A temperature difference-sediment coupled hyperpycnal flow simulation test device and method for stratified reservoirs

Abstract

The invention discloses simulating testing device and method for temperature difference-sediment coupling density current of a stratified reservoir. The device comprises a reservoir model, a buffering tank, a muddy water tank, a water draining tank, etc. The method comprises the steps of 1) switching on an air conditioner to control the temperature of water in the reservoir model through a condensing pipe, so as to form an epilimnion, a thermocline and an isothermal layer from top to bottom in a sequence; 2) preparing sand-containing muddy water with a certain concentration in the muddy water tank, uniformly agitating, measuring the temperature of water in the muddy water tank and the reservoir model, switching on the pump and adjusting the flow rate to reach a value as requirement, opening and adjusting a water outlet valve at a draining opening in the bottom part of the reservoir model at the same time to enable Q (input) to be equal to Q (output), and then starting to time; 3) selecting five sections at intervals of 50cm, 50cm, 50cm and 30cm from left to right along the horizontal direction of the reservoir model from the water outlet, arranging a sampling opening at every vertical interval of 5cm in each section, sampling at regular intervals, and measuring the temperature of water at different level of each section; 4) measuring the turbidity the water sample obtained in step (3), and analyzing the data.

Description

technical field [0001] The invention belongs to the field of water quality pollution control of reservoirs, and relates to the simulation experiment research on the density flow of stratified reservoirs, in particular to a temperature difference-sediment coupling density flow simulation test device and method of layered reservoirs. Background technique [0002] Hyperpycnal flow is two or more fluids in contact with each other. When there is a certain difference in density, one of the fluids is along the direction of the interface, and different fluids may have a certain degree of friction at the interface and other special localities. Blending phenomenon, but there will be no global blending phenomenon during the movement. Density current is a common phenomenon in nature. Sometimes it is necessary to prevent or reduce the formation of densities (such as the invasion of densities in the cecum section of the approach channel of the ship lock, the invasion of densities in sedim...

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Problems solved by technology

[0004] Sediment is the carrier of many pollutants, dissolved salts, waste heat, etc. The pollutant load carried by the sediment hyperpycnal flow in the rainstorm season generally accounts for more than 70% of the total annual pollutant load of the reservoir. To study how the sediment is transported in the reservoir It plays a very important guiding role in stratified water intake at different elevations in the reservoir, such as municipal water supply and irrigation water, and in maintaining the ecological environment in the reservoir area. However, limited by the development of the physical model of stratified reservoirs and the simultaneous sampling of sediment at different locations, the research on sediment hyperpycnal flow in stratified reservoirs is relatively lagging behind.

[0005] At present, the heating method is basically used in the hyperpycnal flow test system to obtain the physical model of the stratified reservoir. However, the water temperature stratification of this method is limited by the air temperature, so it is difficult to control, and the heating rod also affects the water flow.

Due to the various evolution forms of hyperpycnal flow, simultaneous sampling of sediment at different locations has not been a feasible method; the concentration of sediment has also been measured by drying and weighing, which is time-consuming and laborious

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