Grid rainfall calculation method based on observation station
A calculation method and grid technology, applied in complex mathematical operations, design optimization/simulation, instruments, etc., can solve problems such as low interpolation accuracy, dependence on hardware facilities, hysteresis, etc., to improve accuracy, avoid dependence on hardware facilities, good effect
Pending Publication Date: 2022-07-29
HOHAI UNIV
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Problems solved by technology
Traditional spatial interpolation methods include: such as inverse distance weighting method, kriging method, etc., which have a simple structure and are convenient for calculation, but they ignore the complex temporal and spatial characteristics of nonlinear rainfall data, resulting in low interpolation accuracy. This method performs spatial interpolation
Meteorological departments at home and abroad mainly use satellite radar multi-source fusion products, such as TMPA in the United States and GsMAP in Japan. They use a variety of data sources, including ground station data and satellite radar maps, etc., with high accuracy, but they rely too much on hardware facilities. , has a certain hysteresis and cannot effectively respond to sudden extreme rainfall
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[0048] The technical solutions of the present invention are described in detail below, but the protection scope of the present invention is not limited to the embodiments.
[0049] like figure 1 As shown, a grid rainfall calculation method based on a station in this embodiment includes the following steps:
[0050] Step S1 , establish a 1km×1km regular grid in the Tunxi watershed, so as to extract the multiple spatial features of the grid in the target watershed and perform rainfall mining on it.
[0051] When establishing a regular grid, the grid establishment range should be slightly larger than the area of the experimental watershed, covering all ground rainfall points in the experimental watershed, and the discrete measurement sites should be distributed in different grids as much as possible. The properties of the regular grid in the Tunxi watershed are shown in Table 1. , the grids are distributed in the Tunxi watershed as figure 2 .
[0052] Table 1
[0053] ...
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The invention discloses a grid rainfall calculation method based on an observation station, and aims to provide a method for obtaining more accurate spatial rainfall distribution. Aiming at emergency disposal of natural disasters caused by extreme rainfall, the effective method is to quickly and accurately acquire the spatial rainfall distribution condition with smaller granularity in a drainage basin and take targeted prevention measures. The grid rainfall calculation method comprises the following steps: carrying out feature extraction on grid meteorological discrete data; carrying out normalization processing on the structured data of the ground rainfall observation station; constructing a multi-spatial feature topological graph; establishing a regularized grid; and constructing a grid rainfall mining model on the basis of the data, and obtaining the grid rainfall distribution condition in the medium and small drainage basins. According to the method, a multi-spatial feature topological relation is constructed based on rainfall observation station data and grid meteorological data, the multi-spatial feature topological relation is used as an adjacent matrix of a graph convolutional neural network (GCN), a grid rainfall mining model MS-GCN based on the multi-spatial features is constructed, and the grid rainfall distribution condition of the small and medium-sized watershed can be more accurately obtained.
Description
technical field [0001] The invention belongs to the technical field of spatial rainfall mining, and in particular relates to a grid rainfall calculation method based on a station. Background technique [0002] Precipitation is an important feature of meteorological changes and the main source of surface runoff. Its unstable and uneven spatial and temporal distribution is the main cause of flood disasters and landslides. There are many small and medium-sized rivers in my country. How to respond quickly and effectively to the flood disaster caused by extreme rainfall has become an urgent problem to be solved. For the emergency response to natural disasters caused by extreme rainfall, an effective method is to quickly and accurately obtain the spatial distribution of rainfall with a small particle size in the basin, and take targeted preventive measures. However, the rainfall distribution in the middle and lower watersheds has the characteristics of nonlinearity, high complexi...
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IPC IPC(8): G06F30/27G06F17/16G06F119/02
CPCG06F30/27G06F17/16G06F2119/02
Inventor 王坤万定生余宇峰
Owner HOHAI UNIV