 |
| Titel |
Modelling canopy and litter interception in commercial forest plantations in South Africa using the Variable Storage Gash model and idealised drying curves |
| VerfasserIn |
H. H. Bulcock, G. P. W. Jewitt |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 12 ; Nr. 16, no. 12 (2012-12-18), S.4693-4705 |
| Datensatznummer |
250013613
|
| Publikation (Nr.) |
 copernicus.org/hess-16-4693-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| There remains a gap in the knowledge of both canopy and litter interception
processes in forest hydrology and limitations in the models used to
represent them. In South Africa, interception is typically considered to
constitute only a small portion of the total evaporation and in some models
is disregarded. Interception is a threshold process, as a certain amount of
water is required before successive processes can take place. Therefore an
error or false assumption introduced in modelling interception will
automatically introduce errors in the calibration of subsequent
models/processes. Field experiments to assess these processes, viz. canopy and
litter interception were established for the three main commercial forestry
genera in South Africa, namely Pinus, Acacia and Eucalyptus, which are described in a companion paper.
Drawing on both field and laboratory data, the "Variable Storage Gash"
model for canopy interception and an idealised drying curve litter
interception model were developed to represent these processes for South
African conditions. The Variable Storage Gash model was compared with
the original Gash model and it was found that it performed better than the original model in forests with high
storage capacities yet was similar to the original model in stands with a
low storage capacity. Thus, the models developed here were shown to adequately
represent the interception processes and provide a way forward for more
representative water resources planning modelling. It was found that canopy
and litter interception can account for as much as 26.6% and 13.4% of
gross precipitation, respectively, and are therefore important hydrological
processes to consider in forested catchments in South Africa. Despite the
limitation of both the Variable Storage Gash model and the idealised
drying curve litter interception model being reliant on empirical
relationships, their application highlights the importance of considering
canopy and litter interception in water resources management and planning. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|