摘要
根据雷州半岛13个雨量站1970—2013年的月降水量资料,利用定义的长短周期降雨旱涝急转指数分析雷州半岛长周期和短周期汛期降雨旱涝急转现象的时间演变趋势,结果表明：1高LDFAI和高SDFAI反映降雨的旱转涝趋势,低LDFAI和低SDFAI则对应降雨的涝转旱,SDFAI在显示旱涝急转时优于LDFAI。2雷州半岛长周期降雨旱涝急转主要是以全旱为主,其次是全涝,旱转涝与涝转旱相当。35个短周期时段的降雨旱涝急转发生频率最高的均是全旱,其次是涝转旱和旱转涝;4月15日~6月15日的全旱发生频率高于其他短周期。
Based on monthly precipitation data from 13 rainfall gauging stations covering 1970- 2013 in the Leizhou Peninsula,the immediate flood-drought shift,e. g. shift from drought to flood and vice versa,was analyzed for flooding season with long-cycle drought-flood abrupt alternation index（ LDFAI in short） and short-cycle drought-flood abrupt alternation index（ SDFAI in short）.The major results are： 1 the high LDFAI and SDFAI can well describe the drought-to- flood shifts,while the low LDFAI and SDFAI can well describe the flood-to-drought shifts. SDFAI has better performance when compared to LDFAI with respect to description of drought-flood abrupt alternation. 2 LDFAI shows the highest probability of drought,followed by the flood,flood-todrought shifts and drought-to-flood shifts. 3 The highest probability of floods can be detected in five short-cycle times of flooding season,followed by the flood-to-drought shifts and drought-to-flood shifts. The droughts are subject to higher frequency during periods of April 15 to June 15 when compared to other short-cycle times.
出处
《广东水利水电》
2015年第2期17-20,共4页
Guangdong Water Resources and Hydropower
关键词
旱涝急转
时间演变趋势
雷州半岛
drought-flood abrupt alternation
temporal variation
Leizhou Peninsula
作者简介
张胜华（1986），女，硕士，工程师，从事水文分析计算及水资源评价工作。
