摘要
鄱阳湖沿岸风沙活动对经济发展和生态环境产生较大危害。探究环湖风沙环境和输沙势(DP)的时空变化,了解鄱阳湖沙地侵蚀规律,对鄱阳湖防沙的重点区域具有重要意义。基于2005—2020年鄱阳湖沿岸九江、庐山、星子、永修、都昌、鄱阳和南昌7个气象站点的风况数据,利用输沙势分析其沙地的风能环境特征。结果表明:1)2005—2020年鄱阳湖沿岸的起沙风速波动减小,起沙风风频冬季最高,夏季最低,风向偏北。2)研究区内DP年际变化整体呈下降趋势,季节差异性较大,春冬季大于夏秋季;空间异质性显著,呈北高南低,西高东低的空间格局,庐山和星子最大,鄱阳最小。庐山站处于中风能环境,其他6个站点属于低风能环境。DP的风向集中分布在N-NE,合成输沙方向指向偏西南。3)风向变率存在明显的区域差异现象,南昌和永修表现出较大变率的单峰状态,其他5地则较多处于中等变率的双峰状态。总体上,DP时空演变差异与沙地面积变化一致,合成输沙势与沙地面积同期增大或减小,高值区分布在沙地面积较大处。建议以鄱阳湖西北部、都昌、永修为沙化防治的重点区域。
[Background]There are differences in aeolian activities and expansion velocity of sandy land in different parts of the Poyang Lake coast,which greatly affects the ecological environment and sustainable economic development of the Poyang Lake region.Therefore,strengthening the research on the wind regime and sandy environment of the Poyang Lake helps to understand the erosion patterns of the sandy land in Poyang Lake,and provides guidance for the key directions and regions of sand-control work.[Methods]Based on the wind data of seven meteorological stations along Poyang Lake from the year of 2005 to 2020,including Jiujiang,Lushan,Xingzi,Yongxiu,Duchang,Poyang and Nanchang.The value and direction of sand-driving wind and sand drift potential were calculated,and the characteristics of sand wind activity and wind energy environment of sandy land along Poyang Lake were analyzed and evaluated.[Results]1)The fluctuation of sand-driving wind velocity in almost all stations decreased during 16 years,and presented the largest velocity in the northward directions and the highest sand-driving wind frequency(F s)in winter versus the lowest in summer.2)The sand drift potential(DP)showed a downward trend during the past 16 years,and the seasonal variation was larger,with spring and winter being larger than summer and autumn.The spatial heterogeneity of Poyang Lake was significant,and the spatial distribution was higher in the north and lower in the south,and higher in the west and lower in the east.The wind energy environment in the Lushan station was medium,while the other six stations were low.Moreover,The wind energy environment in the Lushan station was medium,while the other six stations were low.The DPs were primarily derived from north-to-northwest wind directions,which accorded to the south-to-southwest directions of resultant drift potential(RDP).3)There was a significant regional difference in the wind direction variability(C r),Nanchang and Yongxiu had large variability and single peak wind energy,and the other 5 stations had medium variability and double peak wind energy.[Conclusions]The spatial and temporal variation of drift potential was consistent with the variation of sandy land area.The resultant drift potential and sandy land area increased or decreased at the same time,and the high value area was distributed in the large sandy land area.It is suggested that the northwest of Poyang Lake,Duchang and Yongxiu should be the key areas of desertification control.
作者
杨德慧
吴汪洋
高斌
王志琴
陈丹
YANG Dehui;WU Wangyang;GAO Bin;WANG Zhiqin;CHEN Dan(School of Earth Sciences,East China University of Technology,330013,Nanchang,China)
出处
《中国水土保持科学》
CSCD
北大核心
2024年第2期90-98,共9页
Science of Soil and Water Conservation
基金
国家自然科学基金“中国东南和西北地区丹霞地貌陡坡上洞穴成因对比研究”(42361002)
江西省自然科学基金青年基金“鄱阳湖湖岸沙丘的移动形态演变及其风沙危害研究”(20202BABL213028)
东华理工大学博士启动基金(DHBK2019052)。
关键词
输沙势
沙地
起沙风
鄱阳湖
sand drift potential
sandy land
sand-driving wind
the Poyang Lake
作者简介
第一作者:杨德慧(1998-),女,硕士研究生。主要研究方向:风沙地貌防治。E-mail:761759042@qq.com;通信作者:吴汪洋(1988-),男,博士,讲师。主要研究方向:水土保持与荒漠化防治。E-mail:bnuwwy@163.com。
