HEC-HMS MODELING OF TALOMO RIVER BASIN USING SYNTHETIC APERTURE RADAR

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Year:
2016
Type of Publication:
In Proceedings
Keywords:
Synthetic Aperture Radar, River basin modeling, HEC-HMS Modeling, Automated Water Level Station , Rainfall Intensity-Duration Frequency
Authors:
James, Genelin Ruth P.; Acosta, Joseph E.; Agrazamendez, Maureen D.; Leon, Ryan Keath L. De; Hollite, Judy Rose D.; Logronio, Richard M.; Cando, Sharmayne C.
Abstract:
The best hydrological model is the one which gives results close to reality with the use of least parameters and model complexity. However, it is important to note that models are mainly used for predicting system behavior and understanding various hydrological processes. In this paper, the Talomo river basin model was generated using Synthetic Aperture Radar (SAR) data as input to HEC-HMS Model. The objective of this study is to generate a rainfall-runoff model of Talomo Watershed; specifically, this aims (i) to generate Talomo basin model using SAR; (ii) to calibrate the rainfall-runoff model; (iii) to compare observed flow against the outflow from the calibrated model; and (iv) to perform sensitivity analysis using Rainfall Intensity-Duration Frequency (RIDF). The result shows that the generated Talomo river basin HEC-HMS model consisted of 71 sub basins, 35 reaches, and 35 junctions. Adjusted values of model parameters such as initial abstraction, curve number, time of concentration, storage coefficient, recession constant, and ratio to peak were generated using the built-in search method of HEC-HMS. After comparing the observed and simulated flow values, the calibrated model attained good performance rating based on Root Mean Square Error (RMSE). The model also demonstrated change in the behavior of the runoff for 5, 25, and 100-year RIDF.
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