If a dry year, very wet year, or a severe winter occurs, they may die . 如遇上旱年，涝年或冬季严寒，它们就可能死亡。
2.
Measures of decreasing lose of drought in dry year in semi - arid area 半干旱区旱年减灾增产措施
3.
Last year was the third driest on record ; drier than 1976 , when water companies had to put standpipes in the streets 如此少的降水也让去年成为了英国历史上第3大干旱年，其干旱严重程度甚至超过了大旱的1976年。
4.
Britain ' s biggest water company is expected to announce the first hosepipe ban of the year tomorrow as the country ' s drought reaches crisis levels 如此少的降水也让去年成为了英国历史上第3大干旱年，其干旱严重程度甚至超过了大旱的1976年。
5.
And the 30 - 60 day low - frequency character is more distinct in flood years than in drought years ; ( 2 ) the relationship of low - frequency olr and zonal wind is greatly different in drought years and flood years 重点研究的旱、涝各4个年份的分析结果表明，涝年olr场的30 60天振荡比旱年更为显著。
6.
In the fifty years the summer rainfall of north china has seven serious flood years and eight serious drought years , of which 1956 and 1963 are the unusual flood years and 1997 is the unusual drought year 近50年里华北夏季严重涝年有7年，其中1956年和1963年为异常涝年；严重旱年有8年，其中1997年为异常旱年。
7.
There are low frequency vortex moves northward at low - latitude and southward at mid - latitude ; there are low frequency vortex moves northward at low - latitude and southwestward at mid - latitude in flood years , it ' s easily to bring on convergence or divergence in large - scale and heave rainfall ( 3 )涝年低频olr在经向上同时存在由低纬度向北和由中高纬向南的传播，二者交汇在20 30 n之间。旱年则没有显著的汇合区。
8.
Abstract : monthly rainfall data from 1951 to 1995 for june , july and august in 13 meteorological stations of the north china were used for accounting z index and discussing serious flood and drought featureas in these months . serious flood mainly happened in july and august , and sevious drought mainly happened in august . there were more flood in 1950 ' s to 1960 ' s and more drought since 1970 ' s in the north china . meanwhile , the deeper trough which covered the regions from the ural mts . to the balkhash lake play an important role in serious rainstom in rainy season in the north china . there often happened serious flood ( drought ) when the northwester pacific subtropical high was by west and north ( east and south ) , and the sea surface temperature in the equatorial central and eastern pacific was mainly in dropping ( raising ) stage 文摘:利用华北平原地区的13个站点, 45年（ 1951 1995 )的降水资料,对夏季4个时段（ 6月、 7月、 8月、 6 8月）进行了z指数计算,确定了该地区各个时段的严重涝年和严重旱年.发现华北地区雨季的严重洪涝主要集中在7 , 8月,严重干旱则主要发生在8月,并可明显看出由50 60年代的多水期向70年代中期以后的少水期的转变,另外,乌拉尔山到巴尔喀什湖附近的低压槽加深和西北太平洋副热带高压的北抬,对华北地区雨季持续性暴雨的产生起着决定性的作用.严重洪涝年的夏季（ 6 8月） ,西北太平洋副热带高压偏西、偏北,赤道东太平洋海温多处于下降阶段;严重干旱年西北太平洋副高偏东、偏南,赤道东太平洋海温则处于上升阶段
9.
Longitude circulations exist in the soohpa height fields in wet . springs and latitude circulations exist in dry springs . the composite : differences of the atmospheric circulation exist in wet springs and dry springs , which appears to be the eu teleconnection pattern of the general circulation 结果表明，山东省春季涝年与旱年的环流形势存在明显的差异：异常多雨年，贝加尔湖以西的广大中高纬地区高度场降低，我国东部到日本的高度场明显升高，亚洲中高纬地区呈现纬向环流。
10.
It was found that the " key regions " from which moisture transports influenced shandong summer rainfall lies in tropical india ocean , south china sea to tropical west pacific , china mainland to japan sea and the upstream area in westerly belt by analysis of svd method on water vapor transport 夏旱年则相反。通过对旱涝年水汽输送与山东夏季降水的相关分析，山东夏季降水和水汽输送svd分析，发现：影响山东夏季降水的水汽输送“关键区”主要位于热带印度洋、南海-西太平洋、中国大陆-日本海以及山东上游西风带地区。
