CAJ | 학술논문

应用雷达低仰角基本反射率资料和地面加密自动站降水量资料,采用最优化方法,根据天津地区降水特点和不同降水类型,建立适用本地的雷达Z-I关系。经实际应用检验,积混降水类型Z-I关系具实用性。在天津本地化Z-I关系基础上,通过了对比分析6种不同校准方法在天津夏季降水估测中的检验效果。结果表明：Z-I关系校准法和最大集成法对降水的估测偏高,误差较大;最优插值法的估测精度最高,平均绝对误差和均方根误差最小;但计算不同校准方法与实况相关性表明,变分校准法的估测效果与雨量计降水量的相关性最好。同时,所有估测校准法对小雨量级的降水均出现了不同程度的偏高估测。
응용뢰체저앙각기본반사솔자료화지면가밀자동참강수량자료,채용최우화방법,근거천진지구강수특점화불동강수류형,건립괄용본지적뢰체Z-I관계。경실제응용검험,적혼강수류형Z-I관계구실용성。재천진본지화Z-I관계기출상,통과료대비분석6충불동교준방법재천진하계강수고측중적검험효과。결과표명：Z-I관계교준법화최대집성법대강수적고측편고,오차교대;최우삽치법적고측정도최고,평균절대오차화균방근오차최소;단계산불동교준방법여실황상관성표명,변분교준법적고측효과여우량계강수량적상관성최호。동시,소유고측교준법대소우량급적강수균출현료불동정도적편고고측。
Based on the observational data from the low-elevation angle radar and precipitation data from intensive automatic weather station,the local Z-I relationships were established by an optimization method according to precipitation feature and the different precipitation types.According to application test,the Z-I relationship of the cumulus clouds mixed precipitation type is more applicable.The results of precipitation estimated using six calibration methods were compared after the Z-I relationships have been modified specifically for Tianjin area.The results indicate that the errors from both the Z-I relationship calibration method and the maximum integrated method are large;they both overestimate rainfall.The estimation accuracy of the optimal interpolation method is the highest among the all methods,and its mean absolute error and root-mean-square error are the smallest.The correlation coefficient between the estimated rainfall from different methods and the observed rainfall are calculated,and it shows that the correlation between the estimated rainfall of variational calibration method and rain gauge rainfall is significant.To some extent,the rainfall is overestimated to light rain grade among the all methods.