Prediction of the water balance of two soil cover systems |
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| Authors: | Celestina Adu-Wusu Ernest K Yanful Lisa Lanteigne Mike O’Kane |
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| Institution: | (1) Civil and Environmental Engineering, University of Western Ontario, London, ON, Canada, N6A 5B9;(2) Ontario Division, Inco Limited, Sudbury, ON, Canada;(3) O’Kane Consultants Inc., Saskatoon, SK, Canada;(4) Amec Earth and Environmental, 221-18th Street S.E., Calgary, AB, Canada, T2E 6J5 |
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| Abstract: | Soil cover systems are widely used for containment of municipal solid waste, hazardous and mine waste, with the objective
of limiting the ingress of precipitation and oxygen. The ability to predict their long-term performance is crucial, as their
failure would result in the release of contaminants to the environment. However, monitoring covers over the long term to derive
the information needed to aid in design is impractical and there are no large-scale covers that have been in use for a long
enough period to generate the data needed. Numerical models have been particularly useful as design tools. To improve their
reliability these models may be calibrated to field data and then used to make long-term predictions of cover performance.
The field performance of two resistive test soil covers on a 20% sloping waste rock platform is predicted using the two-dimensional
soil–atmosphere model Vadose/W. Input data for the model included soil, climate and vegetation data obtained either in the
field or laboratory. Model results were compared to field data to assess the validity of the program. The model reasonably
simulated field response patterns for soil water storage and suction. Divergence between field performance data and model
predictions were significantly influenced by snowmelt, interflow and flow through preferential pathways. |
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| Keywords: | Field performance monitoring Field response modeling Geosynthetic clay liner Waste containment Water balance Soil covers Soil water characteristic curve 2-D numerical modeling |
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