Modeling the History of the Great Rivers of the World - PowerPoint PPT Presentation

1 / 11
About This Presentation
Title:

Modeling the History of the Great Rivers of the World

Description:

... Conference on Rivers and Civilization. June 25-28, ... Tigris and Euphrates. Even neighboring rivers have different histories. Yenisey River, Russia ... – PowerPoint PPT presentation

Number of Views:235
Avg rating:3.0/5.0
Slides: 12
Provided by: ccr63
Category:

less

Transcript and Presenter's Notes

Title: Modeling the History of the Great Rivers of the World


1
Modeling the History of the Great Rivers of the
World
  • R. A. Bryson, A. H. Ruter, and K. A. McEnaney
  • University of Wisconsin-Madison

International Conference on Rivers and
Civilization June 25-28, 2006 in La Crosse, WI
2
Archaeoclimatology Macrophysical Climate
Modeling (MCM)
  • Based on circulation of the atmosphere
  • Jet stream, sub tropical highs, ITC
  • Relationship of circulation to local climate
  • Circulation controlled by incoming solar
    radiation modulated by volcanic aerosols and
    surface conditions

3
Archaeoclimatology Macrophysical Climate
Modeling (MCM)
  • Stream discharge integrates climate over the
    catchment
  • Modern gauging data as input
  • Robust hypotheses

4
The Nile River
  • The Model matches the proxy record quite well

5
Mississippi Amazon Rivers
  • Northern vs. Southern Hemisphere circulation

6
Congo and Zambezi Rivers
  • Some rivers are affected by both northern and
    southern regimes

7
Tigris and Euphrates
  • Even neighboring rivers have different histories

8
Yenisey River, Russia
  • The spring freshet has gotten later in Siberia -
    but not linearly so

9
Fitzroy River, Australia
  • Seasonality Wet vs. Dry Months

10
Conclusions
  • These models provide specific hypotheses
  • Robust compared to field data
  • Explanations for timing / size of changes
  • Geomorphologically testable
  • Global applicability
  • Cannot generalize between rivers
  • Work is underway on 100-yr resolution
  • 250 Rivers modeled. Contact
    rabryson_at_wisc.edu

11
Bryson, R. A., K.A. McEnaney, and A.H. Ruter
2006    Modeling the History of the Great Rivers
of the World. Paper presented at the
International Conference on Rivers and
Civilization, June 25-28, La Crosse, WI.
Write a Comment
User Comments (0)
About PowerShow.com