DTM-Based Model for Global-Scale Runoff Routing


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Table of Contents

PPT Slide

PPT Slide

DTM-Based Model for Global-Scale Runoff Routing



Source-to-Sink Routing Model


Drainage Area of the Sinks

Land Boxes

Runoff Boxes (T42 Data)


Flow Length to the Sinks

Distance-Area Diagrams

Global Runoff

Routing Algorithm

Routed vs Unrouted Hydrographs

Source-to-Sink vs. Cell-to-Cell

Conclusions (1)

Conclusions (2)

PPT Slide


9 Data Layers 3 Resolutions

The National Geophysical Data Center TerrainBase Global DTM Version 1.0 [Row et al., 1995]

The CIA World Data Bank II [Gorny and Carter, 1987]

Data and Analysis Methods

1) Determination of a land/sea mask

TerrainBase Land Only

2) Geolocation or ‘burning in’ of rivers

3) Filling of artificial depressions

Stream channel comparison

4,5) Calculation of flow directions and accumulations

Grayscale flow direction map

Grayscale flow accumulation map

6) Selection and delineation of rivers

Flow accumulation thresholds for different sized analysis regions

7) Selection and delineation of watersheds

7a) Selection and delineation of internally draining areas

7b) Selection and delineation of 19 global drainage regions

7c) Extension of 19 global drainage regions to include water bodies

8) Lake Delineation

Runoff Data Top 10 of 55 rivers by total runoff

Changing resolutions

Effects of Resolution 1

Effects of Resolution 2

Author: Steve Graham

Email: maidment@mail.utexas.edu

Home Page: http://www.ce.utexas.edu/prof/maidment

Other information:
AMS Meeting, Dallas, Jan 1999

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