Dynamical bias correction procedure to improve global gridded daily streamflow data for local application in the Upper Blue Nile basin

Title:

Dynamical bias correction procedure to improve global gridded daily streamflow data for local application in the Upper Blue Nile basin

Creator:

Lakew, Haileyesus Belay and Moges, Semu Ayalew

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:7f7cf4c3-77e3-4ed0-80e2-2a8b2f448487
uuid:7f7cf4c3-77e3-4ed0-80e2-2a8b2f448487
doi:10.2478/johh-2020-0040

Subject:

Blue Nile, WaterGAP3, bias correction, and water resource reanalysis

Type:

model:article and TEXT

Format:

počítač and online zdroj

Description:

Recently water resources reanalysis (WRR) global streamflow products are emerging from high- resolution global models as a means to provide long and consistent global streamflow products for assessment of global challenge such as climate change. Like any other products, the newly developed global streamflow products have limitations accurately represent the dynamics of local streamflow hydrographs. There is a need to locally evaluate and apply correction factors for better representation and make use of the data. This research focuses on the evaluation and correction of the bias embedded in the global streamflow product (WRR, 0.25°) developed by WaterGAP3 hydrological model in the upper Blue Nile basin part of Ethiopia. Three spatiotemporal dynamical bias correction schemes (temporalspatial variable, temporal-spatial constant and spatial variable) tested in twelve watersheds of the basin. The temporalspatial variable dynamical bias correction scheme significantly improves the streamflow estimation. The Nash-Sutcliffe coefficient (NSCE) improves by 30% and bias decreases by 19% for the twelve streamflow gauging stations applying leave one out cross-validation approach in turn. Therefore, the temporal-spatial variable scheme is applicable and can use as one method for the bias correction to use the global data for local applications in the upper Blue Nile basin.

Language:

Slovak

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

41-48

Source:

Journal of hydrology and hydromechanics | 2021 Volume:69 | Number:1

Harvested from:

CDK

Metadata only:

false