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Wavelet-Exponential Smoothing: a New Hybrid Method for Suspended Sediment Load Modeling

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Abstract

In this study, four conventional and a newly proposed method of wavelet-exponential smoothing (WES) - with two presented scenarios (WES1 and WES2) – are employed to estimate daily and monthly suspended sediment load (SSL) in two rivers (Lighvanchai river in Iran and Upper Rio Grande in the USA), which have different hydro-geomorphological characteristics of the related watersheds. In the proposed WES method, first, wavelet transform (WT) is applied to the original observed time series to decompose them into approximation and detailed subseries to separate different components of time series. For the first scenario (WES1), only two time series, i.e., an approximation and a detail time series are utilized as inputs of model, whereas for the second scenario (WES2), all subseries are separately fed into different exponential smoothing (ES) models. The results revealed that for both rivers, the proposed WES2 and wavelet based artificial neural network (WANN) models could lead to superior performance in comparison to the autoregressive integrated moving average (ARIMA), seasonal ARIMA (SARIMA), ES ad-hoc and artificial neural network (ANN). The WES2 method could enhance the overall performance of SSL forecasting both in daily and monthly modeling of the case studies regarding Nash-Sutcliffe (E) efficiency criteria, respectively up to 13%, 42% and 87%, 116% in daily and monthly scales for SSL modeling of the Lighvanchai and Upper Rio Grande Rivers. As a result, combining WT with ES method and ANN led to more accurate modeling.

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Abbreviations

ACF:

Auto Correlation Function

AI:

Artificial Intelligence

AIC:

Akaike Information Criterion

ANN:

Artificial Neural Network

ARIMA:

Auto Regressive Integrated Moving Average

CC:

Correlation Coefficient

db4:

Daubechies order 4 wavelet

DEM:

Digital Elevation Model

DLMs:

Deep Learning Models

E:

Nash-Sutcliffe

EP:

Nash-Sutcliffe for peak values

ELM:

Extreme Learning Machine

ES:

Exponential Smoothing

FFBP:

Feed Forward Back Propagation

HW:

Holt-Winters

IWPC:

Iran Water & Power Resources Development Co

LSSVM:

Least Squares Support Vector Machine

MARE:

Mean Absolute Relative Error

MI:

Mutual Information

MSRE:

Mean Squared Relative Error

RMSE:

Root Mean Square Error

RF:

Random Forest

SARIMA:

Seasonal Auto Regressive Integrated Moving Average

SSL:

Suspended Sediment Load

SVM:

Support Vector Machine

USGS:

United States Geological Survey

WANN:

Wavelet–artificial neural network

WES:

Wavelet-Exponential Smoothing

WT:

Wavelet Transform

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Correspondence to Elnaz Sharghi.

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Sharghi, E., Nourani, V., Najafi, H. et al. Wavelet-Exponential Smoothing: a New Hybrid Method for Suspended Sediment Load Modeling. Environ. Process. 6, 191–218 (2019). https://doi.org/10.1007/s40710-019-00363-0

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  • DOI: https://doi.org/10.1007/s40710-019-00363-0

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