A model to couple overland flow and infiltration into macroporous vadose zone

Ruan, H.; Illangasekare, Tissa H.

doi:10.1016/s0022-1694(98)00179-6

Cited by 16 publications

(12 citation statements)

References 9 publications

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“…The parameter S was also significantly correlated with water stable aggregates (WSA, r 2 ϭ 0.38, P Ͻ 0.001) and soil organic carbon (SOC) content (r 2 ϭ 0.33; P Ͻ 0.001). The r 2 of 0.38 also indicated that WSA alone explained only 38% variability in S. Therefore, other factors, such as antecedent soil water content of soil, landscape position, or macro or biopores may have also influenced the S values (Ruan and Illangasekare, 1998;Shipitalo and Butt, 1999;Shaver et al, 2002;Shukla et al, 2003). The linear multiple regression analysis with S as dependent variable and WSA, b , i 5 and i c as independent variables explained 86% of the variability in S (P Ͻ 0.0001).…”

Section: Discussionmentioning

confidence: 99%

Experimental Evaluation of Infiltration Models for Different Land Use and Soil Management Systems

Shukla

Lal

Unkefer³

2003

Soil Science

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Section: Discussionmentioning

confidence: 99%

Experimental Evaluation of Infiltration Models for Different Land Use and Soil Management Systems

Shukla

Lal

Unkefer³

2003

Soil Science

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“…Sidle et al, 1995;van de Giesen et al, 2000;Joel et al, 2002;Stomph et al, 2002;Cerdan et al, 2004;Vigiak et al, 2006) and preferential flow pathways (Ruan and Illangasekare, 1998;Noguchi et al, 1999;Sidle et al, 2001;Uchida et al, 2001;Lin et al, 2006), it is clear that Hortonian overland flow comprises only a minor component of catchment stormflow at both the Mie and Nariki sites. Further evidence for this is the almost total absence of rill development on hillslopes at these sites.…”

Section: Developing a More Comprehensive Understanding Of Near-surfacmentioning

confidence: 99%

Hortonian overland flow from Japanese forest plantations—an aberration, the real thing, or something in between?

Sidle

Hirano

Gomi

et al. 2007

Hydrological Processes

111

102

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There is a growing opinion that poorly managed plantation forests in Japan are contributing to increased storm runoff and erosion. Here we present evidence to the contrary from runoff plots at two scales (hillslope and 0·5 × 2 m plots) for several forest conditions in the Mie and Nariki catchments. Runoff coefficients from small plots in untended hinoki forests were variable but typically higher than from better managed or deciduous forests during small storms at Nariki; at Mie, runoff during small events was highly variable from all small plots but runoff coefficients were similar for hinoki plots with and without understory vegetation, while the deciduous plot had lower runoff coefficients. Storm runoff was less at the hillslope scale than the plot scale in Mie; these results were more evident at sites with better ground cover. During the largest storms at both sites, differences in runoff due to forest condition were not evident regardless of scale. Dynamic soil moisture tension measurements at Nariki indicated that during a large storm, flow in the upper organic-rich and root-permeated soil horizons was 3·2 times higher than measured overland runoff from a small hinoki plot with poor ground cover and 8·3 times higher than runoff from a deciduous forest plot. On the basis of field observations during storms, at least a portion of the monitored 'Hortonian overland flow' was actually occurring in this near-surface 'biomat'. Therefore our field measurements in both small and large plots potentially included biomat flow in addition to short-lived Hortonian runoff. Because overland flow decreased with increasing scale, rill erosion did not occur on hillslopes. Additionally, runoff coefficients were not significantly different among cover conditions during large storms; thus, the 'degraded' forest conditions appear not to greatly enhance peak flows or erosion potential at larger scales, especially when biomat flow is significant.

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“…Léonard et al (1999) investigated surface initiation with laboratory experiments and used the results to verify a flow model. Ruan and Illangasekare (1998) studied surface initiation with a model that coupled overland flow and infiltration into macropores. Subsurface initiation was studied in the laboratory (Phillips et al, 1989;Ela et al, 1992;Li and Ghodrati, 1997) and could also be detected in the field (Weiler et al, 1998).…”

Section: Flow Processes In Soils Containing Macropores Built By Earthmentioning

confidence: 99%

An experimental tracer study of the role of macropores in infiltration in grassland soils

Weiler

Naef²

2003

Hydrological Processes

283

217

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Abstract:Water flow in macropores is an important mechanism of infiltration in natural soils and, as such, is crucial for the prediction of runoff generation. The major flow processes controlling macropore flow are the initiation of macropore flow (water supply into macropores) and the water transfer from the macropores into the surrounding soil matrix (interaction). The water movement during infiltration and the resulting flow paths were studied with combined sprinkling and dye tracer experiments under different rainfall intensities and initial soil moisture conditions. The dye tracer was continuously applied with the sprinkling water on 1 m 2 plots. After the sprinkling, horizontal and vertical soil sections were prepared for surveying dye patterns, which showed the cumulated flow pathways in the soils. These experiments were carried out on four hillslope sites covered with grassland, where earthworms mainly built the macropore system. The evaluation of the flow processes in the soil was based on classified dye patterns and measurements of water content and matric potential. The results illustrate how flow in earthworm channels influences general hydrological flow processes during extreme rainfall events. Macropore flow was initiated from the soil surface or from a saturated or partially saturated soil layer. Transfer of water from the macropores into the soil matrix was mainly influenced by the soil properties and soil water content. The permeability of the underlying bedrock in combination with this transfer of water controlled the drainage of the macropores. Finally, major effects of macropore flow processes on the hydrological response were extracted. Infiltration excess overland flow was reduced if water bypassed the less permeable layer through macropores, saturation excess overland flow was less affected by macropores, and subsurface flow was activated very rapidly because the infiltrated water bypassed the soil matrix. This study highlights the most important processes that have to be considered in order to understand better and to model infiltration in natural soils in the future.

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A model to couple overland flow and infiltration into macroporous vadose zone

Cited by 16 publications

References 9 publications

Experimental Evaluation of Infiltration Models for Different Land Use and Soil Management Systems

Experimental Evaluation of Infiltration Models for Different Land Use and Soil Management Systems

Hortonian overland flow from Japanese forest plantations—an aberration, the real thing, or something in between?

An experimental tracer study of the role of macropores in infiltration in grassland soils

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