Method for measuring abrasion rate of silt in mountain river
A measurement method and wear rate technology, applied in measurement devices, instruments, particle and sedimentation analysis, etc., can solve the problems of inaccurate measurement results of the measurement method, and achieve the effects of saving manpower, reducing material resources, and facilitating processing
Inactive Publication Date: 2016-03-23
SICHUAN AGRI UNIV
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Problems solved by technology
[0006] Aiming at the deficiencies of the prior art, the present invention provides a method for measuring the wear rate of sediment in rivers in mountainous areas, which can solve the problems of limitations in the use of existing measurement methods and inaccurate measurement results
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[0026] Embodiment: Take the sampling analysis of a 32km long river in Ya'an, Sichuan as an example. Sediment in the watershed is mainly produced at the source of the main river. The measurement is within the longitudinal range of 50m in the middle reaches of the river and there is basically no artificial interference, and the width of the flood period is about 40m. During the flood period, 180 particles of the original surface were retained on each surface of the selected shape of the entire water-passing section. The major axis of particle size ranges from 50 to 600 mm. The watershed is mainly composed of sandstone, and its initial sediment shape is relatively regular, the major axis and the central axis are similar in size, and the minor axis is obviously smaller. Generally, measure 3 times equidistantly in each axial direction. For a small part, due to the large size change along the axial direction, the interval should be reduced and the number of measurements should be ...
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The invention discloses a method for measuring the abrasion rate of silt in a mountain river, and belongs to the field of silt measurement. The method includes the steps that S1, a section of a riverway of the mountain river is selected, and the surfaces of grait in the section of the riverway are original surfaces; S2, the highest flow passing positions at measuring points under the flood condition are determined; S3, the grait with the original surfaces in whole river cross sections within a certain length range in the longitudinal direction of the riverway are selected and measured, and the sizes of the length axes, the sizes of the center axes and the sizes of the height axes of the grait are measured through a try square; S4, after the try square is arranged in place, pictures are taken, and the taken pictures are delivered into CAD for later-period data processing. The method has the advantages that by means of the method, measurement space limitation can be reduced; meanwhile, the number of measured grait particles can be decreased, the abrasion rate of the silt in the small mountain river can be rapidly measured accordingly, manpower and material resources are saved, and measurement time is greatly shortened. Later-period processing is convenient; in addition, the current shapes and the current sizes of the same objects are measured or the initial sizes of the same objects are inferred, and measurement accuracy can be improved.
Description
technical field [0001] The invention belongs to the field of sediment measurement, in particular to a method for measuring the wear rate of sediment in rivers in mountainous areas. Background technique [0002] Small watersheds in mountainous areas are the main producing areas of sediment, and the size of sediment is often large. When the sediment with larger particle size is initially formed, especially the sediment formed by sedimentary rock, the shape is often relatively regular, close to a cuboid or trapezoidal in cross section. However, after moving for a certain distance in the river, due to the friction between the sediment and the riverbed during the movement and the erosion of the sandy water flow, the particle size decreases along the course, and its shape gradually evolves as follows: figure 1 Shown: original shape → with certain edges and corners → oval pebble. [0003] The wear and tear along the course of the drifting sediment affects the change of the transp...
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CPCG01N15/0227
Inventor 漆力健王丽峰曾赟胡建毛熹王勇
Owner SICHUAN AGRI UNIV