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Polymer tensiometers with ceramic cones: direct observations of matric pressures in drying soils
Polymer tensiometers ceramic cones drying soils
2010/12/22
Measuring soil water potentials is crucial to characterize vadose zone processes. Conventional tensiometers only measure until approximately −0.09 MPa, and indirect methods may suffer from the n...
Characterizing water fingering phenomena in soils using magnetic resonance imaging and multifractal theory
water fingering phenomena magnetic resonance imaging multifractal theory
2009/10/30
The study of water movement in soils is of fundamental importance in hydrologic science. It is generally accepted that in most soils, water and solutes flow through unsaturated zones via preferential ...
Redox Reactions in Soils Sequence of Redox Reactions in a Waterlogged Soil
Redox Reactions Soils Sequence Redox Reactions Waterlogged Soil
2009/10/28
An apparatus is described which under laboratory conditions permits sampling
of water and gases from a waterlogged soil throughout the experimental
period. A cultivated soil supplied with 6% straw i...
Penetration and Distribution of Tritiated Water in Soils of a Lysimeter
Penetration Distribution of Tritiated Water Lysimeter
2009/10/28
A lysimeter experiment was carried out to determine the penetration and
distribution of a water pulse applied on the soil surface as a tritium labelled
simulated precipitation (30-60 mm). Three plot...
Modelling of Unsaturated Flow in Heterogeneous Soils Part 11:Stochastic Simulation of Water Flow over a Field
Unsaturated Flow Heterogeneous Soils Stochastic Simulation
2009/10/27
Modelling of soil moisture conditions in spatially variable fields is treated using
stochastic methods. Spatial variability of moisture content in a vegetation covered
field is partly caused by fiel...
Modelling of Unsaturated Flow in Heterogeneous Soils Part I:Deterministic Simulations of Water Flow in Soil Profiles
Unsaturated Flow Heterogeneous Soils Deterministic Simulations
2009/10/27
Water flow and solute transport in the upper soil layers are processes which are
of importance in many hydrological and agricultural applications. These processes
are occurring in a medium which has...
Isotope studies in Swedish till basins indicate that stream stormflow is normally
dominated by pre-event water. The rapid response of the groundwater outflow
to infiltration may be explained by a la...
Methods Used for Calculation of Plant Available Water in Nordic Till Soils
Calculation Available Water Nordic Till Soils
2009/10/27
This paper describes different methods used in the Nordic countries for calculation
of the storage capacity of tills for water available for plant production. The
purpose of the paper is to give an ...
Unsaturated Hydraulic Conductivity Determined by the Hot Air Method for Some Danish Till Soils
Hydraulic Conductivity Hot Air Method Danish Till Soils
2009/10/27
Unsaturated hydraulic conductivity relations for topsoil and subsoil in 12 Danish
till soils were obtained from measurements by the hot air method. In the
range of pressure potentials (pF-values fro...
Spatial Variability of Physical Parameters and Processes in Two Field Soils Part II:Water Flow at Field Scale
Spatial Variability Physical Parameters Two Field Soils Field Scale
2009/10/26
The horizontal variability of soil hydraulic parameters, water content and suction
mcasurcd within two research ficlds in Denmark is analyzed and discussed.
A numerical analysis of the flow in the t...
Spatial Variability of Physical Parameters and Processes in Two Field Soils Part I:Water Flow and Solute Transport at Local Scale
Spatial Variability Physical Parameters Two Field Soils Local Scale
2009/10/26
Natural field systems exhibit a large degree of soil heterogeneity which affects
the movement of water and solutes and thus leads to highly varying observations
of water contcnt and solute concentra...
Spatial Variability of Physical Parameters and Processes in Two Field Soils Part Ill:Solute Transport at Field Scale
Spatial Variability Physical Parameters Two Field Soils Field Scale
2009/10/26
A numerical analysis of solute transport in two spatially heterogeneous fields is
carried out assuming that the fields are composed of ensembles of one-dimensional
non-interacting soil columns, each...
Modelling the Effects of Acid Sulphate Soils on River Acidity in Finland
Effects of Acid Sulphate Soils River Acidity
2009/10/26
Acid sulphate (AS) soils cover extensive areas of the coastal plains in western
Finland. These soils constitute an environmental hazard due to their ability to
relcase acidity when exposed to atmosp...
Frost Heave due to Ice Lens Formation in Freezing Soils 2.Field Application
Frost Heave Ice Lens Formation Freezing Soils Field Application
2009/10/26
An operational model for estimation of frost heave in field where stratified soil
profile appears is presented. The model is developed from the research model
described in part B. Soil layers are fi...
Frost Heave due to Ice Lens Formation in Freezing Soils 1.Theory and Verification
Frost Heave Ice Lens Formation Freezing Soils Theory and Verification
2009/10/26
A frost heave model which simulates formation of ice lenses is developed for
saturated salt-free soils. Quasi-steady state heat and mass flow is considered.
Special attention is paid to the transmit...