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首页> 外文期刊>Journal of the American Water Resources Association >A COMPARISON OF GAUGE AND RADAR-DERIVED RAINFALL IN A LAND FALLING TYPHOON IN TAIWAN
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A COMPARISON OF GAUGE AND RADAR-DERIVED RAINFALL IN A LAND FALLING TYPHOON IN TAIWAN

机译：台湾陆上登陆台风的雨量计和雷达降雨比较

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摘要

Precipitation data is generally collected from rain gauge stations. However, each measurement represents only the amount of rainfall at that particular spot, not precipitation in the surrounding area. Radar approaches are considered to offer a good spatial description of precipitation, but hardly predict precipitation quantities with acceptable accuracy. To enhance our understanding of the properties of precipitation in this study, high resolution radar-rainfall estimates are compared with ground observations for an extreme precipitation event. The Taipei City area and the Shihmen reservoir watershed, situated in northern Taiwan, were chosen as the study sites, and the passage of Typhoon Nari through these areas on September 16-18, 2001, was taken as the case study event. It was concluded that radar reflectivity from the Wufenshan radar station can be helpful for identifying precipitation variations during the passage of a land falling tropical cyclone. Spots with extreme rainfall can be identified when radar approaches are performed, but not based on gauge approaches, although compared to the gauge approaches to the radar-estimated rainfall over the investigated domain tended to be overestimated. The divergence between radar-rainfall and gauge-rainfall can be identified via subwater-shed investigations.
机译：通常从雨量计站收集降水数据。但是，每次测量仅代表该特定点的降雨量，而不代表周围地区的降雨量。雷达方法被认为可以很好地描述降水，但是很难以可接受的精度预测降水量。为了增强我们对本研究中降水性质的理解，将高分辨率雷达降雨估计值与极端降水事件的地面观测结果进行了比较。研究地点位于台湾北部的台北市地区和石门水库集水区，并以2001年9月16日至18日通过台风纳里河为例。得出的结论是，五分山雷达站的雷达反射率可有助于识别降落的热带气旋通过期间的降水变化。雷达执行时可以识别出极端降雨的地点，但不是基于量规方法，尽管与标量方法相比，研究范围内雷达估算的降雨往往被高估了。雷达雨量和雨量雨量之间的差异可以通过水下流域调查确定。

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