基于DEM的甘肃省降水资源分析  

Analysis of precipitation in Gansu Province based on DEM

作　　者：张旭东[1,2] 辛吉武[3] 王润元[1] 尹东[4] 

机构地区：[1]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]兰州区域气候中心,甘肃兰州730020 [3]海南省气象局,海南海口570203 [4]甘肃省气象局,甘肃兰州730020

出　　处：《干旱地区农业研究》2009年第5期1-5,共5页Agricultural Research in the Arid Areas

基　　金：公益性行业(气象)科研专项项目(GYHY200806021);甘肃省科技攻关计划项目"基于3S技术的甘肃省河东地区特种作物气候生态研究"

摘　　要：对甘肃省80个气象站近30a（1971～2000）的降水量资料，利用地理信息系统（CIS）技术进行数据栅格化，采用趋势面分析、逐步回归、宏观地理因子模拟与小地形订正等方法，建立全省降水空间分布的数学模型。从推算结果看：甘肃省降水资源分布差异很大，从100mm以下到800mm以上均有分布，而且基本上呈现由东南向西北逐级减少的趋势；甘肃省干旱区（r〈300mm）面积最大，达到184144．01km^2，占到全省面积的46．6％。Based on precipitation data of 80 meteorological observation stations in Gansu Province in the latest 30 years （1971 - 2000）, the geographic information system （GIS） method was used to rasterize the data. The results showed that the mathematic model about precipitation space distribution in the whole province built by the methods of stepwise regression, macro geographical factors simulation and revision of little topographic influence and etc. has the characteristic of less error. The average relative error was 1.5 %. The calculated result indicated that the difference of precipitation resources distribution in Gansu Province was very big over a wide range from 100 mm to 800 mm, which displayed a tendency of decreasing mainly from southeast to northwest. The arid area （r 〈 300 mm） was 184 144.01 km^2 in Gansu Province, accounting for 46.6 % of the province＇ s whole area.

关 键 词：降水 DEM 甘肃 

分 类 号：S161.6[农业科学—农业气象学]