知识与财富的链接
利用我国近５００年旱涝等级史料和新中国４０多年实测雨量资料,采用天气、气候、统计学方法,对南水北调中线各段区域性干旱、插花（局地）干旱及持续性干旱等３类干旱进行了分型研究,提出了其地理分布特点,为提高南水北调的效益、合理使用水源提供了依据。
By use of data 526 years drought and flood historical and 45 years rainfall data in China, the regional/scattering drought and sonsistent drought of each part along the mid-line of water transfer from South to North China are classified, and the geographical distribution features are shown also, that may give some suggestions for the reasonable use of water-resources from South to North China
