Analysis method, device, medium and equipment for original river channel gradient of ancient river deposition

Abstract

The invention relates to an original river channel gradient analysis method, device, medium and equipment for ancient river deposition. The method comprises the following steps of a, selecting a completely stored river channel, and measuring the sediment density, the sediment particle size median, the river water density and the river channel full bank depth on a riverbed; b, calculating effective relative density of the sediment based on the sediment density and the river water density; c, calculating the particle Reynolds number of the sediments under the full-bank water depth condition based on the effective relative density of the sediments and the particle size median of the sediments; d, calculating the critical starting stress of the sediment on the basis of the particle Reynolds number of the sediment under the full-bank water depth condition; e, calculating a riverbed critical water flow velocity based on the critical starting stress of the sediment; f, based on the riverbed critical water flow velocity and the riverway full bank depth in the step a, calculating the average water flow velocity of the cross section of the riverway; and g, on the basis of the average water flow speed of the cross section of the river channel in the step f and the river channel full bank depth in the step a, calculating an original river channel gradient.

Description

technical field

[0001] The invention relates to an analysis method, device, medium and equipment for calculating the 'primitive river gradient' of ancient river deposits, and belongs to the technical field of ancient river geological structure and geomorphology. Background technique

[0002] Fluvial sediments are the most important type of continental sediments, widely distributed in various parts of sedimentary basins, and are the most important component of continental sedimentary strata. The sedimentological and morphological characteristics of ancient rivers can be used as important indicator parameters of paleogeography, which is crucial for restoring paleoenvironment and paleogeomorphology. Among them, the 'primitive channel gradient' can effectively reflect the characteristics of paleostructure (such as terrain slope) and paleogeomorphology (such as river type), which is of great significance for the study of paleoenvironment and paleogeography. However, the ancient ...

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