由海底摩擦与平均流速的平方成正比的公式,对底摩擦的性质(主要对拖曳系数C_0)进行讨论。研究在风暴潮和天文潮的条件下,海底摩擦与风速,风向和海深等因素的关系,得到有关奇异区的存在等结论,说明在整个海区内拖曳系数不为常数。 The nature of the underfriction (mainly the drag coefficient C_0) is discussed by the equation that the seafloor friction is proportional to the square of the mean velocity. The relationship between submarine friction and wind speed, wind direction and sea depth under the condition of storm surge and astronomical tide is studied. The conclusion about the existence of singularity zone is obtained, which shows that the drag coefficient is not constant in the whole sea area.