 |
| Titel |
Hydrogeomorphic edge-detection and delineation of landscape functional units from high-resolution LIDAR DEMs |
| VerfasserIn |
M. C. Richardson, M.-J. Fortin, B. A. Branfireun |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024458
|
|
|
|
|
|
| Zusammenfassung |
| A new method for delineating hydrogeomorphic elements from high-resolution digital
elevation models (DEMs) is presented. Two case studies are discussed to illustrate the
delineation and typological characterization of hydrologic response units in the Boreal Shield
regions of central and northwestern Ontario, Canada. Briefly, two-dimensional edge-detection
is used to identify boundaries defining abrupt changes in expected hydraulic gradient,
modelled using the
textittan
alphad index of landscape drainage potential. These boundaries effectively discretize the
landscape into structural and functional units exhibiting hydrological and/or biogeochemical
similarity. The technique is robust, scale-adaptive and reasonably parameter insensitive.
Moreover, thresholding and classification of landscape elements is accomplished
using
textitphysically-based geomorphic indices such as the topographic wetness index,
the
textittan
alphad index of landscape drainage potential, and a topographically derived index of mean
residence time. We propose hydrogeomorphic edge-detection as a way to improve the spatial
characterization of Boreal Shield landscapes and to improve conceptualization of hydrologic
and biogeochemical processes in field- and model-based watershed ecosystem research. |
|
|
|
|
|
|