Analysis of suspended sediment load data in rivers is the basis for understanding the trend of erosion and sediment in the management and planning of soil and water resources. Due to lack of access to daily suspended sediment loading data with direct measurement, it is important to use methods for modeling and estimating it in watersheds. One of the best methods used in this field is the use of artificial neural networks. To evaluate daily suspended sediment load, Sira hydrometric station was studied in Karaj River watershed. The number of data used in this study included 624 information records of 31 years (1981–2011) statistical period .Input data to the artificial neural network models included instantaneous flow discharge, average daily flow discharge, average daily flow discharge with a delay of three days, average daily precipitation and average daily precipitation with a delay of three days. Output data to models was daily suspended sediment load. In this research, gamma test and genetic algorithm were used to obtain optimal variables and best combination of variables for entering the model. Then, these combinations with some combination of test and error variables were entered to artificial neural network models. The self-organizing map neural network was used for data clustering and all data were divided into three homogeneous groups: 70 percentage training data, 15 percentage validation data and 15 percentage test data. Then, the combination of variables entered to neural network models with activation functions log sigmoid and tangent sigmoid. The results showed that the neural networks using the optimal variable combinations in comparison with manual combinations have a more accurate estimate for suspended sediment load. In all combinations of inputs to neural network models, a model with tangent sigmoid activation function, with input variables combination including, instantaneous flow discharge (Q), average daily flow discharge (Qi), average daily flow discharge for two day ago (Qi-2), average daily flow discharge for three day ago (Qi-3), average daily precipitation (Pi), average daily precipitation for two day ago (Pi-2) and average daily precipitation for three day ago (Pi-3), was the best model for estimating daily suspended sediment load. This model has the lowest of error (MAE=500.05 (ton/day), RMSE=1995.33(ton/day) and Erel=7%), the highest accuracy (R2=0.96), the highest performance model (NSE=0.96) and has the lowest general standard deviation (GSD=0.97) compared to other models. Also, this model is the best combination with the most influential input variables derived from gamma test and genetic algorithm for estimating SSL. |
- Abbaspour, B. and A.H. Haghiabi. 2015. Comparing the estimation of suspended load using two methods of sediments rating curve and artificial neural network, a case study: Cham Anjir Station, Lorestan Province. Journal of Environmental Treatment Techniques, 3(4): 215-222.
- Azamathulla, H.M., Y.C. Cuan, A.A. Ghani and C.K. Chang. 2013. Suspended sediment load prediction of river systems: GEP approach. Arabian Journal of Geosciences, 6(9): 3469-3480.
- Bolboaca, S.D. and L. Jantschi. 2006. Pearson versus Spearman, Kendall's tau correlation analysis on structure-activity relationships of biologic active compounds. Leonardo Journal of Sciences, 5(9): 179-200.
- Boukhrissa Z.A., K. Khanchoul, Y. Le Bissonnais and M. Tourki. 2013. Prediction of sediment load by sediment rating curve and neural network (ANN) in El Kebir Catchment, Algeria. Journal of Earth System Science, 122(5): 1303–1312.
- Bowden, G.J., H.R. Maier and G.C. Dandy. Optimal division of data for neural network models in water resources applications. Water Resources Research, 38(2): 1-12.
- Chaudhary, V., R.S. Bhatia and A. Ahlawat. 2014. The selforganizing map learning algorithm with inactive and relative winning frequency of active neurons. Journal HKIE Transactions, 21(1): 62–67.
- Chen, X.Y. and K.W. Chau. 2016. A hybrid double feed forward neural network for suspended sediment load estimation. Water Resources Management, 30: 2179–2194.
- Durrant, P.J. 2001. WinGamma: a non-linear data analysis and modelling tool with applications to flood prediction. PhD Thesis, Department of Computer Science, Cardiff University, Wales, UK, 265 pages.
- Evans, D. and A.J. Jones. 2002. A proof of the gamma test. Proceedings of the Royal Society of London Series, 458: 2759–2799.
10. Gan, G., M. Chaoqun and W. Jianhong. 2007. Density-based clustering algorithms, in data clustering: theory, algorithms and applications. Society for Industrial and Applied Mathematics, 20: 219-226.
