Research On The Ultrasonic Flow Meter's Application Of Real-time Monitoring Automatic Flow Gauging In Reservoir Irrigation Areas

Accurate and reliable monitor on open channel flow in our country hasn't been resolved satisfactorily. At present, we are still using the traditional way: ad hoc volume of water equipment, water gauge, velocity meter etc. Using the velocity meter to measure the flow of the water-carrying section, need to measure many monitoring points in the same water-carrying section with a time, and then use the average value of the water–carrying section as flow velocity. This will enable the efficiency. In case the changes of the water level in the measurement process, the flow velocity will poor consistency and have greater impact on the discharge precision. The average flow velocity can not get from the average flow velocity of every monitoring point in the same time, but by a period of time. And in the production practice, generally, for various reasons we only detected one time in a day, let's it representative of the flow velocity of the whole day, thus accuracy of flow gauging was reduced.This study choose Changle Gaoya reservoir irrigation areas as the study sites, through the installation of different ultrasonic equipment on open channel of non-uniform flow to study the flow gauging of non-uniform flow in open channel:(1)5 tracks ultrasonic open channel flow meter used to real-time monitoring the flow of velocity ,water depth and discharge;(2)Ultrasonic liquid level gauge used to real-time measure the upper level and tail level of the two sections ,then the computer calculated average water level, gradient of water table and discharge;(3)Change the open channel water conveyance into pipeline full flow water conveyance, installed the ultrasonic liquid level gauge and pipe flow gauge on the inflow point and surface of pipe, water level and discharge would detect in real time.Irrigation areas water gagging is the important part of the agricultural water saving. Inaccuracy meterage irrigation water can cause water saving difficult to carry out; irrigation areas water gagging is also the basis work of realizing accuracy irrigation. So irrigation areas water gagging is the key of optimizing water utilization dispatching, realizing water utilization control.The development of irrigation water management must towards informatization and highly efficient in our irrigation areas, automation and real-time monitoring of water gagging is the basis for automatic reconstruction in...