Seite - 219 - in Book of Full Papers - Symposium Hydro Engineering

6. SUMMARY After the construction of the Three Gorges reservoir, the average annual precipitation in the reservoir area decreased, but the number of rainstorm days increased, and the precipitation intensity in the reservoir area became larger. Compared with the pre storage, The annual average temperature, the annual average maximum temperature and the minimum temperature increased significantly, and the warming was obvious in spring and autumn. After the completion of the reservoir, the annual evaporation amount increased slightly, but the change trend was not significant, the annual relative humidity decreased, the annual fog days decreased, and the change trend was significant. Over the past 50 years the average temperature rise, precipitation has interdecadal characteristics. from 1999 the rainy period was less rain, The change of temperature and precipitation is basically the same as that in the southwest and the Yangtze River Basin .After the completion of the Three Gorges reservoir, the temperature in the vicinity of the reservoir area was fine-tuning, warm in winter and cool in summer . After the change of water level, the impoundment only has a slight effect on the climate in some areas, but the influence range is not more than 20 kilometers. There is no obvious change in the climate of the reservoir and surrounding areas. 219