%0 Journal Article
%T Reference Crop Evapotranspiration Calculation in Short Interval of Mountainous Area in North China<br>华北山区短时段参考作物蒸散量的计算
%A YANG Cong
%A YU Jingjie
%A SONG Xianfang
%A XIA Jun
%A LIU Changming
%A <br>杨聪
%A 于静洁
%A 宋献方
%A 夏军
%A 刘昌明
%J 地理科学进展
%D 2004
%I 
%X It is important to estimate the reference crop evapotranspiration (ET0) in short inter val not only to meet the need of real time flood forecast and agrometeorology forecast but also to accelerate researches on water cycle and transfer in small catchment in North China. Limited by the observing apparatus and local geographical condition, the studies of the reference crop evapotranspiration in short interval have rarely been done in semi-humid and semi-arid mountainous area of North China. With four representative months (Aug. 2003, Nov. 2003, Feb. 2004, May 2004) detail data from standard automatic weather station in an experimental catchment named as Dongtaigou, daily ET0 is calculated by FAO Penman-Monteith equation(ET0(P-M)),FAO Penman equation(ET0(P)), and Priestley-Taylor equation(ET0(P-T)), respectively. The results show that the average calculated value from ET0(P) is 16% higher than that from ET0(P-M). And two sets of calculated data have a very good correlation. Multiplying a constant (e.g. 0.84), the ET0 calculated by ET0(P) in the experimental catchment is approximatively equal to the value from ET0(P-M). However, the calculated values from ET0(P-T) and those from ET0(P-M) have lower correlation. Failing to consider aerodynamic influence in Priestley-Taylor equation should be the reason for the difference. If Priestley-Taylor equation is used to estimate short-interval reference crop evapotranspiration in the study area, the parameter in Priestley-Taylor equation should be modified for different season. In this paper, the comparative analysis between calculated daily results by Priestley-Taylor equation and Penman-Monteith equation has been done based on the observing data from Aug. 2003 to Aug. 2004 and the parameter in Priestley-Taylor equation for different season has been suggested.
%K mountainous area in North China
%K reference crop evapotranspiration
%K FAO Penman-monteith equation
%K short interval<br>华北山区
%K 短时段
%K 参考作物蒸散量
%K Penman-Monteith公式
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=869B153A4C6B5B85&jid=1328CFD3AA22A104E94CC0878E405FDC&aid=C3D16B66B6C688B6&yid=D0E58B75BFD8E51C&vid=EA389574707BDED3&iid=B31275AF3241DB2D&sid=4F2F18DD6F870C2C&eid=E203FB1A272C9DD2&journal_id=1007-6301&journal_name=地理科学进展&referenced_num=13&reference_num=17