Experimental apparatus of oversaturation total dissolved gas in dam water discharging downstream water

Abstract

The invention relates to an experimental device for supersaturated total dissolved gas of the downstream water body of discharging water of a dam. The device comprises a water column, valves, a flowmeter, an air compressor, a manometer, a total dissolved gas tester and a stirrer. A first valve and the flowmeter are respectively connected with the bottom of the water column by a pipeline, the outlet of the air compressor is communicated with the flowmeter by a second valve through one end of a three-way pipe, and is communicated with the atmosphere by a third valve through the other end of thethree-way pipe; the scale position on the wall of the water column is connected with a latex pipe which is connected with the manometer; the total dissolved gas tester and the stirrer are independent, and the total dissolved gas tester is placed into the water column when measuring. The device of the invention can measure and control main physical parameters which influence the generation and release of supersaturated total dissolved gas such as water body pressure, aerification quantity, water depth and turbulent strength, so as to carry out quantitative analysis to the total dissolved gas, and therefore the device of the invention has important promoting effects for the protection of river aquatic ecological environment and the establishment of ecology friendly hydraulic engineering.

Description

technical field [0001] The present invention relates to a water body total dissolved gas (TDG) supersaturation technology, in particular to an experimental device which can be used for the research on the generation and release law of the supersaturated total dissolved gas in the downstream water body when the dam discharges, and belongs to the water conservancy engineering dissolved gas supersaturation technology. Saturated technology field. Background technique [0002] In many large-scale water conservancy projects in my country, according to their water volume dispatching requirements, water conservancy projects need to discharge water to downstream rivers through spillways, flood discharge tunnels and other discharge structures. When the dam discharges, its water flow will be accompanied by a large amount of aeration. This large flow and strong aeration flow will appear supersaturated dissolved gas in the downstream channel of the dam, and this supersaturated dissolved ...

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Problems solved by technology

The main difficulties of this research method are: (1) Due to the small scale of the experimental model, the small amount of gas mixed and the small pressure of the gas mixed, it is difficult to produce the phenomenon of total dissolved gas supersaturation; (2) the water cushion pond under the dam The problem of similarity between the model and the actual prototype of physical parameters such as complex water flow phenomena, aeration, and total dissolved gas distribution has not been resolved, and the measurement results of the model experiment cannot be "magnified" to the actual prototype; (3) Most measuring instruments are unavoidable Locally changing the flow field, temperature field, concentration field, etc., resulting in certain errors in the measurement results

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