University of Twente Student Theses


Runoff modelling of the Upper Cabra river basin Panama

Goez, Harold Hoyos (2011) Runoff modelling of the Upper Cabra river basin Panama.

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Abstract:Estimation of the surface runoff in the catchment is important for the urban planning and the design of flood control structures. Monitoring and estimation of peak discharge is the main objective in water resources planning and management and can be achieved by surface runoff modelling. Even though a variety of rainfall-runoff models are available, a selection of a suitable rainfall-runoff model for a given catchment is essential to ensure efficient planning and management of catchments. The objective of this study is to simulate the rainfall runoff in Cabra river basin using hydrological models. HBV-96 semi distributed and HEC-HMS lumped models are selected for this research. To meet the objective of the study, geographical information systems and remote sensing information were used. The data sets of this study were collected in Cabra catchment Rainfall, stage, temperature, Digital elevation model (DEM) were collected. Rainfall and tests were carried out to filter wrong information. Stage data is corrected and converted into discharges according to rainfall. Correction of discharges was attempted. Data screening is performed to the rainfall and discharge time series. Rainfall and runoff time series quality is very poor. The aerial rainfall is calculated using Thiessen polygon and the potential evapotranspiration is calculated using Thornthwaite method following the local standards. Land cover of the study area was classified using supervised classification of Landsat TM images; the DEM is processed using ArcGIS tools. The hourly runoff is simulated for Cabra river basin using HBV-96 and HEC-HMS. The model HBV-96 is calibrated using manual calibration the performance of the calibration is measured by Relative volume error (RVE) and Nash and Sutcliffe (NS), the performance is acceptable. The model HEC-HMS is calibrated by trial and error and by optimization trials, the performance of the calibration is measured by RVE and NS. In the outcome the performance of the model was very poor, and the probable cause of the failure to simulate the relation of the rainfall and runoff is the observed data taken at a daily time step much longer than the response of the catchment, and simulated data is hourly time step besides the low quality of the rainfall and runoff time series
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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