Haiyang Kaifa yu guanli (Mar 2022)
Simulation and Analysis on the Influence of Thermal Discharge of Seawater Pumped Storage Power Station on Surrounding Sea Area in Dawanshan Island of Zhuhai City
Abstract
The temperature rise of the upper reservoir of the seawater pumped storage power station may affect the seawater temperature of the lower reservoir. In this paper, the thermal discharge of the seawater pumped storage power station proposed to be built on Dawanshan Island in Zhuhai City was simulated and analyzed. The results showed that the seawater pumped storage power station would not have a significant effect on the local sea flow field under the condition of 12.3 m3/s within 8 h drainage from the lower reservoir. When the discharge temperature was 30.2℃, the affected area was 1.76 km2, and the maximum temperature rise was 1.35℃ with the maximum temperature rise area of 0.006 km2 in spring. In summer, the affected area was 1.58 km2, and the maximum temperature rise was 0.7℃ with the maximum temperature rise area of 0.013 km2. In autumn, the affected area was 1.66 km2, and the maximum temperature rise was 0.8℃ with the maximum temperature rise area of 0.085 km2. In winter, the affected area was 1.95 km2, and the maximum temperature rise was 1.9℃ with the maximum temperature rise area of 0.030 km2. The maximum temperature rise in the surrounding sea area increased gradually with the increase of drainage temperature, but the corresponding maximum temperature rise area changed little. When the drainage temperature was 32.2℃, the maximum temperature rise was 0.9℃ and 2.3℃ in summer and winter, respectively. When the drainage temperature was 34.2℃, the maximum temperature rise was 1.15℃ and 2.6℃ in summer and winter, respectively. The maximum temperature rise area was in a range of 0.019~0.027 km2. With the drainage flow increasing from 10.3 to 20.3 m3/s, the maximum temperature rise in the surrounding sea area increased but the maximum temperature rise area was almost kept stable. The maximum temperature rise reached 2.25℃ with the maximum temperature rise area of 0.007 km2 at the drainage flow of 20.3 m3/s. The results should provide a scientific basis for environmental impact assessment and ecological management of seawater pumped storage power station in Dawanshan Island in the future.
