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Influences of thermal dispersion on soil water flux estimates using heat pulse technique in saturated soils
X. R. Lu, Y. Sun, G. S. Chen, Y. Qin, Y. F. Bai, X. J. Li and X. J. Mou
2018
Source PublicationCatena
Volume167Pages:228-235
Other AbstractThe heat-pulse technique (HPT) shows good potentials for in situ determinations of soil water flux (J), but its applications are limited because of J underestimates. This study aims to experimentally investigate the influences of thermal dispersion on J estimates using HPT in packed sand, silt loam, and sandy clay loam with onedimensional saturated water flow, hypothesizing that J underestimates are caused by neglecting heat dispersion in heat transport model that arises from the heterogeneity of water velocities within and between water-filled soil pores. The results indicated that J estimates exhibited good linearity with the measurements (R-2 > 0.95). However, they were biased toward underestimates. The thermal dispersion's dependence on J was described by a power function. When heat dispersion was considered in the traditional heat conduction-advection model, the traditional ratio method yielded a higher accuracy with relative errors reduced by 45.0-74.3%, the bias reduced by 47.1-74.0% and the root mean square error reduced by 48.0-68.8%. In terms of the range of J herein, the maximum Keith Jirka Jan (KJJ) numbers obtained were 6.8%, 10.4%, and 13.4% for sand, silt loam, and sandy clay loam, respectively. Moreover, their corresponding J thresholds were 41.7, 21.1, and 12.3 mu m s(-1), respectively.
Document Type期刊论文
Identifierhttp://ir.iga.ac.cn/handle/131322/9197
Collection湿地生态系统管理学科组
Recommended Citation
GB/T 7714
X. R. Lu, Y. Sun, G. S. Chen, Y. Qin, Y. F. Bai, X. J. Li and X. J. Mou. Influences of thermal dispersion on soil water flux estimates using heat pulse technique in saturated soils[J]. Catena,2018,167:228-235.
APA X. R. Lu, Y. Sun, G. S. Chen, Y. Qin, Y. F. Bai, X. J. Li and X. J. Mou.(2018).Influences of thermal dispersion on soil water flux estimates using heat pulse technique in saturated soils.Catena,167,228-235.
MLA X. R. Lu, Y. Sun, G. S. Chen, Y. Qin, Y. F. Bai, X. J. Li and X. J. Mou."Influences of thermal dispersion on soil water flux estimates using heat pulse technique in saturated soils".Catena 167(2018):228-235.
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