Hydraulic performance assessment of a multi-layered landfill cover system under constant water ponding
Hydraulic performance assessment of a multi-layered landfill cover system under constant water ponding
PDFAuthors: Janarul Shaikh, Sudheer Kumar Yamsani, Sanjeet Sahoo, Sreedeep Sekharan and Ravi Ranjan Rakesh
Volume/Issue: Volume 25: Issue 2
Published online: 01 Nov 2022
Pages: 129 - 140
Abstract
The engineered multi-layered cover system (MLCS) is used to minimize rainwater infi ltration into the wastes accommodated in near surface waste disposal facility (NSDF). It is important to assess the hydraulic performance of MLCS before deploying it in the fi eld. For this purpose, an instrumented three-layered soil column representing MLCS was subjected to 1.5 m constant ponding head for 400 days. The variation of volumetric water content and soil water potential was monitored as a function of depth and time. The objective of the study is to understand the long-term hydraulic performance and rate of saturation of diff erent layers of MLCS. Under constant water ponding, the time to saturation for 0.3 m in surface layer, 0.6 m in drainage layer and 1.0 m in hydraulic barrier layer was observed as 24, 223 and 262 days, respectively. The numerical analysis of the MLCS predicted comparable time duration of 25, 234 and 272 days, respectively. It was noted that the numerical simulation performed by using measured wetting hydraulic parameters matched well with the experimental observation. The importance of soil specifi c calibration of water content sensors to improve the accuracy of observations was demonstrated. Percentage error in the estimation of layer specifi c soil water storage, clearly indicates that the volumetric water content measurements using profi le probe was marginally better than 5TM measurements.
Keywords: waste, disposal facility, cover system, sensor, numerical simulation, water infi ltration
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