Preprint Article Version 1 This version is not peer-reviewed

Correction and Informed Regionalization of Precipitation Data in a High Mountainous Region (Upper Indus Basin) and Its Effect on SWAT-Modelled Discharge

Version 1 : Received: 12 September 2018 / Approved: 13 September 2018 / Online: 13 September 2018 (13:49:01 CEST)

How to cite: Khan, A.J.; Koch, M. Correction and Informed Regionalization of Precipitation Data in a High Mountainous Region (Upper Indus Basin) and Its Effect on SWAT-Modelled Discharge. Preprints 2018, 2018090241 (doi: 10.20944/preprints201809.0241.v1). Khan, A.J.; Koch, M. Correction and Informed Regionalization of Precipitation Data in a High Mountainous Region (Upper Indus Basin) and Its Effect on SWAT-Modelled Discharge. Preprints 2018, 2018090241 (doi: 10.20944/preprints201809.0241.v1).

Abstract

The current study applied a new approach for the interpolation and regionalization of observed precipitation series to a smaller spatial scale (0.125° by 0.125° grid) across the Upper Indus Basin (UIB), with appropriate adjustments for the orographic effect and changes in glacier storage. The approach is evaluated and validated through reverse hydrology, guided by observed flows and available knowledge base. More specifically, the generated corrected precipitation data is validated by means of SWAT-modelled responses of the observed flows to the different input precipitation series (original and corrected ones). The results show that the SWAT- simulated flows using the corrected, regionalized precipitation series as input are much more in line with the observed flows than those using the uncorrected observed precipitation input for which significant underestimations are obtained.

Subject Areas

Precipitation estimation, Orographic correction factor (OCF), Water balance, Glacier mass balance, SWAT-hydrological model, Upper Indus Basin (UIB), reverse hydrology

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