Evolution characteristics and attribution identification method of lake current in through-lake lake

Abstract

The application discloses a method for identifying lake flow evolution characteristics and attribution, comprising the following steps: obtaining a lake flow observation flow rate, a river-lake water level difference and an external driving factor sequence; constructing a river-lake hydraulic response model with a flow direction symbol function, separating an immediate response flow rate component generated by the water level difference instantaneous driving from the lake flow observation flow rate by using the model, and obtaining a lake flow residual sequence representing the change of the lake system itself; and constructing a multi-factor attribution model for the lake flow residual sequence based on the external driving factor, and quantitatively determining the contribution rate of each factor to the lake flow evolution. The application realizes the dynamic separation of the river-lake backwater effect and the evolution trajectory of the response coefficient by constructing a time-varying state space model, solves the problem that the traditional method confuses passive response and active evolution and cannot identify the drift of the river channel physical characteristics, and realizes the quantitative attribution of the lake flow evolution under complex hydraulic conditions.

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