1.The results showed that the annual ET_0 calculated by Penman method was a little higher than that obtained by Penman-Monteith method. The absolute deviation of yearly ET_0 between the two methods was 42~128 mm, the yearly relative deviation was 3.3%~9.8%. The difference of monthly ET_0 was smaller.
Penman修正式计算的参考作物潜在腾发量年值略大于Penman-Monteith公式计算的年值,绝对偏差为42～128mm,相对偏差为3.3～9.8%,且年际间变化不大。
2.NOAA/AVHRR and DEM(Digital Elevation Model) together with the measured meteorological data are applied to modify Penman Formula. And the monthly potential evapotranspiration of Yarlung Tsangpo River Basin is calculated with the modified Penman Formula.
文中用NOAA数据、DEM数据结合实测气象数据对Penman公式进行修正,再用修正后的Penman公式计算雅鲁藏布江流域潜在蒸散量。
3.In this paper,the author evaluates several kinds of computing crop water requirement methods through analyzing its accurate and applicable condition,compares Modify Penman with Penman Monteith Formula which are both the main mathematical models that FAO recommended to compute crop actual evapotranspiration,then discusses defect in drawing out irrigation schedule by field capacity. At last introduce a new way by means of using computer software Spreadsheets to replace conventional BASIC program working out irrigation schedule.
综合评价各种作物需水量计算方法的精度和适用条件 ,对比联合国粮农组织推荐的两种主要作物需水量计算方法 ,修正Penman法和 Penman-Monteith方程 ,分析田间持水率作为编制灌溉计划的重要指标所存在的缺陷 ,最后介绍采用电子表格软件手段代替传统 BASIC语言进行灌溉制度设计的程序化处理的方法。
4.Modified Penman and Penman Monteith formulae were recommended to calculate the reference crop evapotranspiration by FAO one after another.
FAO先后建议用Penman修正式和Penman Monteith公式计算参考作物蒸散量 .
5.The differences in ET r estimates between FAO Penman Monteith and Penman and FAO Blaney Criddle methods were obviously lower than those between FAO Penman Monteith and Makkink and Priestley Taylor methods.
与FAOPenman Monteith公式的计算结果相比较 ,用Penman公式和FAO 2 4Blaney Criddle公式估算奈曼地区参考作物蒸散量误差较小 ;
6.The crop reference evapotranspiration, estimated from meteorological data with methods such as the Penman-Monteith method recommended by FAO, is useful for precision irrigation decision-making.
在估算大气蒸发力方面,以参考作物蒸散量为指标,估计作物参考蒸散量的方法以联合国粮农组织(FAO)最新推荐的Penman Monteith方法较为精细。
7.Penman Monteith equation was used to compute daily ET0 for five stations: Dali,Yuanjiang,Baoshan,Kunming,and Jinghong,based on the history meteorological data range from 46 to 48 years,and monthly ET0 series of the other 25 meteorological stations from 1961 to 2000.The most important influence factor of daily ET0 is daily maximum temperature.
以Penman Montieth方程分析了西南纵向岭谷区大理、元江、保山、昆明、景洪站46~48年的逐日ET0及其余25个站1961~2000年逐月ET0系列。
8.Influence of e_a on calculation of reference crop evapotranspiration with Penman-Monteith formula
不同e_a计算方法对Penman-Monteith公式的影响
9.With FAO irrigation and drainage series books 56th part Penman-Monteith formula, computation program of ET0 had been developed about day and month as time unit, and ET value would be known while giving crop coefficient Kc.
运用FAO灌溉排水丛书第56 分册提供的Penman-Monteith公式,编制了以日和月为时间单位的计算ET0 程序,通过调用Kc参数表,可计算出ET;
10.Based on the meteorological data collected from 3 stations in recent 10 years in Fushun region,the reference crop evapotranspiration(ET_0) was calculated with the Penman-Monteith equation recommended by FAO in 1990.The ET_0 of the region was analyzed using linear regression analysis based on software of SPSS.
根据抚顺地区3个气象站的气象观测资料,应用1990年联合国粮农组织推荐的Penman-Monteith公式计算各站1995~2004年10年来的参考作物需水量ET0。 利用SPSS统计分析软件对ET0进行回归分析。
