Characterizing and modelling the trapping efficiency of sedimentation basins downstream of harvested peat bog

Myriam Samson-Dô, André St-Hilaire
2018 Canadian journal of civil engineering (Print)  
17 Peat moss harvesting is an important industry in Canada. To harvest peat, the water table of the peatland must 18 be lowered to allow the surficial peat layer to dry and be harvested. Drainage water can contain suspended 19 sediments, so at most harvesting sites, the water is routed through sedimentation basins. This work focuses on 20 characterizing and modelling their trapping efficiency. Eight basins with different volume/watershed area 21 ratios (705 to 4170 m 3 /km 2 ) were studied in
more » ... ) were studied in three Quebec regions. Suspended sediment concentration and 22 discharge were monitored up-and downstream of each basin during the ice-free season. Basins with high 23 ratios of volume/drainage area, multiple basin configurations (i.e., two basins in series or in parallel) and those 24 equipped with a flow regulation structure were more efficient than regular basins. Moreover, the nature of 25 sediments (size, decomposition level and organic content) influences loads, but not the trapping efficiency.
doi:10.1139/cjce-2017-0330 fatcat:oqzdorg6t5ddnhyy2vf7tlmxhy