Nomenclature¶
Table: Nomenclature and definitions of symbols used in NAM model.
| A | contributing catchment area, (m2) |
| Atot | total catchment area (m2) |
| B | runoff width, (m) |
| I, S | surface slope, (-) |
| IE(t) | evaporation loss at time t, (ms-1) |
| IPE(t) | potential evaporation loss at time t, (ms-1) |
| II(t) | infiltration loss at time t, (ms-1) |
| IICUM(t) | cumulative infiltration loss at time tp, (m) |
| IS(t) | surface storage loss at time t, (m) |
| IH(t) | Horton's infiltration capacity at time t, (ms-1) |
| IW(t) | wetting loss at time t, (m) |
| IImax | maximum infiltration capacity, (ms-1) |
| IImin | minimum infiltration capacity, (ms-1) |
| I(t) | actual precipitation intensity at time t, (ms-1) |
| Ieff(t) | effective precipitation intensity at time t, (ms-1) |
| Ka, Kh | time factor (Horton's characteristic soil parameter) for wetting and drying conditions, respectively |
| M | Manning number, (m1/3s-1) |
| Q(t) | runoff, discharge, (m3s-1) |
| t | time, (s) |
| tc | concentration time, (s) |
| tp | equivalent time, for use with Horton´s equation (s) |
| \(\Delta t,d t\) | simulation time step, (s) |
| Y(t) | precipitation depth accumulated on the catchment surface at time t, (m), |
| yR(t) | runoff depth, i.e. precipitation depth accumulated on the catchment surface at time t, (m), reduced by wetting and surface storage depth (m) |
| yS | surface storage depth (m) |
| yW | wetting depth (m) |
| dyR | change in runoff depth, (m) |