Setting Boundary Conditions: interior rectangle¶

This tutorial illustrates how to modify the boundary conditions of an interior rectangle in the grid if you know the x and y coordinates of the rectangle.

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import numpy as np

from landlab import RasterModelGrid

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mg = RasterModelGrid((10, 10))

Known coordinates of rectangle:

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min_x = 2.5
max_x = 5.0
min_y = 3.5
max_y = 7.5

Define the area inside x and y coordinates:

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x_condition = np.logical_and(mg.x_of_node < max_x, mg.x_of_node > min_x)
y_condition = np.logical_and(mg.y_of_node < max_y, mg.y_of_node > min_y)
my_nodes = np.logical_and(x_condition, y_condition)

Define boundaries as CLOSED:

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mg.status_at_node[my_nodes] = mg.BC_NODE_IS_CLOSED

Make a new elevation field for display:

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z = mg.add_zeros("topographic__elevation", at="node")

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mg.imshow(z, at="node")

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