Download Coupled Dynamics in Soil: Experimental and Numerical Studies by Yijian Zeng PDF

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By Yijian Zeng

In arid and semi-arid components, the most contributions to land floor techniques are precipitation, floor evaporation and floor strength balancing. within the close-to-surface layer and root-zone layer, vapor flux is the dominant flux controlling those procedures - strategy which, in flip, effect the neighborhood weather development and the neighborhood environment. The paintings suggested during this thesis makes an attempt to appreciate how the soil airflow impacts the vapor delivery in the course of evaporation procedures, through the use of a two-phase warmth and mass move version. the need of together with the airflow mechanism in land floor method experiences is mentioned and highlighted.

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Additional resources for Coupled Dynamics in Soil: Experimental and Numerical Studies of Energy, Momentum and Mass Transfer

Sample text

7a. The denseness of contours change with elapsed time, and become sparser with depth. From temperature gradient profiles, it was seen that there was an active layer for heat exchange, which was about 10 cm deep below the ground surface. 9 °C cm-1. 6 °C cm-1, and there was almost no temperature gradient below 10 cm depth. In additional, there were five contours for the temperature gradient of 0 °C cm-1, which indicated no heat conduction in the space-time field. Accordingly, these five contours were defined as zero heat flux planes.

With this general definition, in this study, the effective infiltration is defined as the amount of soil water remained in sand beneath the drying front (making the interface between the upward and downward soil water fluxes) by infiltrated water of a rainfall event, and thus not evaporated, and is evaluated based on the vadose zone soil water balance method. As mentioned above, the estimates of infiltration rate in deserts have mostly been conducted with the tracer method, which is mainly used to evaluate variations of flow and transport in thick desert vadose zones in response to paleoclimatic forcing, and thus with the time scale of thousand-year [29].

1 shows measured soil temperatures and water contents. 2 °C. 8 °C during the observation. Although the changes in soil temperature decrease with increasing depth, the temperature data show a typical sinusoidal diurnal behavior at all depths (Fig. 1 a). 1 % (Fig. 1 b). 5 %) occurred before dawn (02:00–03:00). 1 % (Fig. 1 b). 8 %) was observed before dawn (04:00–05:00). The water content data also show a sinusoidal diurnal behavior. Although there are laboratory experiments [60], which measured the vapor diffusion in porous medium directly, it is very difficult to observe the water vapor transport in situ directly.

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