Comparing Different Weather Generator Algorithms for Daily Temperature as an Influential Factor on Crop Irrigation Requirement

Publish Year: 1393
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

NCWC02_294

تاریخ نمایه سازی: 7 آبان 1393

Abstract:

Weather Generators (WGs) are widely used in water engineering, agriculture, ecosystem and climate change studies because observed climatic series have deficiencies related to length, completeness and spatial coverage.WG models can simulate daily temperature data in a few parametric ways. One way is to simulate daily minimum (Tmin) and maximum (Tmax) temperatures using an autoregressive model. Another way consists of the simulation of daily average temperature (Tav) and daily temperature range (R) and then the calculation of Tmin and Tmax indirectly. In this study, four different algorithms were assessed for daily temperature in combination with a well-tested weather generator. M1 and M2 algorithms simulated the daily Tav and R values directly and Tmin and Tmax indirectly. M3 algorithm simulated Tmin and Tmax and M4 algorithm simulated Tmin and Tav directly and the other variables indirectly. The results showed that each algorithm could perform better in simulating primary variables (which are simulated directly). This issue was more considerable in relation to daily R values. M2 overestimated the crosscorrelation coefficients of this variable because of the assumption of a strong autocorrelation structure between primary variables in the WG model. M3 and M4 outperformed the other algorithms in relation to most studied indices. This study showed the importance of choosing the best temperature generation algorithm according to the requirements.

Authors

Behnam Ababaei

Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran

Hadi Ramezani Etedali

Assistant Professor, Water Engineering Department, Imam Khomeini International University, Qazvin, Iran

Mahdi Sarai Tabrizi

Young Researchers and Elites Club, Science and Research Branch, Islamic Azad University, Tehran, Iran

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