Assessment of Soil Water Thermodynamic to Unify Water Retention Curve by Pressure Plates and Tensiometer| Chapter 5 | Novel Perspectives of Geography, Environment and Earth Sciences Vol. 3

 In soil skill, skilled are two famous standard procedures for weighing the soil liquid characteristic curve: the pressure plate plan providing the pF curve and the tensiometer providing the soil assimilation pressure curve. These two practical curves are mainly used for typifing and posing the soil water characteristics. The two approaches are established two very various calculation ideas, and material unity of the calculated variables has never existed illustrated. The currently thermodynamic expression of the pedostructure water memory curve h(W) admits us examining this unity, two together in theory and experimentally. This authorizes the object of the item. We establish that the pressure plate arrangement supports correct calculation points of the water memory curve of the pedostructure h(W) but on the condition that h is not deliberate usually, as prepared the air pressure used to the sample. Instead, in accordance with the thermodynamic belief grown attending, h must be determined as the mathematical of the air pressure used to the pedostructure sample to correspond to the assimilation pressure straightforwardly calculated for one tensiometer. We therefore show by virtue of what the hydrostructural limits of the hypothetical curve equating maybe supposed from some calculated curve, however calculation method. An use instance utilizing published pF curves is likely.

Author(s) Details:

Erik Braudeau,
Qatar Environment and Energy Research Institute, Qatar Foundation, Doha, Qatar and Pédologie Hydrostructurale, Institut de Recherche pour le Développement France Nord, Institut de Recherche Pour le Développement, Bondy, France.

Gaghik Hovhannissian,
Unité Mixte de Recherche 242, Institut d'Ecologie et des Sciences de l'Environnement de Paris, Institut de Recherche pour le Développement France Nord, Institut de Recherche Pour le Développement, Bondy, France.

Amjad T. Assi,
Qatar Environment and Energy Research Institute, Qatar Foundation, Doha, Qatar and Biological and Agricultural Engineering Department, Texas A&M University, College Station, TX, USA.

Rabi H. Mohtar,
Biological and Agricultural Engineering and Zachry Departments of Civil Engineering, Texas A&M University, College Station, TX, USA.

Please see the link here: https://stm.bookpi.org/NPGEES-V3/article/view/9375

Thermodynamic Formulation of the Pedostructure Water Retention and Shrinkage Curves: An Approach to Soil Medium Organization| Chapter 4 | Novel Perspectives of Geography, Environment and Earth Sciences Vol. 3

 The two characteristic soil moisture curves: the soil water retention curve and the shrinkage curve, necessary for the physical modeling of the hydrological and agronomic properties of the soil are, still today, entirely empirical. They have been established so far without referring to the hydrostructural and thermodynamic properties of the pedostructure, nor to the internal and hierarchical organization of the soil pedon and its horizons which are described in Hydrostructural Pedology. On the contrary, this article presents the development of these equations according to the systemic and thermodynamic paradigm of this new scientific discipline of earth sciences.  We show how the aqueous phase of the pedostructure is divided into two types of water positioned differently in the pedostructure: one in the plasma porosity of the primary aggregates and the other outside the primary aggregates in the inter-aggregate porosity. The thermodynamic equilibrium established between these two types of water has been put into equations to represent the pedostructural water retention curve h(W) resulting from this equilibrium: the suction pressure of the pedostructure as a function of the water content. Using information from simultaneous measurements of both curves, the new equations were put to the test and the theory was verified.  The implications of these findings for physical modelling in agro-environmental sciences are discussed.

Author(s) Details:

Erik Braudeau,
Qatar Foundation, Qatar Environment and Energy Research Institute, Doha, Qatar and Institut de Recherche pour le Développement, Bondy, France.

Amjad T. Assi,
Qatar Foundation, Qatar Environment and Energy Research Institute, Doha, Qatar and Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, USA.

