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Applicability of Rainfall–Runoff Models in Two Simplified Watersheds

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Iranian Journal of Science and Technology, Transactions of Civil Engineering Aims and scope Submit manuscript

Abstract

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.

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Abbreviations

A :

Cross-sectional area (L2)

A x :

Rectangular area of cross section (L2)

d :

Depth of excess ponds atop the sub-watershed surface (L)

d s :

Depth of ponded water above the depression stage

e :

Surface evaporation rate (L/T)

f :

Infiltration rate (L/T)

h :

Height of flow (L)

h L :

Height of flow at a specific distance (L)

i R :

Rainfall intensity (L/T)

\({i}_{r+s}\) :

Sum of intensity of rainfall and snowmelt (L/T)

j :

Integer for time increment (T)

L ov :

Length of overland plane (L)

n :

Manning’s roughness coefficient

E :

Nash–Sutcliffe efficiency

q :

Flow per unit width of watershed (L3/T/L)

q L :

Lateral inflow per unit width of watershed (L3/T/L)

q j :

Discrete q along the x-axis (L3/T/L)

Q :

Outlet discharge (L3/T)

Q e :

Equilibrium discharge (L3/T)

Q o :

Average observed runoff over the entire experiment at a fixed time step Δt (L3/T))

Q oi :

Observed runoff at time ti (L3/T)

Q si :

Simulated runoff at time ti (L3/T)

R x :

Hydraulic radius associated with watershed area and (L)

S :

Average slope of the sub-watershed(L/L)

s ov :

Bed slope (L/L)

t :

Time (T)

t b :

Hydrograph base time (T)

t eo :

Equilibrium time (T)

t p :

Maximum of observed discharges time (T)

W :

Channel width (L)

x :

Distance along the flow point (L)

α :

Kinewater wave parameter

β :

Kinewater wave parameter

\(\frac{\partial A}{{\partial t}}\) :

Difference in area in successive times

\(\frac{\partial A}{{\partial x}}\) :

Difference in area at adjacent locations

Δt :

Time step (T)

Δx:

Space step (L)

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Acknowledgements

Thanks are due to Dr. Charles Melching for providing Illinois laboratory watersheds data, and to anonymous reviewers for their helpful comments.

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Correspondence to Bahram Saghafian.

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Mohammadi Hashemi, M., Saghafian, B., Zakeri Niri, M. et al. Applicability of Rainfall–Runoff Models in Two Simplified Watersheds. Iran J Sci Technol Trans Civ Eng 46, 3295–3306 (2022). https://doi.org/10.1007/s40996-021-00733-5

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