Simultaneous Measurement Method for Vertical Distribution of Suspended Fine Particulate Matter in Rivers

A technology of vertical distribution and synchronous measurement, which is applied in particle suspension analysis, suspension and porous material analysis, and measurement devices. It can solve problems such as complex implementation procedures, inability to achieve synchronous measurement, and interference with the concentration distribution of fine particle suspensions. To achieve the effect of inhibiting the development

Active Publication Date: 2021-10-15
SHANGHAI JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the problem that the existing technology easily interferes with the water flow to produce a new vortex, and then interferes with the concentration distribution of fine particle suspension; or the implementation procedure is complicated and cannot realize synchronous measurement, and proposes a vertical distribution method for suspended fine particle matter in a river The synchronous measurement method can realize multi-point synchronous rapid measurement of suspended fine particles on the same vertical line without disturbing the water flow and generating new turbulent vortexes, and can accurately obtain its instantaneous vertical concentration distribution mode

Method used

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  • Simultaneous Measurement Method for Vertical Distribution of Suspended Fine Particulate Matter in Rivers
  • Simultaneous Measurement Method for Vertical Distribution of Suspended Fine Particulate Matter in Rivers
  • Simultaneous Measurement Method for Vertical Distribution of Suspended Fine Particulate Matter in Rivers

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Embodiment 1

[0029] This embodiment is preferably carried out in an indoor rectangular cross-section water tank, the water tank is 0.8 m wide, 32 m long, the experimental water depth is 40 cm, and the water flow velocity is 0.2 m / s. Before the start of the experiment, 0.8 cm thick hollow glass beads were spread on the bottom of the tank. The glass beads had a diameter of 110 μm and a specific gravity of 2.0.

[0030] Such as figure 1 and image 3 As shown, the present embodiment includes: eight streamlined sampling bottles 1 are arranged in parallel along the same vertical direction and suspended on a carbon steel connecting rod 6 with a diameter of 2 mm, and the connection point is at the side of each sampling bottle at a position 9 cm away from the mouth of the bottle. . The distance between each sampling bottle 1 is 4cm, and the center line of the first sampling bottle at the bottom is 5cm away from the bed surface.

[0031] The diameter of the mouth of the streamlined sampling bottl...

Embodiment 2

[0042] This embodiment is preferably carried out in a section of natural straight river section with a width of 5.2m and a length of 16m, with a water depth of 100cm and a water velocity of 0.27m / s. The median diameter of suspended fine particulate matter in the river was 125 μm, and the mean square deviation was 83 μm.

[0043] Such asfigure 1 and image 3 As shown, the present embodiment includes 19 streamlined sampling bottles 1, arranged along the same vertical direction, suspended on the connecting rod 6, the connecting rod is a carbon steel rod with a diameter of 2mm, and the connecting point is at the side of each sampling bottle from the bottle. At the position of 9.5cm from the mouth. The distance between the 19 sampling bottles is 5 cm, and the centerline of the first sampling bottle at the bottom is 6 cm from the bottom bed surface.

[0044] The diameter of the mouth of the streamlined sampling bottle is 2.5mm; the uniform height of the bottle body is 2.6cm; the h...

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Abstract

A method for synchronously measuring the vertical distribution of suspended fine particulate matter in a river. A plurality of streamlined sampling bottles are arranged vertically and in parallel between the river surface and the bed surface of the river to be measured, and by setting the mouth of the bottle to face the direction of the incoming water flow. Realize synchronous measurement of vertical distribution; the thickness of the streamlined sampling bottle is uniform, and the bottle body is symmetrical along its central axis from the bottle mouth to the bottle tail. Because the present invention effectively suppresses the development of the wake vortex around the bottle body and does not change the distribution state of the fine particle suspended matter, the vertical parallel sampling of multiple sampling bottles is effective, and the instantaneous measurement of the vertical distribution of the suspended fine particle matter in the river can be realized .

Description

technical field [0001] The invention relates to a technology in the field of water environment restoration, in particular to a method for synchronously measuring the vertical distribution of suspended fine particles in rivers. Background technique [0002] Suspended fine particulate matter in rivers is usually composed of fine-grained sediment and various organic and inorganic pollutants. Their vertical distribution patterns in the water flow directly affect the transparency, lighting and food supply of aquatic animals. Therefore, observing its Vertical distribution has important basic theoretical significance for the growth and distribution of aquatic animals and plants in river ecosystems, and it also has practical guiding value for the implementation, maintenance and management of ecological water conservancy projects. [0003] At present, the existing measurement technology for suspended fine particles in rivers is to use single-point measurement, such as the use of acou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/10G01N15/06
CPCG01N1/10G01N15/06
Inventor 李艳红谢立全
Owner SHANGHAI JIAOTONG UNIV
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