重庆市广阳岛生态规划对局地气候影响的数值模拟试验

Numerical Simulation Experiment on the Effect of Ecological Planning on Local Climate in Guangyang Island of Chongqing City

利用城市微尺度模式,模拟分析了重庆广阳岛城市生态规划对局地气候环境的影响。结果表明:城市微尺度模式对原始土地利用方案的精细化模拟显示,广阳岛冬季1月以北风为主,岛屿西侧风速较东侧偏大,而夏季7月的主导风向为东风,岛屿的东北部为偏东风,西南侧为西北风。广阳岛1月和7月的温度场分布都为东高西低。全岛1月都属于舒适度较高的区域,其中岛屿东北部舒适度最高,而7月岛屿东北部由于气温较高,舒适度较低。生态规划方案的模拟表明,对局地小气候影响最大的是温度场,能有效降低了广阳岛的近地面气温。生态规划方案能有效地改善广阳岛的局地小气候,提高人体舒适度,广阳岛冬季1月全岛都较为舒适,而夏季7月舒适度最高的区域位于岛屿中西部。

The effect of ecological planning on local climate in Guangyang Island of Chongqing City is investigated by numerical simulation of urban micro-scale model.The results show that Guangyang Island is dominated by northerlies in January,and the wind speed in west part of the island is relatively bigger.However,the island is prevailed by easterlies in July.The temperature field of the island shows a east-west contrast pattern,i.e.,the east(west)part is high(low),in both January and July.The comfort analysis shows that the island is quite comfortable in January,but is not so comfortable in July because of high temperatures.The numerical simulation of ecological planning shows that the most notable effect of the planning on local climate is temperature field.The ecological planning could significantly reduce the temperature,which improves the human comfort in July.