道尔顿公式的应用研究

对道尔顿线性公式中的风速函数系数取值范围及其对水面蒸发模拟效果的影响进行全面的对比试验,表明风速函数系数有较宽的适应区间,且在将其中的一个系数取为零的情况下,仍具有较好的模拟效果.结合近年来国内外水面蒸发研究成果,对道尔顿公式中的风速函数进行改进,提出以三段制的分段函数作为风速函数,不仅更符合风速对水面蒸发作用的物理本质,也使水面蒸发时空变化规律的拟合误差明显减小,模拟效果显著提高.

Research on the application of Dalton's formula

A comparative analysis is performed on the suitable range for the coefficients of the wind speed function in Dalton's formula and its influences on the simulated result of water surface evaporation. It is shown that there is a wide range of values suitable for the coefficients of the wide speed function, and that satisfactory results can be obtained even though one of the coefficients equals to zero. In combination with the research result on water surface evaporation at home and abroad in recent years, the wind speed function in Dalton's formula is improved. A segmented function with three steps is proposed to act as the wind speed function. As a result, not only does the new function accord with the physical nature of effect of wind speed on water surface evaporation, but also greatly reduce the error in fitting of the spatial-temporal regularity of water surface evaporation, and the accuracy of simulation is greatly improved.