A method for quantitatively detecting the effect of freeze-thaw cycles on bed surface sediment exposure
A freeze-thaw cycle and quantitative detection technology, applied in the field of hydraulics and river dynamics, to achieve reasonable parameter values and simple quantitative detection methods
Active Publication Date: 2022-07-01
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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Embodiment 1
[0064] In this embodiment, according to the above method steps, quantitative detection of the effect of freeze-thaw cycles on the sediment exposure is performed on the riverbed bank slope sediment taken from the Arctic Village section of Mohe River.
[0065] Step 1: Making a sample: Dry and sieve the riverbed bank slope sediment taken from the Arctic Village section of Mohe River, the sieving aperture is 1mm, add 10% of the weight of the sediment to make it into a sample, and then sieve it. Put them into two sleeves 2 respectively 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] In this example, the dry density of the obtained sediment was measured to be 1.5 g / cm 3 , with a density of 1.2g / cm 3 The plastic pellets are sieved as the spherical model 1 of the sediment particles, and the sieving aperture is the same as 1mm. Sprinkle the sieved plastic balls on th...
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Abstract
The invention discloses a method for quantitatively detecting the influence of freeze-thaw cycles on bed surface sediment exposure. The samples were subjected to freeze-thaw cycles and the sediment exposure was analyzed based on the observed data. The present invention realizes the quantitative detection of the effect of freeze-thaw cycle on the bed surface sediment exposure through the above detection method, and can directly quantitatively give the change range of the bed surface sediment relative exposure before and after the freeze-thaw cycle, thereby quantitatively reflecting the freeze-thaw cycle Impact. The quantitative detection method disclosed in the present invention is simpler and more intuitive to measure the relative exposure of surface sediment particles from a microscopic perspective, characterizes the quantitative influence of freeze-thaw cycles on the relative exposure of surface sediment particles, and can further be carried out in rivers in cold regions. Reasonable parameter values can be achieved in the calculation of sediment transport.
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 bed surface sediment exposure. Background technique [0002] In natural rivers, the position of sediment particles on the bed is one of the important factors affecting the movement of sediment. Due to the different particle sizes of the bed surface sediment particles, there is a shielding effect between the particles. mutual influence. In fact, there are many factors that affect the sediment exposure on the bed surface, such as hydraulic conditions, sediment particle size, and the type of river bank and beach. force, affecting the sediment transport process. In actual river channels in cold regions, such as the Northeast River Basin, the erosion of freeze-thaw cycles also has a significant impact on the exposure of the sediment bed. However, the existing tests on the...
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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