根系对淤泥覆盖层水文地质特性的影响

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL

Canadian Geotechnical Journal Pub Date : 2023-11-15 DOI:10.1139/cgj-2023-0016

Alex Proteau, M. Guittonny, Bruno Bussière

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引用次数: 0

摘要

矿山尾矿贮存会造成严重的环境风险，如形成酸性矿井排水（AMD）。工程覆盖层通过控制进水提供了一种解决方案。它们的性能基于特定的土壤水文地质特性（SHPs）。它们必须支持植被，而植被会影响饱和导水率 (ksat) 和保水曲线 (WRC)。本研究使用柔性壁渗透仪和保水试验，评估了柳树根系在淤泥覆盖层上定植四年的影响。获得的 SHP 与根系特征进行了比较。结果表明，所研究的原位样本的水文地质特性并未受到根系的显著影响。测量值和预测 ksat 值的变化跨越了一个数量级，与根的定殖强度无关，根长密度（RLD）最高可达 2.98 cm/cm3。根长密度与测得的 ksat 值呈明显的正线性关系 (R2 = 0.54)。然而，当根系定植率较低时（RLD < 1 cm/cm3），RLD 与 van Genuchten WRC 模型的 nvg 参数呈负相关（R2 = 0.44），而 RLD > 1 cm/cm3 的样本则呈相反关系（R2 = 0.61）。此外，RLD 和粗根（直径大于 1 毫米）体积与细根体积之比（C/F 比）也会影响 WRC。随着时间的推移，较粗的根可能会对 SHPs 产生更明显的影响；需要进一步研究

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Impact of Roots on the Hydrogeological Properties of Silty Soil Covers

Mine tailings storage poses significant environmental risks such as the formation of acid mine drainage (AMD). Engineered covers offer a solution by controlling water ingress. Their performance is based on specific soil hydrogeological properties (SHPs). They must support vegetation which can impact saturated hydraulic conductivity (ksat) and water retention curve (WRC). This study assesses the impact of four-year-old willow root colonization on silty soil covers using flexible wall permeameters and water retention tests. The obtained SHPs were compared with root traits. Results suggested that the hydrogeological properties of the studied in situ samples were not significantly affected by roots. The variation of measured and predicted ksat values spanned an order of magnitude, regardless of the root colonization intensity, up to a root length density (RLD) of 2.98 cm/cm3. RLD showed a significant and positive linear relationship with measured ksat values (R2 = 0.54). However, when root colonization was low (RLD < 1 cm/cm3), RLD was negatively correlated to the nvg (R2 = 0.44) parameter of the van Genuchten WRC model, while the opposite relationship was observed for samples with RLD > 1 cm/cm3 (R2 = 0.61). Additionally, RLD and the coarse root (diameter > 1 mm) volume to fine root volume (C/F ratio) influenced WRCs. Over time, coarser roots may have a more pronounced impact on SHPs; further research is needed

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来源期刊

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.