Skip to main content
Open Access Publications from the University of California

Effects of woody vegetation on levee integrity during full scale testing at twitchell island in Rio Vista, California

  • Author(s): Shriro, M
  • Cobos-Roa, D
  • Bray, J
  • Sitar, N
  • et al.

A full scale levee infiltration experiment investigates the effects of woody vegetation on levee integrity within the San Joaquin Delta in California. An 8 foot deep crown trench was excavated through the levee at a control segment and through root systems of landside and waterside oak trees. The crown trench was flooded to simulate a flood condition while instruments tracked the response. Burrow networks, stratigraphy, fracturing, and voids added complexity. Cracks and deformations were monitored throughout the test. A leaning waterside oak tree fell during testing. Computer simulations captured the observed landside and waterside tree responses. The impact of a tree on seepage-induced stability is explored through mass averaged limit equilibrium analyses, incorporating tree loading distributed across a root plate zone defined by pit sizes from empirical windthrow data. Global seepage-induced stability does not appear to be largely impacted by the presence of a tree.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View