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Device and method for simulating resuspension of sediment under action of vertical wind-driven circulation in shallow lake

A sediment and resuspension technology, which is used in measurement devices, fluid dynamics tests, and testing of machine/structural components to achieve the effect of small footprint, simple structure and stable flow field

Inactive Publication Date: 2013-01-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a device and method that is more in line with the sediment resuspension process under the wind-induced flow conditions of natural shallow lakes in view of the defects existing in the current simulation device

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  • Device and method for simulating resuspension of sediment under action of vertical wind-driven circulation in shallow lake
  • Device and method for simulating resuspension of sediment under action of vertical wind-driven circulation in shallow lake
  • Device and method for simulating resuspension of sediment under action of vertical wind-driven circulation in shallow lake

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specific Embodiment approach

[0027] A device for simulating sediment resuspension under the action of wind-induced vertical circulation in shallow lakes. The specific implementation method is:

[0028] The device consists of a rectangular tank, water propulsion power system and flow rate measurement device, see Figure 1-Figure 3 , the rectangular water tank 1 is made of plexiglass with a thickness of 1 cm, and is 50 cm long, 38 cm wide, and 48 cm high. Flanging is pasted around the upper mouth, and the flange is a plexiglass strip with a width of 5 cm and a thickness of 2 cm. Six sampling holes 10 with valves are arranged sequentially from top to bottom, the distance between each sampling hole 10 with valves is 5cm, the hole diameter is 0.4cm, and the lower end of the outer wall of the annular water tank is provided with a drain hole 11 with valves, the hole diameter is 0.4cm;

[0029] The water propulsion power system is installed above the water tank 1, and the system includes two parts, the power sys...

Embodiment 2

[0034]A method for resuspension of sediments using a device for simulating sediment resuspension under the action of wind-induced vertical circulation in shallow lakes, characterized in that the steps of the method are as follows:

[0035] A. Place the 5cm thick sediment 12 collected without disturbance on the bottom of the rectangular water tank 1;

[0036] B. Add the overlying water 13 with a water depth of 25cm in the water tank 1 by the siphon method;

[0037] C. Insert one end of the four long nails 7 into the second drill hole 8 counted from bottom to top of the four plexiglass strips, and place the other end on the flange of the upper mouth of the water tank 1 to make the water flow into the power equipment The bottom surface of the conveyor belt 6 is in contact with the surface of the overlying water 13;

[0038] D. Turn on the frequency conversion speed regulation motor 3, set the speed to 90r / min, the motor shaft drives the lower bearing 5 to rotate through the rubb...

Embodiment 3

[0042] A method of sediment resuspension using a device that simulates sediment resuspension under the action of wind-induced vertical circulation in shallow lakes. In a specific implementation method, the speed of the speed-regulating motor 3 is changed to 110r / min, and the rest are the same as in the embodiment 2. The longitudinal section flow field with a water depth of 25cm and a rotational speed of 110r / min can be obtained. For details, see Figure 5 , The measured ss values ​​were 940mg / l and 920mg / l respectively.

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Abstract

The invention discloses a device and a method for simulating resuspension of sediment under action of vertical wind-driven circulation in a shallow lake, and belongs to the field of environmental protection. The device comprises a rectangular water tank, a water flow propelling power system and a flow rate measuring device. The height of the water tank is not smaller than 30cm, and the length-width ratio is not smaller than 1.2. The sediment collected without disturbance and 5cm in thickness is laid at the bottom of the water tank. A conveying belt arranged on a water surface is driven by a variable-frequency speed regulating motor so as to drive water of the water surface to move, the water sinks to the surface of the sediment after reaching the edge wall of the water tank, and then moves in an opposite direction, so that a vertical wind-driven circulation structure commonly existing in shallow lake wind-driven flow on a longitudinal section is formed, and the process of resuspension of the sediment under action of vertical wind-driven circulation in the shallow lake on conditions of different wind strength and different water depth can be simulated. A flow rate measuring instrument is positioned accurately by the flow rate measuring device, and then a wind-driven circulation field formed on the longitudinal section of the rectangular water tank can be observed. The device has the advantages that the vertical wind-driven circulation structure formed in the shallow lake on the conditions of different wind strength and different water depth is simulated vividly, and thus the process of resuspension, driven by the wind-driven circulation, of the sediment at the bottom of the lake, can be observed.

Description

technical field [0001] The invention relates to a device and method for sediment resuspension under the action of wind-induced vertical circulation in shallow lakes, which is suitable for simulating lakes under the action of different sizes of circulation flow rates formed vertically by shallow lakes under different wind strengths and water depths The process of resuspension and pollutant release of bottom sediments is an experimental device for the study of the interface characteristics of shallow lake water and sediments. Background technique [0002] There are many lakes in our country. With the rapid economic development and population increase, the irrational use of lake resources and the random discharge of sewage and waste have brought more and more serious environmental problems, especially the water quality pollution and pollution of shallow lakes in the middle and lower reaches of the Yangtze River. The problem of eutrophication is very prominent. At present, the ...

Claims

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Application Information

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IPC IPC(8): G01M10/00
Inventor 华祖林顾莉褚克坚汪靓刘晓东白雪巫丹徐龙龙惠慧
Owner HOHAI UNIV
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