摘要
利用2006年4月和8月塔中地区近地层10m处的湍流资料,分析了该地区春夏季湍流强度和湍流动能的变化,同时对湍流动能供给率做了讨论。结果表明,在近中性层结条件下,3个方向的湍流强度均接近常数,而无因次扰动动能则随稳定或不稳定程度的增大也有增大趋势;在强不稳定层结条件时,热力湍能供给率明显强于机械湍能供给率,而处于稳定层结条件时,热力湍能供给率则减为负值,表现为抑制作用。
Using the turbulent data obtained at the height of 10 m in Taklimakan hinterland,this paper analyzes the spring and summer variations characteristics of the turbulent intensity and the turbulent kinetic energy,discusses turbulent supply rate.The results are as follows：Under near neutral condition,the turbulent intensities in three directions are approximate constants,the dimensionless perturbation kinetic energy increases along with the increase of stable or the unstable degree;Under the unstable condition,the thermal turbulent supply rate displays stronger than the mechanical obviouly,under stable condition,the thermal turbulent supply rate reduces to the negative value,representing inhibition function.
出处
《中国沙漠》
CSCD
北大核心
2010年第2期439-444,共6页
Journal of Desert Research
基金
气象灾害省部共建教育部重点实验室基金项目(KLME-050103)
国家自然科学基金项目(40775019)资助
关键词
塔克拉玛干
沙漠腹地
近地层
湍流强度
湍流动能
Taklimakan Desert
hinterland
surface layer
turbulent intensity
turbulent kinetic energy
