APPLYING FOURIER AND WAVELET TRANSFORMS TO EXTRACT INSTANTANEOUS UNIT HYDROGRAPH

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GHIAMI BAJGIRANI A.; SHARIFI M.B.; FAGHFOUR MAGHREBI M.; AREFIJAMAAL A.

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Journal: IRAN-WATER RESOURCES RESEARCH Year:2010 | Volume:6 | Issue:2 (17) Page(s): 6-7

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Title

APPLYING FOURIER AND WAVELET TRANSFORMS TO EXTRACT INSTANTANEOUS UNIT HYDROGRAPH

Author(s)

GHIAMI BAJGIRANI A. | SHARIFI M.B. | FAGHFOUR MAGHREBI M. | AREFIJAMAAL A. | Issue Writer Certificate

Keywords

INSTANTANEOUS UNIT HYDROGRAPHQ4

FAST FOURIER TRANSFORMQ4

WAVELETQ4

Abstract

Introduction: The methods of system identification used to estimate the ordinates of INSTANTANEOUS UNIT HYDROGRAPH (IUH) encounter the presence of noise in the form of oscillation. Noise in the IUH originates from the errors in the rainfall- runoff data and the linear assumptions in unit hydrograph theory. Rao and Delleur (1971) used Fourier transform to estimate IUH. In their work noise is controlled by the moving average technique. The aperiodic and transient signals with short duration (like in an IUH) are signals for which WAVELET transform are particularly useful. Chou and Wang (2002) controlled the noise using a Haar WAVELET with a boxcar-like function. Soman and Ramachandran (2005) showed that for smoothly varying signals a smooth WAVELET function such as Daubechies (1992) WAVELETs should be selected. In this paper, the FAST FOURIER TRANSFORMs (FFT) are used to estimate the IUH in the presence of noise. Daubechies WAVELETs are also applied for noise reduction.

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APA: Copy

GHIAMI BAJGIRANI, A., SHARIFI, M.B., FAGHFOUR MAGHREBI, M., & AREFIJAMAAL, A.. (2010). APPLYING FOURIER AND WAVELET TRANSFORMS TO EXTRACT INSTANTANEOUS UNIT HYDROGRAPH. IRAN-WATER RESOURCES RESEARCH, 6(2 (17)), 6-7. SID. https://sid.ir/paper/382793/en

Vancouver: Copy

GHIAMI BAJGIRANI A., SHARIFI M.B., FAGHFOUR MAGHREBI M., AREFIJAMAAL A.. APPLYING FOURIER AND WAVELET TRANSFORMS TO EXTRACT INSTANTANEOUS UNIT HYDROGRAPH. IRAN-WATER RESOURCES RESEARCH[Internet]. 2010;6(2 (17)):6-7. Available from: https://sid.ir/paper/382793/en

IEEE: Copy

A. GHIAMI BAJGIRANI, M.B. SHARIFI, M. FAGHFOUR MAGHREBI, and A. AREFIJAMAAL, “APPLYING FOURIER AND WAVELET TRANSFORMS TO EXTRACT INSTANTANEOUS UNIT HYDROGRAPH,” IRAN-WATER RESOURCES RESEARCH, vol. 6, no. 2 (17), pp. 6–7, 2010, [Online]. Available: https://sid.ir/paper/382793/en

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