SETRIC, a Mathematical Model for Sediment Transport in Irrigation Canals - Sediment Transport in Irrigation Canals: A New Approach - page 177

river model (DHL, 1994) for the sediment transport simulations
showed fairly good proximity between the predicted values of SETRIC
and DUFLOW and the SOBEK river model.
- model verification : the hydraulic and sediment transport predictions of
the model are comparable with other models that are being used for
research and design. The model predictions are in line with the natural
process of morphological changes due to the change in water flows and
sediment loads;
- model validation : the model has been validated using measured field
data as input variables and comparing the predicted morphological
changes with measured values. The predictions of the model have been
found to be in line with the observed deposition patterns in an irrigation
canal;
- application to field data : for the simulation of the sediment process
the model has used as input variable measured data from a secondary
irrigation canal, namely measured water flow, sediment concentration
and water delivery schedules of two irrigation seasons. The deposition
values predicted by the model ranged between 52% and 68% of the
measured quantity during the two seasons;
- general use of the model : the model can predict the sediment transport
behaviour of an irrigation canal for specific water requirements and
delivery schedules. The model predicts the amount of sediment that
will be deposited or eroded and determines the required capacity or
efficiency of the sediment removal facilities and how they should be
operated. The model can also assist in the selection of an improved
operation plan that will result in minimal deposition in the canal systems
that have been designed without considering any sediment transport
criterion;
- downstream control : the SETRIC model has been applied to an
automatically downstream controlled irrigation canal in Pakistan to
investigate the sediment transport and to verify the model's applica-
tion for downstream-controlled irrigation canals (Munir, 2011). Four
different flow conditions (design flow, existing flow, and 50% of the
design flow and canal operations under Crop Based Irrigation Oper-
ations (CBIO)) have been analysed for the hydraulic and sediment
transport simulations in two irrigation schemes in Pakistan. The model
was calibrated with field measurements in terms of canal roughness and
the canal roughness was adapted to meet the measured and simulated
water levels and for the sediment transport calibration from the sim-
ulations followed a multiplication factor for the equilibrium sediment
transport formula for the specific conditions in Pakistan;
- simulation of the sediment transport for downstreamcontrol : along with
the hydraulic computations the model proved to be able to simulate
the sediment transport in downstream-controlled canals. The sedi-
ment transport has been simulated for several canal operation scenarios