DOI: 10.5194/hess-18-875-2014
Scopus记录号: 2-s2.0-84896788719
论文题名: True colors-experimental identification of hydrological processes at a hillslope prone to slide
作者: Schneider P ; , Pool S ; , Strouhal L ; , Seibert J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 2 起始页码: 875
结束页码: 892
语种: 英语
Scopus关键词: Annual precipitation
; Dominant runoff process
; Formation process
; Hydrological process
; Rainfall intensity
; Shallow landslide
; Sodium chloride (NaCl)
; Subsurface stormflow
; Aquifers
; Experiments
; Flow velocity
; Runoff
; Sodium chloride
; Soils
; Storms
; Infiltration
; flow velocity
; hillslope
; hydrological modeling
; landslide
; marl
; molasse
; runoff
; sliding
; slope dynamics
; soil dynamics
英文摘要: This study investigated runoff formation processes of a pre-alpine hillslope prone to slide. The experimental pasture plot (40 m × 60 m) is located in the northern front range of the Swiss Alps on a 30 steep hillslope (1180 m a.s.l., 1500 + mm annual precipitation). A gleysol (H-Go-Gr) overlies weathered marlstone and conglomerate of subalpine molasse. We conducted sprinkling experiments on a subplot (10 m × 10 m) with variable rainfall intensities. During both experiments fluorescein line-tracer injections into the topsoil, and sodium chloride (NaCl) injections into the sprinkling water were used to monitor flow velocities in the soil. The observed flow velocities for fluorescein in the soil were 1.2 and 1.4 × 10-3 m s-1. The NaCl breakthrough occurred almost simultaneously in all monitored discharge levels (0.05, 0.25 and 1.0 m depth), indicating a high-infiltration capacity and efficient drainage of the soil. These initial observations suggested "transmissivity feedback", a form of subsurface stormflow, as the dominant runoff process. However, the results of a brilliant blue dye tracer experiment completely changed our perceptions of the hillslope's hydrological processes. Excavation of the dye-stained soils highlighted the dominance of "organic layer interflow", a form of subsurface stormflow. The dye stained the entire H horizon, vertical soil fractures, and macropores (mostly worm burrows) up to 0.5 m depth. Lateral drainage in the subsoil or at the soil-bedrock interface was not observed, and thus was limited to the organic topsoil. In the context of shallow landslides, the subsoil (Go/Gr) acted as an infiltration and exfiltration barrier, which produced significant lateral drainage in the topsoil (H) and possibly a confined aquifer in the bedrock. © 2014 Author (s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78308
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geography, University of Zurich, Zurich, Switzerland; Faculty of Civil Engineering, Czech Technical University, Prague, Czech Republic; Department of Earth Sciences, Uppsala University, Uppsala, Sweden
Recommended Citation:
Schneider P,, Pool S,, Strouhal L,et al. True colors-experimental identification of hydrological processes at a hillslope prone to slide[J]. Hydrology and Earth System Sciences,2014-01-01,18(2)