Global change and space-time multifractal behavior of river runoff
Abstract
To investigate the influence of climate on river runoff processes we use about three million river runoff measurements at very different locations all over the World. This database permits valuable space-time multifractal analyses and modeling of the runoff process. On seasonal time-scales, the influence of climatic changes becomes immediately visible by the change in the scaling behavior of such multifractal runoff. To illustrate how such runoff processes can by affected by climatic changes - both on much longer as well as on much shorter time-scales, we use two rather exotic data sets. The first is a series of 1515 annual values teperature proxies fron South American ice boreholes. The second is an extreme rain event from Grenoble (France) during the summer of 1992. We demonstrate how our results allow a unification within the multifractal framework of both basin factors and climatic change which strongly modify precipitation input. It is a significant improvement with respect to current modeling and forecasting of river runoff phenomena.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2002
- Bibcode:
- 2002AGUFMNG72A0911T
- Keywords:
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- 1699 General or miscellaneous;
- 1836 Hydrologic budget (1655);
- 1860 Runoff and streamflow;
- 3250 Fractals and multifractals