Spatial Variability of Preferential Flow and Infiltration Redistribution along a Rocky-Mountain Hillslope, Northern China
Open Access
- 12 April 2020
- Vol. 12 (4), 1102
- https://doi.org/10.3390/w12041102
Abstract
Rock fragments in soil strongly increase the complexity of hydrological processes. Spatial variability of preferential flow and infiltration characteristics, especially along a rocky-mountain hillslope are poorly understood. In this study, five rainfall–dye tracer experiments were performed in the rocky Taihang Mountains, northern China, to investigate the spatial variability of preferential flow and infiltration redistribution on different hillslope positions. Tracers were used to distinguish macropore flow and actual water flow patterns, and preferential flow indices and spatial non–uniformity of the infiltration redistribution were calculated using image analysis. Results showed increasing trends in the dye coverage, maximum infiltration depth, and steady infiltration rate with increased hillslope position, with a preferential flow fraction of 0.10, 0.11, 0.15, 0.29, and 0.26 for the bottom–, down–, mid–, upper–, and top–slope positions, respectively. With increased hillslope position, the spatial non–uniformity of the infiltration redistribution gradually increased in orthogonal and parallel directions to the stained section, and was supported by the fractal dimensions. Positive (gravel mass ratio, saturated water content, altitude, hydraulic conductivity and roots) and negative (bulk density and clay content) impacts on preferential flow and infiltration redistribution were quantitatively emphasized. The characteristic and mechanism of infiltration process were further identified along a rocky-mountain hillslope.This publication has 58 references indexed in Scilit:
- Effects of Rainfall Intensity and Slope Gradient on Runoff and Soil Moisture Content on Different Growing Stages of Spring MaizeWater, 2015
- Investigation of Rainfall-Runoff Processes and Soil Moisture Dynamics in Grassland Plots under Simulated Rainfall ConditionsWater, 2014
- Tracing and modeling preferential flow in a forest soil — Potential impact on nutrient leachingGeoderma, 2013
- Effect of antecedent conditions and fixed rock fragment coverage on soil erosion dynamics through multiple rainfall eventsJournal of Hydrology, 2013
- Preferential Flow Effects on Infiltration and Runoff in Grassland and Forest SoilsVadose Zone Journal, 2011
- Beech Forest Density Control on the Dominant Water Flow Types in Andic SoilsVadose Zone Journal, 2010
- Quantifying preferential flow in soils: A review of different techniquesJournal of Hydrology, 2009
- Water repellency, near-saturated infiltration and preferential solute transport in a macroporous clay soilGeoderma, 2008
- Runoff Production in a Forested, Shallow Soil, Canadian Shield BasinWater Resources Research, 1995
- Macropores and water flow in soilsWater Resources Research, 1982