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Development of a snowfall estimate system using two Doppler radars

使用两个多普勒雷达开发降雪估算系统

基本信息

批准号：
17560383
负责人：
SHIINA Toru
金额：
$ 2.24万
依托单位：
Toyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560383/
关键词：
Doppler radar snowfall estimate

项目摘要

To estimate snowfall phenomena, we measured snowfall process that snow particles fell near the ground from snow clouds. The results were given as follows.1. Measurement of the quality of snowfall particles by an image processing techniqueWe observed the diameter and velocity of snowfall particles which fell in a tower. It was calculated the mass and average density of a snow particle from these data. It was possible to measure the quality of snow particles.2. Measurement of electromagnetic wave reflection echoes in the vertical directionWe installed two small radars (Micro rain radar, made from METEK) in Toyama National College of Technology, the electric building rooftop. It was possible to observe winter snowfall phenomenon using two radars. The power spectrum was approximate at the gamma-distribution function using two parameters and classified in a snowfall pattern.3. Simultaneous measurement system and database constructionIt was simultaneously measured 1 and 2. We integrated these measurement data and analysis results into the database. From the relation between 1 and 2, it was possible to calculate the snowfall rate and estimate the kind of precipitation using the two radar parameter.4. Correlation analysis of radar reflectivityWe estimated the correlation analysis between the radar reflectivity in every height. It was possible to estimate the arrival time which snow particles fell on the ground from clouds.

为了估计降雪现象，我们测量了降雪过程，雪颗粒从雪云中落在地面附近。结果如下：1。用图像处理技术测量降雪颗粒的质量我们观测了落在塔中的降雪颗粒的直径和速度。根据这些数据计算出雪粒子的质量和平均密度。测量雪粒的质量是可能的。垂直方向电磁波反射回波测量我们在富山国立理工大学的电力大楼屋顶安装了两个小型雷达（微型雨雷达，由METEK制造）。利用两台雷达可以观测冬季降雪现象。功率谱用两个参数近似于伽马分布函数，并按降雪模式分类。同时测量系统和数据库的构建。同时测量1和2。我们将这些测量数据和分析结果整合到数据库中。根据1和2的关系，可以计算降雪率，并利用两个雷达参数估计降水种类。雷达反射率相关分析我们估计了各高度雷达反射率之间的相关分析。可以估计出从云层中落下的雪粒到达地面的时间。