Department of Civil Engineering and Architecture, University of Catania, Viale A. Doria, 6, I-95125, Catania, Italy.
Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata, 3, I-27100, Pavia, Italy.
Water Res. 2019 Oct 15;163:114903. doi: 10.1016/j.watres.2019.114903. Epub 2019 Jul 24.
A novel unsteady flow numerical model for the simulation of the transport of non-uniform non-cohesive sediment mixtures (SM) during flushing operation in sewers is presented in this paper. The model was applied to the case of a flush experimental test that was recently carried out in a combined sewer channel of the sewer system of Paris city that exhibits depositional problems due to relatively coarse sediments. The model output was compared to the results of the field experiments as well as to those obtained with a model for the transport of uniform sediments (US). The model for SM provided a reliable interpretation of the selective transport of the sediments deposited in the channel bed as induced by the flush. The comparison showed the model for SM to provide an enhanced description of the erosional effects of the flush on the deposits, including improved evaluation of the volume of sediments flushed out of the experimental channel in the field.
本文提出了一种新颖的非定常流数值模型，用于模拟污水管道冲洗作业中非均匀非粘性泥沙混合物（SM）的输送过程。该模型应用于最近在巴黎市污水系统的合流制污水渠道中进行的冲洗实验案例，该渠道由于存在相对较粗的泥沙而存在沉积问题。模型输出结果与现场实验结果以及用于均匀泥沙输送的模型（US）的结果进行了比较。SM 模型能够可靠地解释冲洗作用下对沉积泥沙的选择性输送。比较结果表明，SM 模型能够更准确地描述冲洗对沉积物的侵蚀作用，包括对现场实验渠道中冲洗出的沉积物体积的更准确评估。
