PPT Slide
DTM-Based Model for Global-Scale Runoff Routing
Motivation
Goals
Source-to-Sink Routing Model
Sinks
Drainage Area of the Sinks
Land Boxes
Runoff Boxes (T42 Data)
Sources
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)
Introduction
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
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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