Fine-particle sediment underwater repose angle measuring device and measuring method thereof

Abstract

The invention provides a fine-particle sediment underwater repose angle measuring device and a measuring method of the fine-particle sediment underwater repose angle measuring device. The fine-particle sediment underwater repose angle measuring device comprises a glass water tank, a floating plate, a funnel, a transparent testing circular platform and a plastic rod. Leveling knobs are installed on the outer side of the bottom of the glass water tank, rulers are engraved on the portions, with the same height, of four side walls, and two water pipes are symmetrically installed in the middles of the bottoms of a pair of side walls respectively; the floating plate is arranged in the glass water tank, a hole is formed in the middle of the floating plate, the funnel is fixedly arranged in the hole, and the floating plate and the funnel are combined into a whole; flat-pressing holes are symmetrically formed in the wall of the portion, below the floating plate, of the funnel; the transparent testing circular platform is fixed to the middle of the bottom of the glass water tank and is used for bearing a sediment sample leaking from the funnel; a leveling bubble is arranged in the center of the interior of the transparent testing circular platform, and the leveling bubble, the transparent testing circular platform and the funnel are coaxial; the plastic rod is arranged inside the funnel and is used for opening or closing an opening of the funnel. The fine-particle sediment underwater repose angle measuring device and the measuring method of the fine-particle sediment underwater repose angle measuring device overcome the defects that an existing method is complex in step and interference factors are multiple, operating steps can be effectively simplified, sediment cone forming stability is improved, and therefore the measuring speed is increased, and measuring accuracy and measuring reproducibility are improved.

Description

technical field [0001] The invention relates to the measurement of the underwater angle of repose of fine-grained silt in the water conservancy industry, in particular to an underwater angle-of-repose measuring device and method for fine-grained silt. Background technique [0002] The underwater angle of repose is one of the important parameters reflecting the physical characteristics of sediment. It involves many topics in the basic research of sediment movement mechanics and engineering practice. It is of great significance in the aspect of local riverbed deformation process. The underwater angle of repose of sediment is affected by many factors such as sediment gradation, morphological characteristics, surface properties and compactness (for silt). Although previous researchers have obtained some empirical and semi-empirical formulas, there are large discrepancies between them, and it is difficult to conduct a comprehensive analysis in theoretical research. Therefore, in...

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Problems solved by technology

The steps of the natural silting method are cumbersome and rough, and it is easy to interfere with the shape of the sediment cone and affect the accuracy; although the disc method has improved the natural silting method, from the perspective of its device, the mortar passes through the hose from a high place. When it flows down, a jet flow is easily formed at the nozzle to destroy the slope shape of the sediment cone, which will also affect the accuracy

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