T/ZDL 012-2023 Active

Main Technical Content: 6. Technical Methods 6.1 Equipment Installation 6.1.1 Based on the terrain and current direction of the measurement area, determine the type of current velocity acquisition equipment. One set of Doppler current profilers or similar equipment can be deployed upstream and downstream of the impeller installation location. 6.1.2 The installation distance of the current velocity detection equipment should be determined based on the design diameter (d) of the turbine impeller. The deployment point should be within a range of 2d to 5d from the impeller position. 6.1.3 The current velocity detection equipment should be firmly installed at the designated location. 6.1.4 The minimum water immersion depth of the Doppler current profiler should ensure that the transducer and acoustic channel operate within the water body without overflowing. **Figure 1: Arrangement Schematic of Current Velocity Detection Equipment** 6.2 Data Acquisition 6.2.1 Continuous and Stable Current Data Acquisition The current velocity detection equipment should sample the velocity signal at least once every 60 seconds and automatically record and calculate the arithmetic average velocity in meters per second every 10 minutes. 6.2.2 Directional Data Acquisition The current velocity detection equipment should sample the directional signal once every 5 minutes and automatically record the results in degrees. 6.2.3 Standard Deviation of Velocity The current velocity detection equipment should calculate the standard deviation of the minute-sampled velocity data and the 10-minute arithmetic average velocity in meters per second at 10-minute intervals. 6.2.4 Water Temperature The current velocity detection equipment should sample the water temperature once every 10 minutes and automatically record the results in °C. 6.2.5 Atmospheric Data Climate data such as atmospheric temperature, humidity, and pressure should be recorded in the monitoring ar