 |
| Titel |
Added value of H-ADCP data in rainfall-runoff models driven by satellite rainfall input in a tropical basin |
| VerfasserIn |
Hidayat Hidayat, Ton Hoitink, Maximiliano Sassi, Bart Vermeulen, Paul Torfs, Remko Uijlenhoet |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250054626
|
|
|
|
|
|
| Zusammenfassung |
| Despite the importance of hydrological records, large regions in the world remain ungauged
and the number of permanent gauge locations tends to decline worldwide. Therefore, building
hydrological models in poorly gauged basins is a timely challenge. Satellite radar provides a
potential means of obtaining distributed rainfall estimates. The aim of this study is to explore
the added value of discharge data series derived from a horizontal acoustic Doppler current
profiler (H-ADCP) measurements in a rainfall-runoff model driven by satellite rainfall
estimates from the Tropical Rainfall Measuring Mission (TRMM). The focus of
this study is the Mahakam catchment, a meso-scale tropical basin (77,100 km2)
in East Kalimantan, Indonesia. This catchment represents a poorly gauged basin
susceptible to El Niño-Southern Oscillation variability. H-ADCP discharge measurements
were carried out between March 2008 and August 2009. For the same period a
rating curve was developed for the gauge station at Melak. The discharge series
obtained were split into calibration and validation data sets. The HBV (Hydrologiska
Byrans Vattenbalansavdelning) and VIC (Variable Infiltration Capacity) models
were used in rainfall-runoff modelling of the Mahakam catchment upstream of
Melak. We applied the HBV model with lumped input and the VIC model with
distributed input forcing with a grid size of 0.25Ë . An evaluation based on the
Nash-Sutcliffe model efficiency criteria showed that both models performed similarly when a
discharge data source was used for calibration. The results of the model performance
evaluation indicated that model calibration with H-ADCP data produced a relatively
robust parameter set. Although satellite rainfall estimates have higher uncertainties
compared to ground-based rainfall measurements, they are potentially useful for
rainfall-runoff modelling in a poorly gauged basin. Continuous data series from H-ADCP
measurements gave an added value to provide accurate discharge estimates for
calibrating and evaluating rainfall runoff models driven by TRMM rainfall estimates. |
|
|
|
|
|
|