A test method for simulating the release of sediment pollution under the action of river scouring

A test method and sediment technology, which are applied in the field of sediment pollution release under simulated river scouring, can solve the problems of manpower and time consumption, polluted troughs and reservoirs, and large volume of wave troughs. The effect of secondary pollution and high work efficiency

Active Publication Date: 2022-03-22
TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Many studies have been carried out on the release characteristics of sediment pollutants. This type of research is mainly based on physical model tests, in which the impact of water disturbance on the release of sediment pollutants is simulated by means of propeller, piston, and oscillation methods. Can not intuitively and accurately reflect the real flow conditions
The patent publication number is CN108645758A, and the patent name is a technical scheme disclosed in a method for analyzing the dynamic release of sediment pollutants. Although the indoor water tank test can simulate the real water flow situation, the volume of the wave flow tank required for the indoor water tank test is relatively large. , it is not easy to pave, collect and clean the bottom mud, and the pollutants will pollute the tank reservoir on a large scale; and under the action of circulating water flow, the dilution of pollutants is more serious. If samples are not taken in time, the pollutants will be diluted rapidly, which cannot be objective Shows trends in pollutant concentrations
The patent publication number is CN103869048A, and the patent name is a technical scheme disclosed in an annular tank device for simulating the resuspension and release of sediment pollutants. The effect of pollutant dilution is reduced, but the disturbance of unsteady flow during flow creation has a great influence on the simulation results
In the research using the flume device, the method of paving the sediment at the bottom of the flume is generally adopted, and it is impossible to study the influence of different thicknesses of the sediment on the release characteristics of pollutants. The cleaning seriously consumes manpower and time in the test process

Method used

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  • A test method for simulating the release of sediment pollution under the action of river scouring
  • A test method for simulating the release of sediment pollution under the action of river scouring
  • A test method for simulating the release of sediment pollution under the action of river scouring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] As shown in the figure, a test device for simulating the release of sediment pollution under the action of river erosion of the present invention includes: a leveling base 6, a test tank 19, a mud storage mechanism for adjusting the thickness of sediment, and a mud storage mechanism for simulating river erosion. A stream-making mechanism and a flowmeter 18 for measuring flow;

[0055] The test tank 19 is installed on the leveling base 6, and the test tank 19 is surrounded by the flow-making section 4, the test section 5 and two arc sections 20, and the flow-making section 4 is parallel to the test section 5 Set, the two ends of the flow-making section 4 and the test section 5 are respectively connected with two circular arc sections 20 to form an oblong test tank 19, and a concave flow-making groove 21 is formed on the inner wall 2 of the flow-making section 4, A test opening 24 is provided in the middle of the bottom of the test section 5, the width of the flow-making ...

Embodiment 2

[0068] On the basis of Embodiment 1, the leveling base 6 includes a support frame 22, and the front and rear ends of the support frame 22 are symmetrically formed with upward protrusions 23 so that the front and rear sides of the test tank 19 are clamped on the support. Rack 22.

[0069] Further, the supporting feet 7 are installed on the bottom of the supporting frame 22, and the supporting feet 7 have the function of rotating and fine-tuning the height. By adjusting the height of the supporting feet 7, the test tank 19 is in a horizontal state.

[0070] Furthermore, the flowmeter 18 is fixed on the top of the test section 5 with a mounting bracket, and the flowmeter 18 is an ultrasonic flowmeter 18 .

[0071] Furthermore, the flow-making paddle 16 adopts a three-blade paddle, and the height of the flow-making paddle 16 is the same as that of the test tank 19, and is driven by a variable-speed motor 17 to simulate different river dynamic conditions in the flow-making section ...

Embodiment 3

[0073] Taking the Qilihai Lagoon wetland in Changli National Nature Reserve, Hebei Province as an example, the rivers entering the Qilihai Lagoon are all seasonal rivers, and the annual flow varies greatly, and the average monthly runoff varies from 0 to 2m 3 / s, the average water depth of the river is 0.5m, and the average velocity of the river is 0-0.1m / s. The test device described in Example 1 is used to study the mechanism of sediment release in the Qilihai Lagoon and rivers entering the lake, so as to provide a theoretical basis for engineering environmental assessment and environmental management.

[0074] On the basis of embodiment 1, utilize the test method described in embodiment 1 to simulate the test method of sediment pollution release under the action of river channel scouring, and the application in researching the influence of sediment thickness on sediment discharge specifically comprises the following steps:

[0075] (1) According to the river and lake conditi...

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Abstract

The invention discloses a test method for simulating the discharge of bottom mud pollution under the action of river channel scouring. The test device is prepared, and the water depth and flow velocity in the test water tank are preset and tested according to the test requirements, and the flow rate in the test water tank is calculated according to the flow velocity; The bottom mud is laid in the mud storage box, so that the water baffle covers the upper surface of the bottom mud; the preset water depth is added to the test tank, and the variable speed motor is started to drive the flow to make the flow reach the required flow and keep the flow rate constant. change; when the water flow is constant, the water retaining plate shrinks to expose the surface of the sediment; open the sampling port for layered sampling; use a water quality analyzer to measure the water; respectively measure the variation and verticality of the concentration of sediment pollutants under different simulated dynamic conditions. distribution characteristics. The flow-making paddle creates flow in the narrow flow-making section and reduces the scale of the flow-making. The retractable water baffle reduces the disturbance effect on the sediment during the initial flow-making. for various tests.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a test method for simulating the discharge of sediment pollution under the action of river erosion. Background technique [0002] With the continuous acceleration of the urbanization process, a large amount of industrial and agricultural wastewater and human activity sewage are discharged, and industrial and domestic garbage are dumped into rivers and lakes, resulting in water environmental problems such as eutrophication and heavy metal pollution. The sedimentation and accumulation of pollutants in the sediment of rivers and lakes will move forward and diffuse to the upper water body under the action of self-diffusion and external force, causing obvious "secondary pollution" to the water body, making the endogenous pollution of the sediment more and more serious. Seriously, especially in estuary areas with complex hydraulic conditions, the endog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M10/00G01N33/24G01N33/18
CPCG01M10/00G01N33/24G01N33/18G01N33/1806G01N33/1813G01N11/04
Inventor 董智超刘丹忠侯晋芳刘爱民徐宾宾
Owner TIANJIN PORT ENG INST LTD OF CCCC FIRST HARBOR ENG
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