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To accommodate the inherent non-linearity and non-stationarity of many natural time series, empirical mode decomposition (EMD) and Hilbert-Huang transform (HHT) provide an adaptive and efficient method. The HHT is based on the local characteristic time scale of the data. The HHT method provides not only a precise definition in time-frequency representation than the other conventional signal processing methods, but also more physically meaningful interpretation of the underlying dynamic processes. The EMD also works as a filter to extract the variability of signals with different scales and is applicable to non-linear and n- stationary processes. This promising algorithm has been applied in many fields since it was developed, but it has not been applied to hydrological and climatic time series. The discussion in this book starts with several simulated data sets in order to investigate the capability of this method and to compare it to other conventional frequency-domain analysis methods that assume stationarity. Rainfall, streamflow, temperature, wind speed time series and lake temperature data are investigated in this study. The aim of the work is to investigate periodicity, long term oscillations and trends embedded in these data by using HHT. The analysis is performed in both the time and frequency domains. The results from HHT are compared to those from the multi-taper method (MTM) which is based on Fourier Transform of the data.
" I believe Hilbert-Huang Transform Analysis of Hydrological and Environmental Time Series will satisfy researchers in any discipline who analyze nonstationary and/or nonlinear time series. The book does not claim to be a final word on the merits of the HHT, but it does extend empirical claims regarding the potential effectiveness of the HHT. There are no exercises, although the book could be used in a teaching setting.
Overall, I was glad to read the book and believe the HHT is well worth continued study as a potentially effective tool in the challenging area of nonstationary and non-linear time series analysis."
Tom Burr, Statistical Sciences, Los Alamos National Laboratory, Los Alamos, NM, USA
Autorentext
I. GENERAL INFORMATION
Name: A. Ramachandra Rao
Date of Birth: 23 October 1939
Academic Record
School Attended Degree Date
University of Illinois 1964-68 Ph.D. 1968
University of Minnesota 1962-64 M.S.C.E. 1964
University of Mysore (India) 1956-60 B.E. 1960
Employer Position Date
University of Mysore Lecturer in Civil 1960-62
(India) Engineering
University of Minnesota Research Assistant 1962-64
University of Illinois Research Assistant 1964-68
Purdue University Visiting Assistant 1968-70
Professor
Purdue University Assistant Professor 1970-73
Govt. of New Zealand NRAC Senior Research Fellow 1977-78
Purdue University Associate Professor 1973-80
Purdue University Professor 1980-
Construction Engineering Visiting Faculty May-July, 1983
Research Laboratory Member 1983
Purdue University Acting Head, Hydraulics 1983-84
and Systems Engineering Area
Indian Institute of Science, Visiting Professor of Jan-July,
Bangalore, India Civil Engineering 1989
University of Illinois, Visiting Professor of Jan-May
Urbana, IL Civil Engineering 1998
Awarded a Senior Research Fellowship by the National Research Advisory Council, Government of New Zealand, for research in hydrology with the Ministry of Works and Development during 1977-78.
Awarded (but not accepted) a "Senior Scientist Fellowship" by the Alexander Von Humboldt Foundation, West Germany (1977).
Awarded (but not accepted) the "C.H. Munro Fellowship" of the Water Research Foundation of Australia, for research in Hydrology, at Monash University, Clayton, Victoria, Australia (1977).
Honorary Societies
Member, Chi Epsilon, Sigma Xi
Citations
American Men and Women of Science
Who's Who inthe Midwest
Who's Who in Frontier Science and Technology
Who's Who in Science and Engineering
Who's Who, Environmental Registry
Who's Who in the World
Who's Who in American Education
Invited Activities and Lectures
Invited by UNESCO to attend the "International Symposium on Hydrologic Aspects of Droughts", New Delhi, 3-8 December 1979.
Member, American Delegation to the XVIII General Assembly, IUGG, Hamburg, Federal Republic of Germany, August 15-27, 1983.
Invited Specialist, IAWPRC Seminar on "Rainfall as the Basis for Urban Runoff Design and Analysis", Technical University of Denmark, Lyngby, Denmark, August 24-26, 1983.
Invited lecture, "Detection of Climatic Changes in Hydrologic Time Series". Eighth IHD Endowment Lecture, Anna University, Madras, India, April 13, 1989.
Keynote lecture, "Bayesian Unit Hydrographs" International Conference on Hydrology and Water Resources, Delhi, India, December, 1993.
Member, Editorial Board of "Water Science and Technology Library", Kluwer Academic Publishers B.V. Dordrecht, The Netherlands, (1993-99).
Editor, "Journal of Irrigation and Drainage Engineering", ASCE, 1992 - 1998.
Keynote lecture, "Bayesian Unit Hydrographs" International Conference on Hydrology and Water Resources, Delhi, India, December, 1993.
Founder/honorary member, "Center of Resource Management and Eco-development Studies", I.I.T., Delhi, 1994.
Fellow, Indian Association of Hydrologists.
"Edmund M. Burke Outstanding Civil Engineering Professor", School of Civil Engineering, Purdue University, April 1995.
Invited paper, "Principal Component Analysis of Hydrologic Data", A.R. Rao and T.T. Burke, Jr., NATO Advanced Research Workshop on "Integrated Approach to Environmental Data Systems", Izmir, Turkey, Sept. 16-20, 1996.
Invited to deliver a keynote paper in the International Symposium on "Emerging Trends inHydrology", Department of Hydrology, University of Roorkee, India, Sept. 25-27, 1997.
tßp, Dean Marion B. Scott 1997 Exemplary Character Award, Purdue University.
Invited speaker, Int. Conference on Water, Environment, Ecology, Socio-Economics and Health Engineering, Seoul National University, Seoul, Korea, Oct. 18-21, 1999.
Invited speaker, Int. Conference on Integrated Water Resources Management for Sustainable Development, Roorkee, India, Dec. 2000.
Invited speaker, Golden Jubilee Celebration of the Civil Engineering Department, Indian Institute of Science, Bangalore, India, July 2001.
Keynote Address, "Studies in Regionalization of Watersheds, International Conference on Water and Environment, Bhopal, India, 20 pp., Dec. 15-18, 2003.
State and National Offices
Chairman of the Engineering Division of the Indiana Academy of Sciences (1978-79)
Member, American Society of Civil Engineers
Member, American Association for the Advancement of Science
Member, American Geophysical Union
Member, International Association for Hydraulic Research
National Committee Activity
Member, Task Committee on Rainfall-Runoff Quality
Data Systems, Urban Water Resources Council, ASCE (1970-71)
Member, Task Committee on Effects of Urbanization on Low Flow, Total
Runoff, Infiltration and Groundwater Recharge, ASCE (1974-76)
Member, Surface Water Hydrology Committee, Hydraulics Division,
American Society of Civil Engineers (1979-present)
Member, Committee on Surface Water, Irrigation and Drainage
Division, American Society of Civil Engineers (1979-present).
Member, Control Group (1982-present), Vice Chairman (1983-84).
Chairman (1984-85), Past Chairman (1985-86)
Member, Committee on Hydrology, American Meteorological Society (1985-87)
Member, TaskCommittee on Risk, Hydraulics Division, ASCE (1984-85).
Member, Task Committee on Infiltration Manual, Surface Water Committee, Irrigation and
Drainage Division, ASCE (1986-present)
Member, Control Group, Pu…