Paper Information

Journal:   WATERSHED ENGINEERING AND MANAGEMENT   2019 , Volume 10 , Number 4 #g00632; Page(s) 635 To 644.
 
Paper: 

Modeling and routing of surface evaporation from the Amir Kabir reservoir using the Mann-Kendall and neural network technology

 
 
Author(s):  Jahangir Mohammadhossein*, SOLTANI KEYVAN, NOHEGAR AHMAD, SADATINEJAD SEYED JAVAD
 
* Faculty of New Sciences and Technologies, University of Tehran, Iran
 
Abstract: 
Evaporation as a natural parameter due to the release of water from the upper part of mankind has always been of interest to scholars and researchers. In this study, we try to apply the artificial neural network model to estimate evaporation from the Amir Kabir dam and to evaluate the model accuracy. In this context, 18 years data from 1997 to 2014 were used and after consecutive try and error, the best structure for computing the amount of evaporation from the surface of the dam was selected. This structure has five neurons in the first, fourth and second layers that showed the best result in 1000 replications. Also, statistical coefficients obtained from the analysis using artificial neural network was considered in choosing the best structure with the amount of 0. 9365 which was the highest amount among other tests and the amount of test and training data error were 0. 0321 and 0. 0311, respectively. In addition, general trend of effective data on evaporation was determined, using Mann-Kendall test on 15 years daily data. In Mann-Kendall method, temperature changes, wind speed and precipitation graphs had no significand trend and showed-1. 69< U <1. 69. Water level among 2000 to 2014 U has exceeded from 1. 69 that shows the rising trend in this period and has decreased again after all these years. In the trend of evaporation monthly changes between 2000 and 2014 U has exceeded out of-1. 69 that shows sovereignty of negative trend in this period.
 
Keyword(s): Correlation coefficient,Neuron,Model accuracy,Test and training data,Try and error
 
References: 
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