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Hydrological model efficiency coefficient calculation method based on weighted least absolute deviation method

A technology of efficiency coefficient and hydrological model, applied in calculation, probabilistic CAD, electrical and digital data processing, etc., it can solve the problem that Nash efficiency coefficient does not consider heteroscedasticity, does not meet the last two axioms of metric operator, etc., to deepen understanding and cognitive effects

Inactive Publication Date: 2017-06-27
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Problems solved by technology

[0015] Aiming at the deficiencies of the prior art, the present invention aims at the difficult problem that the Nash efficiency coefficient does not consider the heteroskedasticity and does not satisfy the last two axioms of the measurement operator, and proposes a method for calculating the efficiency coefficient of the hydrological model based on the weighted least one multiplication method

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  • Hydrological model efficiency coefficient calculation method based on weighted least absolute deviation method
  • Hydrological model efficiency coefficient calculation method based on weighted least absolute deviation method
  • Hydrological model efficiency coefficient calculation method based on weighted least absolute deviation method

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Embodiment Construction

[0034] The technical solution of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

[0035] as attached figure 1 As shown, a hydrological model efficiency coefficient calculation method based on the weighted least one multiplication method includes the following steps:

[0036] Step 1, data preparation. The observed runoff sequence is compiled from the data of the hydrological station; after determining the study area, the model used and the parameter values, the simulated runoff sequence is obtained by running the model. The parameter values ​​are generally sample points obtained by using random sampling algorithms such as Monte Carlo in the parameter space;

[0037] Step 2, calculate the average runoff sequence, that is, the arithmetic mean of the observed runoff sequence and the simulated runoff sequence;

[0038] Step 3, take the reciprocal of the average runoff as the weight of...

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Abstract

The invention discloses a hydrological model efficiency coefficient calculation method based on a weighted least absolute deviation method. The method comprises the following steps of 1, obtaining a observing and simulating runoff sequence; 2, calculating arithmetic mean of the observing and simulating runoff sequence and obtaining average runoff; 3, using the reciprocal of an average flow rate as the weight of the weighted least absolute deviation method; 4, obtaining an efficiency coefficient by a calculation method that 1 minus weighting of an observing and simulation value residual absolute value sequence and divide the sequence length. According to the hydrological model efficiency coefficient calculation method based on the weighted least absolute deviation method, by quantitatively considering heteroscedasticity which widely exists in hydrological simulation, the weighted least absolute deviation method is combined, and the problem that a Nash efficiency coefficient is oversensitive to a peak value is corrected. The method has the advantages of boundedness, time domain independence, robustness and the like and is easily promoted to other model assessment studies.

Description

technical field [0001] The invention relates to the technical field of calculating the model efficiency coefficient of a hydrological model, in particular to a method for calculating the efficiency coefficient of a hydrological model based on a weighted least one multiplication method. Background technique [0002] Hydrological model is currently the main tool for studying the water cycle process in a watershed. In the application of the model, it is generally necessary to evaluate the pros and cons of the simulation effect by calculating a certain (some) efficiency coefficient, so as to obtain the best parameter combination with the help of the optimization algorithm. The most widely used efficiency coefficient is the Nash-Sutcliffe efficiency coefficient [1] (hereinafter referred to as Nash efficiency coefficient), its calculation method is as follows: [0003] [0004] Among them, NSE represents the Nash efficiency coefficient; N is the sequence length; qobs is the o...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/08
Inventor 占车生韩建
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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