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Mary Lear

Mary Lear. Global Hydrology and Resampling Flow Direction Data April 22, 1999. Outline. Introduction Global Hydrology and Climate System Model Resampling Programs Methodology Interesting Concepts River Networks. Global Hydrology. Tele-Connections Interdisciplinary Studies .

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Mary Lear

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  1. Mary Lear Global Hydrology and Resampling Flow Direction Data April 22, 1999

  2. Outline • Introduction • Global Hydrology and Climate System Model • Resampling Programs • Methodology • Interesting Concepts • River Networks

  3. Global Hydrology • Tele-Connections • Interdisciplinary Studies

  4. Climate System Model National Center for Atmospheric Research (NCAR) Boulder, Colorado • Predict greenhouse gas effects • Predict El Nino - La Nina • Precipitation-Evaporation • Deforestation changes • Ocean heating/cooling system • Historical Analysis

  5. Model Output • Model output from 6 year run with 1% of land surface accounted for as surface water

  6. Ocean Model • Compliments of LANL Parallel Ocean Program

  7. Global River Network • Create manageable river network using fine resolution data • View of the world • Grid cells • Watersheds

  8. Resampling Programs • Fine Resolution Flow Direction Data - 1 km • Coarse Resolution Output - 2.814°

  9. Resampling Methods • Two Methods • Inverse Maximum • Maximum Flow Accumulation • Written in Arc Macro Language (AML)

  10. Inverse Method • Inputs • Flow Direction Grid • Scale Factor • Stream Delineation Threshold • Concept 1 ELEVATION MAXFAC

  11. Inverse Method Output Fine Resolution River Network Inverse Output, ~200 scale factor

  12. 1 2 10 12 Maximum Method • Input • Flow Direction Grid • Projected Coarse Resolution Mesh • Checking Distance 1 2 FAC1 FAC2 10 12 • Concept FAC10 Downstream FAC12

  13. Maximum Output • Export the PAT to Excel, Word • Generate Line Coverage

  14. Future Work • Examine Inverse Method Completely • Add perks to Maximum Method • Code for Continental Margin • Flowlength Column • Write Comparison

  15. Appreciations Thank you Jay Famiglietti Francisco Olivera Kwabena Asante

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