深层调蓄隧道与浅层排水系统协同提标控污影响因素研究

Study on Influencing Factors of Synergistic Upgrading and Pollution Control of Deep Storage Tunnels and Shallow Drainage Systems

摘要:

深层排水调蓄隧道与浅层排水系统协同提标、控污目标的实现，受到外部因素与内部因素的共同影响。其中，外部因素主要为雨型、降雨强度；内部因素包括系统本身的排水设施能力（泵排模数）、降雨前管网的初始水位、入流堰的调度，以及市政雨水泵站的运行。以某特大城市中心城区深层排水调蓄隧道工程为例，重点研究浅层排水系统设施能力对深层排水调蓄隧道提标、控污2大目标实现的影响。研究发现，深层排水调蓄隧道提标、控污2大功能的发挥，与各分区系统本身的泵排模数，即系统本底的“先天条件”具有显著的相关性。对于研究区域内的系统，当系统本身的泵排模数相对较大时，即大于12 m3/（s·km²），在不同设计降雨重现期条件下，控污与提标2大目标可同时实现；当系统本身的泵排模数相对较小时，即小于12 m3/（s·km²），在5年一遇暴雨条件下，可考虑采取统筹优化调蓄空间的时空分配，或挖掘二、三级管道潜力等辅助手段来实现双重目标。

Abstract:

The achievement of synergistic upgrading and pollution control goals of deep drainage storage tunnel and shallow drainage system is influenced by external factors and internal factors, in which the external factors are mainly the type and intensity of rainfall, and the internal factors include the drainage facility capacity of the system itself (pump discharge modulus), the initial water level of the pipe network before rainfall, the scheduling of the inflow weir, and the operation of the municipal rainwater pumping station. Taking the deep drainage and storage tunnel project in the central urban area of a megacity as an example, the key research focuses on the impact of the capacity of shallow drainage system facilities on the realization of the two major goals of upgrading and pollution control of deep drainage storage tunnels. The results indicate that the performance of the two major functions of deep drainage and storage tunnels, namely upgrading and pollution control, is significantly correlated with the pump discharge modulus of each zone system itself, that is, the “inherent conditions” of the system background. For the systems within the study area, when the pump discharge modulus of the system itself is relatively large, that is, greater than 12 m3/(s·km2), under the different design rainfall recurrence periods, the two major goals of pollution control and upgrading can be achieved simultaneously. When the pump discharge modulus of the system itself is relatively small, that is, less than 12 m3/(s·km2), under the condition of a once-in-five-year rainstorm, it is advisable to consider optimizing the spatio-temporal allocation of the storage space in a coordinated manner, or by tapping the potential of secondary and tertiary pipelines and other auxiliary means, the dual goals are achieved.