基于Z指数的延边朝鲜族自治州各县市年际旱涝特征分析

Analysis of time characteristics of drought and flood in annual city of Yanbian based on Zindex

对延边朝鲜族自治州8个县市1960—2009年逐月降水资料进行Z指数分析.研究结果表明:延边朝鲜族自治州8个县市易发生旱涝灾害事件,其中:延吉市和珲春市属于正常型区域,延吉市发生旱涝灾害的周期为4年和7年,珲春市发生旱涝灾害的周期为3年;安图县和图们市属于偏涝型区域,安图县发生旱涝灾害的周期为4年,图们市发生旱涝灾害的周期为3年和7年;敦化市、汪清县、和龙市和龙井市属于偏旱区域,且敦化市、汪清县、龙井市和和龙市发生旱涝周期灾害的周期分别为5年和7年、3年、7年、5年.延边朝鲜族自治州8个县市均易发生连续性旱涝灾害事件,且各地区连续性旱涝灾害出现的时间间隔和连续时间有所差异.

This paper analyze the Yanbian area＇s 8 cities in 1960-2009 monthly rainfall observation data based on Z index. The research shows that every city happens drought and flood disasters. Yanji and Hunchun belongs to normal areas, and Yanji＇s drought and flood disasters peird is 4 years and 7 years. Hunchun＇ s drought and flood disasters have the time cycle of 3 years. Antu and Tureen belongs to the type of flood areas. Antu＇s drought and flood disasters peird is 4 years. Tumen＇ s drought and flood disasters is 3 years and 7 years. Dunhua, Wangqing, Helong, and Longjing belongs to the type of drought areas. Dunhua＇s drought and flood disasters peird is 5 years and 7 years. Wangqing＇s drought and flood disasters have the time cycle of 3 years. Longjing＇s drought and flood disasters peird is 7 years. Helong＇s drought and flood disasters have the time cycle of 5 years. The continuing drought and flood disasters easily occur in erery city, and peird of continuing drought and flood disasters and the continuous time are different.