Thermodynamic and Transport Properties of Pure and Saline Water

Kukulka, David J.; Gebhart, B.; Mollendorf, Joseph C.

doi:10.1016/s0065-2717(08)70121-7

Cited by 48 publications

(32 citation statements)

References 21 publications

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“…In Samoylov, the minimum of modelled daily sums of methane emissions during summer is smaller and the maximum much higher for rim and centre compared to measurements published by Kutzbach et al (2004). However, these observations do not include spring bursts with very short but also very high emissions or even dry phases with small uptake.…”

Section: Discussionmentioning

confidence: 62%

“…It is obvious that there is a mismatch with the real situation in the field, where the centre is often water-saturated, with water tables at or above the soil surface. While measurements of the water table at the rim give values between 35 and 39 cm (Kutzbach et al, 2004), the mean summer value in the model is 30.88 cm. For the centre, measurements give values between −12 and 17 cm (Sachs et al, 2010), while the mean summer value in the model is 24.52 cm.…”

Section: Modelled Water Table and Permanent Saturated Depthmentioning

confidence: 89%

“…According to Kutzbach et al (2004), mosses and lichens grow about 5 cm high and cover about 95 %, while vascular plants grow about 20 to 30 cm high and cover about 30 % of the area. The most dominant vascular plant, both at the rim and at the centre, is Carex aquatilis, but with a dominance of only 8 % at the rim compared to 25 % at the centre.…”

Section: Site Descriptionmentioning

confidence: 99%

“…The diffusion coefficients of methane and oxygen in the exodermis are unknown but can be assumed to be slightly lower than in water (e.g. Kutzbach et al, 2004;Končalová, 1990). Therefore, their values are set to be 80 % of their respective values in soil water at the given soil temperatures and pressures, D r = 0.8 · D w .…”

Section: Plant Transportmentioning

confidence: 99%

“…With increasing amounts of roots being able to transport gases, the distance for methane to travel to them is getting smaller and transport is generally enhanced. To account for that, f r is set for rim and centre, respectively, as the fraction of the dominance measure for Carex aquatilis divided by the dominance of vascular plants (Kutzbach et al, 2004). The plant transport of methane is thus modelled as…”

Section: Plant Transportmentioning

confidence: 99%

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Process-based modelling of the methane balance in periglacial landscapes (JSBACH-methane)

et al. 2017

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Abstract. A detailed process-based methane module for a global land surface scheme has been developed which is general enough to be applied in permafrost regions as well as wetlands outside permafrost areas. Methane production, oxidation and transport by ebullition, diffusion and plants are represented. In this model, oxygen has been explicitly incorporated into diffusion, transport by plants and two oxidation processes, of which one uses soil oxygen, while the other uses oxygen that is available via roots. Permafrost and wetland soils show special behaviour, such as variable soil pore space due to freezing and thawing or water table depths due to changing soil water content. This has been integrated directly into the methane-related processes. A detailed application at the Samoylov polygonal tundra site, Lena River Delta, Russia, is used for evaluation purposes. The application at Samoylov also shows differences in the importance of the several transport processes and in the methane dynamics under varying soil moisture, ice and temperature conditions during different seasons and on different microsites. These microsites are the elevated moist polygonal rim and the depressed wet polygonal centre. The evaluation shows sufficiently good agreement with field observations despite the fact that the module has not been specifically calibrated to these data. This methane module is designed such that the advanced land surface scheme is able to model recent and future methane fluxes from periglacial landscapes across scales. In addition, the methane contribution to carbon cycleclimate feedback mechanisms can be quantified when running coupled to an atmospheric model.

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Section: Discussionmentioning

confidence: 62%

Section: Modelled Water Table and Permanent Saturated Depthmentioning

confidence: 89%

Section: Site Descriptionmentioning

confidence: 99%

Section: Plant Transportmentioning

confidence: 99%

Section: Plant Transportmentioning

confidence: 99%

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Process-based modelling of the methane balance in periglacial landscapes (JSBACH-methane)

et al. 2017

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The memory time effects for unsteady seas and oceans water flow through the limestone porous medium in the presence of chemical reaction and Soret effects

El-Latief

Abdel-Hameid²

2022

Z Angew Math Mech

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In this work, we study the effects of the thermal and diffusion memories in the seas and oceans water using the methodology of fractional calculus for modeling a viscous fluid. In our model, we derive a model with two fractional parameters representing the thermal and diffusion effects for this type of fluid. We formulate a problem of mixed convection heat and mass transfer flow of a viscous fluid through a Limestone porous medium in a vertical channel whose walls are kept at variable temperature and concentration. The influences of heat‐mass memories in the presence of chemical reaction, heat generation/absorption and, the Soret effect are discussed and represented graphically on all variables fields. Also, the influences of Darcy, Prandtl, Schmidt, Grashof parameters are compared with the effect of fractional parameters.

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