Presenter
Ms. Chenxi LI, Nanjing Research Institute of Hydrology and Water Conservation Automation, Ministry of Water Resources
Co-author(s)
Mr. Jun Zong, Nanjing Research Institute of Hydrology and Water Conservation Automation, Ministry of Water Resources
Mr. Zhan Ma, Nanjing Research Institute of Hydrology and Water Conservation Automation, Ministry of Water Resources
Sub-theme
3. Building Resilience for Disaster Prevention and Mitigation
Topic
3-5. Monitoring and early warning of water-related disasters
Body
The stream flow discharge is one of the essential parameters traditionally monitored as a general indicator of the river and open channel hydraulic dynamics. The real-time online monitoring of natural streams and open channels with the data acquisition of discharge plays a critical performance in constructing a digital twin water basin system guided by “SIYU” (Forecasting, Early-warning, Drill, and Emergency plan, FEDE). This paper aims at an initiation of developing a new hydraulic model for the measurement of river discharge. The new method attempts to resolve the long-standing dilemma of irregular correlation of local velocities to mean velocity in a stream flow cross-section. The new method is directly addressing the basic theory of open channel discharge hydrometry with the principle of calculus calculation. The river and open channel cross-section velocity vertical line method is a simplified performance from the hydrological vertical velocity flow measurement method which is a flow measurement method simplified from the principle of an integral sum. The vertically averaged velocity method is developed from the hydraulic experiments for the even velocity distribution. The author extended the vertical average method to the uneven velocity distribution discharge calculation by the two-line vertical average velocities along the middle stream. The author substituted the two vertical line velocities into the vertical velocity model to obtain energy slope parameters for stream discharge calculation. This is the Two Vertical Lines Energy Slope Method. A real-time online stream discharge measurement system is built upon the Two Vertical Lines Energy Slope Method with automatic velocity sensor and IoT technology for accurate discharge telemetry. The new method attained an extreme accuracy of flow discharge measurement with Grade A evaluation in all cases according to Code for Liquid Flow Measurement in Open Channels (GB50179-2015) with no need for parameters calibration and flow-velocity correlation establishment. This method puts a rigorous, scientific, and well-deserved online stream discharge measurement. Thus, it appears to be a new method of river flow measurement that reaches out to the core disciplines of digital twin water basin construction and is well perceived by the guidance of “SIYU” (Forecasting, Early-warning, Drill, and Emergency plan, FEDE) driven by the Ministry of Water Resources.