SPECTRAL ANALYSIS OF FLOW- PRECIPITATION FLUCTUATIONS IN DINEVAR BASIN

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MIRZAEE S.Y.; AZARI A.; PARHAM G.A.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2017 | Volume:13 | Issue:1 Page(s): 204-210

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Information Journal Paper

Title

SPECTRAL ANALYSIS OF FLOW- PRECIPITATION FLUCTUATIONS IN DINEVAR BASIN

Author(s)

MIRZAEE S.Y. | AZARI A. | PARHAM G.A. | Issue Writer Certificate

Keywords

FLOWQ2

PRECIPITATIONQ2

SPECTRAL ANALYSISQ1

COHERENCY FUNCTIONSQ1

PHASE FUNCTIONSQ1

Abstract

In this research the FLOW-precipitation fluctuations in 9 station in Dinevar basin were analyzed by spectral density functions and Autocorrelation Functions in the frequency and time domain. First fluctuations in the correlogram of each time series were analyzed. Then Spectral density functions based on the Fourier series were used to check the time series in the frequency domain. In this regard, the Spectrum value of each FLOW and rainfall series was calculated and the periodogram of each series was produced. The Periodograms showed fluctuations in several frequencies. These were seasonal fluctuations with frequency 0.083 (return period of 12 months), short term fluctuations with frequency 0.25 (return period of 4 months), and midterm fluctuations with frequency 0.167 (return period of 4 months). Fluctuations were not observed for return period of 6 months in PRECIPITATION data. Cross SPECTRAL ANALYSIS of data showed high match levels in frequencies 0.083 and 0.25. Also the estimated values of delay by cross SPECTRAL ANALYSIS for PRECIPITATION seasonal fluctuations (0.083) and its effect on the seasonal FLOW fluctuations was estimated as about 1.5 months. The delay was determinate as 0.4, 0.5, and 0.14 months for fluctuations with smaller return periods. According to the SPECTRAL ANALYSIS results for PRECIPITATION data in all stations, after removing the frequency and trends, a long term fluctuation (cycle) was observed in frequency 0.01 (100 months) that can be associated to the Wet and dry periods in this region.

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APA: Copy

MIRZAEE, S.Y., AZARI, A., & PARHAM, G.A.. (2017). SPECTRAL ANALYSIS OF FLOW- PRECIPITATION FLUCTUATIONS IN DINEVAR BASIN. IRAN-WATER RESOURCES RESEARCH, 13(1 ), 204-210. SID. https://sid.ir/paper/100412/en

Vancouver: Copy

MIRZAEE S.Y., AZARI A., PARHAM G.A.. SPECTRAL ANALYSIS OF FLOW- PRECIPITATION FLUCTUATIONS IN DINEVAR BASIN. IRAN-WATER RESOURCES RESEARCH[Internet]. 2017;13(1 ):204-210. Available from: https://sid.ir/paper/100412/en

IEEE: Copy

S.Y. MIRZAEE, A. AZARI, and G.A. PARHAM, “SPECTRAL ANALYSIS OF FLOW- PRECIPITATION FLUCTUATIONS IN DINEVAR BASIN,” IRAN-WATER RESOURCES RESEARCH, vol. 13, no. 1 , pp. 204–210, 2017, [Online]. Available: https://sid.ir/paper/100412/en

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