River phase relation suitable for runoff tidal estuary area and derivation method thereof

Abstract

The invention discloses a river phase relation suitable for a runoff tidal estuary area and derivation method thereof. The method is characterized by comprising the following steps: S1, primarily deriving the river phase relation by combining the O'Brien method with the Douguoren method; S2, establishing a current mathematic model according to the actually measured data of the river, and solving the current mathematic model by use of a finite volume method; S3, selecting a river area only under the runoff effect, and fitting the river phase relation of the runoff river area; S4, selecting the engineering river area of the representative upstream runoff flow; S5, dividing the river area into a certain number of cross sections, equally dividing the river width of each cross section into several, and calculating through the river phase relation of the runoff river area fitted in the step S3; and S6, respectively calculating the average wetted area A and QT falling of the river area in the step S4 by use of the current mathematic model in the step S2. The river phase relation disclosed by the invention has extremely high precision when qualitatively and quantitatively describing the relation of a river power condition and the channel morphology at the runoff tidal estuary area.

Description

technical field [0001] The invention relates to a river phase relationship, in particular to a river phase relationship suitable for runoff and tidal estuary sections. Background technique [0002] The riverbed morphology of the runoff-tidal estuary is the result of the interaction of incoming water and sediment in the river basin, ocean tidal dynamics, etc. There is a certain relationship between them, which is usually called the river phase relationship. [0003] The research on river facies relationship aims to seek the quantitative relationship between riverbed geomorphology and dynamic factors. [0004] A large number of studies have been carried out at home and abroad on the relationship between rivers, especially the relationship between tidal volume or flow and the area of ​​the water, and the results are quite fruitful. In 1930, O'Brien proposed the expression between tidal volume and cross-sectional area (relative to the mean sea level) when investigating the tida...

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Problems solved by technology

[0005] The above studies mainly focus on the case of runoff or tidal current acting alone. Even some studies also involve ru

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