Operation Safety Monitoring Technology and Its Application in Urban Water Supply Network

Abstract:

There are problems of incomplete information and lack of means in monitoring the operation safety of urban water supply pipeline networks. First， pipe loss data was analyzed to understand the influencing factors of water supply network operation safety. Protective monitoring and preventive monitoring were proposed for different purposes. Monitoring indexes were established， including the operation status， pipe structure， and environment conditions. Then， the path loss of wireless signal transmission for buried pipelines in the soil was studied. Finally， a monitoring system was deployed at the emergency repair site of Shanghai Water Supply Network. The results indicate that there are lots of pipe loss at the location involving the intersection， overlapping pipelines， and alternating load. They are the key locations for monitoring. The volumetric water content of soil is the main factor affecting the path loss of wireless signals. The path loss of sandy soil is smaller than that of clay soil at a high water content. The multi-hop network can effectively improve the penetrability of wireless network. The compactness of the backfill below the pipeline has a great impact on the later settlement of the pipeline. Therefore the quality of the backfill should be ensured. Structural monitoring can precede leakage， pressure， and flow change of water supply network for safety warnings.

Key words:water supply networks;structural health monitoring;operation safety;wireless sensor network;path loss of wireless signal transmission in soil