Study On The Movement Characteristics Of Algae Debris Particles

The field investigation found that,algae in the main canal of the Middle Route of the South-to-North Water Transfer Project have withered and died due to climatic conditions and life cycle,and follow the flow,it is easy to deposit at the positions of sudden expansion sections such as the sluice and the water diversion opening,which affects the water quality in the main channel and the normal water delivery.Desilting needs to be done frequently.In order to better investigate the drift of algae debris particles in the main channel with water,the determination of the sedimentation rate of algae debris,it is the basis for studying its transport and settlement distribution.This article selects six model materials with different materials and particle sizes.Application of PTV particle tracking velocimetry to determine the hydrostatic sedimentation rate of algae debris particles.Passing the hydrostatic sedimentation test of algae debris particles in one set of working conditions and the hydrostatic sedimentation test of different model materials and different particle sizes in 24 working conditions,study the sedimentation and specific gravity characteristics of algae debris,explore the settlement characteristics of different model materials,and choose the model material suitable for field drifting and tracing test.The results show,the aquatic sedimentation speed of algal debris is 0.008 m / s,the specific gravity in water is 1.004;Model materials of the same specific gravity,the larger the particle size,the greater the hydrostatic sinking speed.Model materials of similar or the same particle size,the greater the specific gravity,the greater the hydrostatic sinking speed.Model material with smaller specific gravity,the slope of the static water sedimentation speed with the increase of particle size is small;Chia seeds have an average particle size of 3.5 mm,the average specific gravity is 1.05,the average specific gravity is 1.05,its physical and hydrodynamic properties are similar to those of algae debris.It can be used as a field drifting tracer test material for algae debris particles such as the main channel of the South-to-North Water Transfer Project.In order to better study the drift and sedimentation of algae debris particles under dynamic water conditions,this paper chooses PA66 resin as the model material.This paper chooses PA66 resin as the model material.Determine its static water sinking speed.Through the above research methods,the results show that,when PA66 resin has a salt concentration of 15.6mol / L,the average particle size is 3.2mm,the average specific gravity is 1.01,the average static water sinking speed is 0.019 m / s,can replace algae debris particles,as a model material for drifting and tracing under moving water conditions.Based on the above studies,the following conclusions can be drawn:(1)Use model particles with uniform particle size and stable physical and chemical properties,replacement particle size is not fixed,physical and chemical properties of unstable algae debris particles,applying PTV technology,the hydrostatic sedimentation rate and specific gravity of model particles and algae debris particles were measured,after comparative analysis,it was found that the chill seeds and PA66 resin and the algae debris particles had the closest static sedimentation rate and specific gravity.Can replace algae debris particles,it is used as a tracer for drifting and settlement of the South-to-North Water Transfer Project.(2)With the selected model particles,study the drifting and sedimentation movement of algae debris in water,the results can provide technical support for algae prevention and efficient dredging in the main canal of the South-to-North Water Transfer Project.