青海公路沥青路面气候影响二级分区及K值变化研究

利用1971-2002年青海公路沿线44个气象台站的降水、气温、水汽压、相对湿度、风速、日照百分率等地面气象资料,采用Penman公式计算了蒸发力ET,应用气候诊断方法分析了潮湿系数的变化特征.结果表明:按潮湿系数,干季青海省公路沿线全部为过干区,其他季节可分为过干区、中干区和润干区.近30a以来,干季公路沿线的潮湿系数K值呈减小趋势,而过渡季节、雨季和年度潮湿系数K值均呈增大趋势.而这种变化,主要是由气候的年代际波动造成的.

Research on Secondary Partition of Climate Impact on Asphalt Pavement and Change of Value K in Qinghai Province

Using the data of precipitation,temperature,vapor pressure,relative humidity,wind speed and percentage of sunshine from 44 meteorological stations from 1971 to 2002 along the highways in Qinghai Province,the evaporation ET was calculated by using the Penman Formula,and the moist coefficient variation was analyzed by climate diagnostic method.It is found that according to the moist coefficient,the area along the highways in the province mostly belong in the over-dry area in dry season,but in other seasons,belong in over-dry,middle dry and less dry areas.In recent 30 years,the moist coefficient in the dry season along the roads has decreased,while in the transition seasons,rainy and wet seasons,the coefficient has an increasing trend.The change seems to be caused mainly by the inter-decadal climate fluctuation.