提高最优插值法测量区域降水量精度的探讨

A Study of Improving Precision of Measuring Regional Precipitation in Optimum Interpolation Method

首先从理论上研究了要素场相关函数和校准雨量站的分布对最优插值中最优权重系数的影响 ,然后用 3种相关函数模型对 1996～ 1997年收集的 113个时次的雷达和雨量计资料进行计算、检验。结果表明 :采用自适应相关函数模型的最优校准法可以有效提高区域降水量的测量精度。另外 ,通过对大误差的产生原因分析 ,给出合理设置自动雨量站的建议和解决边界测量精度较低的方法。

We firstly studied influence of power coefficients in optimum interpolation by correlation function of element field and distribution of gauge Then three correlation function models were used to calculate 113-hour data of radar and gauge The result show: the adaptive correlation functions model can far more develop precision of measuring regional precipitation With analysis of the cause of large errors, we finally gave suggestion of setting automatic gauges and method of solving lower precision on boundary