Surface renewal estimates of evapotranspiration. Short canopies

被引：6

作者：

Duce, P ^{[1
]}

Spano, D ^{[1
]}

Snyder, RL ^{[1
]}

Paw, KT ^{[1
]}

机构：

[1] CNR, Ist Monitoraggio Agroecosistemi, I-07100 Sassari, Italy

来源：

SECOND INTERNATIONAL SYMPOSIUM ON IRRIGATION OF HORTICULTURAL CROPS, VOLS 1 AND 2 | 1997年 / 449期

关键词：

sensible heat flux; energy balance; eddy covariance; coherent structures; structure functions;

D O I：

10.17660/ActaHortic.1997.449.6

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Surface renewal (SR) analysis was utilized to calculate sensible heat flux density (H) over pasture grass, wheat, and sorghum canopies. The SR analysis uses high frequency temperature measurements above canopies to calculate H values using a conservation of energy equation. Then the H values were employed to estimate evapotranspiration (lE) using net radiation and soil heat flux density in the energy balance equation. The results were compared with lE values calculated using an independent measurement of H obtained with a sonic anemometer. Good estimates were found without the need for a weighting factor to account for unequal heating of the air volume below each measurement height. When a weighting factor was included in the calculation of H, the SEE values were improved. In combination with measurements of net radiation and soil heat flux density, the surface renewal method showed promise as a low-cost method to estimate evapotranspiration.

引用

页码：57 / 62

页数：6