Investigation of rainfall-runoff relationship in Bang Pa Kong river basin by RIBAMAN (RBM-DOGGS) model
1995
Awirut Suksomarth
RIBAMAN (RBM-DOGGS) model is a mathematical model for analysis and design of surface runoff from observed or designed rainfall. The model referes to SCS method which requires land use and soil type data in basin. This model comprises of parameters that are varied by region and topography. To derive an appropriate approach for generating each parameter at Eastern of Thailand, concerning data obtained from 7 stream gaging stations of Bang Pa Kong River Basin were investigated. In 6 stations have catchment area less than 1,000 square km, the other has larger than 1,000 square km. Three case studies which depended on anticident moisture content of each catchment area were evaluated. The result of analysis showed that the defined parameter, namely runoff curve number (CN) and initial abstraction (Ia) for rural area (CN1, Ia1) and urban area (CN2, Ia2), can be summarized as follows : 1. Drought CN1=25-35, CN2=57-85, Ia1=70-100 millimeters, Ia2=8-31 millimeters 2. Intermediate CN1=32-53, CN2=71-90, Ia1=36-96 millimeters, Ia2=3-16 millimeters 3. Saturation CN1=47-73, CN2=86-96, Ia1=17-51 millimeters, Ia2=3-7 millimeters. It also found that the model can appropriately represent between rainfall and runoff. The correlation factors between calculated and observed values of runoff rate, peak discharge and time to peak of all selected hydrographs are 0.825 to 0.994, 0.960 to 0.995 and 0.868 to 0.997 respectively. To use this model for the others studies, an user manual was also prepared.
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