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An assessment of hysteresis in studies on the hydraulic conductivity of peat soils

100%

Brzostowski E., Olszta W.

Zeszyty Problemowe Postępów Nauk Rolniczych

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1996

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tom 436

The value of hydraulic conductivity (K) has considerable theoretical and practical significance for the water economy of soils and plants. Measurements of hydraulic conductivity conducted for peat soils in the process of soil monolith drying and wetting indicated the occurrence of capillary hysteresis in the soils under study. Data presented in the paper may indicate that the phenomenon is directly affected by the physical-hydraulic properties of the soils. The hysteresis loop surface areas determined in the study may be insufficient to fully reflect the true situation as there is a lack of measurements of the soil water potential in the zone close to full saturation. Values of the surface area calculated according to statistical methods differ from values calculated according to Brooks and Corey’s formulae. A significant factor affecting the difference is the value of effective conductivity (Kₑ) which is one half of the conductivity at full saturation (Ks).

2

New approach to the calculation of pistachio powder hysteresis

75%

Tavakolipour H., Mokhtarian M.

International Agrophysics

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2016

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tom 30

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nr 2

3

Scaling the hydraulic functions of a water repellent sandy soil

75%

Stoffregen H., Wessolek G.

International Agrophysics

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2014

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tom 28

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nr 3

The heterogeneity of both unsaturated hydraulic conductivity and water retention was measured with a high spatial resolution on a transect using an evaporation method. Fifteen undisturbed 100 cm 3 soil cores were taken on a transect every 10 cm from the topsoil of a water repellent sandy site. Five dynamic water retention curves and four unsaturated conductivity curves were determined for each core. We conducted measurements without further saturation in the laboratory in order to achieve field-like conditions. The initial water contents were hetero- geneous, indicating different hysteretic conditions and water repellent areas. The scattering of the water retention curves was high, while the heterogeneity of unsaturated conductivity curves was unexpectedly low. Two scaling approaches were used to describe the heterogeneity: one with and one without considering hysteresis. The concept of scaling applies well to describing the heterogeneity of both hydraulic functions. Including hysteresis leads to similar results than excluding hysteresis. The distribution of the hydraulic conductivity and the water retention were inde- pendent from each other. The results give important information for numerical simulation of the water flow with heterogeneous hydraulic functions.

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Suspended sediment concentration and yield in snowmelt flood events in a small lowland river

75%

Hejduk A., Banasik K.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2010

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tom 42

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nr 1

61-68

Results of investigation on suspended sediment delivery from small lowland, agriculturally used catchment of Zagożdżonka River, located in central Poland, during snowmelt periods of 2001– –2007 are presented. The study catchment‘s area, upstream of the well equipped gauging station at Czarna, is 23.4 km2. Suspended sediment concentration and sediment yield has been calculated and analysed for 15 snowmelt flood events. The relationship between suspended sediment concentration and the discharge has been analyzed. It has been found that the relation, in majority of the cases, has the form of clockwise hysteresis, however the existance of other types of hysteresis i.e. anticlockwise and “8” shape, have been also confi rmed. Signifi cant relation between suspended sediment yield and runoff volume of snowmelt flood events has been also found.

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Effect of water content on the strain hysteresis of pea (Pisum s.)

75%

Lysiak G., Kulig R., Skonecki S., Laskowski J., Nadulski R.

Teka Komisji Motoryzacji i Energetyki Rolnictwa

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2013

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tom 13

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nr 1

6

Hysteresis between wetting and drying processes as affected by soil aggregate size

75%

Witkowska-Walczak B.

International Agrophysics

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2006

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tom 20

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nr 4

7

Model of soil water hysteresis based on pore space geometry

75%

Kaszubkiewicz J.

Polish Journal of Soil Science

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1997

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tom 30

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nr 1

8

Temperature dependent hysteresis-like changes of motility parameters in human spermatozoa

63%

Warchol W., Kotwicka M.

Folia Histochemica et Cytobiologica

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2002

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tom 40

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nr 2

9

Histereza odksztalcen miazszu wybranych warzyw

51%

Bohdziewicz J.

Acta Agrophysica

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2003

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tom 02

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nr 4[98]

707-716

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Matematyczne modelowanie zjawisk tiksotropowych w modelowym ukladzie wodnego roztworu skrobi ziemniaczanej

51%

Ptaszek A., Grzesik M.

Acta Agrophysica

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2003

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tom 02

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nr 3[97]

619-626

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Histereza sorpcyjna wybranych tworzyw drzewnych

38%

Gumowska A., Kowaluk G.

Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie

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2017

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tom 58

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nr 1-2

Ograniczanie wyników

An assessment of hysteresis in studies on the hydraulic conductivity of peat soils

New approach to the calculation of pistachio powder hysteresis

Scaling the hydraulic functions of a water repellent sandy soil

Suspended sediment concentration and yield in snowmelt flood events in a small lowland river

Effect of water content on the strain hysteresis of pea (Pisum s.)

Hysteresis between wetting and drying processes as affected by soil aggregate size

Model of soil water hysteresis based on pore space geometry

Temperature dependent hysteresis-like changes of motility parameters in human spermatozoa

Histereza odksztalcen miazszu wybranych warzyw

Matematyczne modelowanie zjawisk tiksotropowych w modelowym ukladzie wodnego roztworu skrobi ziemniaczanej

Histereza sorpcyjna wybranych tworzyw drzewnych