Author(s): Yanqiang Wang; Zhigang Wang; Zhuo Yang; Dong Zhang; Jingbo Yu

Linked Author(s):

Keywords: Siphon-type; Emergency; Flood discharging technology; On-site experiments; Environmentally friendly

Abstract: Many small reservoirs in China were built in the 1950's to 1970's. With the operation for several decades, some problems have emerged, such as the aging of the water transmission and flood discharge facilities and the reducing of the flood discharge capacity, which would threaten the safety of relative structures and downstream residents, especially when the extreme storm is striking, and thus should be paid more attention to. In order to improve this situation, multiple tests and theoretical analysis were conducted, both in the lab and on site, and finally a siphon-type emergency flood discharging technology was proposed. It is light and easy to install. It's mainly made of fiber reinforced plastic (FRP) with the density of 1.5 g/cm3 ~2.0 g/cm3, but its strength is close to that of ordinary carbon steel. Thus, it could be easily installed by only 2 people within no more than 2 days, which is beneficial to save time and better prepare for the strike of extreme storm. The second characteristics of this siphon-type technology is the large discharging flowrate. According to the test results so far, the maximum diameter of 400mm can be used and a maximum total of about 70000m3 of flood can be discharged per day. It can significantly relieve the discharging pressure of the reservoir. The third characteristics of the technology is low-carbon and environmentally friendly. The new proposed technology is running based on the siphoning which used the gravitational potential energy of the water in the flow. Additional energy is needed only when the siphon flow is at the start. Clearly, it is environmentally better than pumping water using electric powered pumps. The last advantage is the new technology can be used as a temporary structure, and it doesn't damage or change the original hydraulic structure. If no longer in use, it can be fully removed easily. The new siphon-type technology has been proved successfully by testing on site at Toudaoguan Reservoir and Bailongtan Reservoir in Beijing.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p1444-cd

Year: 2023