基于AIEM模型的干旱区裸露地表后向散射特性模拟

Simulation of backscattering characteristics of bare surface based on the AIEM model in arid areas

以内蒙古额济纳旗东南的居延泽为研究区,利用高级积分方程模型模拟了不同条件下,后向散射系数对雷达入射角(θ)、土壤水分(M)、均方根高度(S)和相关长度(L)的响应关系.结果表明,在居延泽地区,随着θ的减小、M的提高、S的增加和L的减小,裸露地表的后向散射系数逐渐增大;随着θ的增大、M的提高、S的增大以及L的增加,裸露地表后向散射系数对各参数的敏感性均逐渐降低.

Juyan Lake,a dried-up lake located in the southeast of Ejin Banner,Inner Mongolia,China,was used as the study area.Responses of radar backscattering coefficient to incidence angle(θ),soil moisture(M),root mean square height(S)and correlation length(L)under different conditions were simulated using advanced integrated equation model.The results showed that the backscattering coefficient increased gradually in Juyan Lake with the decrease ofθ,the increase of M and S,as well as the decrease of L.With the increase ofθ,M and S,as well as L,the sensitivity of backscattering coefficient to all the above parameters decreased slowly over the bare surface.