A Forecast Model for Great Lakes Water Levels

Quasi-periodic decadal cycles in levels of lakes Michigan and Huron

“…2. These cycles also agree with the findings of Cohn and Robinson (1976), who performed Fourier transform to reveal suggested periodicities of many scales, including those of ∼8 and ∼ 11-yr. An additional spectral peak at about 6-yr period in Fig. 2 is a harmonic of the 12-yr cycle, and therefore is not likely to represent a separate oscillatory signal.…”

“…1 (blue line), the levels have continually fluctuated throughout this recorded history, and numerous attempts have been made to determine periodic patterns of lake-level change, in order to accurately forecast future levels (DeCooke and Megerian, 1967). Cohn and Robinson (1976) identified numerous interannual cycles in all of the Great Lakes' levels, however, the short-term availability of historic records has thus far disallowed statistically conclusive evidence for any definitive long-term cycles (Thompson and Baedke, 1997).…”

Rural Cofradías: A Comparative Study of Syncretism, Fertility Beliefs, and Communal Worship among Peasants in...the Dominican Republic and the Mayan Regions...

“…For many peasants the priest was much like a master magician and was used to exorcize storms, drive away swarms oflocusts and bless the fields and their fruits. 53 The Church did not deny that supernatural actions were possible, but taught that magic could emanate from only two sources: God or the Devil. 54 Humble friars and poor parish priests dealt with the peasants on a daily basis, while members of the higher clergy tended to be hostile to rural dwellers.…”

Fourier analysis of the Catawba Mountain knolls, Roanoke county, Virginia

“…The mathematical calculations were performed using the FILTRAN computer program documented in Cohn (1975). FILTRAN calculates the one-dimensional Fourier transform which is valid for time or distance functions of finite length.…”