Type of Document	Thesis
Author	Chang, Chi-Wen
Author's Email Address	cc06f@fsu.edu
URN	etd-04302009-155953
Title	Application of SCS CN method in HEC-HMS in ShihMen watershed - Simulation of Rainfall-Runoff Hydrologic model
Degree	Master of Science
Department	Civil and Environmental Engineering, Department of
Advisory Committee	Advisor Name Title Wenrui Huang Committee Chair Amy Chan Hilton Committee Member Bill X. Hu Outside Committee Member
Keywords	Rainfall-Runoff Storm Water ShihMen Watershed Hydrologic Modeling HEC-HMS GIS
Date of Defense	2009-01-05
Availability	unrestricted
Abstract A catchment is usually delineated as many sub-basins by using Geographical Information System (GIS) before HEC-HMS is applied. How many sub-basins should be delineated by the users is always a problem. If the range of sub-basins is too large, the spatial heterogeneity will be too difficult to recognize. On the other hand, it will be too complicated to process the spatial data for too many sub-basins. The purpose of this study is to apply cluster analysis for catchment delineation and to study whether the SCS curve number (SCS CN) method is appropriate for estimation of direct runoff in Taiwan. The DaHan Creek, a tributary of the DanShui River, is chosen for case study. In the cluster analysis, the values of curve number, surface slop, and the specified rain gages weighting for each sub-basin are used as variables. According to the discharge hydrograph of 3 selected rainfall events, the hydrologic parameter characteristics of the basin can be chosen by the trial and error process. The results show that CN value has correlated to hydro-geo factors and has positive correlation with peak flow.
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