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- Title
Centrifuge and numerical modeling of the impact of sediment consolidation induced by capping on contaminant transportation.
- Authors
Zheng, Jian; Li, Yu-Chao; Ke, Han; Chen, Yun-Min
- Abstract
In situ capping is commonly used to minimize the impact of contaminated sediments on the surrounding aquatic environment. Most present guidelines on the design of in situ capping only consider the transport of contaminants from the sediment into the overlying water caused by diffusion. The influence of the consolidation on the movement of dissolved contaminants has not been fully understood in the design of in situ capping. Moreover, the thickness of cap should be properly designed as it can not only retain the migrated contaminants but also induce consolidation and accelerate the contaminant transport. The influence of the cap thickness on its efficiency has never been investigated before. In this paper, centrifuge tests were conducted to investigate the impact of consolidation induced by capping on contaminants migration through capping layers prepared with different thicknesses. Numerical model was also developed to simulate the centrifuge tests using COMSOL that coupled the consolidation and contaminant transport. Good agreements were obtained between the centrifuge and numerical results. Both of them show that the consolidation can significantly accelerate the contaminant breakthrough of the cap and increase the contaminants moved into the overlying water. Increasing the cap thickness can lead to lager settlement but less contaminants moved into the overlying water as the cap has effect to retain the moved contaminants. Compared to the breakthrough considering only diffusion, consolidation can accelerate the breakthrough times of up to 209 times. Therefore, the influence of consolidation induced by capping has to be considered in the design of in-situ capping.
- Publication
Bulletin of Engineering Geology & the Environment, 2022, Vol 81, Issue 11, p1
- ISSN
1435-9529
- Publication type
Article
- DOI
10.1007/s10064-022-02986-4