Journal ArticleDOI
Water flow in soil macropores iii. a statistical approach
Peter F. Germann,Keith Beven +1 more
TLDR
In this paper, two regression equations describing water movement in saturated macropores in the field are compared with a theoretical expresion of the form Qmaα e2ma where Qma is the saturated volume flux density through a macropore system of porosity ema.Abstract:
Summary
Two regression equations describing water movement in saturated macropores in the field are compared with a theoretical expresion of the form Qmaα e2ma where Qma is the saturated volume flux density through a macropore system of porosity ema. The theoretical exponent of 2 agrees fairly well with the analyses of two very different sets of field experiments by Burger (1922–1940) and Ehlers (1975). It is suggested that the relationship Qma= Q*e2ma may be a useful first approximation to predict macropore flow, where Q* is an empirical coefficient that is expected to depend on the hydraulic connectivity, geometrical structure, tortuosity, roughness and other properties of the macropore system.read more
Citations
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Journal ArticleDOI
Macropores and water flow in soils
Keith Beven,Peter F. Germann +1 more
TL;DR: In this article, the importance of large continuous openings (macropores) on water flow in soils is discussed and the limitations of models that treat macropores and matrix porosity as separate flow domains are stressed.
Journal ArticleDOI
Macropores and water flow in soils revisited
Keith Beven,Peter F. Germann +1 more
TL;DR: It is suggested that the topic has still not received the attention that its importance deserves, in part because of the ready availability of software packages rooted firmly in the Richards domain, albeit that there is convincing evidence that this may be predicated on the wrong experimental method for natural conditions.
Book
Hillslope stability and land use
TL;DR: In this article, the authors present a survey of research findings on soil mass movement into a format usable by practitioners and students, and illustrate various prediction, avoidance, and control measures used in managing unstable terrain.
Journal ArticleDOI
Quantifying preferential flow in soils: A review of different techniques
TL;DR: In this paper, the authors present a review of laboratory and field techniques, such as breakthrough curves, dye tracing, and scanning techniques, for evaluating preferential flow (PF) in soil at different scales.
Journal ArticleDOI
A review of model applications for structured soils: a) Water flow and tracer transport.
TL;DR: This review compiles results published over the past decade on the application of physically based models for simulating PF and PNE non-reactive tracer transport for scales ranging from the soil column to the catchment area.
References
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Journal ArticleDOI
Observations on Earthworm Channels and Infiltration on Tilled and Untilled Loess Soil
TL;DR: The number of earthworm channels ranging from 2 to 11 mm in diameter were counted to 80 cm depth in tilled and untilled grey-brown podzolic soil derived from loess as discussed by the authors.
Journal ArticleDOI
Water flow in soil macropores i. an experimental approach
Peter F. Germann,Keith Beven +1 more
TL;DR: In this paper, a method is proposed by which the volume of the macropore system and its effect on the infiltration capacity can be estimated using a soil water potential concept, and two large and undisturbed soil samples were investigated, and the volumes of macropores were 0.01 and 0.045 of the sample volumes, respectively.