Summary
Maximum Entropy Spectral Analysis (MESA) Method is a powerful alternative to the traditionally used Blackman Tukey (BT) and Fast Fourier Transform (FFT) Methods in hydrologic and climatologic time series analysis. Maximum entropy spectra of annual rainfall time series measured at Mangalore and Waltair and monthly flow time series of Godavari and Krishna Rivers in India are presented and compared with the spectra obtained by using BT and FFT methods. A recently developed Bayesian decision rule is applied to determine the length of filters in MESA. Sensitivity of the maximum entropy spectra to the length of filter used is also discussed.
Zusammenfassung
In hydrologischen und klimatologischen Zeitreihenanalysen stellt die Maximale Entropie Spektralanalyse (MESA) eine Alternative zur traditionellen Blackman-Tukey (BT) und schnellen Fouriertransformation (FFT) dar. Es werden die maximalen Entropiespektra der jährlichen Niederschlagszeitreihe in Mangalore und Waltair und die monatlichen Durchflußzeitreihen der Flüsse Godavari und Krishna (Indien) präsentiert und mit den Spektren, die man durch BT und FFT erhält, verglichen. Eine kürzlich entwickelte Entscheidungsregel wurde herangezogen, um die Filterlänge für MESA zu bestimmen. Der Einfluß der Filterlänge auf die maximalen Entropiespektra wird ebenfalls diskutiert.
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Padmanabhan, G., Rao, A.R. Maximum entropy spectra of some rainfall and river flow time series from southern and central India. Theor Appl Climatol 37, 63–73 (1986). https://doi.org/10.1007/BF00866105
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DOI: https://doi.org/10.1007/BF00866105