嘉陵江流域近50年降水量演变规律分析 | |
其他题名 | Analysis on the Trend of Precipitation in Jialing River Basin Nearly 50Years |
段文明; 穆兴民; 高鹏; 王飞; 白桦 | |
2012 | |
发表期刊 | 水土保持研究 |
卷号 | 19期号:01页码:97-101 |
摘要 | 利用嘉陵江流域12个气象站点的1960—2009年降雨实测资料,采用地统计学和时间序列等方法,分析了嘉陵江流域近50a降水量时空变化特征,为旱涝、泥石流等自然灾害的防治提供依据。结果表明:流域内年平均降水量910.5mm,降水量由东南到西北逐渐递减;近50a来降水量总体上呈减少趋势,流域整体处于一个丰—平—枯的降水阶段;降水量的周期性比较明显,存在35a、21a尺度的周期;年内降水量具有季节性变化,降水量主要集中在5—9月,占全年降水量的80%左右,春、秋季降水量有减少趋势,流域夏季降水量除渠江有增加趋势外都有减少趋势,冬季变化趋势不明显;近50a来降水量以正常年份居多,降水偏多年份多于偏少年份。通过分析虽年降水量有减少的趋势,但年内降水量却相对集中于夏秋季,因此仍要做好汛期的洪涝、水土流失等灾害的防治,以及春冬季的抗旱工作。; This paper analyzes the spatio-temporal variation of precipitation using the monthly precipitation data from 12meteorological stations during the period of 1960—2009based on geostatistics and time series analysis methods,which can serve as the convincing evidences for combating drought and flood,debris flow and other natural disasters.The results indicate that:the average annual precipitation is about 910.5mm, which has a decreasing gradient from southeast to northwest in the Jialingjiang River Basin.The precipitation shows downward trend in the last 50years in the catchment,and has periodical features of 21and 35years. The precipitation has a rainy-normal-drier period in the last 50years.The precipitation presents seasonal dynamics during the whole year,and mainly concentrated in the period of May to September,accounting for approximately 80%of annual rainfall.In addition,precipitation in spring and autumn demonstrates decreasing trends.In summer,most stations show downward trends except Qujiang River with an increasing trend, however,there is no significant trend for precipitation in winter.Nearly fifty years,the majority of rainfall occurred in a normal year,the rainy year was more common than drier year.Through the study,there is a decreasing trend in annual precipitation,but it is relatively concentrated in the summer and autumn through the year.Therefore,we should take some measures to prevent the floods,soil erosion or other disasters in flood season and take some measures to prevent drought in spring and winter too. |
关键词 | 嘉陵江流域 :jailing river basin 降雨量 Precipitation 时空变化 Spatio-temporal variation |
语种 | 中文 |
文献类型 | 期刊论文 |
条目标识符 | sbir.nwafu.edu.cn/handle/361005/5297 |
专题 | 水保所知识产出(1956---) |
推荐引用方式 GB/T 7714 | 段文明,穆兴民,高鹏,等. 嘉陵江流域近50年降水量演变规律分析[J]. 水土保持研究,2012,19(01):97-101. |
APA | 段文明,穆兴民,高鹏,王飞,&白桦.(2012).嘉陵江流域近50年降水量演变规律分析.水土保持研究,19(01),97-101. |
MLA | 段文明,et al."嘉陵江流域近50年降水量演变规律分析".水土保持研究 19.01(2012):97-101. |
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