Investigating peat hydrological properties using field and laboratory methods: application to the Lanoraie peatland complex (southern Quebec, Canada)
Investigating peat hydrological properties using field and laboratory methods: application to the Lanoraie peatland complex (southern Quebec, Canada)
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使用现场和实验室方法研究泥炭水文特性：应用于 Lanoraie 泥炭地综合体（加拿大魁北克省南部）
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发表时间：
2008
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通讯作者：
M. Larocque
中科院分区：
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作者：
E. Rosa;M. Larocque
泥炭地内的流动动力学受水力参数如水力传导性、分散性和比产率以及各向异性和非均质性的控制。本研究的目的是通过不同的现场和实验室的方法来调查水力参数的变异性泥炭。位于Lanoraie泥炭地复合体（加拿大魁北克南部）的一个实验地点被用来测试不同的方法。在测压立管中进行了段塞和保释试验，以调查catotelm水力传导率。采用改进的立方体法（MCM）对立方体试样进行了达西试验和示踪剂试验相结合的方法，以评价粘土的渗透率、各向异性和分散性。提出了一种新的实验室方法来评估acrotelm水力传导和重力排水使用一个实验室实验池。大多数段塞试验的恢复曲线具有可压缩介质的特征，且随初始水头差的变化而变化。对立方样品的达西实验提供了可重复的结果，并且对于大多数样品观察到各向异性（Kh > Kv）。所有示踪剂实验显示不对称的突破曲线，表明存在延迟和/或双重孔隙度。水力传导率估计使用的实验坦克显示K的变化超过44的因素内的上40厘米的acrotelm。结果表明，与水力参数的空间变异性相比，与不同的现场和实验室方法相关的内在变异性较小。建议通过结合使用互补的现场和实验室调查，可以得到泥炭水文特性的综合评估。版权所有© 2007约翰威利父子有限公司。
Flow dynamics within a peatland are governed by hydraulic parameters such as hydraulic conductivity, dispersivity and specific yield, as well as by anisotropy and heterogeneity. The aim of this study is to investigate hydraulic parameters variability in peat through the use of different field and laboratory methods. An experimental site located in the Lanoraie peatland complex (southern Quebec, Canada) was used to test the different approaches. Slug and bail tests were performed in piezometer standpipes to investigate catotelm hydraulic conductivity. Combined Darcy tests and tracer experiments were conducted on cubic samples using the modified cube method (MCM) to assess catotelm hydraulic conductivity, anisotropy and dispersivity. A new laboratory method is proposed for assessing acrotelm hydraulic conductivity and gravity drainage using a laboratory experimental tank. Most of slug tests' recovery curves were characteristic of compressible media, and important variability was observed depending on the initial head difference. The Darcy experiments on cubic samples provided reproducible results, and anisotropy (Kh > Kv) was observed for most of samples. All tracer experiments displayed asymmetrical breakthrough curves, suggesting the presence of retardation and/or dual porosity. Hydraulic conductivity estimates performed using the experimental tank showed K variations over a factor of 44 within the upper 40 cm of the acrotelm. The results demonstrate that the intrinsic variability associated with the different field and laboratory methods is small compared with the spatial variability of hydraulic parameters. It is suggested that a comprehensive assessment of peat hydrological properties can be obtained through the combined use of complementary field and laboratory investigations. Copyright © 2007 John Wiley & Sons, Ltd.