基于观测和模型的风致漂移系数研究

Study of wind-induced drift coefficients based  on observation and numerical model

摘要: 在进行海上搜救目标漂移轨迹预测时，风致漂移系数的取值将影响预测的准确性．使用2011年5月南海部级联合搜救演习期间位于莺歌海海域模拟人和救生筏的现场漂移轨迹资料，结合风场和流场的数值模拟研究，对模拟人和救生筏的风致漂移系数进行了推导及检验．结果表明，模拟人和救生筏的风致漂移系数分别取0.017和0.065较为合适，该结论可为落水人员和救生筏的漂移预测提供参考．另外，首次借助了风场和流场数值模拟结果来推导风致漂移系数，可以有效弥补观测资料的不足．

Abstract: The size and shape of the drift objects are important factors in computing the wind-induced velocity and  predicting the drift trajectory in the sea. It is necessary to carry out drifting trials and study the wind-induced drift  coefficients for specific drift objects. In this paper, measured data in the search and rescue experiment in Yingge  Sea in May 2011, combined with wind and current numerical data was used to derive the wind-induced drift coeffi- cients of human body model and life raft. Tlie results indicated that the wind-induced coefficient is 0. 017 for hu man body model and 0.065 for life raft in this area. Applying model result to make up the insufficient observation  data in the study of wind-induced coefficient is the innovative point.