Effect of spatial resolution on hydrograph at various scales

Hyejin Ku, So Kazama, Masaki Sawamoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Inevitable uncertainty of a distributed model makes us have a doubt whether data, parameterization, calibration and validation employed in a simulation are appropriate to the model. The present study focused on the uncertainty from data and investigated the effects of resolution and scale on hydrograph. A grid-based rainfall-runoff model was applied to five imaginary catchments with different areal extents. We could investigate the effect of topology and rainfall resolutions by employing spatially variant and invariant rainfall types. Especially, storage coefficients conducting interflow and baseflow were defined as a function of grid size to assess the effect of topologic resolution. Hydrographs for catchment with 100, 2500km2 showed that coarser resolution could bring poor result in the simulation for small catchment. There is, however, almost no difference of hydrographs for resolutions owing to the storage coefficients expressed as grid size. Error contour maps for relative volume error and model efficiency calculated assuming that the result with finest resolution was error-free were drawn with axes of resolution and scale. The contour maps indicated that finer resolution was required for simulation of smaller catchment and the gradient of contour was likely to high for small catchment. The comparison between two rainfall types presented that the topology resolution had more influence on hydrograph than rainfall resolution.

Original languageEnglish
Title of host publication31st IAHR Congress 2005
Subtitle of host publicationWater Engineering for the Future, Choices and Challenges
EditorsJun Byong-Ho, Il Lee Sang, Seo Il Won, Choi Gye-Woon
PublisherKorea Water Resources Association
Pages899-908
Number of pages10
ISBN (Electronic)8987898245, 9788987898247
Publication statusPublished - 2005
Event31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges - Seoul, Korea, Republic of
Duration: 2005 Sep 112005 Sep 16

Publication series

Name31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

Conference

Conference31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges
CountryKorea, Republic of
CitySeoul
Period05/9/1105/9/16

Keywords

  • Distributed model
  • Hydrograph
  • Rainfall
  • Resolution
  • Scale
  • Topology
  • Uncertainty

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Environmental Science (miscellaneous)
  • Water Science and Technology

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