DOI: 10.5194/hess-24-3271-2020
论文题名: Field observations of soil hydrological flow path evolution over 10 millennia
作者: Hartmann A. ; Semenova E. ; Weiler M. ; Blume T.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期: 6 起始页码: 3271
结束页码: 3288
语种: 英语
Scopus关键词: Groundwater flow
; Hydraulics
; Irrigation
; Soils
; Vegetation
; Brilliant blue FCF
; Digital image analysis
; Irrigation amounts
; Irrigation intensities
; Laboratory measurements
; Preferential flows
; Soil forming process
; Vegetation patches
; Infiltration
; chronosequence
; field method
; hillslope
; infiltration
; landscape evolution
; moraine
; observational method
; path analysis
; preferential flow
; soil water
; water flow
英文摘要: Preferential flow strongly controls water flow and transport in soils. It is ubiquitous but difficult to characterize and predict. This study addresses the occurrence and the evolution of preferential flow during the evolution of landscapes and here specifically during the evolution of hillslopes. We targeted a chronosequence of glacial moraines in the Swiss Alps to investigate how water flow paths evolve along with the soil-forming processes. Dye tracer irrigation experiments with a Brilliant Blue FCF solution (4 g L-1) were conducted on four moraines of different ages (30, 160, 3000, and 10 000 years). At each moraine, three dye tracer experiments were conducted on plots of 1.5 m ×1.0 m. The three plots at each moraine were characterized by different vegetation complexities (low, medium, and high). Each plot was further divided into three equal subplots for the application of three different irrigation amounts (20, 40, and 60 mm) with an average irrigation intensity of 20 mm h-1. The day after the experiment five vertical soil sections were excavated, and the stained flow paths were photographed. Digital image analysis was used to derive average infiltration depths and flow path characteristics such as the volume and surface density of the dye patterns. Based on the volume density, the observed dye patterns were assigned to specific flow type categories. The results show a significant change in the type of preferential flow paths along the chronosequence. The flow types change from a rather homogeneous matrix flow in coarse material with high conductivities and a sparse vegetation cover at the youngest moraine to a heterogeneous infiltration pattern at the medium-age moraines. Heterogeneous matrix and finger flow are dominant at these intermediate age classes. At the oldest moraine only macropore flow via root channels was observed in deeper parts of the soil, in combination with a very high water storage capacity of the organic top layer and low hydraulic conductivity of the deeper soil. In general, we found an increase in water storage with increasing age of the moraines, based on our observations of the reduction in infiltration depth as well as laboratory measurements of porosity. Preferential flow is, however, not only caused by macropores, but especially for the medium-age moraine, it seems to be mainly initiated by soil surface characteristics (vegetation patches and microtopography). © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162656
Appears in Collections: 气候变化与战略
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作者单位: Hartmann, A., Section Hydrology, GFZ German Research Centre for Geosciences, Potsdam, Germany; Semenova, E., Chair of Hydrology, University of Freiburg, Freiburg, Germany; Weiler, M., Chair of Hydrology, University of Freiburg, Freiburg, Germany; Blume, T., Section Hydrology, GFZ German Research Centre for Geosciences, Potsdam, Germany
Recommended Citation:
Hartmann A.,Semenova E.,Weiler M.,et al. Field observations of soil hydrological flow path evolution over 10 millennia[J]. Hydrology and Earth System Sciences,2020-01-01,24(6)