中文摘要：

积雪是干旱半干旱区珍贵的可再生水资源,因此许多研究机构和人员将西北地区积雪特性的研究视为重点,然而对积雪介电常数的研究仍很少.积雪介电常数是建立积雪特性反演模型和雪水资源评估的基础,也是雪灾防灾减灾工作的辅助信息.为了研究不同雪层干雪和风吹雪介电常数与温度和频率之间的关系,使用I-V方法测量了巴音布鲁克区域干雪表、中、底层雪和风吹雪在1 Hz～1 MHz低频范围,-30～0℃温度区间内介电常数的实部和虚部.结果表明在1 Hz～1 MHz频率范围内干雪及风吹雪的介电常数与温度和频率有关;其中介电常数实部与虚部对温度和频率的响应相似,但虚部对温度的响应更加敏感;同时介电常数对温度的响应要比对频率的响应明显.最后得出了干雪表、中、底层雪和风吹雪介电常数实部与温度之间的线性关系,R2均大于0.85.

英文摘要：

Snowis precious renewable water resources in arid and semi-arid regions. Consequently,many institutions and researchers have focused on researching the characteristics of snow in Northwest China,but less attention has been put to researching dielectric constant of snow . The dielectric constant of snow is the foundation to establish inversion model of snow characteristics and to assess snow water resources,as well as to get the auxiliary information for preventing and mitigating snow disasters. I-V method was adopted to measure the dielectric constant＇s real and imaginary components of dry snow at surface,middle and bottom,as well as of snow drift,in Bayinbuluk under measuring frequency range of 1 Hz ～ 1 MHz and at-30 ～ 0 ℃,in order to establish the relationships between dielectric constant of dry snow ,snow drift at different snow depths and temperatures and measuring frequencies,respectively. The result showed that dielectric constant of dry snow and snow drift is related to temperature and measuring frequency ranging from 1 Hz to 1 MHz;meanwhile,the response of dielectric constant＇s imaginary parts to temperature and measuring frequency is a little more sensitive than that of the real parts. However,dielectric constant＇s response to temperature is more obvious than that to measuring frequency.At last,the linear relationships between temperature and the real parts of dielectric constant of dry snow at surface,middle and bottom,as well as snow drift,are obtained,with R2 greater than 0.85.