Method for determining unstable-flow-velocity water flow duration of natural river channel

Abstract

The invention provides a method for determining unsteady flow velocity and water flow duration of a natural river channel. The method comprises the steps of obtaining a start-stop section without water in and out of the river channel; automatically acquiring the water level of the upstream preset position, the upstream sampling time corresponding to the water level and the upstream flow velocity multiple times in real time at the upstream preset position of the start-stop section; automatically acquiring the water level of the downstream preset position and the downstream sampling time corresponding to the water level multiple times in real time at the downstream preset position of the start-stop section; calculating the upstream and downstream sampling time difference when the upstream and downstream water level amplitudes are at the same height, constructing a mathematical relationship between the time difference and the upstream flow velocity, and determining the unstable flow velocity water flow duration of the natural river channel according to the mathematical relationship. The relations between the water mass flowing duration Ti and the flow velocity VAi are established whenthe upstream water level and the downstream water level vary at the same height, the unstable flow velocity water flow duration of the natural river channel is determined, a time determination methodis provided for analyzing the pollutants in the river at any time, and then the degradation condition of the pollutants in the river is accurately analyzed.

Description

technical field [0001] The embodiments of the present invention relate to urgently needed technical fields such as calculation of water environment capacity in unsteady flow of natural rivers, carrying capacity of water environment, restoration of water ecology, setting of sewage outlets, etc., and specifically relate to a method for determining duration of unsteady flow velocity in natural rivers. Background technique [0002] At present, there are many methods to study the comprehensive degradation coefficient of rivers, but under the unsteady flow rate of natural rivers, it is difficult to determine the time for water mass to go from the upper section to the lower section, which makes it difficult to grasp the sampling time, resulting in the inability to carry out the degradation experiment or the large deviation, or even obtain produce the opposite result. Whether it is water mass tracking or measuring the average flow velocity of a limited section to determine the time ...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many methods to study the comprehensive degradation coefficient of rivers, but under the unsteady flow rate of natural rivers, it is difficult to determine the time of water mass from the upper section to the lower section, which makes it difficult to grasp the sampling time, resulting in the inability to carry out the degradation experiment or the deviation is large, and even obtained the opposite result

Whether it is water mass tracking or measuring the average flow velocity of a limited section to determine the time from the initial section to the final section (ranging from about a few kilometers to tens of kilometers), it is difficult to accurately determine the water flow from the initial section to the final section. time

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