Estimation of Areal Rainfall Using the Radar Echo Area Time Integral
Estimation of Areal Rainfall Using the Radar Echo Area Time Integral
复制标题
利用雷达回波区域时间积分估算区域降雨量
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
D. Rosenfeld
中科院分区：
文献类型：
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作者：
R. López;David O. Blanchard;R. Holle;Jack L. Thomas;D. Atlas;D. Rosenfeld
本文将Doneaud等人的面积时间积分(ATI)方法和Atlas等人的瞬时区域降雨量方法推广到测量长达12小时的区域范围内的累积降雨量。数据库是佛罗里达地区积云试验(FACE)II三个夏季的雷达和雨量网络资料。对于12小时的累积，V，在3.6×104平方公里的面积上，雷达推算雨量与气象指数的相关系数为0.92，回归直线V/(Ati)的斜率为3.4 mm h−~1。在1.5×10~4km2的面积上，密度为1/11km2的测网，相关系数降至0.84，仍足以证实气象指数方法的有效性。此外，V/(ATI)斜率随测点的增加而减小至2.6mmh−1。这种相关性的降低主要是由于异常传播错误地增加了风暴面积，以及…
Abstract This work extends the Area Time Integral (ATI) method of Doneaud et al., developed for the lifetime rainfall from an individual storm, and the instantaneous areawide rainfall method of Atlas et al., to the measurement of the cumulative areawide rainfall for periods up to 12 h. The database is the radar and rainfall network data for the three summers of the Florida Area Cumulus Experiment (FACE) II. For 12-h accumulations, V, over the area of 3.6 × 104 km2, we find correlations of 0.92 between radar deduced rainfall and ATI where the latter is computed at intervals from 5 min up to 1 h. The slope of the regression line V/(ATI) is 3.4 mm h−1. Using a gage network with density of 1/11 km2 over an area 1.5 × 104 km2 the correlation coefficient drops to 0.84, still sufficiently high to confirm the validity of the ATI approach. Also, with the gages the V/(ATI) slope decreases to 2.6 mm h−1. The decrease in the correlation is due largely to anomalous propagation which falsely increases storm areas, and ...