赣江流域旱涝时空变化特征研究_张余庆

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第35卷第3期气象科学Vol.35,No.3 2015年6月Journal of the Meteorological Sciences Jun.,2015张余庆,项瑛,陈昌春,等.赣江流域旱涝时空变化特征研究.气象科学,2015,35(3):346-352.

ZHANG Yuqing,XIANG Ying,CHEN Changchun,et al.Research on spatial-temporal variation of drought and flood events over Ganjiang basin.Journal of the Meteorological Sciences,2015,35(3):346-352.doi:10.3969/2014jms.0010

赣江流域旱涝时空变化特征研究

张余庆1项瑛2陈昌春3危润初4

(1南京信息工程大学大气科学学院,南京210044;2江苏省气候中心,南京210009;

3南京信息工程大学地理遥感学院,南京210044;

4吉林大学地下水资源与环境教育部重点实验室,长春130021)

摘要基于赣江流域40个气象站点1966—2005年的月降水、气温资料,采用多时间尺度的标准化降水蒸散指数反映不同时间尺度的旱涝状况。再应用小波分析和GIS空间分析技术,对其旱涝特征进行定量化分析,阐述其时空变化格局。结果表明:40a共出现6次中旱以上级别的干旱事件,7次中涝以上级别的雨涝事件。在流域旱涝演变过程中主要存在3类尺度的周期变化规律。

通过小波方差检验得出10a时间尺度的周期振荡最强烈,为该指数时间变化的第一主周期。重涝主要分布在赣江流域南部,而重旱主要分布在西南地区。季节性旱涝变化以夏涝最为严重,主要分布在流域总出口,即南昌、丰城一带,而伏旱、秋旱波及范围较大,持续时间较长。

关键词旱涝;标准化蒸散指数;小波分析;

分类号:P426.616doi:10.3969/2014jms.0010文献标识码:B

Research on spatial-temporal variation of drought and

flood events over Ganjiang basin

ZHANG Yuqing1XIANG Ying2CHEN Changchun3WEIRunchu4(1School of Atmospheric Science,Nanjing University of Information Science&Technology,Nanjing210044,China;

2Jiangsu Climatic Center,Nanjing210009,China;

3School of Gegoraphy andRemote Sensing,Nanjing University of Information Science&Technology,Nanjing210044,China;4Key Laboratory of GroundwaterResources and Environment of Ministry of Education,

Jilin University,Changchun130021,China)

Abstract Based on the monthly precipitation and temperature data from40meteorological stations in Ganjiang basin during1966—2005,the Standardized Precipitation Evapotranspiration Index(SPEI)at different time scales is used to reflect the status of drought and flood event at different time scales,the temporal-spatial patterns of drought and flood events are analyzed with wavelet analysis and GIS spatial technology.The results show that the drought and flood events above moderate level during the past40 years occurred6and7times,respectively.In the evolution process of the drought and flood in the basin,three main periodic changes existed.Verification from wavelet variance suggests that periodic oscillation around10years is the most intense,which is the first main cycle of the long term change over Ganjiang basin.Heavy flood events areas are mainly in the southern Ganjiang basin,while the heavy droughts pri-marily happen in the southwest region.Flood events in summer is the most serious and located in the out-let of the Ganjiang basin near Nanchang and Fengcheng.However,droughts in summer and autumn dis-

收稿日期(Received):2013-09-12;修改稿日期(Revised):2014-01-04;网络出版日期(Published on-line):2015-03-30

网络出版地址:http://www.cnki.net/kcms/detail/32.1243.P.20150330.1454.001.html

基金项目:中国气象局气候变化专项(CCSF201319)

通信作者(Corresponding author):项瑛(XIANG Ying).jsqxxy@163.com

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