摘要
双线偏振雷达在定量测量降雨量的过程中，经常受到地物回波的干扰和影响。研究云和地物回波的反射率因子ＺＨ、差反射率因子ＺＤＲ的取值大小及两者的关系、空间变化梯度的结果表明：云的ＺＤＲ大于零，且有明显的随ＺＨ增加而增大的趋势，这反映了在强降雨回波中大粒子占的比例较大；而地物回波的ＺＨ和ＺＤＲ无明显变化规律，ＺＤＲ可正可负；云回波的空间变化率也明显小于地物回波。在此基础上建立了一个剔除地物回波的模式，经过实际资料检验。
The clutter echo affects the measurement of rainfall rate and hydrologic forecast with dual linear polarization radar.In this paper,we have studied the range of reflectivity Z H and differential reflectivity Z DR and their spatial distributions in rainfall and clutter regions.The Z DR of rainfall is positive and increases with increase of Z H.This phenomena proved that there are more large particles in the region with great Z H.But for the clutter, the values of Z DR are positive or negative,and there is no obvious relationship between Z H and Z DR ,the spatial variability of Z H and Z DR is greater than rainfall area.Based on these research,we have developed a model of discrimination between rainfall and clutter.The results of test is satisfied.This work is a new method reducing the effects of clutters on the dual linear polarization radar measurement,it can improved the results of measuring rainfall and hydrologic forecast.
出处
《高原气象》
CSCD
北大核心
1996年第3期303-310,共8页
Plateau Meteorology
基金
"八五"攻关项目
关键词
双线偏振雷达
地物回波
识别法
云
Dual linear polarization radar The discrimination clutter echo
