A shock-fitting approach for predicting the two-phase transient flows in stormwater systems (SWS) with best management practices (BMP)

城市排水基础设施的设计者和管理者意识到，当用于复杂情况(快速变化的水流、瞬变水流等)时，现有的方法是有限的。因为简化了流动能量和连续性方程的表示。拟议的研究计划的目标是开发一套用于计算雨水系统(SWS)中水动力条件的数值工具，其中可能整合了最佳管理实践(BMP)。这些工具将考虑所有流动类型，包括瞬变流动、空气的存在、非永久性摩擦、同时存在一波以上的增压/降压、边界条件的复杂性以及沙井中的水存储。所提议的数值工具的动态行为可望更好地描述洪水情景下水资源系统中的瞬变流动，并将这一新知识与现有的水管理、洪水和新水资源系统的水力设计方法相结合。此外，本研究旨在解决参与城市排水基础设施的管理人员和设计者的几个问题。为此，我们确定了四个具体的目标：(1)带有夹带气囊的混合瞬变流动动力学的实验分析；(2)BMP在SWS中的积分及其对两相瞬变流动发生的影响；(3)发展一种基于激波拟合法的方法，用于更复杂和实际的SWS情形；(4)修正瞬变流区的控制方程；(5)建立激波捕获和激波拟合技术的选择准则。最终，该项目的目标是开发和提供可整合到现有SWS模型中的计算工具(针对每个已确定的特定目标)。这一拟议项目的结果(将纳入科学论文、数值工具和SWS准则)将对未来和当前可持续SWS的设计程序产生重要影响。工程师需要有效的设计指南，以确保安全水槽设计充分，以保证公众和环境的安全。加拿大咨询和市政工程师意识到了可持续和长寿命排水系统设计的过渡现象。

Designers and managers of urban drainage infrastructure are aware that available current methods are limited when used in complex cases (rapidly varying flows, transient flows, etc.) because of a simplified representation of the flow energy and continuity equations. The goal of the proposed research program is to develop a set of numerical tools for calculating hydrodynamic conditions in Storm Water Systems (SWS) where Best Management Practices (BMP) may be integrated. These tools will take into account all flow types including transient flows, the presence of air, the non-permanent friction, the simultaneous presence of more than one wave of pressurization/depressurization, the complexity of boundary conditions and the water storage in manholes. The dynamic behaviour of the proposed numerical tools is expected to better characterize transient flows in SWS during flood scenarios and to integrate this new knowledge to current methods of water management flood and hydraulic design of new SWS. Moreover, the present study is intended to address several concerns from managers and designers involved with urban drainage infrastructure. Therefore, four specific objectives have been identified: (1) Experimental analysis of the dynamics of mixed transient flow with entrapped air pockets, (2) Integration of BMP in SWS and their impact on the occurrence of two-phase transient flows, (3) Development of a proposed method based on the shock-fitting approach for more complex and practical SWS cases, (4) Modifying the governing equations of the transient flow region and (5) Establishment of selective criteria of shock-capturing and shock-fitting techniques. Ultimately, the project aims to develop and offer computational tools (for each of the identified specific objectives) that can be integrated into existing SWS models. The findings of this proposed project (to be included in scientific papers, numerical tools and SWS Guidelines) will have an important impact on the design procedure of future and current sustainable SWS. Engineers require efficient design guidelines to ensure that SWS are adequately designed to guarantee the safety of the public and the environment. Canadian consulting and municipal engineers are aware of the transition phenomenon for sustainable and long lifespan drainage systems' design.