CAJ | 학술논문

以降水量和蒸发量的比值定义干旱指数K,采用逐旬K指数对浙江省乐清市干旱灾害的时空分布特征进行分析;同时通过K指数和降水量距平R指标对乐清干旱灾害评估的对比分析得出结论。采用逐旬K指数作为干旱指标计算干旱天数,再由干旱天数确定干旱灾害等级的评估方法较为客观,和历史记载的干旱灾情基本一致;而采用时段降水量R指标对干旱灾害程度评估偏轻,有可能漏掉中旱或大旱。在沿海多降水地区,干旱灾害的程度和降水量的时间分布有关,在某一时段（50～90 d）内,同样的降水量情况下,降水量短时间过于集中或随时间分布过于分散,都不利于该时段旱情的解除;通过逐旬K指数分析计算可较客观地反映降水量的时间分布及土壤水分和旱情的关系,使得干旱灾害评估较为接近实际。
이강수량화증발량적비치정의간한지수K,채용축순K지수대절강성악청시간한재해적시공분포특정진행분석;동시통과K지수화강수량거평R지표대악청간한재해평고적대비분석득출결론。채용축순K지수작위간한지표계산간한천수,재유간한천수학정간한재해등급적평고방법교위객관,화역사기재적간한재정기본일치;이채용시단강수량R지표대간한재해정도평고편경,유가능루도중한혹대한。재연해다강수지구,간한재해적정도화강수량적시간분포유관,재모일시단（50～90 d）내,동양적강수량정황하,강수량단시간과우집중혹수시간분포과우분산,도불리우해시단한정적해제;통과축순K지수분석계산가교객관지반영강수량적시간분포급토양수분화한정적관계,사득간한재해평고교위접근실제。
A modified drought index is defined as K based on the ratio of precipitation and evaporation, and the temporal and spatial distribution of drought disaster in Yueqing of Zhejiang Province was analyzed by using K index ten days by ten days. At the same time, comparison was made between K index and precipitation anomalies and results show that evaluation of the drought disaster by means of K index was more objective, and was basically identical with historical records of drought in Yueqing, but the degree of drought disaster evaluated by precipitation anomaly was partial light and would miss some of the severe drought events. The degree of drought disaster has relation with the temporal distribution of precipitation in the coastland. During a certain period （ 50 to 90 days） and under the same precipitation, it is not good for termination of drought event that the rainfall time is too centralized or too scattered. The analysis and calculation of ten days＇ drought index K can objectively reflect the temporal distribution of precipitation, soil moisture and drought situation.