基于SWAP和SRI的汉江流域旱涝急转时空特征分析  

Spatio-temporal variations of drought-flood abrupt alternation events in Hanjiang River Basin based on SWAP and SRI

作　　者：赵英 陈华[1] 杨家伟 许崇育 陈杰[1] ZHAO Ying;CHEN Hua;YANG Jiawei;XU Chongyu;CHEN Jie(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《人民长江》2020年第4期94-99,151,共7页Yangtze River

基　　金：国家自然科学基金重点项目(51539009)。

摘　　要：汉江流域受亚热带季风影响,易旱易涝,旱涝急转事件时有发生,灾害突发、抢险难度大,对社会发展易造成重大威胁。以汉江流域为研究对象,采用SWAP和SRI指数分析和研究汉江流域的旱涝演变及旱涝急转变化规律。结果表明:①SWAP和SRI指数均能对旱涝急转事件作出合理诊断,具有良好的适用性。②干旱及旱涝急转事件频次均呈现从汉江上游的西北地区到下游的东南地区先逐渐减少后增加的趋势;洪涝事件频次呈从北到南逐渐增加的趋势;旱涝急转事件平均强度呈现从上游的西北地区到下游的东南地区逐渐增大的趋势。③干旱事件在任意时间段均可能发生,洪涝事件和旱涝急转事件主要集中在夏季,且旱涝急转事件发生的时间短且急,强度较高,更具威胁性。The drought-flood abrupt alternation events,caused by the subtropical monsoon climate,occur frequently in the Hanjiang River Basin,which have negative impacts on the economic and social development.Therefore,we adopted the SWAP and SRI to analyze the characteristics of the drought-flood abrupt alternation events in the Hanjiang River Basin.The results show that:(1)The SWAP and SRI have good applicability to identify the drought-flood abrupt alternation events.(2)From the northwest part of upstream to the southeast part of downstream in the Basin,both the frequencies of the droughts and the drought-flood abrupt alternation events decreased first then increased.The average intensity of the drought-flood abrupt alternation events presents an increasing trend.From north to south of the Basin,the frequencies of floods show an increasing trend.(3)The droughts can occur at any time,while most floods and the drought-flood abrupt alternation events occur in the summer.Moreover,the drought-flood abrupt alternation events are usually serious and risky.

关 键 词：旱涝急转 时空特征 水文极端事件 SWAP指数 SRI指数 汉江流域 

分 类 号：P339[天文地球—水文科学]