Abstract
Water resources management usually requires that hydraulic, ecological, and hydrological models be linked. The Hy- drologic Engineering Center River Analysis System (HEC-RAS) hydraulic model and the Hydrologic Engineering Center Geospatial River Analysis System (HEC-GEORAS), imitates flow and water profiles in the Neka river basin’s downstream flood plain. Hydrograph phases studied during the flood seasons of 1986-1999 and from 2002-2004 were used to calibrate and verify the hydraulic model respectively. Simulations of peak flood stages and hydrographs’ evaluations are congruent with studies and observations, with the former showing mean square errors between 4.8 - 10 cm. HECRAS calculations and forecast flood water levels. Nash-Sutcliffe effectiveness (CR3) is more than 0.92 along with elevated levels of water which were created with some effectiveness (CR5) of 0.94 for the validation period. The coupled two models show good performance in the water level modeling.
Highlights
Researchers have grouped the ways of model integration
The Neka river basin and the area of 10 km after the basin outlet in northern Iran is used for flood modelling by linking the HEC-GEORAS and Hydrologic Engineering Center River Analysis System (HEC-RAS) models
This study presented different methods for investigating model performance (Table 1), where is Yo observed water level, Ys simulated water level with linking HEC-RAS and HEC-GEORAS, N is total number of data SSE is sum square error SST is the sum square total n 1 is the total degrees of freedom, n k is the degrees of freedom for error MSM mean square model MSE mean square error
Summary
Researchers have grouped the ways of model integration. Morita [1] characterized coupling numerical models into full coupling (that is reformulation and solution of the governing equations completely), internal coupling (that is solutions for all models’ governing equations to be done individually and upgrading of the shared data using iteration), and external coupling (Running models separately and exchanging their results). Various coupled simulation programs are in use these days, for instance, coupling of surface flow models and groundwater or coupling of water quantity models and water quality. Coupling of HSPF (Hydrological Simulation Program-Fortran) model and UNET (one-dimensional unsteady flow through a full NET work of open channels) model was used by Lian et al [3], for enhancement in simulation of Illinois River basin, USA’s daily flows. The study points out that use of UNET model for large river’s flow routing system can result in great enhancements in the HSPF model’s accuracy as far as prediction of the flood peak is concerned. Various flood-forecasting systems make use of integrated hydraulic and hydrologic models.
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