Although I’ve found a surprising number of landslide-bloggers (my favourite is Dave’s), google searches on the DAN-W and DAN3D software packages seem to drop people here. I’m fairly regularly getting comments asking how to go about modeling particular landslides, or acquire the software, or related queries. To speed up response time, I’ve developed an F.A.Q.
1. How can I get DAN-W or DAN3D?
DAN-W is owned by Oldrich Hungr. Please see his software website and contact him directly with any inquires about acquiring the software. DAN3D was developed by Scott McDougall as part of his phD thesis. To the best of my knowledge, it is for research purposes only and not currently available commercially, but again, Oldrich Hungr knows for sure.
2. What information do I need about a landslide to model its runout?
For DAN-W, you need a profile of the travel path (including entrainment zones) and the source area, and the width of the path. This can be either a list of coordinates or a to-scale sketch which you can enter directly into the software. For DAN3D, you need digital terrain models (topography) of the area before and after the landslide. You will need to format this as ASCII grid files of the path, the source area, and any entrainment.
3. What rheology should I use?
If you’re doing a back-analysis, you use whatever rheology and parameters provide the appropriate runout distance, debris distribution, and velocity profile. If you’re doing a forward prediction, you can follow the suggestions in my thesis), or back-analyze cases similar to your target and use that range of parameters in your prediction.
4. Tell me more about a particular landslide.
You can see if I wrote about in my thesis; Appendix E is entirely descriptions of case studies.
5. What about modeling this specific landslide not on your website?
If you’re working on modeling a landslide I haven’t seen before, I’m curious. Tell me about it!