| As an important natural resource,water,together with the land,the sun and the atmosphere,constitutes the basic living conditions for all organisms.China is an agricultural country,which accounted for the demand for water resources in a large proportion,unreasonable distribution of water resources in different regions and the increasingly prominent contradiction between supply and demand,the amount of water used for agriculture has reached above 70% of the total water,which is in the leading position of agricultural irrigation water,irrigation water is mostly water channel.In recent years,with the development of economy,irrigation water distribution engineering and irrigation engineering standardization construction,realize the effective water-saving irrigation district,the reasonable allocation of water resources to ensure effective use of irrigation,it will greatly improve the utilization rate of agricultural water,make water better we use.With the rapid development of information construction,the irrigation area is developing in the direction of accurate measurement,real-time monitoring and scientific and effective management.Based on a series of problems in current irrigation area in China,it is an important measure to design a set of flow measurement system suitable for irrigation area information construction,which is an important significance to the construction of water resources monitoring capacity in China.Based on the status,application and development trend of open channelwater in irrigation area,this research has developed a set of portable automatic monitoring system for open channel flow based on Internet of things platform,using a pitot tube and pressure detection channel flow signal sensor,the detection signal is multiplexed through a multi-channel digital controlled analog switch into STC8051 microcontroller processing,realize the measurements in the display or through the Internet to the cloud platform for processing on the LCD screen,so as to realize the real-time monitoring of the flow for open channel flow measurement presents a new flow measurement method.The main contents of this subject are as follows:(1)based on the pitot principle,Bernoulli principle and hydraulic static pressure theory knowledge,the overall design of the system of automatic monitoring technology and open channel flow with portable computer technology,sensor network communication technology based on the existing Internet cloud platform.(2)the design of hardware circuit of the system,including data acquisition,data transmission and display part.(3)according to the requirements of flow measurement,flow measurement of mechanical design and fabrication.(4)writing and debugging using Python language and C language combined with C++ to complete the system software program.(5)according to the characteristics of the client,the server terminal,the system cloud platform.(6)the system needs a large number of experiments in the current experiment hall standard channel system,obtain the flow velocity and flow of real-time data,establish the velocity distribution curve model,verify the reliability and practicality of the system.On the basis of the existing water conservancy theory and improve the accuracy of the flow measuring device,through a large number of experiments,verify the flow measurement precision of the system,realize the wireless transmission of data in the process of flow measurement and real-time monitoring,reduce the cost of flow measurement,this system operation is simple and easy to carry,this to our country irrigation channel measurement flow has important popularization value and application prospect. |
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