Abstract I
Acknowledgements II
Table of Contents III
List of Tables V
List of Figures IX
Chapter 1 Introduction 1
1.1 Background 1
1.2 Problem statements 4
1.3 Objectives of thesis 4
1.4 Thesis overviews 5
Chapter 2 Literature Review 8
2.1 Hydrological modeling 8
2.2 Review of HEC-HMS hydrological model applications 10
2.3 Improvement of HEC-HMS model 14
2.4 Previous studies in the area 18
2.4.1 Rainfall-runoff models used for flood simulation in Vietnam 18
2.4.2 Studies flood simulation and flood forecasting in Nong Son watershed 20
Chapter 3 HEC-HMS Modeling 22
3.1 HEC-HMS modeling 22
3.2 Hydrological modeling 23
3.2.1 Basin model 23
3.2.2 Meteorological model 28
3.2.3 Model parameter calibration and validation 29
3.2.4 Calibration and validation performance 31
Chapter 4 Study Area and Application HEC-HMS for Nong Son Watershed 32
4.1 Description of study area 32
4.1.1 Location and topography 32
4.1.2 Hydro-meteorological features 33
4.2 Data collection 35
4.2.1 Basin characteristics 35
4.2.2 Rainfall and runoff data 36
4.3 Procedure application of HEC-HMS model for NongSon watershed 37
4.3.1 Setting up of the model 38
4.3.2 Application HEC-HMS model for flood simulation in Nong Son watershed 42
Chapter 5 Analyis and Results 44
5.1 Identification the number of subbasin 44
5.2 Identification combinations of loss models and transform models 53
5.3 Identification the sensitive model parameters 57
5.3.1 Parameters affect on peak discharge 58
5.3.2 Parameters affect on runoff volume 60
5.3.3 Parameters affect on time to peak discharge 61
5.4 Calibration results 63
5.5 Validation results 73
Chapter 6 Conclusions and Recommendations 79
6.1 Conclusions 79
6.2 Recommendations 83
References 85
Appendices 90
Appendix A Model cofiguration analysis 90
Appendix B Combination Loss model and Transform model 119
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