Method and device for measuring sediment group settling velocity

A measurement method and technology of measurement device, which are applied in measurement device, fluid velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problems of lowering the liquid level of the settling cylinder, increasing the difficulty of data analysis, and heavy workload.

Inactive Publication Date: 2014-01-22
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

The workload of this method is very large, and because the liquid level in the settling cylinder will be reduced by taking samples, it will increase the difficulty of data analysis

Method used

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  • Method and device for measuring sediment group settling velocity
  • Method and device for measuring sediment group settling velocity
  • Method and device for measuring sediment group settling velocity

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Embodiment Construction

[0028] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] The basic principle of the present invention is: uniformly install the pressure measuring equipment along the height direction of the settling tank, fill the uniformly stirred slurry into the settling tank and let it stand, and the sand concentration will change with time due to sediment settlement, resulting in the pressure measuring equipment The measured pressure changes over time. Since the pressure and the sediment concentration have a strict mathematical correspondence, the change process of the sediment concentration can be calculated by measuring the change process of the pressure, and then the group settlement velocity of the sediment can be calculated.

[0030] Based on the above principles, the measuring device used in a method for measuring sediment mass settling velocity of the present invention is as foll...

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Abstract

The invention relates to a method and a device for measuring sediment group settling velocity and belongs to the field of river model tests. The device comprises a settling barrel, a plurality of pressure measurement devices and a computer, wherein the settling barrel is a cylindrical container which is placed perpendicularly and provided with a cross section of any shape; a plurality of pressure measurement holes are uniformly and perpendicularly formed in one side wall; no less than 3 pressure measurement holes are provided; the pressure measurement devices are perpendicularly mounted in the pressure measurement holes and are sealed with the side wall; centers of sensing elements of the pressure measurement devices are aligned with centers of the pressure measurement holes; the pressure measurement devices are connected with the computer; the pressure intensity is measured under the control of the computer; and a measurement result is returned to the computer for analysis and storage in real time. The method calculates a change process of the sediment concentration by measuring a change process of the pressure intensity, and the sediment group settling velocity is calculated further. According to the method and the device, the sediment group settling velocity in a sandy water body can be measured automatically, without interference and accurately.

Description

technical field [0001] The invention belongs to the field of river engineering model tests, in particular to the measurement of sedimentation velocity of sediment groups. Background technique [0002] In the basic theoretical research and engineering application of sediment movement, the mass sedimentation velocity of sediment is an important parameter. For a single spherical particle, the settling velocity of the fine particle can be calculated by the Stokes formula, the settling velocity of the coarse particle can be calculated by the resistance formula, and the settling velocity of the particle in the transition zone between the coarse and fine particles needs to be measured experimentally; The settling velocity of irregularly shaped particles such as natural sand also needs to be determined through experiments. The traditional single particle settling velocity test is generally to put one particle at a time into a special settling cylinder, record the settling distance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/00G01N15/04
Inventor 陈启刚李文杰李丹勋钟强王兴奎
Owner TSINGHUA UNIV
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