1981-2020年南宁市水文干旱评价

Evaluation of hydrological drought in Nanning City from 1981 to 2020

干旱作为一种复杂的自然灾害,以多种方式影响社会生态系统和人类生活环境,其中许多影响与水文干旱密切相关,因此,了解水文干旱的发展和恢复至关重要。利用南宁市4个水文站40年(1981-2020年)的流量数据,采用标准化径流指数(SRI),研究了南宁市近40年的水文干旱演变特征,结果表明:过去40年,南宁市水文干旱存在减弱的趋势,趋势为0.002/10年;上林、邹圩、南宁以及镇龙水文站水文干旱的频率依次为33.96%、33.33%、33.13%和32.29%,最旱的年份分别为1988年、1991年、1988年和2020年。

As a complex natural disaster,drought affects socio-ecological systems and human living environments in multiple ways,of which many impacts are closely related to hydrological droughts.Therefore,it is crucial to under-stand the development and recovery of hydrological droughts.Based on the flow data of 40 years from 1981 to 2020 from the four hydrological stations in Nanning City,the standardized runoff index(SRI)was adopted to study the evo-lution characteristics of hydrological drought in Nanning in nearly 40 years.The results of study demonstrate that in the past 40 years,the hydrological drought in Nanning showed a decreasing trend of 0.002/10 years;the frequencies of hydrological droughts for the four hydrological stations of Shanglin,Zouxu,Nanning and Zhenlong are 33.96%,33.33%,33.13%and 32.29%,and the driest years are 1988,1991,1988 and 2020 respectively.