Predicting flood plain inundation for natural channels having no upstream gauged stations


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KAYA C. M. , Tayfur G., GÜNGÖR O.

JOURNAL OF WATER AND CLIMATE CHANGE, vol.10, no.2, pp.360-372, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 10 Issue: 2
  • Publication Date: 2019
  • Doi Number: 10.2166/wcc.2017.307
  • Title of Journal : JOURNAL OF WATER AND CLIMATE CHANGE
  • Page Numbers: pp.360-372

Abstract

Flow hydrographs are one of the most important key elements for flood modelling. They are recorded as time series; however, they are not available in most developing countries due to lack of gauged stations. This study presents a flood modelling method for rivers having no upstream gauged stations. The modelling procedure involves three steps: (1) predicting upstream hydrograph by the reverse flood routing method which requires information about channel geometric characteristics, downstream flow stage and downstream flow hydrographs; (2) modelling flood wave spreading using HEC-RAS. The hydrograph predicted by the reverse flood routing in the first step becomes an inflow for the HEC-RAS model; (3) delineating the flood-risk areas by overlapping the Geographical Information System (GIS)-based flood maps produced by the HEC-RAS to the related orthophoto images. The developed model is applied to Guneysu Basin in Rize Province in Eastern Black Sea Region of Turkey. The model-produced flood map is compared to the observed one with success.