Method for quantitatively detecting influence of freeze-thaw cycle on bed surface sediment exposure degree

A freeze-thaw cycle and quantitative detection technology, applied in the field of hydraulics and river dynamics, to achieve the effect of simple quantitative detection method and reasonable parameter values

Active Publication Date: 2022-04-05
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

However, the existing tests on the impact of freeze-thaw cycles on the exposure of bed surface sediment are all qualitative, and how to quantitatively detect the impact of freeze-thaw cycles on the exposure of bed surface sediment is a technology that needs to be solved urgently in this technical field. problem

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  • Method for quantitatively detecting influence of freeze-thaw cycle on bed surface sediment exposure degree
  • Method for quantitatively detecting influence of freeze-thaw cycle on bed surface sediment exposure degree
  • Method for quantitatively detecting influence of freeze-thaw cycle on bed surface sediment exposure degree

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Embodiment 1

[0064] In this example, according to the above-mentioned method steps, the quantitative detection of the influence of freeze-thaw cycles on the sediment exposure of the riverbed bank slope sediment taken from the Jicun section of Mohe River was carried out.

[0065] Step 1: Make the sample: Dry and sieve the riverbed bank slope sediment taken from the Jicun section of Mohe River. The sieve aperture is 1mm. respectively put into two sleeves 2 to make two soil samples, such as figure 2 As shown, the two soil samples are cylindrical structures with a bottom diameter of 50 mm and a height of 60 mm.

[0066] The dry density that records the silt that takes is 1.5g / cm in the present embodiment 3 , using a density of 1.2g / cm 3 The plastic balls are sieved as the spheroid model 1 of the sediment particles, and the sieve aperture is 1mm. Sprinkle sieved plastic balls on the surface of one of the soil samples and compact it as sample 1. The amount of plastic balls sprinkled ensures ...

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Abstract

The invention discloses a method for quantitatively detecting the influence of freeze-thaw cycle on bed surface sediment exposure degree. The method comprises the following steps: preparing a sample; pretreating the sample; photographing and recording the pretreated sample; performing freezing and thawing cycle treatment on the sample; and analyzing the sediment exposure degree condition according to observed data. According to the detection method, quantitative detection on the influence of the freezing and thawing cycle on the exposure degree of the bed surface sediment is realized, and the change amplitude of the relative exposure degree of the bed surface sediment before and after the freezing and thawing cycle can be directly and quantitatively given, so that the influence of the freezing and thawing cycle is quantitatively reflected. According to the quantitative detection method disclosed by the invention, the relative exposure degree of the surface sediment particles can be measured more simply, conveniently and intuitively from a microscopic angle, and the quantitative influence of freezing and thawing cycles on the relative exposure degree of the surface sediment particles is represented, so that reasonable parameter values can be realized when sediment transportation calculation is carried out in a cold region river channel.

Description

technical field [0001] The invention belongs to the technical field of hydraulics and river dynamics, and in particular relates to a method for quantitatively detecting the influence of freeze-thaw cycles on the exposure of bed surface sediment. Background technique [0002] In natural rivers, the position of sediment particles on the bed is one of the important factors affecting sediment movement. Due to the different sizes of sediment particles on the bed surface, there is a shielding effect between the particles. According to the relative position of the sediment on the bed surface, the existing technology uses the parameter of bed sediment exposure to characterize the difference between different sediment particle sizes. mutual influence. In fact, there are many factors that affect the exposure of sediment on the bed surface, such as hydraulic conditions, sediment particle size, and river bank type, etc. The above factors affect the force of sediment particles, and then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/00G01M10/00
Inventor 张磊黄海王大宇汪恩良王友胜刘承前陈娟李军丁昌春胡智丹李宇昂
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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