COMPARISON OF SOME METHODS FOR ESTIMATION OF DAILY PAN EVAPORATION: CASE STUDY IN KERMAN REGION

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SHADMANI M.; MAROFI S.

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Journal: Journal of Water and Soil Science Year:2011 | Volume:15 | Issue:55 Page(s): 69-83

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Title

COMPARISON OF SOME METHODS FOR ESTIMATION OF DAILY PAN EVAPORATION: CASE STUDY IN KERMAN REGION

Author(s)

SHADMANI M. | MAROFI S. | Issue Writer Certificate

Keywords

EVAPORATION ESTIMATIONQ2

NEURO-FUZZYQ2

ARTIFICIAL NEURAL NETWORKQ2

NON-LINEAR REGRESSIONQ1

STEPHENS-STEWART METHODQ2

Abstract

In this research, based on the observed data of Class A pan evaporation and application of NON-LINEAR REGRESSION (NLR), ARTIFICIAL NEURAL NETWORK (ANN), NEURO-FUZZY (NF) as well as Stephens-Stewart (SS) methods daily evaporation of Kerman region was evaluated. In the cases of NLR, ANN and NF methods, the input variables were air temperature (T), air pressure, relative humidity (RH), solar radiation (SR) and wind speed (U2) which were used in various combinations to estimate daily pan evaporation (Ep) defined as output variable. Performance of the methods was evaluated by comparing the observed and estimated data, using determination coefficient (R2), root mean square error (RMSE) and mean absolute error (MAE). Based on the observed data at Kerman meteorological station, the monthly and annual average evaporation values of the region were 272 and 3263 mm, respectively. The results of this study indicated that NF method is the most suitable method to estimate daily Class A pan evaporation. The statistics criteria of this model which is constituted based on the 5 input parameters were R2=0.85, RMSE=1.61 and MAE=1.24 mm day-1. The sensitivity analysis of NF model revealed that the estimated EP is more sensitive to T and U2 (as the input variables), respectively. Due to weak accuracy of SS method, a new modification step of the model was also developed based on the SR and T in order to have a more exact daily EVAPORATION ESTIMATION of the region. However, the result of the modified model was not acceptable.

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APA: Copy

SHADMANI, M., & MAROFI, S.. (2011). COMPARISON OF SOME METHODS FOR ESTIMATION OF DAILY PAN EVAPORATION: CASE STUDY IN KERMAN REGION. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), 15(55), 69-83. SID. https://sid.ir/paper/14778/en

Vancouver: Copy

SHADMANI M., MAROFI S.. COMPARISON OF SOME METHODS FOR ESTIMATION OF DAILY PAN EVAPORATION: CASE STUDY IN KERMAN REGION. WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES)[Internet]. 2011;15(55):69-83. Available from: https://sid.ir/paper/14778/en

IEEE: Copy

M. SHADMANI, and S. MAROFI, “COMPARISON OF SOME METHODS FOR ESTIMATION OF DAILY PAN EVAPORATION: CASE STUDY IN KERMAN REGION,” WATER AND SOIL SCIENCE (JOURNAL OF SCIENCE AND TECHNOLOGY OF AGRICULTURE AND NATURAL RESOURCES), vol. 15, no. 55, pp. 69–83, 2011, [Online]. Available: https://sid.ir/paper/14778/en

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