I have set up a simple tidal breach model using vzshp but am unable to get a breach to start.
Basically, I've defined a vzshp over a defence to start a breach (invert=2mAOD) from time 0 hr and close after 72 hours, with a HT tidal boundary applied behind the defence (tide levels are greater than 2mAOD).
I've also tried it with a trigger point behind the defence at the level the breach should occur (4mAOD) but it still won't open.
Does anyone see what's wrong here? (green - HT tidal boundary, blue - vzshp breach, grid size 10m)
Many thanks.