Modeling compaction effects on hydraulic properties of soils using limited information

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE Soil & Tillage Research Pub Date : 2024-11-06 DOI:10.1016/j.still.2024.106349
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Abstract

Soil compaction leads to an increase in bulk density (ρb) and a shift in the pore-size distribution towards smaller pores. This in turn changes the soil hydraulic properties (SHP), i.e., the water retention curve (WRC) and the hydraulic conductivity curve (HCC). Up to now, attempts to model the effect of altered ρb on SHP has been limited to SHP models that account only for capillary water, neglecting water stored and transmitted in adsorbed films (non-capillary water). We combine a recently developed model for compaction effects on SHP with a SHP model system, which accounts for both capillary and non-capillary water (Peters-Durner-Iden model system - PDI). Due to a plausible course of the PDI-WRC towards oven dryness and a physically based prediction scheme of the PDI-HCC based on the WRC, the new combined approach can fully predict both soil hydraulic functions of compacted soils, even with limited information. The new approach is analyzed via a sensitivity analysis and tested with a large dataset from a silty arable soil. A comparison with an established prediction approach showed that our new approach has slightly better predictive performance within the measurement range and a more plausible course in the dry range. For our field data, the new approach performed best when only 2 of the water retention parameters were scaled based on the known ρb. One of them determines the adsorptive water content and the other the shift of the capillary retention function on suction axis. Both parameters can be considered model independent, indicating that the new approach may not need calibration for each capillary retention model within the PDI model system.
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利用有限信息模拟压实对土壤水力特性的影响
土壤压实会导致容重(ρb)增加,孔隙大小分布向更小的孔隙移动。这反过来又会改变土壤的水力特性(SHP),即保水曲线(WRC)和导水曲线(HCC)。迄今为止,对改变的 ρb 对 SHP 的影响进行建模的尝试仅限于只考虑毛细管水的 SHP 模型,而忽略了吸附膜中储存和传输的水(非毛细管水)。我们将最近开发的 SHP 压实效应模型与同时考虑毛细管水和非毛细管水的 SHP 模型系统(Peters-Durner-Iden 模型系统 - PDI)相结合。由于 PDI-WRC 走向烘箱干燥的过程是可信的,并且 PDI-HCC 是基于 WRC 的物理预测方案,因此即使信息有限,新的组合方法也能完全预测压实土壤的两种土壤水力功能。通过敏感性分析对新方法进行了分析,并使用淤泥质耕地土壤的大型数据集进行了测试。与已有的预测方法进行比较后发现,我们的新方法在测量范围内的预测性能略好,而在干燥范围内的预测结果更可信。对于我们的实地数据,当只有两个保水参数根据已知的 ρb 进行缩放时,新方法的性能最佳。其中一个是吸附水含量,另一个是吸力轴上毛细滞留函数的移动。这两个参数可视为与模型无关,这表明新方法可能不需要对 PDI 模型系统中的每个毛细管滞留模型进行校准。
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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