Water measurement method and device

Abstract

The invention discloses a water measurement method and device. The water measurement method and device change a fixing mode of a traditional thin-plate weir, the two ends of a weir plate are providedwith hoisting mechanisms, and the hoisting mechanisms are driven by a lifting mechanism, thereby achieving that the height of the thin-plate weir is adjustable by adjusting the height of the weir plate. When the weir plate is moved downward to a flow control state and a water measurement state, water flows through the top of the weir plate, the flow rate is regulated by controlling the downward movement amount of the weir plate, the largest water head, of 2-5 times of a weir crest, on the upstream of the weir plate 1 is provided with a water level observation point to measure the weir passingwater head; at the moment, a whole weir gate forms the thin-plate weir, and at a certain predetermined height of the weir plate, the flow rate through the weir gate is calculated by measuring the water head on the weir and the structural size of the weir gate. The applicable limitations and disadvantages of the conventional thin-plate weir can be overcome, and the rectangular thin-plate weir whichis a laboratory precision level of water measurement equipment can be applied to the field and canal system.

Description

technical field [0001] The invention relates to the field of hydraulic structures, in particular to a method and device for measuring water. Background technique [0002] The thin-walled weir is a classic open channel water measuring device with mature technology and solid theoretical foundation, and it is a relatively accurate water measuring device. In the current water conservancy industry standard "Hydraulic Structures and Weir and Flume Test Specifications" (SL 537), the national standard "Water Measurement Specifications for Irrigation Canal Systems" (GB / T 21303), "Guidelines for Water Intake Measurement" (GB / T 28714 ), the national measurement and testing standard "Guidelines for the Verification of Open Channel Weir and Flume Flowmeters" (JJG (Water Conservancy) 004) and the international standard "Open Channel Flow Test - Thin Wall Weir" (ISO1438) all include thin wall weirs. The test method and applicable conditions are stipulated, and the measurement accuracy can...

AI Technical Summary

Problems solved by technology

Since the existing conventional thin-walled weir has a fixed weir height, it cannot overcome the disadvantages of being submerged when the water is high and blocking water when the water is small due to the limitation of the use conditions of the flow formula, and when the water body has a large sediment content, it is easy to cause siltation in trenches in front of weirs

Due to the above drawbacks, this method is usually only applied to laboratory testing

[0008] In addition, due to the "Code for Water Measurement of Irrigation Canal System" (GB / T 21303-2017) and other norms and standards, the use of the numerical range of the longitudinal shrinkage ratio (H / P) of thin-walled weirs is limited.

Moreover, the conventional thin-walled weir has a fixed weir height. Under a certain flow rate, the longitudinal shrinkage ratio (H / P) formed by it is fixed. If it exceeds the range, the accuracy will be greatly reduced, so the use is greatly restricted.

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