• 地表通量监测 •

### 华北山区短时段参考作物蒸散量的计算

1. 1. 中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101;
2. 中国科学院研究生院,北京100039
• 收稿日期:2004-05-01 修回日期:2004-08-01 出版日期:2004-11-25 发布日期:2004-11-25
• 作者简介:杨聪(1979- ),男,中国科学院地理科学与资源研究所博士研究生,主要研究方向为水文过程.E-mail:yangc@igsnrr.ac.cn
• 基金资助:

国家自然科学基金资助项目(40371025); 中国科学院地理科学与资源研究所创新主干计划(CX10G-E01-08-02KZCX2-SW-317).

### Reference Crop Evapotranspiration Calculation in Short Interval of Mountainous Area in North China

YANG Cong1,2, YU Jingjie1, SONG Xianfang1, XIA Jun1, LIU Changming1

1. 1. Institute of Geographic Science and Natural Resources;CAS;Beijing 100101;
• Received:2004-05-01 Revised:2004-08-01 Online:2004-11-25 Published:2004-11-25

Abstract:

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.