摘要
采用P-Ⅲ型频率曲线、一元线性回归、降水量模比系数差积曲线、滑动平均、Morlet小波分析等方法,分析了长子县降水变化特征。研究结果如下:研究区多年平均降水量总体呈下降趋势,特别是80年代初到90年代降水量下降明显;长时间序列上降水量有完整的丰平枯周期,22年周期上的峰值最大;多年平均月降水量分配呈单峰型,主要集中在汛期6-9月份。成果可为研究区水文预报提供一定依据。
The characteristics of precipitation changes in Zhangzi County were analyzed using methods such as P-Ⅲfrequency curve,one-variable linear regression,precipitation ratio coefficient difference product curve,moving average,and Morlet wavelet analysis.The results of the study are as follows:The multi-year average precipitation in the study area has shown a downward trend in general,especially from the early 1980s to the 1990s;The precipitation has a more or less cycle in the long-term series,and the variance is the largest in the 22-year cycle;The multi-year average monthly precipitation distribution is unimodal,mainly accounted in flood season 6-9 month.This study can provide a basis for hydrological forecasting.
作者
张娇娇
Zhang Jiaojiao(ChangZhi Hydrological and Water Resources Survey Station)
出处
《山西水土保持科技》
2021年第2期7-10,28,共5页
Soil and Water Conservation Science and Technology in Shanxi
关键词
降水量
丰平枯分析
周期性分析
变化特征
Precipitation
Abundance
More Or Less Cycle Analysis
Periodic Analysis
Variation Characteristics
