Parameter and rating curve uncertainty propagation analysis of the SWAT model for two small Mediterranean catchments [Analyse de la propagation des incertitudes de la courbe de tarage et des paramètres du modèle SWAT pour deux petits bassins versants de la région méditerranéenne]
Sellami H.,Catholic University of Louvain |
La Jeunesse I.,University of Tours |
Benabdallah S.,Center for Water Research and Technology |
Vanclooster M.,Catholic University of Louvain
Hydrological Sciences Journal | Year: 2013
The SWAT model was tested to simulate the streamflow of two small Mediterranean catchments (the Vène and the Pallas) in southern France. Model calibration and prediction uncertainty were assessed simultaneously by using three different techniques (SUFI-2, GLUE and ParaSol). Initially, a sensitivity analysis was conducted using the LH-OAT method. Subsequent sensitive parameter calibration and SWAT prediction uncertainty were analysed by considering, firstly, deterministic discharge data (assuming no uncertainty in discharge data) and secondly, uncertainty in discharge data through the development of a methodology that accounts explicitly for error in the rating curve (the stage-discharge relationship). To efficiently compare the different uncertainty methods and the effect of the uncertainty of the rating curve on model prediction uncertainty, common criteria were set for the likelihood function, the threshold value and the number of simulations. The results show that model prediction uncertainty is not only case-study specific, but also depends on the selected uncertainty analysis technique. It was also found that the 95% model prediction uncertainty interval is wider and more successful at encompassing the observations when uncertainty in the discharge data is considered explicitly. The latter source of uncertainty adds additional uncertainty to the total model prediction uncertainty. © 2013 IAHS Press.
Lamine M.,Center for Water Research and Technology |
Samaali D.,Center for Water Research and Technology |
Ghrabi A.,Center for Water Research and Technology
Desalination and Water Treatment | Year: 2012
This study examined the practical performance of a submerged membrane bioreactor treating low-load greywater. A 17 L laboratory-scale bioreactor with a flat-plate microfiltration membrane (polyethylene; pore size 0.4 μm) was operated to treat the effluent from the showers of the student housing complex at the Tunis Agriculture University (Tunisia). Permeate was intermittently withdrawn at constant transmembrane pressure induced by water level difference. The Pollutant removal and membrane behaviour were monitored. The treatment obtained a stable output with an excellent effluent quality in terms of chemical oxygen demand, suspended solids and anionic surfactant levels (20, <0.1 and 0.025 mg/L, respectively); in addition, faecal coliforms in the permeate were undetectable. The average power consumption by the experimental plant was 3.3 kWh per 1 m3 of treated water. © 2012 Desalination Publications. All rights reserved.