Effects of rainfall spatial distribution on the relationship between rainfall spatiotemporal resolution and runoff prediction accuracy

Changhwan Kim, Dae Hong Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

We studied how rainfall spatial distribution affects the relationship between rainfall spatiotemporal resolution and runoff prediction accuracy under real field conditions. We gathered radar rainfall and discharge data for three rainfall events. These rainfall-runoff events were then reproduced using a kinematic wave model. Modeling accuracy was estimated quantitatively using the Nash-Sutcliffe model efficiency coefficient and peak discharge ratio. Normalized root-mean-square error (nRMSE), skewness (Sk), and second scaled spatial moment of catchment rainfall (δ2) were employed to quantify rainfall spatial distribution characteristics. By relating the accuracy of modeling results to the rainfall spatial characteristics using various rainfall spatiotemporal resolutions, we found that the modeling results converged to a value as the nRMSE, Sk and 1 - δ2 decreased. That is, rainfall spatial distributions affect the relationship between lower limit of rainfall spatiotemporal resolution for runoff models and runoff prediction accuracy.

Original languageEnglish
Article number846
JournalWater (Switzerland)
Volume12
Issue number3
DOIs
StatePublished - 1 Mar 2020

Keywords

  • Physically based model
  • Prediction accuracy
  • Rainfall distribution
  • Rainfall resolution
  • Rainfall-runoff

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