Tidal river network tide level forecasting method based on hydrodynamic force numerical simulation

Abstract

The invention provides a method for forecasting the tide level in a tidal river network and belongs to the technical field of hydrodynamic force simulation and hydrologic forecasting. A computational fluid dynamics (CFD) method and a water level forecasting method are comprehensively applied, the problem that the water level in the tidal river network is difficult to accurately forecast due to multi-branch stream bypass flowing and open sea tide influences is solved, and the application range and precision of tidal river network tide level forecasting are improved. The method mainly comprises the following steps that firstly, a tidal river network region and upstream riverway one-dimensional hydrodynamic force mathematical model is established; secondly, the hourly tide level processes of a control station of a river mouth are precast through harmonic analysis, and forecast values are corrected through measured data of the day before forecasting; thirdly, flow processes of control stations of an upstream are derived through a weighted moving average method; fourthly, tide level processes of all fracture surfaces in a tidal river network region are solved through the tidal river network region and upstream main stream area one-dimensional hydrodynamic force mathematical model, and the tide level forecasting of any fracture surface in the river network region is achieved.

Description

technical field [0001] The invention relates to the technical field of hydrodynamic simulation and hydrological forecast, in particular to a method for forecasting the tide level of a tidal river network based on hydrodynamic numerical simulation. Background technique [0002] With the continuous development of economic construction in estuaries and deltas, higher requirements are put forward for hydrological forecasting. How to quickly and accurately forecast tide levels has become an urgent problem to be solved. Flood control decision-making, water conservancy project design reference, gate pump group opening and closing scheme optimization, etc. have increasing demand for tide level forecasting in tidal network river areas. The water level change process of the tidal river network is affected by many factors such as upstream runoff, downstream tide, river branch diversion, interval inflow and precipitation. Changes, and some characteristics of the ocean, showing changes ...

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Problems solved by technology

[0003] Traditional tide level forecasts are mostly high water level forecasts, and the corresponding water level method is generally used, that is, the water level of a station and the transmission distance are used to calculate the water level of another station. The method separates the water level of the forecasting station into two parts related to the upstream and downstream water levels for forecasting respectively. Problems of convergence, accuracy when the amplitude is small, and large error in high water level forecasting

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