class SimpleRunoff

SimpleRunoff

terrainbento SimpleRunoff.

class SimpleRunoff(grid, runoff_proportion=1.0)

Bases: object

Generate runoff proportional to precipitation.

SimpleRunoff populates the field “water__unit_flux_in” with a value proportional to the “rainfall__flux”.

The “water__unit_flux_in” field is accumulated to create discharge.

Examples

>>> import numpy as np
>>> np.random.seed(42)
>>> from landlab import RasterModelGrid
>>> from terrainbento import RandomPrecipitator, SimpleRunoff
>>> grid = RasterModelGrid((5,5))
>>> precipitator = RandomPrecipitator(grid)
>>> runoff_generator = SimpleRunoff(grid, runoff_proportion=0.3)
>>> np.round(
...     grid.at_node["rainfall__flux"].reshape(grid.shape),
...     decimals=2)
array([[ 0.37,  0.95,  0.73,  0.6 ,  0.16],
       [ 0.16,  0.06,  0.87,  0.6 ,  0.71],
       [ 0.02,  0.97,  0.83,  0.21,  0.18],
       [ 0.18,  0.3 ,  0.52,  0.43,  0.29],
       [ 0.61,  0.14,  0.29,  0.37,  0.46]])
>>> np.round(
...     grid.at_node["water__unit_flux_in"].reshape(grid.shape),
...     decimals=2)
array([[ 0.11,  0.29,  0.22,  0.18,  0.05],
       [ 0.05,  0.02,  0.26,  0.18,  0.21],
       [ 0.01,  0.29,  0.25,  0.06,  0.05],
       [ 0.06,  0.09,  0.16,  0.13,  0.09],
       [ 0.18,  0.04,  0.09,  0.11,  0.14]])

__init__(grid, runoff_proportion=1.0)

Parameters

• grid (model grid) –

• runoff_proportion (float, optional.) – Proportion of “rainfall__flux” that is converted into runoff.

run_one_step(step)

Run SimpleRunoff forward by duration step