【摘要】 本文在分析洞庭湖的水域效应与对比分析洞庭湖、长江三峡地区地形效应的基础上，对三峡水库的气候效应进行了预测。湖泊可以调节气温，缓和温度的极端变化，高温日数比周边减少15～20天，低温日数亦有所减少，温度平均日较差降低1．6～2．4℃，空气湿度略有增加。洞庭湖区地形对年平均温度、年降水量的影响均为负效应。三峡地区温度为正效应；海拔300米以下，年降水量为负效应．海拔300－800来为正效应，1月降水为正效应，7月为负效应。三峡水库建成后，冬季将有所变暖，海拔300－800来的山地降水将增多，冬季增雨、夏季减雨的趋势更明显，空气湿度稍有增加。更多还原

【Abstract】 In this paper,Climate effects of water body over Dongting Lake basin are analysis, and Dangting Lake basin be compared with Sanxia district in the Climatic effects of topography. At the base of aforementioned analysis , Climatic effects of Sanxia reservoir are predicted. The lake can regulate the air temperature,It may relax the extreme change of the temperature. The days of high temperature in Dongting Lake basin are less 15 - 20day than that of the close district. The days of low temperature also decrease. The average daily range of temperature reduces 1. 6 - 2. 4℃. In Dongting lake basin effects of topography on annual mean temperature and annual precipitation is both negative effect. In Sanxia district, that of temperature is positive effect, below an elevation of 300mm, that of annual precipitation is negative effect, An elevation of 300-800 metre is positive effect. That January precipitation is positive effect, that of July precipitation is negative effect. When Sanxia reservoir will be built, in this district,winter will become warm, in the mountain of an elevation of 300-800mm, the rainfall amount will increase. It is quite clear that winter rainfall amount will increase and rainfall amount will decrease in Summer is the trend. The air humidity will increase.更多还原