...
Uit: Joe Speedboot (2005) van Tommy Wieringa.
...
1.2 Approval criterion for breach flow slide
The advanced model for breach flow slide is only valid for silt, sand and gravel. If thin clay, loam or peat layers are present (< 0.5 m) they can be neglected and regarded as sand layers with low permeability (d50 and d15). The user has to evaluate the soil layers for input in this sense. IN the case of thick clay layers the computation is only applied on the "sand clusters" in between the clay layers.
If the calculated "Decisive critical initialization height h_0" is higher than (or ( equal to) the usedthe user-defined "Expected maximum Maximum allowable initialization height h_expected " (h_0 >= , critical ≥ h_expectedallowable) the judgment is "disapprovedslope stability assessment is "approved" or "succeeded".
If h_0, critical < h_expectedallowable, the judgment assessment is "disapproved" approved" or "failed" which means that the probability that a breach flow slide will occur is high. The maximum allowable initialization height on a certain location is a measure for the probability of a relatively small slope disturbance that could occur and trigger a breach flow slide, f.i. failure of a thin clay layer, liquefaction of a loose sand layer, effect of waves or man induced activities such as dredging.