Study on distribution regularity of water temperature on pingshang reservoir

The temperature of water and discharged water on Pingshang Reservoir may impact the aquatic ecosystem of natural channel, agriculture and industry downstream and domestic water. The goal is predicting the impact and water temperature regularity of distribution, and laying the foundation for the environmental evaluation, planning and management. A three-dimensional temperature model was used to simulate the distribution architecture of reservoir water temperature on normal year, and analyzed the distribution regularity of water temperature and the changing process of temperature distribution structure. December to next February, the water temperature was low, and the reservoir showed typical hierarchical status. In March, the air temperature and surface temperature began to rise. In April, an inversion of temperature appeared. In May and June, the temperature of coming water was increasing gradually. The cold water had been impelled all along and was basically replaced by the hot water in July. In September and October, with the decreased temperature of coming water, the previous hot water in the reservoir had been impelled forward. And the water temperature was showing a distinct billowing status. In November, the billowing status continued. Then the reservoir was resumed to the hierarchical status in December. The results presented a hierarchical status of reservoir for most months. After the completion of the reservoir, the temperature of discharged water in summer is lower than that of the original natural river water. The maximum temperature difference is less than 3°C. It won´t affect the normal growth of aquatic organisms downstream.