Analysis of cross-correlated chaotic streamflows |
| |
| Authors: | AMIN ELSHORBAGY U S PANU S P SIMONOVIC |
| |
| Institution: | 1. Kentucky Water Research Institute, University of Kentucky , Lexington, KY, 40506-0107, U.S.A. E-mail: aelsh0@engr.ukv.edu;2. Civil Engineering Department , Lakehead University , Thunder Bay, Ontario, P7B 5E1, Canada E-mail: umed.panu@lakeheadu.ca;3. Department of Civil and Environmental Engineering , University of Western Ontario , London, Ontario, N6A 5B9, Canada E-mail: simonovic@uwo.ca |
| |
| Abstract: | Abstract A trial is made to explore the applicability of chaos analysis outside the commonly reported analysis of a single chaotic time series. Two cross-correlated streamflows, the Little River and the Reed Creek, Virginia, USA, are analysed with regard to the chaotic behaviour. Segments of missing data are assumed in one of the time series and estimated using the other complete time series. Linear regression and artificial neural network models are employed. Two experiments are conducted in the analysis: (a) fitting one global model and (b) fitting multiple local models. Each local model is in the direct vicinity of the missing data. A nonlinear noise reduction method is used to reduce the noise in both time series and the two experiments are repeated. It is found that using multiple local models to estimate the missing data is superior to fitting one global model with regard to the mean squared error and the mean relative error of the estimated values. This result is attributed to the chaotic behaviour of the streamflows under consideration. |
| |
| Keywords: | chaos missing data noise reduction neural network regression local approximation global approximation |
|
|
