Method for identifying influence amplitude of riverway adjustment on water level by utilizing horizontal residual errors

Abstract

The invention provides a method for identifying the influence amplitude of river regulation on the water level by utilizing a leveling residual error, which comprises the following steps of: 1, eliminating the influence of backwater jacking, and determining a multi-year average water level-flow function relationship of a river section inlet; 2, calculating a water level residual error under the characteristic flow according to the actually measured flow water level value and the multi-year average water level-flow function relationship; 3, drawing a change graph of annual average water level residual error along with time under a specific flow level in the coordinate plane by taking the year as a transverse axis and the annual average residual error as a longitudinal axis, and identifyinginterannual characteristics of water level change under the specific flow level on the basis of the change graph, so as to obtain a water level accumulated amplitude [delta]Z from the Nth year to theMth year; 4, quantitatively analyzing the influence effect of riverbed erosion and deposition and roughness factors; and 5, repeatedly executing the steps 2-4 to obtain water level accumulated amplitude components [delta]Zb and [delta]Zr under each characteristic flow level caused by riverbed erosion and deposition and roughness adjustment, thereby determining the influence amplitude of riverway adjustment on the water level.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and water transportation engineering, and in particular relates to a method for identifying the range of influence of river course adjustment on water level by using anomaly residuals. [0002] technical background [0003] Water level is an important object of river hydrological monitoring. For a river in a quasi-equilibrium state, the erosion and silting deformation of the river channel is small, and the water level at a specific flow rate is relatively stable, and the occurrence probability of the water level is determined by the flow frequency. Using long series of hydrological observation data to carry out frequency statistics to obtain flood control design water level, navigation design water level and channel improvement water level is an important basis for the design of embankment and flood control projects, channel improvement, coastal water intake and wading engineering. [00...

AI Technical Summary

Problems solved by technology

This method involves repeated curve fitting and interpolation calculations, and the workload is relatively large

[0006] In addition, in alluvial rivers, the change of water level in a specific river section is often caused by the change of water level at downstream measuring stations, the scouring and silting of the interval riverbed, and the adjustment of roughness. The water level variation not only has low accuracy and a large amount of calculation, but also cannot separate the influence of various factors, it is difficult to identify the main causes of water level changes, and it cannot provide sufficient support for engineering practices such as water level change trend judgment and regulation

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