Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/hess-2016-413
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Aug 2016
Review status
A revision of this discussion paper is under review for the journal Hydrology and Earth System Sciences (HESS).
Using Satellite-Based Evapotranspiration Estimates to Improve the Structure of a Simple Conceptual Rainfall-Runoff Model
Tirthankar Roy1, Hoshin V. Gupta1, Aleix Serrat-Capdevila1,2, and Juan B. Valdes1 1Department of Hydrology and Atmospheric Sciences, The University of Arizona, Tucson, AZ, USA
2Water Global Practice, The World Bank, Washington DC, USA
Abstract. Daily, quasi-global (50° N-S and 180° W-E), satellite-based estimates of actual evapotranspiration at 0.25° spatial resolution have recently become available, generated by the Global Land Evaporation Amsterdam Model (GLEAM). We investigate use of these data to improve the performance of a simple lumped catchment scale hydrologic model driven by satellite-based precipitation estimates to generate streamflow simulations for a poorly gauged basin in Africa. In one approach, we use GLEAM to constrain the evapotranspiration estimates generated by the model, thereby modifying the daily water balance and improving model performance. In an alternative approach, we instead change the structure of the model to improve its ability to simulate actual evapotranspiration (as estimated by GLEAM). Finally, we test whether the GLEAM product is able to further improve the performance of the structurally modified model. The results suggest that the modified model can provide improved simulations of both streamflow and evapotranspiration, even if GLEAM-satellite-based evapotranspiration data are not available.

Citation: Roy, T., Gupta, H. V., Serrat-Capdevila, A., and Valdes, J. B.: Using Satellite-Based Evapotranspiration Estimates to Improve the Structure of a Simple Conceptual Rainfall-Runoff Model, Hydrol. Earth Syst. Sci. Discuss., doi:10.5194/hess-2016-413, in review, 2016.
Tirthankar Roy et al.
Tirthankar Roy et al.
Tirthankar Roy et al.

Viewed

Total article views: 344 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
253 78 13 344 15 22

Views and downloads (calculated since 23 Aug 2016)

Cumulative views and downloads (calculated since 23 Aug 2016)

Viewed (geographical distribution)

Total article views: 344 (including HTML, PDF, and XML)

Thereof 339 with geography defined and 5 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 18 Jan 2017
Publications Copernicus
Download
Short summary
This study presents and compares two different approaches of using satellite-derived estimates of actual evapotranspiration (ET) to improve the performance of a conceptual rainfall-runoff model. In the first approach, the ET process within the model is constrained using the satellite ET estimates, while in the second one, the model structure is altered. Results indicate that both the approaches improve streamflow forecasting, while the second one also improves the ET simulations significantly.
This study presents and compares two different approaches of using satellite-derived estimates...
Share