Method for determining arrival of tidal bore based on water velocity

Abstract

The invention discloses a method for determining the arrival of tidal bore based on water velocity. The method specifically comprises the following steps of: correctly mounting a radar wave flow velocity meter on the surface of a river; collecting the flow velocity data; determining whether or not to switch the flow velocity data from state 1 to state 2 according to whether the flow velocity increases; determining whether or not to switch the flow velocity data from state 2 to state 3 according to whether the flow velocity decreases; determining whether or not to switch the flow velocity data from state 3 to state 4 according to whether the flow velocity is stable; determining that whether the reason causing the flow velocity change is interference or arrival of the tidal bore according to the difference between the stabilized flow velocity after changing and the flow velocity before changing; and determining the level of the tidal bore according to the magnitude of the difference between the maximal flow velocity in the change process and the flow velocity before changing. The method provided by the invention not only can determine the arrival of a tidal bore, but also can determine the flow velocity of the tidal bore, thereby providing necessary data for forecasting the arrival time of the tidal bore to the next station, and comprehensively realizing real-time automatic tidal bore detection and warning of rivers.

Description

technical field [0001] The invention belongs to the technical field of automation, and specifically relates to a method for judging whether a tidal surge has arrived based on the velocity of water flow, which can be used for monitoring and real-time forecasting and early warning of tidal surges in rivers. Background technique [0002] The Qiantang River flows into the East China Sea in the Hangzhou Bay. The estuary is wide on the outside and narrow on the inside. The wide part reaches 100 kilometers, and the narrow part is only a few kilometers. As soon as the seawater enters the estuary, the water surface is wide, and the further inward it is, the more it is restricted by the terrain on both sides of the river. The seawater has to accumulate and accumulate higher and higher. In addition, the flow of the Qiantang River is blocked, which promotes the rise of the water level, like an upright river. wall of water. When the seawater from the back keeps pouring in, a spectacular...

AI Technical Summary

Problems solved by technology

For contact detection, on the one hand, equipment loss will be caused by seawater corrosion; on the other hand, for a large tidal river like the Qiantang River, the impact of the tide makes the installation requirements of the equipment very high

Therefore, non-contact detection is generally used at present, but the existing technologies still have their own limitations in application.

For example, for the river tide detection method based on audio feature recognition, when the tide is small, the audio features are not obvious enough to achieve the purpose of identifying tide

However, the river tide detection method based on video recognition is not suitable for conditions such as night or fog on the river.

In addition, the existing technology is only limited to judging whether the tide has arrived, but cannot judge the level of the tide, which is not conducive to predicting the time when the tide will arrive at the next station, making the real-time automatic detection and early warning of the river tide not comprehensive enough

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