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Simulations of storm hydrographs in a mixed-landuse watershed using a modified TR-20 model

Authors
Journal
Agricultural Water Management
0378-3774
Publisher
Elsevier
Publication Date
Volume
97
Issue
2
Identifiers
DOI: 10.1016/j.agwat.2009.09.004
Keywords
  • Paddy Field
  • Rainfall–Runoff
  • Event-Based
  • Peak Discharge
  • Tr-20-Rice
Disciplines
  • Earth Science
  • Geography

Abstract

Abstract Most flood damage in Korea is caused by heavy rainfall events and typhoons during the summer rainy season. A modified Natural Resources Conservation Service (NRCS) TR-20 model, TR-20-RICE, was developed to investigate the storm runoff characteristics of a 385-ha mixed-landuse watershed in Korea. The TR-20-RICE not only used the rainfall excess and hydrologic flood routing components of the original TR-20 model, but also included a paddy runoff process, which captured irrigated paddy runoff characteristics such as inundation, retention storage, and surface runoff. The performances of TR-20 and TR-20-RICE were compared using storm hydrographs and observational data. The results indicated that both models simulated storm runoff accurately over the simulation period. The TR-20-RICE runoff volume, peak discharge, and time-to-peak predictions were slightly closer to observations than those of the TR-20. The TR-20-RICE model may an effective alternative to the TR-20 model for generating storm hydrographs, particularly in the mixed-landuse watershed in Korea.

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