Physical model for affecting layered reservoir water temperature structure by silt carrying flow and experimental method

A physical model and water temperature technology, applied in the hydraulic model, etc., can solve the problems of affecting the discharge water temperature, difficult research, difficult to capture, etc., and achieve the effect of reducing fluctuation error and uneven error

Active Publication Date: 2018-07-17
CHINA THREE GORGES CORPORATION +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

If the front moves to the front of the dam and cannot be removed in time, it will surge and climb in front of the dam, further destroying the stratified structure of water temperature in front of the dam and affecting the temperature of the discharged water.
The interaction mechanism of water temperature and sediment coupling is complex, and it involves many fields such as environmental hydraulics, ecology, hydraulics and hydraulics, and its research is extremely difficult. At present, research on this mechanism is still relatively scarce
[0004] Prototype observation of the influence of sand-laden water flow on temperature-stratified reservoir water temperature structure is costly, and it is difficult to capture the process of the influence of the hyperpycnal flow formed by sand-laden water flow on the water temperature in the reservoir area, and it is difficult to grasp the timing of observation

Method used

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  • Physical model for affecting layered reservoir water temperature structure by silt carrying flow and experimental method
  • Physical model for affecting layered reservoir water temperature structure by silt carrying flow and experimental method
  • Physical model for affecting layered reservoir water temperature structure by silt carrying flow and experimental method

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Experimental program
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Embodiment 1

[0047] Such as Figure 1-3 , a physical model of the influence of sand-laden water flow on the water temperature structure of a stratified reservoir, which includes an inflow circulation system 33 for preparing and providing sand-laden water, and the inflow circulation system 33 is used for simulating a stratified reservoir The experimental water tank system 34 of the experiment is connected, and the experimental water tank system 34 is connected to the water outlet system 35 . The water inlet circulation system 33 and the experimental water tank system 34 are provided with a temperature monitoring device and a flow field monitoring device. The physical model of the whole experiment is formed by the above three systems.

[0048] Further, the water inlet circulation system 33 includes a sand-containing water preparation tank 1, and the sand-containing water preparation tank 1 is connected with an outlet pipe 2, and a centrifugal pump 3 and a flow meter 4 are sequentially instal...

Embodiment 2

[0055] The instrument and equipment source used in this embodiment is as follows:

[0056] 1. The temperature recorder adopts the LG93-22 thermometer produced by Hangzhou Luge Technology Co., Ltd., the measuring range is -40-100°C, the accuracy is ±0.2°C, the temperature of the measuring point is recorded continuously, and the sampling frequency is 2s;

[0057] 2. The centrifugal pump adopts the LWGY-DN15 turbine flowmeter, and its flow measurement range is 0.6~6m 3 / h;

[0058] 3. The particle size of the sand used in the experiment was analyzed by a Malvern laser particle size analyzer (Mastersizer 2000), and the measured particle size ranged from 0.02 μm to 2000 μm.

[0059] 4. The two-dimensional flow field measurement equipment adopts the PIV measurement equipment of TSI Company, the image analysis software adopts INSIGHT4G, and the laser adopts Regal laser.

[0060] 5. The size of the water inlet tank is 30cm×30cm, the overflow depth of the inlet is 55cm, the total wid...

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Abstract

The invention relates to a physical model for affecting a layered reservoir water temperature structure by silt carrying flow and an experimental method, and belongs to the technical field of water environment research in water resource and hydropower engineering. According to the method, the influence on the vertical water temperature of a reservoir by the silt carrying flow can be simulated in alaboratory by controlling the inflow sand content, water temperature and initial vertical water temperature distribution of environmental water. A PIV two-dimensional flow field measuring device is adopted to effectively capture the silt carrying flow, density current forward flow field distribution is formed, and important flow field verifying data are provided for model verification of numerical simulation. Quartz sand is adopted to simulate suspended sediments in the silt carrying flow in testing, and the phenomenon that the silt carrying flow forms bottom density currents and inter-layerdensity currents to influence the water temperature structure is successfully simulated. An electrical heating bar is adopted in a heating device for heating at a water temperature thermocline position, the heating speed is higher compared with that of an existing lamplight heating mode, the thermocline position can be controlled conveniently, and the initial temperature field can be controlled more accurately.

Description

technical field [0001] The invention relates to the field of research on the water environment of water conservancy and hydropower projects, in particular to a physical model and an experimental method for the influence of sandy water flow on the water temperature structure of a stratified reservoir. Background technique [0002] The construction of water conservancy projects, especially the construction of large high-dam reservoirs, provides a strong guarantee for flood control, water supply, power generation and shipping in the basin. The successive development and utilization of hydropower resources in major river basins in my country, especially the development of cascade power stations, has changed the natural runoff properties of rivers, and the water temperature of the disturbed river section has changed significantly in time and space, and the vertical temperature of the reservoir area has a layered structure. Compared with the natural historical water temperature, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B1/02
CPCE02B1/02Y02A10/40
Inventor 秦蕾蕾於三大李嘉李克锋董先勇权录年梁瑞峰严忠銮
Owner CHINA THREE GORGES CORPORATION
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