土壤学报2011，Vol.48Issue(5)：947-956,10.
热脉冲技术估算土壤水流通量评价
ESTIMATION OF SOIL WATER FLUX WITH HEAT PULSE TECHNIQUE
摘要
Abstract
Soil water flux (/. ) is an important hydrological parameter which determines soil infiltration, runoff and solute transport, yet no corresponding practical techniques are available for its real-time measurement in situ. In this study, heat-pulse measurements were performed of deferent water fluxes in packed soil columns different in texture. Based on temperature changes between upstream and downstream locations from the heat-pulse probe, water flux was then calculated with the MDTD method (maximum dimensionless temperature increase difference) , and the Td/Ta method (ratio of temperature changes between downstream and upstream positions) , and a modified Td/Ta method along other known parameters. Results indicated that strong linear relationships (R2 >0. 99) existed between the estimated and the measured water fluxes ( up to 6 x 10" m s" ) . Though, the three methods all down-estimated, however, the Td/Tu method was highest precise and simplest in calculation, and needed the least number of additional parameters. In coarse sand, the Tt/Ta method was relatively more accurate in estimation of Jw, yet in fine sandy clay loam, especially when Jw was greater, obvious discrepancies were observed between the estimated and the measured, reaching 20% . Besides, the reason of underestimation of Jw with the heat-pulse technique is explored and presented as a basis for further development of the heat-pulse technique.关键词
水流通量/热脉冲技术/热传输Key words
Water flux/ Heat pulse technique/ Heat transfer分类
农业科技引用本文复制引用
鲁新蕊,龚元石..热脉冲技术估算土壤水流通量评价[J].土壤学报,2011,48(5):947-956,10.基金项目
国家自然科学基金项目(50479010)资助 （50479010）
