Keywords
watershed, modeling, runoff, WMS, GIS
Location
Colorado State University
Start Date
26-6-2018 5:00 PM
End Date
26-6-2018 7:00 PM
Abstract
The study attempts to predict the annual water volume in the ungauged wadi Bougous where a reservoir is constructed at its outlet. The Mellah watershed, which is equipped with a gauging station, is used as a basin of reference to validate the rainfall-discharge model from the Watershed Modeling System (WMS). The ungauged Bougous basin is used to estimate the out-flow, where a non calibrated model is introducted. The idea is to achieve an association of the layers of land use and type of soils, using GIS software, and the physical elements of the catchment, determined from the Digital Elevation Model (DEM). To compute the out-flow, some stream flow and rainfall events have been introduced in the model for simulation. The application of the WMS model and the method of the curve number have provided satisfactory results. The calculated mean annual volume (period 1975/76-1998/99) in the wadi Mellah is estimated to be 104.24 Hm3 and the predicted mean annual volume with WMS model is found equal to 100.18 Hm3, accounting for an underestimation of only 3.89%. For the period 1975/76-2000/01, the mean annual volume in wadi Bougous is equal to 37.29 Hm3, with a mean annual runoff of154.14 mm. However, the volume estimated from the A.N.HYD (1997) study has revealed an overestimation of 46% in comparison with the simulated model. The synthetic determination of CN generated from the remote sensing and GIS is a meaningful tool that can conduct to a satisfactory modelling of the out-flows in ungauged basins.
Modelling Water Volume for El Kebir Watershed
Colorado State University
The study attempts to predict the annual water volume in the ungauged wadi Bougous where a reservoir is constructed at its outlet. The Mellah watershed, which is equipped with a gauging station, is used as a basin of reference to validate the rainfall-discharge model from the Watershed Modeling System (WMS). The ungauged Bougous basin is used to estimate the out-flow, where a non calibrated model is introducted. The idea is to achieve an association of the layers of land use and type of soils, using GIS software, and the physical elements of the catchment, determined from the Digital Elevation Model (DEM). To compute the out-flow, some stream flow and rainfall events have been introduced in the model for simulation. The application of the WMS model and the method of the curve number have provided satisfactory results. The calculated mean annual volume (period 1975/76-1998/99) in the wadi Mellah is estimated to be 104.24 Hm3 and the predicted mean annual volume with WMS model is found equal to 100.18 Hm3, accounting for an underestimation of only 3.89%. For the period 1975/76-2000/01, the mean annual volume in wadi Bougous is equal to 37.29 Hm3, with a mean annual runoff of154.14 mm. However, the volume estimated from the A.N.HYD (1997) study has revealed an overestimation of 46% in comparison with the simulated model. The synthetic determination of CN generated from the remote sensing and GIS is a meaningful tool that can conduct to a satisfactory modelling of the out-flows in ungauged basins.
Stream and Session
Stream A: Advanced Methods and Approaches in Environmental Computing.
A101: Modelling Uncertainty in Geographic Information Analysis