**Acknowledgements**

The authors are grateful for the support of this research by the National Science and Technology Major Project (2011ZX06901-003). One of the authors (T. Hibiki) appreciates the support through the Global STEM Professorship from Hong Kong government.

*DEFEM Method and Its Application in Pebble Flows DOI: http://dx.doi.org/10.5772/intechopen.109347*
