Method for determining arrival of tidal bore based on water velocity

A technology of flow velocity and water flow, applied in the field of automation, can solve problems such as equipment loss, audio characteristics are not obvious enough, not suitable for night or river surface is foggy, etc., to achieve the effect of increasing accuracy and rigorous judgment

CN103090855BInactive Publication Date: 2014-12-17HANGZHOU DIANZI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-12-17
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0029] The method of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1As shown, analyzing the flow velocity when the tidal surge arrives in many experiments, it can be known that the most obvious feature is that when the tidal surge arrives, the flow velocity suddenly increases instantaneously, then decreases after a period of time, and remains constant for a long time after decreasing to a certain extent. Smaller stable flow rate (this value is greater than the value of the flow rate before arrival, so as to eliminate the misjudgment caused by interference, because if the flow rate changes due to interference, the flow rate will return to the original flow rate after the interference disappears). The present invention judges whether tidal surge arrives by this feature. That is, the flow velocity data during the arrival of the tide is divided into four states: 1. The tide has not yet arrived, 2. The ...