Research On All-weather Stratified Water Quality Monitoring Technology And Device

It is the basis of ensuring the safety of reservoir source water supply to obtain the real-time hierarchical information of water quality and master the water quality status.The traditional sampling laboratory test method to obtain water quality information costs a lot of manpower and financial resources,and the timeliness is poor.The existing national fixed-point monitoring stations and buoy monitoring stations have poor adaptability to extreme conditions,and are not suitable for obtaining all-weather water quality stratification information with long operation time,large variation of water depth and complex monitoring conditions,which also makes it difficult to obtain complete time series water quality stratification monitoring data in northern China.In order to realize all-weather water quality layered monitoring under complex working conditions,this paper studies all-weather water quality layered monitoring technology and device.The main achievements are as follows(1)Stratified sampling and on-site detection technology are used to investigate the stratified characteristics of water quality in Biliuhe reservoir.The sampling ship drifts seriously during the sampling process,so it is difficult to realize vertical stratified sampling.The results of water quality stratification test show that the characteristics of reservoir water quality stratification are greatly affected by the location of sampling points and sampling time,and the representativeness of single sampling is low,which requires all-weather monitoring of water quality stratification information.(2)On the basis of in-depth understanding of the working principle of water quality online monitoring,the key technologies of all-weather water quality layered monitoring,including sensor layered technology,power supply and stable operation guarantee technology,are studied,and an all-weather water quality monitoring system including software monitoring platform,hardware transmission equipment,sensor unit and power supply unit is developed.(3)Aiming at the layered monitoring condition of reservoir water quality with stable water depth,a ship type all-weather layered monitoring device for water quality is developed.The layered technology of single-mode ship and low disturbance and low power consumption positive suspension sensor is adopted to solve the problem of unstable water quality monitoring frequency caused by disturbed water quality and unstable energy supply in winter in the traditional buoy winch type layered monitoring.(4)Aiming at the layered monitoring condition of reservoir water quality with great environmental change,an all-weather water quality layered monitoring device was developed.The layered technology of shore structure and inverted sensor was adopted to solve the problems of sensor failure caused by water depth change and ice generation and dissipation process,The sensor washing cleaning technology is used to solve the problem of microbial adhesion in long-term monitoring,and the anchoring technology is used to reduce the difficulty of construction and maintenance.(5)The long-term operation performance and data of the above devices are analyzed in reservoirs in northern China.The results show that the above devices can achieve long-term and stable all-weather water quality layered monitoring under complex working conditions...