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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

Global Hydrology and Resampling Flow Direction Data

April 22, 1999


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Outline

  • Introduction

    • Global Hydrology and Climate System Model

  • Resampling Programs

    • Methodology

    • Interesting Concepts

    • River Networks


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Global Hydrology

  • Tele-Connections

  • Interdisciplinary Studies


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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


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Model Output

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


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Ocean Model

  • Compliments of LANL Parallel Ocean Program


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Global River Network

  • Create manageable river network using fine resolution data

  • View of the world

    • Grid cells

    • Watersheds


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Resampling Programs

  • Fine Resolution Flow Direction Data - 1 km

  • Coarse Resolution Output - 2.814°


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Resampling Methods

  • Two Methods

    • Inverse Maximum

    • Maximum Flow Accumulation

  • Written in Arc Macro Language (AML)


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Inverse Method

  • Inputs

    • Flow Direction Grid

    • Scale Factor

    • Stream Delineation Threshold

  • Concept

1 ELEVATION

MAXFAC


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Inverse Method Output

Fine Resolution River Network

Inverse Output, ~200 scale factor


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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


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Maximum Output

  • Export the PAT to Excel, Word

  • Generate Line Coverage


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Future Work

  • Examine Inverse Method Completely

  • Add perks to Maximum Method

    • Code for Continental Margin

    • Flowlength Column

  • Write Comparison


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Appreciations

Thank you

Jay Famiglietti

Francisco Olivera

Kwabena Asante


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