Investigating climatic changes of the wind regime over Western Iran
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RESEARCH NOTE
Investigating climatic changes of the wind regime over Western Iran Zohreh Maryanaji1 and Omid Hamidi2*
Abstract Objective: The aim of the present study was to reveal changes in the wind regime by investigating wind-speed data from meteorological stations in western Iran and comparing them in the last three decades (1986–2015). Results: Two main groups of daily cycles were identified; one group with a single peak and one group with two or more peaks. Using spectral decomposition technique, it was revealed that the heterogeneity observed in the area in terms of altitude and topography results in differences in the density of the spectra with similar frequencies. Two main daily cycles were also identified for each station. Although there were low frequencies, the intensity of the waves at the examined stations was the consequence of the interaction between the frequency, period, and distribution space. By evaluating harmonics in the area, it was revealed that the variance of the first harmonic is maximized in the south and southwest, while the variance of the second harmonic is maximized in the north and northwest. The positive value of the trend in the first harmonic indicated that the trend of the variance for the first harmonic has increased in the central and eastern parts and has decreased in the northern and western parts. Keywords: Wind regime variability, Harmonics, west of iran, Local winds, Homogenization, Spectral analysis, Daily cycle Introduction The increasing urbanization rate, along with the expansion of consumerism and industrial development, have led to an increase in energy consumption in human societies. Fossil fuels are currently the main source of energy worldwide [1]. This leads to the instability of environmental conditions and reduces the success of long-term plans because of the non-renewable nature of these fuels [2]. Climate change is one of the key components of sustainable development, and human needs to recognize these changes to deal with natural destructive phenomena to harness these natural powers including wind for the benefit of mankind [3]. Understanding changes in the *Correspondence: [email protected] 2 Department of Science, Hamedan University of Technology, 65155 Hamedan, Iran Full list of author information is available at the end of the article
wind regime helps human to make use of natural environment and to restrain the wind energy, effectively. Wind plays a very important role in agriculture, urbanization, environment, transportation, energy supply, etc. [4]. Therefore, as one of the climatic elements, identification of temporal–spatial patterns of wind variability is of greate importance [4, 5]. Several studies have been conducted about wind-speed and direction [6–10]. Iran is a vast country with a major part in a warmdry climate that is heavily influenced by climate change. In Western Iran, with over five milion residents, the development and prosperity of economy depend on the energy supply, especially renewabl
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