Experimental investigation of the effect of salt wedge on concentration of suspended non-cohesive particles in turbid flow

2019 2nd International Conference of Green Buildings and Environmental Management

生态环境科学

Yin, Xiaoling^1^2 ; Yang, Bangjian^1 ; Ying, Zeng^1 ; Huang, Shuqin^1 ; Yu, Lanxin^1 ; Lu, Chen^2

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong

510640, China^1

Key Laboratory of the Pearl River Estuarine Dynamics and Associated Process Regulation, Guangzhou, Guangdong

510641, China^2

关键词: Acoustic doppler;    Cohesive particle;    Experimental investigations;    Interfacial instability;    Large scale turbulence;    Sediment carrying capacity;    Suspended sediment concentrations;    Velocity profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/310/4/042045/pdf
DOI  :  10.1088/1755-1315/310/4/042045

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

To have an insight of the effects of salt wedge on suspended sediment concentration (SSC), we carried out experiments of intruding salt wedge in flume with fresh turbid water of non-cohesive particles and salt water free of sediment. Two sets of Acoustic Doppler Velocity Profiler (ADVP) were used to record instantaneous velocity profiles in the saline affected zone near the bed. The acoustic back scattered signal amplitudes (AMP) in the measurements were used to estimate SSC at the same point and the same time. The results show that around the interface shear of exchange flow is remarkable and SSC increases noticeably. Flow analysis indicates that large scale turbulence from interfacial instability is the main power source to enhance sediment carrying capacity of the flow. It weakens and retards the particles in the upper turbid layer sinking to the lower saline zone. However, the energy dissipation doesn't show much change.