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Hydropower station basin key point-based water inflow early warning method and system

A key point and daily water inflow technology, applied in the field of early warning of water inflow in hydropower station basins, can solve problems such as large estimation errors, and achieve high practicability, clear physical meaning, and accurate and effective monitoring data

Pending Publication Date: 2021-04-20
GUIZHOU QIANYUAN POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, parameters such as evaporation, soil moisture, loss coefficient, and runoff coefficient were often introduced to characterize, and various methods such as empirical coefficients, mathematical statistics, and water storage capacity curves were used. However, the ability of the underlying surface to absorb precipitation is dynamic and multi-factorial. , resulting in a large error in the estimation of the above method
Moreover, hydrological models require long training for localization before they can be used

Method used

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  • Hydropower station basin key point-based water inflow early warning method and system
  • Hydropower station basin key point-based water inflow early warning method and system
  • Hydropower station basin key point-based water inflow early warning method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Construction of early warning indicators: Taking the middle interval of a cascade power station in western Guizhou as an example.

[0123] (1) Process screening:

[0124] Determine the interval watershed surface, such as image 3 As shown, the calculated basin area is 1945km 2 ;

[0125] Obtain the daily inflow series and the daily rainfall data of all rainfall measuring stations in the interval basin from 2017 to 2019 at 08-08, calculate the daily measured rainfall according to the daily rainfall data, and filter out the daily measured rainfall from the daily measured rainfall data The data of rainfall ≧ 10mm, a total of 97 research processes were obtained.

[0126] (2) Key point screening:

[0127] Extract the data of all meteorological and rainfall measuring stations in the basin area, including 47 meteorological stations and 6 self-built stations of hydropower stations, and mark them according to latitude and longitude information, such as image 3 shown;

[0...

Embodiment 2

[0145] Application Note: Taking the result of Example 1 as an example

[0146] (1) Application scenario: For the inflow of natural water in the interval watershed, it is applied to the 0-24 hour early warning of the interval watershed, regardless of the upstream water.

[0147] For the middle section of the watershed of this cascade power station, if the upstream water needs to be considered, the actual rainfall R of the watershed in the interval r Early warning indicators are not available, because upstream water flow is artificially regulated and unpredictable.

[0148] The warning start time and warning period need to be set.

[0149] (2) Assume that the current time is 10 am in Beijing, the actual rainfall in the past hour is 10mm, and the warning period is set from 9:00 to 11:00 in Beijing, and the actual rainfall at 10:00 and 11:00 is read as 12mm and 2mm, Then the actual rainfall R in the early warning period r is the hourly accumulation of rainfall during the early ...

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Abstract

The invention discloses a hydropower station basin key point-based water inflow early warning method and system. The method comprises steps of the actual rainfall, the meteorological drought index and the cumulative effective rainfall of the first ten days in the interval watershed early warning period being acquired; inputting the meteorological drought index and the accumulated effective rainfall of the first 10 days into a pre-established runoff production coefficient calculation model to obtain a runoff production coefficient of an early warning period; and according to the runoff production coefficient and the actual rainfall of the early warning period, combining a pre-constructed interval inflow early warning index system to determine an early warning level. According to the method, the short-period early warning requirement of the prediction period within one day is met according to the predicted water inflow, the established mathematical model is simple, physical meaning is clear, and practicability is very high; the characteristics of complex terrain or mountainous rainfall are considered, key point screening is performed on the actually measured rainfall, so monitoring data is accurate and effective, the operand is reduced, and practicability and the fitting effect of the model are improved.

Description

technical field [0001] The invention relates to a water inflow early warning method and system based on key points of a hydropower station basin, and belongs to the field of water inflow early warning in a hydropower station basin. Background technique [0002] There is a close relationship between the change of inflow to cascade hydropower stations and precipitation. Rainfall of a certain magnitude and intensity is the main factor for runoff production. At the same time, the underlying surface and human activities also have a certain impact on inflow. When heavy rainfall occurs in a certain period of time in the basin, the basin often has a significant increase in inflow, and even floods. For hydropower stations, early warning of floods with a short expected period of one day in the watershed is very critical, and it is the key to reporting plans and production scheduling. Among them, the size of the surface rainfall in the basin and the loss of precipitation, or runoff co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/06G06F17/11
Inventor 孔祥波唐延婧肖鹏雷坤江醋院科李泽宏廖波王加敏宋万礼夏晓玲汤永娟
Owner GUIZHOU QIANYUAN POWER CO LTD
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