论文部分内容阅读
利用Penman Monteith方程计算并分析了山西洪洞、山东陡山、广西桂林、湖北漳河、云南景洪及昆明等国内6个不同经纬度和海拔站点16~31年不同长度系列的逐日ET0变化规律,将过去按旬统计的天气类型修正系数缩短到逐日,引入基于Zadeh算子的模糊隶属函数,进行天气类型修正系数的模糊集运算判别。改进的数学模型在昆明和景洪两个灌区分别用于2000年和1998年逐日ET0预测的结果表明,预测精度较此前的径向基函数法和年际均值校正法分别提高18.9%和10%以上。
The Penman Monteith equation was used to calculate and analyze the daily ET0 variation of different length series from 16 to 31 years in Hongdong, Shanxi, Guilin, Zhanghe, Hubei, Jinghong and Kunming in Shanxi Province. In the past, the weather type correction coefficient of the past ten days was shortened to day by day. The fuzzy membership function based on Zadeh operator was introduced to discriminate the fuzzy sets of weather type correction coefficients. The improved mathematic model for daily ET0 prediction in 2000 and 1998 respectively in Kunming and Jinghong irrigation areas shows that the prediction accuracy is 18.9% and 10% higher than the previous radial basis function method and interannual average correction method, respectively. the above.