It is a nodal property, but because surface loading is applied to all nodes of a vertical column of nodes, only one node of the column needs to be chosen.

Specified stress variation

1. npanel Number of panels in the time-variable specified stress function. For each panel, enter the following:
(a) ton_val, bc_val Time on [T] and specified stress variation [L T−1].

Chosen nodes in the currently active media (see Section 5.8.1) are assigned a time-variable specified stress variation value. The specified stress variation value corresponds to the term:

${\displaystyle {\frac {{\partial }({\sigma }_{zz}/{\rho }g)}{{\partial }t}}}$                          (Equation 5.10)

which has units of [L T−1] and corresponds to an equivalent freshwater head change per unit time.

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Specified stress variation from file

1. fname Name of the file which contains the list of nodes to which specified stress variation will be assigned. It should contain the following data for each node:
2. nde, npanel Node number, number of panels
(a) ton_val, bc_val Time on [T], stress variation [L T−1].

Nodes listed in the file and in the currently active media (see Section 5.8.1) are assigned a unique stress variation value. The specified stress variation value is described in the previous command.

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