| 基于SRTM数据的广东新一代天气雷达覆盖研究 |
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| 引用本文： | 李明凤,闵超,张阿思,肖柳斯,黄朝盈,詹棠,陈生.基于SRTM数据的广东新一代天气雷达覆盖研究[J].地球信息科学,2018,20(8):1201-1208. |
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| 作者姓名： | 李明凤 闵超 张阿思 肖柳斯 黄朝盈 詹棠 陈生 |
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| 作者单位： | 1. 中山大学大气科学学院,珠海 5190822. 云南省瑞丽市气象局,瑞丽 6786003. 广东省气候变化与自然灾害研究重点实验室,广州 5102754. 广州市气象台,广州 5114305. 广西师范学院地理科学与规划学院,南宁 5300016. 珠海市国家气候观象台,珠海 51900 |
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| 基金项目： | 中山大学“百人计划二期”急需青年杰出人才项目（74110-52601108）;中国气象局预报员专项（CMAYBY2018-052）;广东省气象局科研项目（2015Q15） |
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| 摘 要： | 本文利用SRTM3高分辨率的数字高程模型（DEM）对广东省已建成的12部新一代天气雷达分别进行地形阻挡分析。结果表明,在低仰角（0.5°）的观测结果中,韶关、连州以及肇庆雷达受地形阻挡较严重,深圳、阳江、梅州和汕尾的雷达也有大面积阻挡区域,其余雷达的覆盖效果均很好。随着扫描仰角的抬高,地形对雷达波束的阻挡有所减弱。从第4个仰角 （3.4°）开始,所有雷达均无地形阻挡。在海拔5 km范围内12部雷达可以完全覆盖广东全省,大部分地区至少有4部雷达重叠。离地3 km和海拔3 km的雷达覆盖情况均显示,除广东省北部和西北部极少部分地区没有雷达覆盖外,大部分地区均有2部以上雷达覆盖,珠江三角洲入海口一带甚至有4~6部雷达重叠。在离地2 km范围内,广东省雷达组网能够有效覆盖广东省大部分区域。在离地1 km范围内,广东省北部和西北部雷达覆盖效果不太理想,存在较大的空白区。在离地高度2 km和海拔高度3 km以上,雷达组网基本可以覆盖广东全境,因此可以认为广东省雷达的总体布局较好。
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| 关 键 词： | 新一代天气雷达 数字高程模型 地形阻挡 雷达覆盖 扫描方式 |
| 收稿时间： | 2018-03-25 |
Analysis of CINRAD Coverage in Guangdong Province Based on SRTM Data |
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| LI Mingfeng,MIN Chao,ZHANG Asi,XIAO Liusi,HUANG Chaoying,ZHAN Tang,CHEN Sheng.Analysis of CINRAD Coverage in Guangdong Province Based on SRTM Data[J].Geo-information Science,2018,20(8):1201-1208. |
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| Authors: | LI Mingfeng MIN Chao ZHANG Asi XIAO Liusi HUANG Chaoying ZHAN Tang CHEN Sheng |
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| Institution: | 1. School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai 519082, China2. Ruili Meteorological Bureau, Ruili 678600, China3. Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Guangzhou 510275, China4. Guangzhou Observatory, Guangzhou 511430, China5. School of Geography and Planning, Guangxi Teachers Education University, Nanning 530001, China6. Zhuhai National Climate Observatory,Zhuhai 519000, China |
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| Abstract: | The China Meteorological Administration (CMA) has constructed a radar network of China next generation weather radar (CINRAD) to detect precipitation. In order to investigate the coverage condition of weather radar network, high-resolution digital elevation data of SRTM3 were used to analyze the terrain-blockage of 12 weather radars deployed in Guangdong Province. The beam blockage by mountain was calculated with the following method. Firstly, if the first tilt radar beam is blocked up to 50%, then it is considered that the radar beam does not scatter in the forward direction and the radar beam will jump to the next tilt at the blocked area, the obstructed slant range will be replaced by the second elevation. Secondly, if the mountain peaks are still higher than the radar beam and the radar beam is blocked up to 50%, the third tilt will be adopted. Results show that Shaoguan, Lianzhou and Zhaoqing radars suffer from serious beam blockage at the lowest elevation (0.5°). Additionally, Shenzhen, Yangjiang, Meizhou and Shanwei radars have large blocked areas at 0.5° elevation scan while the rest of radars have a very good coverage. With the raise of radar elevation, the beam blockage will be weaked or the more beams will clear the surface. At 3.4° elevation, all of 12 radars do not suffer from beam blockage. The 12 radars can completely cover Guangdong Province within the height of 5 km above mean sea level (MSL), and there are four adjacent radars in most areas. Radar coverage maps at the height of 3 km above ground level (AGL) and 3 km above MSL show that only a few regions in northern and northwestern Guangdong Province have no radar coverage, while most areas generally have more than 2 radars coverage, and there are 4-6 radars overlapping in the Pearl River Delta area. Within the height of 2 km AGL, the CINRAD network can effectively cover most regions of Guangdong province. Only within the height of 1 km, radar coverage in the northern and northwestern Guangdong Province is a little poor. Generally, the CINRAD network can monitor almost the entire Guangdong Province at height of 2 -3 km AGL and 3-5 km above MSL, thus, the distribution of radar is relatively good in Guangdong Province. |
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| Keywords: | China next generation weather radar DEM terrain blockage radar coverage scan method |
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