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Dynamic precipitation downscaling method considering local variables and global variables

A technology of global variables and local variables, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as unrealized downscaling, unconsidered actual physical meaning of precipitation, etc., to ensure objective rationality, data source Stable and reliable, the effect of improving the scope of application

Inactive Publication Date: 2018-10-19
HOHAI UNIV
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Problems solved by technology

Statistical downscaling methods mainly include: multiple linear regression, stepwise linear regression, principal component analysis, support vector machine, artificial neural network, etc. None of the above methods considers the actual physical meaning of precipitation and does not realize dynamic downscaling

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  • Dynamic precipitation downscaling method considering local variables and global variables
  • Dynamic precipitation downscaling method considering local variables and global variables
  • Dynamic precipitation downscaling method considering local variables and global variables

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] Such as figure 1 As shown, a kind of dynamic precipitation downscaling method considering local variable and global variable provided by the present invention comprises the following steps:

[0052] Step 1, extract the 25km and Rkm DEM raster data and mask files of the target watershed, specifically:

[0053] Step 11, fill the pit, calculate the flow direction, and calculate the confluence flow;

[0054]Step 12, determining the outlet point of the watershed and extracting the target watershed;

[0055] Step 2, use the DEM raster data of the watershed to calculate the slope, aspect, surface roughness, and distance to the coastline of the watershed, and extract the NDVI and wind speed of the watershed according to the mask, specifically:

[0056] Step 21, calculate the watershed slope, slope aspect, and surface roughness of 25km and Rkm...

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Abstract

The invention discloses a dynamic precipitation downscaling method considering local variables and global variables, comprising the following steps: 1, obtaining local variables and global variables of a watershed, wherein the local variables include DEM, slope, aspect, surface roughness and distance to a coastline, and the global variables include vegetation cover index and wind speed; 2, obtaining the original satellite precipitation data of the watershed; and 3, constructing a mixed geographically weighted regression model, establishing a relationship equation between the original satelliteprecipitation and the variables, estimating coefficients of Rkm by a weight function, and obtaining spatial precipitation of Rkm according to the estimated coefficients of Rkm. The invention considers both local variables and global variables, realizes the spatial downscaling of satellite precipitation, further obtains the spatial precipitation with high spatial-temporal resolution, and can moreaccurately reflect the spatial distribution of precipitation.

Description

technical field [0001] The invention belongs to the technical field of hydrology and meteorology, and in particular relates to a dynamic precipitation downscaling method considering local variables and global variables. Background technique [0002] In recent years, global warming has led to changes in precipitation and redistribution of time and space, which in turn has led to regional or basin floods, resulting in varying degrees of loss of life and property. Precipitation is not only the most important driving force of the global water cycle, but also the most important driving field of hydrological models. Obtaining spatially continuous precipitation products as the input of the distributed hydrological model is beneficial to improve the accuracy and reliability of the forecast. [0003] As a common research object in the fields of hydrology and meteorology, precipitation has always attracted the attention of academic circles and production units. Spatially continuous ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 晁丽君张珂
Owner HOHAI UNIV
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