗粒的动量射流实验进行了底部沉积测量。沉积物射流的特征在于由射流动量通量和颗粒沉降速度定义的沉积长度尺度lm。实测的纵向泥沙淤积率可以用基于lm的半经验对数正态分布来描述。在瞬时颗粒分布中，沉降物集中在一个中心区域，沉降物的粒径分布与沉降物的粒径分布基本一致。
AbstractPartially treated wastewater discharge from marine outfall diffusers often contains inorganic and organic solids that may settle close to the source and give rise to sludge banks that affect benthic ecology. An experimental and theoretical investigation of the structure and settling mechanisms of a horizontal sediment momentum jet in stagnant ambient has been carried out. The cross-sectional particle concentration distribution of a horizontal sediment jet is measured for the first time. Bottom deposition measurements are made for a total of 41 experiments of momentum jets laden with sand particles or synthetic spherical glass particles. The sediment jet can be characterised by a sedimentation length scale lm defined by the jet momentum flux and particle settling velocity. The measured longitudinal sediment deposition rate can be described by a semiempirical log-normal distribution based on lm. In the instantaneous particle distribution, the sediment fallout is concentrated in a central region and ...