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Applicability of Rainfall–Runoff Models in Two Simplified Watersheds
https://orcid.org/http://orcid.org/0000-0003-2846-2840
Ideal watersheds of simple geometries, characterized by dominant processes involved in rainfall–runoff transformation, can provide model users/developers with detailed insights into hydrological components. In the present paper, some models were evaluated against available laboratory data on impervious rectangular and V-shaped (open-book) watersheds. The HEC-HMS as a numerical hydrologic model was adopted along with analytical solution of the kinematic wave approximation. The numerical methods used in HEC-HMS model involve finite difference method. Simulations were performed for various cases formed through variation of watershed slope and rainfall intensity. The outputs of the models involved runoff hydrographs, time to peak discharge and maximum discharge. For the rectangular watershed, numerical solution of KW within HEC-HMS was applied while for the V-shaped case, the numerical solution of KW in HEC-HMS and DWSM models and nonlinear reservoir scheme in SWMM model were compared. According to the results, in the rectangular watershed case, numerical model of KW within HEC-HMS showed good performance with relative accuracy of 69.2% and 96.0% in estimation of time to peak discharge and maximum discharge, respectively. In the case of V-shaped watershed, all rainfall–runoff models provided satisfactory results so that the nonlinear reservoir scheme in SWMM model outperformed the KW model. Moreover, regarding the kinematic wave solution schemes, finite difference (KW in HEC-HMS) and shock fitting (KW in DWSM) were shown to be similar in efficiency with the Nash–Sutcliffe efficiency index of 0.94.
Applicability of Rainfall–Runoff Models in Two Simplified Watersheds
https://orcid.org/http://orcid.org/0000-0003-2846-2840
Ideal watersheds of simple geometries, characterized by dominant processes involved in rainfall–runoff transformation, can provide model users/developers with detailed insights into hydrological components. In the present paper, some models were evaluated against available laboratory data on impervious rectangular and V-shaped (open-book) watersheds. The HEC-HMS as a numerical hydrologic model was adopted along with analytical solution of the kinematic wave approximation. The numerical methods used in HEC-HMS model involve finite difference method. Simulations were performed for various cases formed through variation of watershed slope and rainfall intensity. The outputs of the models involved runoff hydrographs, time to peak discharge and maximum discharge. For the rectangular watershed, numerical solution of KW within HEC-HMS was applied while for the V-shaped case, the numerical solution of KW in HEC-HMS and DWSM models and nonlinear reservoir scheme in SWMM model were compared. According to the results, in the rectangular watershed case, numerical model of KW within HEC-HMS showed good performance with relative accuracy of 69.2% and 96.0% in estimation of time to peak discharge and maximum discharge, respectively. In the case of V-shaped watershed, all rainfall–runoff models provided satisfactory results so that the nonlinear reservoir scheme in SWMM model outperformed the KW model. Moreover, regarding the kinematic wave solution schemes, finite difference (KW in HEC-HMS) and shock fitting (KW in DWSM) were shown to be similar in efficiency with the Nash–Sutcliffe efficiency index of 0.94.
Applicability of Rainfall–Runoff Models in Two Simplified Watersheds
https://orcid.org/http://orcid.org/0000-0003-2846-2840
Ideal watersheds of simple geometries, characterized by dominant processes involved in rainfall–runoff transformation, can provide model users/developers with detailed insights into hydrological components. In the present paper, some models were evaluated against available laboratory data on impervious rectangular and V-shaped (open-book) watersheds. The HEC-HMS as a numerical hydrologic model was adopted along with analytical solution of the kinematic wave approximation. The numerical methods used in HEC-HMS model involve finite difference method. Simulations were performed for various cases formed through variation of watershed slope and rainfall intensity. The outputs of the models involved runoff hydrographs, time to peak discharge and maximum discharge. For the rectangular watershed, numerical solution of KW within HEC-HMS was applied while for the V-shaped case, the numerical solution of KW in HEC-HMS and DWSM models and nonlinear reservoir scheme in SWMM model were compared. According to the results, in the rectangular watershed case, numerical model of KW within HEC-HMS showed good performance with relative accuracy of 69.2% and 96.0% in estimation of time to peak discharge and maximum discharge, respectively. In the case of V-shaped watershed, all rainfall–runoff models provided satisfactory results so that the nonlinear reservoir scheme in SWMM model outperformed the KW model. Moreover, regarding the kinematic wave solution schemes, finite difference (KW in HEC-HMS) and shock fitting (KW in DWSM) were shown to be similar in efficiency with the Nash–Sutcliffe efficiency index of 0.94.
Applicability of Rainfall–Runoff Models in Two Simplified Watersheds
Iran J Sci Technol Trans Civ Eng
Mohammadi Hashemi, Mohammad (author) / Saghafian, Bahram (author) / Zakeri Niri, Mahmoud (author) / Najarchi, Mohsen (author)
2022-08-01
12 pages
Article (Journal)
Electronic Resource
English
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