Campisano A, Modica C
Dipartimento di Ingegneria Civile e Ambientale, Università di Catania, V.le A. Doria, 6, 95125 Catania, Italy.
Water Sci Technol. 2003;47(4):123-8.
Many relevant problems of drainage systems such as first flush pollution, flow capacity reduction and consequent risks of surcharges are worsened by sediment accumulation in sewer collectors. For the solution of these problems several sediment cleansing methods and techniques, e.g. mechanical methods, traps and flushing devices, have been developed and applied in the last decades. In particular, simulation studies and experimental campaigns have shown the effectiveness of flushing methods as preventive cleansing strategy in sewer collectors. In this paper the results of a numerical investigation for determining flushing waves characteristics both in terms of duration and flow rate are presented. The collector section lengths where flow velocities and average shear stresses determined by flushing waves exceed minimum threshold values are evaluated using a dimensionless approach. The results, related to the operative ranges of the practical applications, are exposed by means of graphs and regressive equations.
下水道集水井中的沉积物堆积会加剧排水系统的许多相关问题，如初期冲刷污染、排水能力降低以及随之而来的溢流风险。在过去几十年里，为了解决这些问题，人们开发并应用了多种沉积物清理方法和技术，例如机械方法、截留装置和冲洗设备。特别是，模拟研究和实验活动表明，冲洗方法作为下水道集水井的预防性清理策略是有效的。本文给出了一项数值研究的结果，该研究旨在确定冲洗波在持续时间和流速方面的特性。使用无量纲方法评估冲洗波所确定的流速和平均剪应力超过最小阈值的集水井段长度。与实际应用操作范围相关的结果通过图表和回归方程展示出来。
