Wind Conditions and Characteristics of Sand Transport Potential in the Desert-oasis Transition Zone in the Middle Reaches of the Heihe River:Taking Linze County as an Example
Wind Conditions and Characteristics of Sand Transport Potential in the Desert-oasis Transition Zone in the Middle Reaches of the Heihe River:Taking Linze County as an Example
张钰佳 1张媛2
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作者信息
1. 兰州工业学院 土木工程学院,甘肃 兰州 730050
2. 兰州工业学院 艺术设计学院,甘肃 兰州 730050
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摘要
基于甘肃临泽农田生态系统国家野外科学观测研究站气象观测数据,在分析黑河中游沙漠-绿洲过渡带的起沙风风况和输沙势特征变化情况的基础上,评估了区域风能状况.结果表明:研究区年均起沙风风速为6.12 m/s,年均起沙风频率为5.57%,最大风速为 23.3 m/s;研究区年起沙风向主要以偏东风(NNE、NE、ENE、E)和偏西风(WNW、NW、W)为主;研究区年输沙势(DP)和年合成输沙势(RDP)分别为 18.88 VU 和 6.10 VU,属于低风能环境;年方向变率指数(RDP/DP)为0.32,属于中比率的钝双峰或锐双峰型风况;年合成输沙势方向(RDD)267.05°,为W方向,表明黑河中游沙漠-绿洲过渡带沙物质主要朝西方向输移;风能环境在春季最大,在这期间可通过适当的防护措施截留沙物质,进而减少风沙灾害的发生.
Abstract
Based on the meteorological observation data of the National Field Scientific Observation and Research Station of Linze Farmland Ecosystem in Gansu Province,this paper analyzes the changes of the wind conditions and the characteristics of the sand transport potential in the desert-oasis transition zone in the middle reaches of the Heihe River,and the regional wind energy situation is evaluated.The results show that the annual average wind speed of sand driving wind in the study area is 6.12 m/s,its annual average frequency is 5.57%,and the maximum wind speed is 23.3 m/s.The annual sand wind direction in the study area is mainly east wind(NNE,NE,ENE,E)and west wind(WNW,NW,W).The annual drift potential(DP)and annual resultant drift poten-tial(RDP)in the study area are 18.88 VU and 6.10 VU,respectively,belonging to a low wind energy environ-ment;the annual directional variability index(RDP/DP)is 0.32,which is a medium ratio blunt bimodal or sharp bimodal wind conditions;the annual resultant drift direct(RDD)is 267.05°,which is the W direction,indicating that the sand material in the desert-oasis transition zone in the middle reaches of the Heihe River mainly transports towards the west.The wind energy environment is the largest in spring,during which time appropriate protective measures can be used to trap sand materials,thereby reducing the occurrence of wind and sand disasters.
关键词
沙漠-绿洲过渡带/起沙风/输沙势/风能环境/黑河中游
Key words
desert-oasis transition zone/sand-driving wind/drift potential/wind energy environment/middle reaches of Heihe River
万方数据