River discharge comprehensive measuring and calculating method and system

Abstract

The invention discloses a river discharge comprehensive measuring and calculating method and system in the technical field of hydrologic survey and aims at solving the technical problems that a discharge online measurement method is high in cost and low in measurement accuracy in the prior art. The river discharge comprehensive measuring and calculating method comprises the following steps: setting up a water level master station, a representative flow velocity station and a water level auxiliary station, acquiring actually measured water level of a cross section, an elevation of the lowest point of a river bottom of the cross section, rate of rise and fall of the water level of the cross section, actually measured flow velocity of a water surface at a representative point as well as waterlevel difference of upper and lower gradient cross sections, substituting the acquired data into a river discharge comprehensive measuring and calculating model, and calculating and obtaining river cross-section discharge.

Description

technical field [0001] The invention relates to a method and system for comprehensive measurement and calculation of river flow, and belongs to the technical field of hydrological measurement. Background technique [0002] The cross-sectional flow of the river channel is the product of the cross-sectional area and the average flow velocity of the cross-section. Therefore, the flow measurement must measure the cross-sectional area and flow velocity separately. At present, my country's river flow measurement mainly includes current meter method and navigation ADCP measurement. When the current meter method is used for measurement, a lot of depth and speed measuring vertical lines are arranged on the section, and an appropriate number of speed measuring points are arranged on each vertical line to calculate the average flow velocity of the vertical line, and then calculate the partial flow velocity and partial area to obtain the partial The flow of each part is accumulated to ...

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Problems solved by technology

[0011] (3) Although the ADCP current meter has been used for a long time to measure flow, there are many factors affecting its measurement results, such as instrument error, wave influence, river noise, sediment influence, etc. The degree of certainty is about 18%, which can only meet the accuracy requirements of the three types of accuracy stations

[0012] (4) Some comparison tests are being carried out for side-scan radar water surface velocity measurement. Due to the difference in river flow environment, the comparison results are also very different. From the analysis of the existing measurement results and measurement principles, the measurement error of this method will be greater than The error of ADCP measurement results

[0013] (5) The cost of the fixed-point ADCP flow measuring station is about 350,000 yuan, and the price of the side-scan radar flow measuring station is about 700,000 yuan. For the Chinese hydrological industry that is not rich, the cost is quite expensive

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