开发一个扩展的Schnute模型,用于更真实地表示土壤保水和含水量曲线

IF 1.5 4区 农林科学 Q4 SOIL SCIENCE Canadian Journal of Soil Science Pub Date : 2023-05-03 DOI:10.1139/cjss-2023-0014
W. D. Reynolds, C. Drury, P. Handyside
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引用次数: 0

摘要

常用的土壤持水率θ(h)和持水量C(h)函数隐含地假设:i)θ(h)数据曲线是带拐点的S形;以及ii)C(h)数据曲线在土壤饱和时具有零值。然而,对完整土壤的解吸测量表明,θ(h)数据曲线的形状通常是凸单调的,没有拐点,饱和时的C(h)通常是有限的负值,而不是零。由于这些模型数据的不匹配可能会在模拟或预测接近饱和的土壤水力特性和水流时造成很大的误差,因此提出了一种新的“扩展Schnute”θ(h)-C(h)函数,该函数可以提供与θ(h)和C(h)测量值一致的θ(h。新函数和/或其嵌套的Schnute子模型为从粗砂、壤土、壤土、粘壤土、砂质粘壤土、粘土和有机粘土的完整岩芯中收集的解吸数据提供了高质量和物理现实的拟合;θ(h)-C(h)函数。新函数还提供了来自含有大孔隙和强级配孔径分布的结构性土壤的θ(h)和C(h)数据的精确和物理现实的表示。得出的结论是,扩展的Schnute模型能够为大范围的θ(h)和C(h)数据提供准确和物理现实的表示,并且进一步建议,当测量结果表明θ(h)在形状上是凸单调的和/或在土壤饱和时C(h)不为零时,该模型应优于其他模型。
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Development of an Extended Schnute Model for more Physically Realistic Representations of Soil Water Retention and Moisture Capacity Curves
Commonly used soil water retention, θ(h), and moisture capacity, C(h), functions implicitly assume that: i) the θ(h) data curve is sigmoid-shaped with an inflection; and ii) the C(h) data curve has a value of zero at soil saturation. Desorption measurements on intact soils indicate, however, that the θ(h) data curve is frequently convex-monotonic in shape with no inflection, and C(h) at saturation is often a finite negative value rather than zero. As these model-data mismatches may cause substantial error in simulation or prediction of near-saturated soil hydraulic properties and water flow, a new “Extended Schnute” θ(h)-C(h) function was proposed that can provide θ(h) curve shapes and saturated C(h) values which are consistent with θ(h) and C(h) measurements. The new function and/or its nested Schnute sub-model provided high-quality and physically realistic fits to desorption data collected from intact cores of coarse sand, loamy sand, loam, clay loam, sandy clay loam, clay and organic clay soils; and it out-performed or equalled the three-parameter van Genuchten θ(h)-C(h) function for every data-set. The new function also provided accurate and physically realistic representations of θ(h) and C(h) data from structured soils containing macropores and strongly graded pore size distributions. It was concluded that the Extended Schnute model is capable of providing accurate and physically realistic representations for a wide range of θ(h) and C(h) data, and it was further recommended that this model be considered over other models when measurements indicate that θ(h) is convex-monotonic in shape and/or C(h) is not zero at soil saturation.
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来源期刊
Canadian Journal of Soil Science
Canadian Journal of Soil Science 农林科学-土壤科学
CiteScore
2.90
自引率
11.80%
发文量
73
审稿时长
6.0 months
期刊介绍: The Canadian Journal of Soil Science is an international peer-reviewed journal published in cooperation with the Canadian Society of Soil Science. The journal publishes original research on the use, management, structure and development of soils and draws from the disciplines of soil science, agrometeorology, ecology, agricultural engineering, environmental science, hydrology, forestry, geology, geography and climatology. Research is published in a number of topic sections including: agrometeorology; ecology, biological processes and plant interactions; composition and chemical processes; physical processes and interfaces; genesis, landscape processes and relationships; contamination and environmental stewardship; and management for agricultural, forestry and urban uses.
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