University of Twente Student Theses


GIUH model approach for the ungauged Achumani catchment using GIS techniques. A case study in La Paz, Bolivia

Airthon Angel, Espejo Rospigliossi (2009) GIUH model approach for the ungauged Achumani catchment using GIS techniques. A case study in La Paz, Bolivia.

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Abstract:The main objective of this thesis is to develop the GIUH to assess its performance for the Achumani catchment (La Paz, Bolivia). Three major stages were defined in order to develop the input data for the GIUH modelling process. The first stage consists in the data collection during the field work period. All the basic and only information for the Achumani catchment was collected (pluviographic, pluviometric and discharge data). Additionally, field survey was made for GCP collection for the drainage definition and topographic survey for calibration purposes. The second stage includes the hydrology analysis to the pluviographic and pluviometric data in order to define a specific rainfall event to be modelled. The frequency analysis was also developed to define design hyetographs for 50 and 100 years return period based on intensities for different duration and return periods. Three infiltration methods were considered to assess its effect on the total precipitation. The third stage consists in the DEM processing using three different DEM sources. This stage defines the catchment geomorphological parameters, the Strahler’s stream ordering map and the Horton’s statistics parameters. These three stages become the basic input for the GIUH modelling. The GIUH showed a reasonable model efficiency of 67% and its instantaneous unit hydrograph from this simulation was used to estimate the design discharge values for 50 and 100 years return period. These discharge values become a good reference for hydraulic structures design projects especially those developed at the bottom part of the catchment, where the urban area is located. The variation among the Horton’s statistics values estimated for every DEM source did not affect significantly the peak values of the unit hydrograph. This performance suggests that the use of a free access satellite imagery source such as the SRTM can perform successfully and efficiently with the GIUH model. Keywords: SRTM, GIUH, Frequency analysis, DEM hydro-processing
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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