Improving Hydrological Process Modeling Using Optimized Threshold-Based Wavelet De-Noising Technique

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• 作者：Peyman Abbaszadeh
• 关键词：Precipitation process ; Wavelet neural network ; Wavelet De ; noising technique
• 刊名：Water Resources Management
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：30
• 期：5
• 页码：1701-1721
• 全文大小：2,609 KB
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• 作者单位：Peyman Abbaszadeh (1)
  
  1. Remote Sensing and Water Resources Lab, Department of Civil and Environmental Engineering, Portland State University, Portland, OR, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geotechnical Engineering
  Meteorology and Climatology
  Civil Engineering
  Environment
  
• 出版者：Springer Netherlands
• ISSN：1573-1650

文摘

The extent of the noise on hydrological data is inevitable, which reduces the efficiency of Data-Driven Models (DDMs). Despite of this fact that the DDMs such as Artificial Neural Network (ANN) are capable of nonlinear functional mapping between a set of input and output variables, but refining of the time series through data pre-processing methods can provide with the possibility to increase the performance of these set of models. The main objective of this study is to propose a new method called Optimized Threshold-Based Wavelet De-noising technique (OTWD) to de-noise hydrological time series and improve the prediction accuracy while the DDM is being used. For this purpose, in the first step, Wavelet-ANN (WNN) model was developed for identifying suitable wavelet function and maximum decomposition level. Afterward, sub-signals of original precipitation time series which were determined in the first step were de-noised by using of OTWD technique. Therefore, these clean sub-signals of precipitation time series were imposed as input data to the ANN to predict the precipitation one time step ahead. The results showed that OTWD technique could improve the efficiency of WNN model dramatically; this outcome was reported by the different efficiency criterions such as Nash-Sutcliffe Efficiency (NSE = 0.92), Root Mean Squared Error (RMSE = 0.0103), coefficient correlation of linear regression (R = 0.93), Peak Value Criterion (PVC = 0.021) and Low Value Criterion (LVC = 0.026). The best fitted WNN model in comparison by proposed model showed weaker performance by the NSE, RMSE, R, PVC and LVC values of 0.86, 0.043, 0.87, 0.034 and 0.045, respectively.