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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Soil surface characteristics influence on infiltration in black marls: application to the super-Sauze earthflow (southern alps, france)
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Soil surface characteristics influence on infiltration in black marls: application to the super-Sauze earthflow (southern alps, france)

机译：土壤表面特征对黑泥土入渗的影响：在超级Sauze土流中的应用（南阿尔卑斯山，法国）

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摘要

Soil surface characteristics (SSCs) have a strong influence on the infiltration properties at the soil surface. They can explain spatial variations in the infiltration processes observed under natural rainfall for relatively little-differentiated material and can help us to understand the surface and subsurface hydrology of landslides, representative of some of black marls landscapes of the French southern Alps. This paper presents the results of investigations into the influence of SSCs using careful morphological description, in situ tension-disc infiltrometry and statistical analysis (hierarchical ascending classification and stepwise discriminant analysis). The site studied is the Super-Sauze earthflow. The selected infiltration and runoff variables were described for 233 microplots chosen all over the earthflow. The results show that an approach based on a description of relevant variables influencing water infiltration can validate a typology based on 'expert's knowledge. Hydraulic conductivity at saturation was measured on 36 undisturbed soil cores and at low negative pressure heads on 83 microplots: the dispersion exceeds three orders of magnitude at each pressure head. A statistical analysis of the data set obtained by describing selected variables showed the relevance of the black marl descriptors when defining types of SSC that enable us to distinguish significant hydrodynamical behaviour. This leads us to suggest a distribution of hydraulic conductivity curves near saturation for each SSC type, which can be used as a key to distribute local hydraulic conductivity values adapted to black marl hillslopes. As well as the types of SSC at a microplot scale leading to types of hydrodynamic properties, the typology of combinations of SSCs at a coarser scale should lead to types of hydrological response and to identification of hydrological and geomorphological response units.
机译：土壤表面特征（SSCs）对土壤表面的渗透特性有很大的影响。他们可以解释在自然降雨条件下观察到的相对分化程度较小的物质在入渗过程中的空间变化，并且可以帮助我们了解滑坡的表面和地下水文学，这些滑坡代表了法国南部阿尔卑斯山的一些黑泥土景观。本文介绍了通过仔细的形态学描述，原位张力盘渗透法和统计分析（分层升序分类和逐步判别分析）对SSC的影响进行调查的结果。研究的地点是Super-Sauze地流。描述了在整个土流中选择的233个微孔的入渗和径流变量。结果表明，基于描述影响水渗透的相关变量的方法可以验证基于“专家”知识的类型学。在36个原状土心和83个微孔的低负压头上测量了饱和时的导水率：每个压力头的分散度超过三个数量级。通过描述所选变量获得的数据集的统计分析表明，在定义SSC类型时，黑色泥灰描述符具有相关性，从而使我们能够区分出明显的水动力行为。这使我们建议每种SSC类型的水力传导率曲线分布接近饱和，可以用作分布适合于黑色泥石质山坡的局部水力传导率值的关键。除了在微图尺度上的SSC类型会导致流体动力学特性的类型外，在更粗糙的尺度上SSC组合的类型也应该导致水文响应的类型以及水文和地貌响应单位的识别。

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