【摘要】 利用2001年6～7月间在安徽肥西的边界层观测资料,利用变分方法计算地面动量通量和感热通量,进而分别估算该处动量总体输送系数和感热总体输送系数。用变分方法计算的地面粗糙度为0.03m。在中性条件下,10m高处平均动量总体输送系数和感热总体输送系数分别为4.83×10-3和3.81×10-3,比值是1.27。总体输送系数具有明显的日变化特征,中午时段最大,夜晚最小;总体输送系数与大气稳定度存在明显关联,文中给出它们之间的拟合关系式;随着高度的增加总体输送系数减少,但减少幅度逐渐变小。更多还原

【Abstract】 A variational method is used to compute the bulk momentum and sensible heat transfer coefficients in the Huaihe River Basin, based on data collected by ChinaHeavy Rain Experiment and Study （HeRES） Program during June6～July 20,2001 at Feixi Station. By using the variational method the roughness length is calculated and is equal to 0.03 m. On the neutral condition the bulk momentum and sensible heat transfer coefficients at the height of 10 m are respectively equal to 4.83×10^-3and 3.81×10^-3 , and the ratio between them is 1.27.The bulk transfer coefficients change during a day, reach the maximum at noon and the minimum at night. The neutral bulk transfer coefficients for momentum hardly change with the speed of wind. There existobvious relationships between the bulk transfer coefficients and the Obukhov stability parameter, so the approximated formulationsare presented in the paper. With the increase of height the bulk transfer coefficients decrease but the amplitude of its increase will gradually become small.更多还原