MARRMOT_02
Implementation
MARRMoT v2.1.1 rev eeb7e15 m_02_wetland_4p_1s; standardized continuous structure, not original model
Time step: daily
Backend: octave-cli + Octave optim
Calibrated parameters: 4
Temperature required: no
Parameters and initial configuration
Parameter |
Supported calibration range |
Default |
|---|---|---|
|
0 to 5 |
2.5 |
|
0 to 10 |
5.0 |
|
1 to 2000 |
1000.5 |
|
0 to 1 |
0.5 |
|
Fixed initial/configuration value |
0.0 |
Ranges/defaults are implementation contracts, not universal priors or a recommended basin calibration. Consult source comments for parameter units and coupling.
Governing equations
The following source is the exact model kernel used by this adapter. For MARRMoT it includes the state derivative and each referenced flux function; the solver and routing are described above. Original notices and source citations are retained in the files.
function [dS, fluxes] = model_fun(obj, S)
% parameters
theta = obj.theta;
dw = theta(1); % Daily interception [mm]
betaw = theta(2); % Soil moisture storage distribution parameter [-]
swmax = theta(3); % Maximum soil moisture storage [mm],
kw = theta(4); % Runoff coefficient [d-1]
% delta_t
delta_t = obj.delta_t;
% stores
S1 = S(1);
% climate input
t = obj.t; % this time step
climate_in = obj.input_climate(t,:); % climate at this step
P = climate_in(1);
Ep = climate_in(2);
T = climate_in(3);
% fluxes functions
flux_pe = interception_2(P,dw);
flux_ei = P - flux_pe;
flux_ew = evap_1(S1,Ep,delta_t);
flux_qwsof = saturation_2(S1,swmax,betaw,flux_pe);
flux_qwgw = baseflow_1(kw,S1);
% stores ODEs
dS1 = flux_pe - flux_ew - flux_qwsof - flux_qwgw;
% outputs
dS = [dS1];
fluxes = [flux_pe, flux_ei, flux_ew, flux_qwsof, flux_qwgw];
end
% STEP runs at the end of every timestep
function [out] = interception_2(In,p1)
%interception_2
% Copyright (C) 2019, 2021 Wouter J.M. Knoben, Luca Trotter
% This file is part of the Modular Assessment of Rainfall-Runoff Models
% Toolbox (MARRMoT).
% MARRMoT is a free software (GNU GPL v3) and distributed WITHOUT ANY
% WARRANTY. See <https://www.gnu.org/licenses/> for details.
% Flux function
% ------------------
% Description: Interception excess after a constant amount is intercepted
% Constraints: f >= 0
% @(Inputs): In - incoming flux [mm/d]
% p1 - interception and evaporation capacity [mm/d]
out = max(In-p1,0);
end
function [out] = evap_1(S,Ep,dt)
%evap_1
% Copyright (C) 2019, 2021 Wouter J.M. Knoben, Luca Trotter
% This file is part of the Modular Assessment of Rainfall-Runoff Models
% Toolbox (MARRMoT).
% MARRMoT is a free software (GNU GPL v3) and distributed WITHOUT ANY
% WARRANTY. See <https://www.gnu.org/licenses/> for details.
% Flux function
% ------------------
% Description: Evaporation at the potential rate
% Constraints: f <= S/dt
% @(Inputs): S - current storage [mm]
% Ep - potential evaporation rate [mm/d]
% dt - time step size
out = min(S/dt,Ep);
end
function [out] = saturation_2(S,Smax,p1,In)
%saturation_2
% Copyright (C) 2019, 2021 Wouter J.M. Knoben, Luca Trotter
% This file is part of the Modular Assessment of Rainfall-Runoff Models
% Toolbox (MARRMoT).
% MARRMoT is a free software (GNU GPL v3) and distributed WITHOUT ANY
% WARRANTY. See <https://www.gnu.org/licenses/> for details.
% Flux function
% ------------------
% Description: Saturation excess from a store with different degrees of saturation
% Constraints: 1-S/Smax >= 0 prevents numerical issues with complex
% numbers
% @(Inputs): S - current storage [mm]
% Smax - maximum contributing storage [mm]
% p1 - non-linear scaling parameter [-]
% In - incoming flux [mm/d]
% NOTE: When stores are very slightly below or over their maximum, the
% exponent can push this function into regions where no feasible solutions
% exist. The min(max()) combination prevents this from happening.
out = (1- min(1,max(0,(1-S./Smax))).^p1) .*In;
end
function [out] = baseflow_1(p1,S)
% baseflow_1
% Copyright (C) 2019, 2021 Wouter J.M. Knoben, Luca Trotter
% This file is part of the Modular Assessment of Rainfall-Runoff Models
% Toolbox (MARRMoT).
% MARRMoT is a free software (GNU GPL v3) and distributed WITHOUT ANY
% WARRANTY. See <https://www.gnu.org/licenses/> for details.
% Flux function
% ------------------
% Description: Outflow from a linear reservoir
% Constraints: -
% @(Inputs): p1 - time scale parameter [d-1]
% S - current storage [mm]
out = p1.*S;
end
Note
This standardized MARRMoT structure is not identical to the original named model. p01... follow exact source order; s01... are fixed initial stores, defaulting to zero. Octave + optim are required. Solver behavior can differ across runtime versions.
Simulation
from basinforge import Basin, get_model
basin = Basin.from_csv("basin.csv", basin_id="A", area_km2=1200,
q_unit="m3/s", timestep="daily")
q_mm = get_model("MARRMOT_02").simulate(basin)
q_m3s = basin.to_m3s(q_mm)
Supply your actual data and catchment area; temperature-dependent models require a temperature column. For non-daily models, choose an appropriate warmup in model steps.
See calibration, input requirements, sources and verification limitations.