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Bioengineering for bank stabilization means incorporating living and dead trees into the materials used to build up eroded riverbanks as opposed to riprap, which is rocks. It's not just boulders, true riprap rock has a certain specific gravity and is quarried to have angles so it has more of a grip when pummeled by floodwater. But bioengineering is more resilient, and better for the riparian ecosystem.
The following links/documents will provide more information about bioengineering for bank stabilization (large files may take several moments to load, please be patient):