 |
| Titel |
Assessment of satellite rainfall products for streamflow simulation in medium watersheds of the Ethiopian highlands |
| VerfasserIn |
M. M. Bitew, M. Gebremichael |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 4 ; Nr. 15, no. 4 (2011-04-08), S.1147-1155 |
| Datensatznummer |
250012742
|
| Publikation (Nr.) |
 copernicus.org/hess-15-1147-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| The objective is to assess the suitability of commonly used high-resolution
satellite rainfall products (CMORPH, TMPA 3B42RT, TMPA 3B42 and PERSIANN) as
input to the semi-distributed hydrological model SWAT for daily streamflow
simulation in two watersheds (Koga at 299 km2 and Gilgel Abay at 1656 km2)
of the Ethiopian highlands. First, the model is calibrated for
each watershed with respect to each rainfall product input for the period
2003–2004. Then daily streamflow simulations for the validation period
2006–2007 are made from SWAT using rainfall input from each source and
corresponding model parameters; comparison of the simulations to the
observed streamflow at the outlet of each watershed forms the basis for the
conclusions of this study. Results reveal that the utility of satellite
rainfall products as input to SWAT for daily streamflow simulation strongly
depends on the product type. The 3B42RT and CMORPH simulations show
consistent and modest skills in their simulations but underestimate the
large flood peaks, while the 3B42 and PERSIANN simulations have inconsistent
performance with poor or no skills. Not only are the microwave-based
algorithms (3B42RT, CMORPH) better than the infrared-based algorithm
(PERSIANN), but the infrared-based algorithm PERSIANN also has poor or no
skills for streamflow simulations. The satellite-only product (3B42RT)
performs much better than the satellite-gauge product (3B42), indicating
that the algorithm used to incorporate rain gauge information with the goal
of improving the accuracy of the satellite rainfall products is actually
making the products worse, pointing to problems in the algorithm. The effect
of watershed area on the suitability of satellite rainfall products for
streamflow simulation also depends on the rainfall product. Increasing the
watershed area from 299 km2 to 1656 km2 improves the simulations
obtained from the 3B42RT and CMORPH (i.e. products that are more reliable
and consistent) rainfall inputs while it deteriorates the simulations
obtained from the 3B42 and PERSIANN (i.e. products that are unstable and
inconsistent) rainfall inputs. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|