A Calculation Method of River Section Discharge Based on Non-Contact Radar Current Measurement

Abstract

The invention provides a method for calculating the riverway cross-section flow measured by a non-contact radar. On a riverway cross-section on which a radar probe measurement point is located, cross-section measurement is carried out at a certain distance interval, based on the measured cross-section data, the cross-section polynomial curve fitting is carried out, and the riverway cross-section water surface slope is calculated by combining with a hydraulics manning formula according to the position of a probe, the actually-measured water level, the surface flow velocity and the bed roughness, then based on a hydraulics natural riverway flow calculation principle, a certain number of vertical lines are chosen to divide the riverway cross-section evenly, the depth of water of the verticallines and the corresponding vertical line flow velocity are calculated in sequence, and then virtual vertical lines are made in interval midpoint of each vertical line, a plurality of virtual verticallines and cross-section fitted curves and a riverway water line form a plurality of irregular polygons, the area of each polygon is calculated in sequence, and finally, a weighted area method is usedfor calculating the flow of a riverway large section. The method for calculating the riverway cross-section flow measured by the non-contact radar has important practical value for the popularizationof online flow measurement technology and the high real-time flow monitoring of flood prevention.

Description

technical field [0001] The invention relates to the field of hydrological surveying and reporting, in particular to a method for calculating the flow of a river section by non-contact radar flow measurement. Background technique [0002] River channel flow measurement is a periodic dynamic measurement of the real-time flow of a river, which can provide basic data support for flood control, hydrological and hydraulic calculations, water resource evaluation and management, etc., and is useful for mastering water regime and water resource status, flood prevention and disaster reduction, and reasonable allocation Water resources and infrastructure across or near rivers are of great significance. At the same time, it is also an important part of hydrological work, and it needs to spend a lot of manpower and material resources to complete the test task every year. [0003] Traditional flow measurement methods are based on contact measurement, and commonly used equipment includes ...

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Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a method for calculating the flow rate of a river section by non-contact radar flow measurement. On the basis of the non-contact radar measured river water level and surface velocity, the hydraulic natural river flow test and calculation principle And computer simulation is used as the calculation basis and means of obtaining the average flow of the river section to solve the problem that the non-contact radar current measurement technology cannot obtain the flow of the river section

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