Hassan Boukcim,
Valorhiz SAS, Parc Scientifique Agropolis II Bat 6, Montferrier-sur-Lez, France.

Rabi H. Mohtar,
Biological and Agricultural Engineering Department, and Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA.

Please see the link here: https://stm.bookpi.org/NPGEES-V3/article/view/9374

Soil-water Modelling Framework Using Pedostructure and Structural Representative Elementary Volume (SREV) Concepts| Chapter 6 | Novel Perspectives of Geography, Environment and Earth Sciences Vol. 2

 Current soil water models do not give reason for the within institution of the soil medium, and so reject the material interplay betwixt the water film at the surface of the continuous that form the soil form and the building itself. Current models, thus, deal tentatively accompanying the tangible soil conditions, that are all a result of the interplay 'tween soil water and soil building. Since all processes in the soil medium are thermodynamically related to the soil water phase, this situation confines the posing and pairing of the miscellaneous processes happen in the soil medium. The aim concerning this item search out present a inclusive foundation for typifing and shaping the within soil arranging and allure hydrostructural characteristics on account of the form's interplay accompanying soil water depository and action. The paper longers the pedostructure idea, that allowed the inclusion of soil construction into equatings of water evenness and evolution in soils. It presents new soil-water thermodynamic ideas grown in the circumstances of the Structural Representative Elementary Volume idea (SREV). There was wonderful understanding middle from two points the Yolo earth soil description's fake seepage later combination and the calculated liquid sketch. With the understanding that the soil's hydrostructural institution and the happening thermodynamic characteristics symbolize the base for aforementioned union, this novel displaying foundation offers up new space for agro-material models expected accompanying the soil medium.

Author(s) Details:

Erik Braudeau,
Hydrostructural Pedology, Centre de Recherche Ile de France, IRD France Nord, Institut de Recherche pour le Développement, Bondy, France.

Rabi H. Mohtar,
Department of Biological and Agricultural Engineering, Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA.

Please see the link here: https://stm.bookpi.org/NPGEES-V2/article/view/9283

Thermodynamic Equation of the Pedostructure Hydric Conductivity | Chapter 1 | Research Developments in Science and Technology Vol. 8

The dynamics of water in a soil pedostructure sample whose interior environment is exposed to a potential gradient caused by the evaporation of water from the surface is the topic of this article. The findings and recommendations of a basic theoretical investigation into the molecular thermodynamic equilibrium of the two aqueous phases of the soil pedostructure are the exclusive subject of this paper. In this article, the systemic paradigm of hydrostructural pedology serves as a reminder of the novel ideas and descriptive variables of the hydro-thermodynamic equilibrium state of the soil medium that were established at the molecular level of the fluid phases of the pedostructure (water and air) in a previous article. They go beyond the traditional mono-scale description of soil water dynamics and provide access to the molecular description of water movement in the soil pedostructure. We have specifically examined and physically defined the water flux in the soil pedostructure at its three levels of organisational scale: the Eulerian flux at the macroscopic level of the entire pedostructure sample, the real flux of the two aqueous phases of the pedostructure through the inter primary-aggregates space, and the molecular flux of the mobile aqueous phase in the inter primary-aggregates space. For each of these fluxes at each of the three scale levels, the continuity equation can be written, and it is this continuity equation that establishes the space/time ratio required to construct the thermodynamic equation for water conductivity. The experimental findings completely support the theory, supporting the framework's systematic approach in the process.

Author(s) Details:

Erik Braudeau,

IRD, Institut de Recherche pour le Développement, France and Valorhiz - Parc scientifique Agropolis, F34980 Montferrier sur Lez, France.

Rabi H. Mohtar,

Faculty of Agricultural and Food Sciences, American University of Beirut, Lebanon and Department Biological and Agricultural Engineering (BAEN), Zachry Department Civil and Environmental Engineering (CVEN), Texas A&M University, USA.

Please see the link here: https://stm.bookpi.org/RDST-V8/article/view/7394