HR: 0800h
AN: H31B-0354    [Abstracts]
TI: The drop-like nature of rain and its invariant statistical properties
AU: * Ignaccolo, M
EM: mi8@phy.duke.edu
AF: FEL laboratory, Department of Physics, Duke University, Science dr., Box 90305, Durham, NC 27708, United States
AU: De Michele, C
EM: carlo.demichele@polimi.it
AF: Politecnico di Milano, Department of Hydraulic, Environmental, Roads and Surveying Engineering, 32, P.zza L. da Vinci, Milano, I20132, Italy
AU: Bianco, S
EM: sbianco@unt.edu
AF: University of North Texas, Center for Nonlinear Science, Department of Physics, P.O. Box 311427, Denton, TX 76203-1427, United States
AB: We look for statistically invariant properties of the sequences of inter drop time intervals and drop diameters. We provide evidences that these invariant properties are 1) Large inter drop time intervals, ≥10s, separate drop of small diameter, ≤0.6mm. 2) The rainfall phenomenon has 2 phases; a quiescent phase whose contribution to the total cumulated flux is virtually null, and an active, non-quiescent, phase responsible for the bulk of the precipitated volume. 3) The probability density function of inter drop time intervals has a power law scaling regime in the range 1min-1h. 4) Once the moving average and moving standard deviation are removed from the sequence of drop diameters, an invariant shape emerges for the probability density function of drop diameters during active phases.
DE: 1854 Precipitation (3354)
DE: 1872 Time series analysis (3270, 4277, 4475)
DE: 4475 Scaling: spatial and temporal (1872, 3270, 4277)
SC: Hydrology [H]
MN: 2007 Fall Meeting