Estimation of evaporation from Dez regulatory dam station pan using artificial neural network

Subject Areas : watere sciences

mehdi  najafvand derikvandi ¹ (student of shoushtar branch)
hossein  eslami ² (water engineering department, water science faculty, Islamic azad university, shoushtar branch, shoushtar)

Received: 2017-06-08 Accepted : 2017-06-20 Published : 2016-03-20

Keywords: Artificial Neural Network, Evaporation pan, average temperature, T test, Dez regulating dam,

Abstract :

More rainfall in arid and semi-arid just evaporate into the atmosphere and so estimates the amount of water vapor in the water cycle will be important. Evaporation is dependent on various parameters and to its estimate needs for a different climate variables and the interaction of these variables is very complex, so it must be accurate methods to be used in the evaporation study. In this study, artificial neural networks were used to estimate the pan evaporation of Dez regulating dam station. As ANN hyperbolic tangent function and the learning momentum was used. Multilayer Perceptron structure which used a network of six input neurons, three hidden layer and an output neuron was formed. Input layers include maximum temperature, minimum temperature, sunshine hours, average wind speed, relative humidity and an average rate of evaporation from water surface to the output layer. The relationship between climatic factors showed that the average temperature on the surface evaporation caused more than sunshine and wind speed. High coefficient of determination (92/0) between the actual data with simulated data with artificial neural network plus a small error (RMSE = 1.41) showed that the estimate accuracy is very high. Verification by t-test revealed no significant (P> 0.01) differences were between actual and estimated values.