Environmental Engineering Reference
In-Depth Information
Figure 16.30.
Efficiency of geomembrane (GM) + GCL + attenuated layer (AL) barrier
systems versus the number of wrinkles (with holes) in the GM [MAN 00]
It is still worth pointing out the possibility of using this simplified procedure to
describe the trend of geomembrane degradation effects once some relationships
between wrinkles with holes or cracking and elapsing time are available through
field observations or other experimental data.
16.9. Conclusions
The main factors influencing landfill bottom barrier performance have been
discussed and the fundamental principles, based on the present state of knowledge,
for their design have been introduced and analyzed. The main conclusions that can
be drawn are as follows:
− Hydraulic conductivity and chemical compatibility of simple CCLs are the
most important characteristics for the medium-term efficiency of pollutant
containment systems.
− The contribution of the geomembrane is significant for: decreasing the overall
hydraulic conductivity of composite barriers; limiting the diffusive transport of some
