Alghafli, K;
Ali, AM;
Shi, X;
Sloan, W;
Obeid, AAA;
Shamsudduha, M;
(2023)
Evaluation of runoff estimation from GRACE coupled with different meteorological gridded products over the Upper Blue Nile Basin.
Journal of Hydrology: Regional Studies
, 50
, Article 101545. 10.1016/j.ejrh.2023.101545.
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Abstract
Study Region: The Upper Blue Nile (UBN) basin, Ethiopia. Study Focus: In efforts to accurately close the water balance equation for the UBN basin using remote sensing products, river runoff is calculated as a residual from the water balance equation by incorporating Gravity Recovery and Climate Experiment (GRACE) terrestrial water storage (TWS) and remote sensing products for precipitation (P) and evapotranspiration (ET). The calculated river runoff is then compared to the gauge records located at the basin's outlet. The best performing combination among the various combinations is chosen by aggregating rankings attributed to both error and linear fit metrics. The errors associated with each satellite product were assessed by forcing the In-Situ runoff to estimate the P, ET, and TWS. This methodology helps in addressing the uncertainty linked with each hydrological component. New Hydrological Insights for the Region: The best P, ET, and TWS combination performance products to estimate runoff are SM2RAIN-CCI, GLEAM, and GRACE Spherical Harmonic products, respectively. The statistical results for the six metrics are R2 = 0.7, slope = 1.6, y-intercept = - 0.5 cm, RMSE = 3 cm, MAE = 2.8 cm, and PBIAS = 36%. The uncertainty from each hydrological component was quantified and showed that improving the accuracy of P and ET estimation is a crucial step to successfully close the water balance.
| Type: | Article |
|---|---|
| Title: | Evaluation of runoff estimation from GRACE coupled with different meteorological gridded products over the Upper Blue Nile Basin |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.ejrh.2023.101545 |
| Publisher version: | https://doi.org/10.1016/j.ejrh.2023.101545 |
| Language: | English |
| Additional information: | © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | Terrestrial water storage, Precipitation, Evapotranspiration, Water balance, GRACE, Upper Blue Nile basin |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10179523 |
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