In order to improve the accuracy of flow measurement with buoy method,aiming at the problems of difficult recovery,low accuracy and low degree of automation of traditional GPS buoy method,a combination of UAV flying technology and buoy method is proposed.First of all,the waterproof UAV is designed as a buoy carrier,which can fly to any point on the water surface by using its flexibility(taking off and landing on water)and high-precision positioning(RTK differential positioning).The UAV carrier is the buoy carrier,which is sent to the ground station of the UAV in real time with the water drifting speed(that is,the moving speed of the UAV,that is,the water surface water speed).Secondly,the depth sounder and visible light are carried at the bottom of the carrier to transmit the water level and scene picture to the ground station in real time through the digital map transmission system of the UAV,and the ground station can check the floating trajectory route of the carrier.After the test,the flying buoy carrier flies back to the starting point.This method is convenient for recovery,and has the advantages of low cost,recycling and convenience.In flood period,flow automation,high efficiency and real-time measurement can be realized with the help of large cross-section data.
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