A Quantitative Characterization Method of Plane Morphological Parameters of Channel Beach Sandbody

Abstract

The invention discloses a quantitative characterization method of channel sand body plane shape parameters. First, the construction angle α and the convergence angle β are determined, wherein the construction angle α is the plane angle of the channel sand body to be measured in the upstream direction, and the convergence angle β is For the plane angle of the channel sand body to be measured in the backwater direction, use the vertex of the construction angle α as the coordinate origin, and then define the X-axis and Y-axis of the coordinate system, where the east-west direction is the X-axis, and the east direction is positive; the north-south direction is Y axis, northward is positive, then divide the boundary line of the channel sand body into multiple segments, and make a circle with the intersection points between the segments, so that the distance between the circular boundary and the channel sand body to be measured between two adjacent intersection points The boundary lines coincide, so that the comprehensive construction angle α, convergence angle β, coordinate system, coordinates of each intersection point, coordinates of each circle center, and the corresponding arc lengths can accurately characterize the planar shape of the channel sand body quantitatively through parameters, and the characterization results It is more accurate and closer to the shape of natural channel sand bodies.

Description

technical field [0001] The invention belongs to the technical field of quantitative characterization of braided river sediments, and in particular relates to a method for quantitative characterization of channel beach sand body plane shape parameters. Background technique [0002] At present, at home and abroad, there are two ways to characterize the planar shape of braided channel sand bodies, one is qualitative expression: for example, "the center bar sand body is spindle-shaped on the plane, and has a flat bottom and a convex top on the profile"; The other is to directly use numbers for quantitative characterization: for example, "the average thickness of channel sand bodies is 3m, the average length is 700m, and the average width is 250m". These two methods have different degrees of disadvantages, mainly in: [0003] (1) Qualitative characterization method: Although this method can vividly express the planar shape of channel sand bodies, it lacks the concept of absolute...

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