Data to incorporate air behaviour during pipe filling events in SWMM (AirSWMMv1.0)

Stormwater management model (SWMM) software has recently become a modeling tool for the simulation of intermittent water supply systems. However, SWMM is not capable of accurately simulating the air behavior in the pipe-filling phase, missing therefore a relevant factor during pipe pressurization. This work proposes the integration of a conventional accumulator model in the existing SWMM hydraulic model to overcome this gap. SWMM source code was modified to calculate the air piezometric head inside the pipe based on the system boundary conditions, and the air piezometric head was incorporated in the SWMM flow rate pressure component. Experimental data were collected during the rapid filling of a pipe system for three possible configurations that are likely to occur in intermittent water supply pipe systems: no air release, small air release, and large air release. Results show that the improved SWMM better describes the effect of the air behavior using the extended transport (EXTRAN) surcharge method when compared to the original SWMM. Results also show that the SLOT method with predefined slot width is not suitable for this purpose; thus, further research is needed to assess if an adjusted slot width could provide better results.

雨水管理模型（Stormwater Management Model，SWMM）近年来已成为间歇性供水系统模拟的常用建模工具。然而，原始SWMM无法准确模拟管道充水阶段的空气行为，因此在管道加压过程中遗漏了这一关键影响因素。本研究提出将常规蓄气器模型集成到现有SWMM水力模型中，以填补这一研究空白。研究人员修改了SWMM源代码，使其可基于系统边界条件计算管道内部的空气测压水头，并将该空气测压水头纳入SWMM的流量-压力计算分量。研究针对间歇性供水管道系统中常见的三种典型配置场景——无排气、小排气和大排气，在管道系统快速充水过程中采集了实验数据。结果表明，相较于原始SWMM，改进后的SWMM采用扩展输运（EXTRAN）满管流方法时，能够更精准地刻画空气行为对系统的影响。同时研究发现，采用预设槽宽的SLOT方法并不适用于该研究场景，因此仍需开展进一步研究，以评估调整槽宽是否能够获得更优的模拟效果。