Effects of different precipitation inputs on streamflow simulation in the Irrawaddy River Basin, Myanmar
Study region The Irrawaddy River Basin, Myanmar. Study focus Precipitation is the most important input variable to numerically simulate the hydrological responses of a river basin. Nowadays, a number of precipitation data products with different spatial and temporal resolutions are available. However, the accuracy of these products may vary greatly and the variations may themselves differ in different river basins. Such differences have direct implications on the use of these datasets in...[Show more]
|Sirisena, T. A. J. G.
|Babel, M. S.
|Study region The Irrawaddy River Basin, Myanmar. Study focus Precipitation is the most important input variable to numerically simulate the hydrological responses of a river basin. Nowadays, a number of precipitation data products with different spatial and temporal resolutions are available. However, the accuracy of these products may vary greatly and the variations may themselves differ in different river basins. Such differences have direct implications on the use of these datasets in hydrological modelling. Here, using a hydrological model, we investigated the effects of four precipitation datasets (in-situ gauge precipitation with and without interpolation, PERSIANN-CDR, and CHIRPS) on streamflow simulations in the Irrawaddy Basin in Myanmar. New hydrological insights for the study region We identified considerable differences in streamflow simulation with the use of different precipitation inputs. The four datasets showed varied annual and seasonal precipitation values over the basin. Although the gauge density within the study area is very low, streamflow simulations forced with interpolated gauge data outperformed the models forced with other datasets. However, simulations forced with CHIRPS and PERSIANN-CDR also showed good results in most cases in terms of Nash Efficiency and R2, but mostly with high biases. In calibration, the four precipitation inputs resulted in varied best-fitted parameter values and ranges. All the above observations indicate that the selection of suitable precipitation input(s) is necessary for an accurate investigation of the hydrological responses of any given basin.
|JGS is supported by the Netherlands Fellowship Programme (NFP). RR is supported by the AXA Research Fund and the Deltares Harbour, Coastal and Offshore Research Program.
|© 2018 The Authors.
|Journal of Hydrology: Regional Studies
|Effects of different precipitation inputs on streamflow simulation in the Irrawaddy River Basin, Myanmar
|Imported from ARIES
|040503 - Physical Oceanography
|Sirisena, T.A.J.G., IHE Delft Institute for Water Education
|Maskey, Shreedhar, UNESCO-IHE Institute for Water Education
|Ranasinghe, Roshanka, College of Science, ANU
|Babel, M.S., Asian Institute of Technology
|961199 - Physical and Chemical Conditions of Water not elsewhere classified
|© 2018 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/).
|CC BY-NC-ND license
|ANU Research Publications
This item is licensed under a Creative Commons License