 |
| Titel |
Constraining distributed hydrological models with a high-resolution digital elevation model derived from Lidar data for a small watershed in a boreal landscape |
| VerfasserIn |
C. Auterives, H. Lange, E. Leblois, S. Beldring, L. Gottschalk |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027659
|
|
|
|
|
|
| Zusammenfassung |
| In high-latitude areas, landscapes with flat or moderate relief areas usually contain lakes and
mires. The identification of flowpaths in such areas is a difficult issue. The increasing
availability of high resolution topography from airborne Lidar measurements offers new
opportunities for automatic or semi-automatic channel extraction from DEMs in small
watersheds, substantially outperforming the hydrographic network in conventional digital
maps.
This work describes an approach to automatically extract the spatial structure of a drainage
network and thereby produce a partition of the catchment into drainage sub-basin
polygons from Lidar data. We demonstrate the procedure for the test case of the
4.8 km2 Langtjern watershed in southeast Norway. It represents a typical boreal
low-productive landscape with a mosaic of forests, mires and lakes. Here, areal cover and
local slope are intimately linked: lakes and ponds dominate in the flattest areas, low
slope areas are occupied by peatbogs, and the steepest parts of the catchment are
covered by forest. The results of the extraction, the hydrographic network, and
the identification of bogs and lakes, are input to a distributed hydrological model
(DEW model system, Beldring, 2008), constraining the model structure to a large
extent.
An explicit description of the drainage network and the physical landscape properties in the
watershed is warranted, providing the capability to predict hydrological state variables and
fluxes from atmospheric data. As a result, the model accurately represents the heterogeneities
in space and time of the various hydrological processes.
Reference
Beldring, S. 2008. Distributed element water balance model system. Norwegian Water
Resources and Energy Directorate, Report no. 4/2008, 40 pp |
|
|
|
|
|
|