主要用于ROMS海洋模式，主要用来计算海地地形的粗糙程度，该参数不大于0.2的情况下，才能保证模式计算的稳定性-Mainly used for ROMS ocean model, mainly used to calculate the degree of roughness of Haiti topography, the parameter is not greater than 0.2, to ensure the stability of model calculation