非饱和土多模态水力特性一般模型的评价

IF 2.3 4区 环境科学与生态学 Q3 WATER RESOURCES Journal Of Hydrology And Hydromechanics Pub Date : 2022-12-06 DOI:10.2478/johh-2022-0039
K. Seki, N. Toride, M. V. van Genuchten
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引用次数: 2

摘要

许多土壤和其他多孔介质具有双重或多重孔隙型特征。在之前的一项研究中(Seki et al., 2022),我们提出了这种介质的多模态保水和闭式水力传导方程。本研究的目的是证明所提出的方程在实际中是有用的。具体而言,双bc (Brooks and Corey)-CH (common head) (DBC),双vg (van Genuchten)-CH (DVC)和KO (Kosugi)1BC2-CH (KBC)模型在广泛的土壤类型中进行了评估。这三种模型与实测的保水性和导电性数据在很宽的压头范围内表现出良好的一致性。首先对保水参数进行优化,然后对饱和导水率(Ks)和一般导水率方程中的两个参数(p, q)或(p, r)进行优化,得到结果。虽然传统的弯曲系数p是优化的,(q, r)是固定的,但灵敏度分析表明,对于多模态模型,需要优化两个参数(p + r, qr)。在UNSODA数据库的20个土壤中,以r = 1和(Ks, p, q)优化的KBC模型的log(水力导率)的平均R2最高(0.985),与q = 1和(Ks, p, r)优化的DVC模型的结果基本相当(0.973);在优化(Ks, p, a, ω)时,广泛使用的Peters模型均高于R2(0.956)。所提出的方程在数学上简单一致,对实际应用很有帮助。
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Evaluation of a general model for multimodal unsaturated soil hydraulic properties
Abstract Many soils and other porous media exhibit dual- or multi-porosity type features. In a previous study (Seki et al., 2022) we presented multimodal water retention and closed-form hydraulic conductivity equations for such media. The objective of this study is to show that the proposed equations are practically useful. Specifically, dual-BC (Brooks and Corey)-CH (common head) (DBC), dual-VG (van Genuchten)-CH (DVC), and KO (Kosugi)1BC2-CH (KBC) models were evaluated for a broad range of soil types. The three models showed good agreement with measured water retention and hydraulic conductivity data over a wide range of pressure heads. Results were obtained by first optimizing water retention parameters and then optimizing the saturated hydraulic conductivity (Ks) and two parameters (p, q) or (p, r) in the general hydraulic conductivity equation. Although conventionally the tortuosity factor p is optimized and (q, r) fixed, sensitivity analyses showed that optimization of two parameters (p + r, qr) is required for the multimodal models. For 20 soils from the UNSODA database, the average R2 for log (hydraulic conductivity) was highest (0.985) for the KBC model with r = 1 and optimization of (Ks, p, q). This result was almost equivalent (0.973) to the DVC model with q = 1 and optimization of (Ks, p, r); both were higher than R2 for the widely used Peters model (0.956) when optimizing (Ks, p, a, ω). The proposed equations are useful for practical applications while mathematically being simple and consistent.
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来源期刊
CiteScore
4.20
自引率
5.30%
发文量
30
审稿时长
>12 weeks
期刊介绍: JOURNAL OF HYDROLOGY AND HYDROMECHANICS is an international open access journal for the basic disciplines of water sciences. The scope of hydrology is limited to biohydrology, catchment hydrology and vadose zone hydrology, primarily of temperate zone. The hydromechanics covers theoretical, experimental and computational hydraulics and fluid mechanics in various fields, two- and multiphase flows, including non-Newtonian flow, and new frontiers in hydraulics. The journal is published quarterly in English. The types of contribution include: research and review articles, short communications and technical notes. The articles have been thoroughly peer reviewed by international specialists and promoted to researchers working in the same field.
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