青藏铁路沱沱河路段风沙危害特征及其动力环境分析

Wind-blown Hazard and its Dynamic Environment in Tuotuohe Region along Qinghai-Tibet Railway

利用青藏铁路沿线沱沱河站详细的风况资料,结合风沙灾害的实地调查数据,在分析沙害特点、来源及其危害特征的基础上,从输沙强度、合成输沙势、起沙风玫瑰及其季节变化等方面对沱沱河路段风沙活动特点及其动力环境做了详细研究。沱沱河路段起沙风向具有明显的季节性,冬春季风向单一,主导风向为西风,持续时间较长。夏季东北风有所增加,出现短暂的多风向季节。年输沙势DP为705.81VU,属于高能风能环境。年方向变率(RDP/DP)为0.84,年合成输沙势RDP为590.42VU,合成输沙方向RDD为89.1°,合成输沙风向以西风为主。

By use of the specific wind data of Tuotuohe Meteorological Station and field survey materials of wind-blown sand hazard along Qinghai-Tibet railway, this paper researched the wind-blown hazard and its dynamical environment in Tuotuohe region along Qinghai-Tibet railway based on the analysis of sand-laden wind and drift potential. The results are as follows. The directions of sand-laden wind vary with season obviously. The sand-laden wind has a singular direction in winter and spring, and its prevailing direction is westerly. The times of northeast wind increase in summer. Drift potential in Ttuotuohe region is 705.81 VU, so it has a high wind energy. The directional variability of the wind （RDP/DP） is 0.84, and the resultant drift potential is 590.42 VU with the direction of 89.1.