Tidal river network tide level forecasting method based on hydrodynamic force numerical simulation
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A numerical simulation and hydrodynamic technology, applied in CAD numerical modeling, electrical digital data processing, special data processing applications, etc., can solve problems such as difficult convergence, limited forecast time, and inability to meet long-term and medium-term forecast requirements.
Active Publication Date: 2016-11-30
PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION
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[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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[0067] See figure 1 , figure 1 It is a flowchart of a method for forecasting the tide level of a tidal river network based on hydrodynamic numerical simulation disclosed in this embodiment. figure 1 A tidal river network tide level prediction method based on hydrodynamic numerical simulation is shown, which specifically includes the following steps:
[0068] Step S1, select an appropriate research area according to the forecast position, and determine the lower boundary of the estuary and the upper control station and boundary;
[0069] Step S2, performing section division and terrain interpolation on the channel within the research area;
[0070] Step S3, establishing a one-dimensional unsteady flow hydrodynamic mathematical model of the network river area between the upstream control station and the downstream estuary boundary; the specific steps are as follows:
[0071] Step S31, the mathematical model of the one-dimensional power flow adopts Saint-Venant's equations, an...
Embodiment 2
[0108] The present invention will be further described in detail with the example of tide level prediction of the outer river in the Shundawei dispatching system in the Pearl River Delta river network and the accompanying drawings.
[0109] (1) According to the location characteristics of Zhongshun Dawei, determine the research scope of the tide level forecasting model—including the West, Beijiang Delta, Dongjiang Delta, Guangzhou Outlet Channel, and Tanjiang Channel; the upper boundary is taken from the following control hydrological (level) stations: Xijiang Wuzhou, Beijiang Shijiao, Laoyagang (Liuxi River), Qilinzui (Zengjiang), Dongjiang Boluo, Tanjiang Shizui Station; the lower boundary is taken to the eight gate control stations: Dahu, Nansha, Fengmamiao, Heng Menmen and Modaomen Lantern Hill, Huangjin, Xipaotai, Guanchong, see Figure 3(a) and Figure 3(b);
[0110] (2) Carry out section division and topographic interpolation on the channel, with a total of 4140 sections,...
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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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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367G06F2111/10
Inventor 杨莉玲胡晓张杨芳杨志伟余顺超刘壮添
Owner PEARL RIVER HYDRAULIC RES INST OF PEARL RIVER WATER RESOURCES COMMISSION
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