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What is the flow calculation for arch dam flooding?
(1) Intersection method of wave flow and weir flow;
(2) Saint Venants formula: Om 8 BH2=27 Vg (3) Shockleys formula: Om=0.9 [H/(H-0.827)] BH3/2
(4) American Watercourse Test Station formula: gm 27V8 (B/b) 02b1 ÷ 28=For local material dams, gradually breaking sails. Laugh: Yellow Silver Containing Committees formula: Om=0.29
6. There are many calculation formulas for g B 4. bmH5bmbm=KoABAH2, and the corresponding calculation method should be determined according to the calculation conditions.
.2. How many methods are there for measuring river flow?
The method for measuring river flow is as follows:
1. Flow meter method uses a flow meter to directly measure the flow of a river.
. There are many types of flow meters, mainly including differential pressure, electromagnetic, flow channel, and weir flow meters. It can be selected for use based on the actual flow range and testing accuracy requirements.2、 The volumetric method involves connecting river water into a container of known capacity, measuring the time required to fill the container, repeating the measurement multiple times, and calculating the average value t (s) to determine the water volume. This method is simple and easy to implement, with high measurement accuracy, and is suitable for rivers with small flow rates. However, there should be an appropriate drop between the overflow outlet and the receiving water body, or an error can be caused by the use of a conduit.
3、 The float method selects a straight river section, measures the cross-sectional area of the water flow within a 2-meter distance of the river section, and calculate
4、 The current meter method measures the cross-sectional area of water flow and calculates the river flow rate by measuring the river flow velocity with a flow coupe caliper. When measuring, it is necessary to determine the number of vertical and horizontal measuring points based on the depth and width of the channel. This method is simple, but it is easily affected by water quality and difficult to achieve continuous measurement.
5、 Acoustic Doppler Current Profiler is an abbreviation for Acoustic Doppler Current Profiler in English, which is developed using the principle of acoustic Doppler. It can simultaneously measure the cross-sectional shape, water depth, flow velocity, and flow rate of the riverbed, making it suitable for flow monitoring of large rivers. The main unit and transducer of the flowmeter are installed in a waterproof container, fully immersed in water during operation, and connected to a portable computer through a waterproof cable. The operation of the flowmeter is controlled on the portable computer. From the initial blind zone of over 1m, it has been reduced to the so-called zero blind zone, and the