Method for detecting settling velocities of suspended sediment groups

A detection method, a technology of suspended mass, applied in the direction of fluid velocity measurement, velocity/acceleration/shock measurement, measuring device, etc., which can solve the problems of low measurement accuracy and narrow application range

Active Publication Date: 2014-03-26
重庆交大国科航科技有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting the settling velocity of suspended sediment mass, aiming...

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  • Method for detecting settling velocities of suspended sediment groups
  • Method for detecting settling velocities of suspended sediment groups
  • Method for detecting settling velocities of suspended sediment groups

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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] figure 1 Shows the flow chart of a method for detecting the settling speed of suspended sediment groups, as shown in the figure, the present invention is realized in this way, a method for detecting the group settling speed of suspended sediments includes assuming a constant state, water flow There is no concentration gradient in the direction, the diffusion equation is simplified S101, the assumption S102 is made according to the sediment diffusion theory, the instantaneous flow velocity and the instantaneous sediment concentration synchronous with the flow velocity S103 are obtained throu...

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Abstract

The invention discloses a method for detecting settling velocities of suspended sediment groups. The method includes reducing a diffusion equation under hypothetic conditions of constant states and zero concentration gradients of water flow directions; performing hypothesis according to a sediment diffusion theory; acquiring instantaneous velocities and instantaneous sediment concentration synchronous with the velocities by the aid of an ADV (acoustic Doppler velocimeter); finally acquiring the settling velocities of the suspended sediment groups. The method has the advantages that the method is applicable to laboratories and fields, and can be applied to fine-grained suspended loads no matter whether flocculation actually occurs or not, distribution of the settling velocities along the depth of water and change of the settling velocities along with the sediment concentration can be measured by the method, and an effect of the method is superior to an effect of the traditional measuring method.

Description

technical field [0001] The invention belongs to the field of research on the settling velocity of sediment particles, in particular to a detection method for the settling velocity of a suspended sediment mass. Background technique [0002] Among the four main physical processes of fine-grained sediments, that is, erosion, settlement, deposition and consolidation, the sedimentation velocity is a particularly important link for understanding and simulating sediment transport. In the theoretical study of the sediment velocity of sediment particles, the sedimentation characteristics of single particles have been basically clarified, the sedimentation of coarse particles is mainly controlled by inertia, the resistance coefficient of the flow around is constant, and the Reynolds number is high (Re>103), while the sedimentation of fine particles It is mainly controlled by viscosity, and the Stokes formula suitable for low Reynolds number (Re<=0.4) is generally used. For susp...

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Application Information

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IPC IPC(8): G01P5/00G01N15/04
Inventor 胡江付旭辉杨胜发李文杰陈阳吴国茂徐威震李斌强
Owner 重庆交大国科航科技有限公司
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