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Method and appts. for indoor simulating refloating state of underwater deposition

A technology for resuspension and sediment, which is applied in the sampling device and other directions, and can solve the problem of the sampling accuracy of water body that cannot be applied obliquely by the straight pipe method.

Inactive Publication Date: 2005-01-12
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned defects and provide a method and device for indoor simulation of underwater sediment resuspension state, which can solve the problems of inability to apply force obliquely and water sampling accuracy in the straight pipe method

Method used

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  • Method and appts. for indoor simulating refloating state of underwater deposition

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Embodiment

[0017] Embodiment: Taihu Lake is a typical large-scale shallow lake in my country, with an average water depth of 2m and an average bottom mud thickness of 0.78m. The probability of wind speed > 7.0m / s is about 17%, and August-October is often affected by 1-2 peripheral or frontal typhoons. Combined with the 10m wind field measurement, the underwater flow velocity was measured with a three-dimensional current meter, reflecting that waves are the main factor of underwater dynamic disturbance. The beating of waves transmits the force obliquely to the bottom of the lake about 2m deep, and the suspended particulate matter content in the lake water is 0.5m from the surface. Between 4-238g / m3, the water body 2cm away from the bottom can reach a maximum of 16000g / m3 or more. According to the actual situation of Taihu Lake, the parameters and shapes taken by the main parts of the resuspension device made by the applicant of this patent are: the straight pipe and the side pipe are circu...

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Abstract

Underwater dynamic force with intensity artificial controllable is applied in slant direction to not disturbed surface of sediment collected, making quantity of suspended particulate in water column close to vertical distribution state of practical situation in field. Simulation device is as following: a straight tube and a sloped tube are connected in Y shape. Assemble including agitator arm, blades, motor, sealed-bearing etc. is installed in the sloped tube. Sealed supporting tray is on bottom of the straight tube. Sampling mouths with valve are arranged on wall of the straight tube. The blades on the sloped tube are not extended to space enclosed by the straight tube.

Description

technical field [0001] The invention relates to mesoscale simulation for shallow lakes and river systems with frequent underwater dynamic disturbances, in particular to a method and device for indoor simulation of underwater sediment resuspension state. Background technique [0002] The surface sediments at the bottom of shallow lakes, marshes and rivers are often resuspended by dynamic and biological disturbances such as wind waves, currents, ships, and benthic animals. The degree of suspension often affects the physical properties, chemical substance migration and The distribution and biotransformation behavior of the water body will have a greater impact, and the ecological environment characteristics of the water body will also change to a certain extent. In order to study such natural phenomena, people often use two methods of outdoor observation and indoor simulation. Due to the uncontrollability of the size of wind waves and currents, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/10
Inventor 范成新
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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