11. He, Z., X. Wen, H. Liu and J. Du. 2014. A comparative study of artificial neural network, adaptive euro fuzzy inference system and support vector machine for forecasting river flow in the semiarid mountain region. Journal of Hydrology, 509(4): 379–386.
- Jones, A.J. 2004. New tools in non-linear modeling and prediction. Computational Management Science, 1: 109-149.
- Joshi, R., K. Kumar and V. Pal Singh Adhikari. 2016. Modelling suspended sediment concentration using artificial neural networks for Gangotri glacier. Hydrological Processes, 30: 1354-1366.
- Kakaei Lafdani, E., A. Moghaddam Nia and A. Ahmadi. 2013. Daily suspended sediment load prediction using artificial neural networks and support vector machines. Journal of Hydrology, 478(4): 25-50.
- Kaufman, L. and P.J. Rousseeuw. 2009. Finding groups in data: an introduction to cluster analysis. Hoboken, New Jersey, John Wiley and Sons, 342 pages.
- Kişi, O. 2012. Modeling discharge-suspended sediment relationship using least square support vector machine. Journal of Hydrology, 456(5): 110–120.
- Kisi, O. and C. Ozkan. 2017. A new approach for modeling sediment-discharge relationship: local weighted linear regression. Water Resources Management, 30(2): 1-23.
- Kisi, O. and J. Shiri. 2012. River suspended sediment estimation by climatic variables implication: comparative study among soft computing techniques. Computers and Geosciences, 43(2): 73–82.
- Kohonen, T. 2013. Essentials of the self-organizing map. Neural Networks, 37: 52–65.
- Moghaddamnia, A., M. Ghafari Gousheh, J. Piri, S. Amin and D. Han. 2009. Evaporation estimation using artificial neural networks and adaptive neurofuzzy inference system techniques. Advance Water Resources, 32: 88-97.
- Remesan, R., M.A. Shamim, D. Han and J. Mathew. 2009. Runoff prediction using an integrated hybrid modelling scheme. Journal of Hydrology, 372: 48–60.
- Shamim, M.A., M. Hassan, S. Ahmad and M. Zeeshan. 2016. A comparison of Artificial Neural Networks (ANN) and Local Linear Regression (LLR) techniques for predicting monthly reservoir levels. KSCE Journal of Civil Engineering, 20(2): 971–977.
- Shieh, S.L. and I. Liao. 2012. A new approach for data clustering and visualization using self-organizing maps. Expert Systems with Applications, 39: 11924–11933.
- Tayfur, G. 2012. Soft computing in water resources engineering, artifical neural networks, fuzzy logic and genetic algorithms. WIT Press, Southampton, England, UK, 267 pages.
- Tokar, A. and P. Johnson. 1999. Rainfall-runoff modeling using artificial neural networks. Journal of Hydrologic Engineering, 4(3): 232–239.
- Tfwala, S.S. and Y.M. Wang. 2016. Estimating sediment discharge using sediment rating curves and artificial neural networks in the Shiwen River, Taiwan. Water, 8(53): 1-15.
- Ulke, A., G. Tayfur and S. Ozku. 2009. Predicting suspended sediment loads and missing data for Gediz River, Turkey. Journal of Hydrologic Engineering, 14(9): 954-965.
- White, S.M. 2004. Sediment supply and transfer. In: Neural Networks for Hydrological Modeling. Published June 15th 2012 by Taylor and Francis, 316
- Wolfs, V. and P. Willems. 2014. Development of discharge-stage curves affected by hysteresis using time varying models, model trees and neural networks. Environmental Modeling and Software, 55(4): 107-119.
- Zhu, Y.M., X.X. Lua and Y. Zhoub. 2007. Suspended sediment flux modeling with artificial neural network: an example of the Longchuanjiang River in the Upper Yangtze Catchment, China. Geomorphology, 84(2): 111–125.
- Zounemat-Kermani, M., O. Kişi, J. Adamowski and A. Ramezani-Charmahineh. 2016. Evaluation of data driven models for river suspended sediment concentration modeling. Journal of Hydrology, 16(2): 1-40.
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