Simulating thermal regimes in Miyun Reservoir of Beijing, China under future scenarios

Dejun Zhu, Zehua Duan, Yongcan Chen

Friday 3 july 2015

12:57 - 13:00h at Oceania (level 0)

Themes: (T) Hydro-environment, (ST) Ecohydraulics and ecohydrology, Poster pitches

Parallel session: Poster pitches: 15K. Deltas - Wetland

Miyun Reservoir (40°25’N – 40°38’N, 116°47’E – 117°10’E) is the only surface water source for the city of Beijing. Since the completion of its construction in 1960, the reservoir has been providing not only drinking, irrigation, and industrial water for millions of people but also recreational opportunities and habitat for various aquatic organisms. In order to solve the water shortage in Beijing and other cities in North China, the Middle Routine Project (MRP) for the South-to-North Water Diversion is under construction now and will soon be completed. After MPR is completed, Miyun reservoir will be used to store excessive water temporarily in the first 5 years, i.e., from 2015 to 2019. The entrance of water from MRP will alter thermal regimes in Miyun Reservoir and in turn has an impact on its water quality and ecological functions. When simulating thermal regimes in a reservoir, three indispensable processes, including surface heat exchange, bottom heat exchange, and heat flux through inflow and outflow, should be under consideration. All these processes are sensitive to climate conditions, so global warming and climate change may alter limnological characteristics of the reservoir. In this study, a refined version of the one dimensional vertical water quality model MINLAKE was used to simulate the thermal regimes in Miyun Reservoir under future scenarios. The model was chosen because it had been successfully applied in Miyun Reservoir in previous researches. The results presented will provide useful information and insights to water managers and policy makers in China about what will/may happen to Miyun Reservoir.