Cyclical Variations in World-Wide Hydrologic Data

by G.R. Williams,

Serial Information: Journal of the Hydraulics Division, 1961, Vol. 87, Issue 6, Pg. 71-88

Document Type: Journal Paper


Discussion of investigations, performed by engineers and scientists for many years; sunspot numbers as index of solar activity which cause long term variations in hydrologic data; effects of 11 yr sunspot cycle and of assumed 100 yr cycle; data are expressed as ratios to mean in order to obtain dimensionless basis for comparison; 3 yr moving averages; long term variations from mean.

Subject Headings: Hydrologic data | Comparative studies

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