Erik Braudeau

Erik Braudeau
Institute of Research for Development | IRD

Senor scientist in Pedology and soil water physics

About

130
Publications
27,752
Reads
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1,553
Citations
Introduction
We have shown that the local and physical modelling of the water cycle in the natural environment cannot be developed only from a systemic and thermodynamic approach of the multi-scale organization of the soil medium. Our research goal is to develop a unique theoretical framework for modeling the hydro-functioning of the soil-plant- atmosphere system using physically-based equations developed according this new approach.
Additional affiliations
August 2011 - December 2013
Qatar Environment and Energy Research Institute
Position
  • Principal Investigator
Description
  • Installing a soil physics laboratory for the hydrostructural characterization of the pedostructure. This characterization included the shrinkage curve, water retention curve and hydraulic conductivity curve using new devices like TypoSoil and Hyprop.
September 2008 - July 2011
Institute of Research for Development
Position
  • Researcher
Description
  • Responsible of the soil physics laboratory. Methodological development of the hydrostructural characterization of soil samples in laboratory for the physical modelling of soil in the field using Kamel.

Publications

Publications (130)
Article
Full-text available
The pressure plate method is a standard method for measuring the pF curves, also called soil water retention curves, in a large soil moisture range from saturation to a dry state corresponding to an applied pressure of near 1500 kPa. However, the pressure plate can only provide discrete water retention curves represented by a dozen measured points....
Article
Full-text available
Using a new paradigm of soil characterization and modeling in agro environmental sciences, named hydrostructural pedology, we were able to show that the "green water" concept of agronomists corresponds exactly to the pedostructural water concept which was physically defined in this paradigm. The water in the pedostructure of soils is composed of tw...
Article
Full-text available
Following the recent theorization of the systemic approach of natural organizations such as soils, we give in this article the systemic definition of three fundamental variables of thermodynamics: temperature as the internal energy of molecules constituting a fluid phase ; entropy, as the ratio of two organization variables of the phase that are: t...
Article
Full-text available
The subject of this article is the dynamics of water in a soil pedostructure sample whose internal environment is subjected to a potential gradient created by the departure of water through surface evaporation. This work refers entirely to the results and conclusions of a fundamental theoretical study focused on the molecular thermodynamic equilibr...
Preprint
Full-text available
Vol. 13, Mai 2015 L'acceptation des nouveaux paradigmes ISSN 1762-5890 http://www.res-systemica.org/afscet/resSystemica/vol13/ResSystemica13-systeme-sol.pdf 2 Contenu
Article
Full-text available
We show how the systemic approach to represent and model the internal and external organizations of the soil, which is an innovative way in pedology, could have led us to the definition of nested and hierarchical thermodynamic systems and subsystems. Specifically, we review systemic theory of the natural environment, in our case-the representative...
Preprint
Full-text available
We show how the systemic approach to represent and model the internal and external organizations of the soil, which is an innovative way in pedology, could have led us to the definition of nested and hierarchical thermodynamic systems and subsystems. Specifically, we review systemic theory of the natural environment, in our case-the representative...
Preprint
The subject of this article is the dynamics of water in a soil pedostructure sample whose internal environment is subjected to a potential gradient created by the departure of water through surface evaporation. This work refers entirely to the results and conclusions of a fundamental theoretical study focused on the molecular thermodynamic equilibr...
Preprint
Full-text available
The subject of this article is the dynamics of water in a soil pedostructure sample whose internal environment is subjected to a potential gradient created by the departure of water through surface evaporation. This work refers entirely to the results and conclusions of a fundamental theoretical study focused on the molecular thermodynamic equilibr...
Article
Full-text available
Soil plays a pivotal role in enhancing global water and food security. Irrigation water constitutes more than 70% of the global water demand. The anticipated demographic increase and changing climate will impose more pressures on the global water and food systems. Therefore, and to achieve the target of “more crop per drop per area”, water manageme...
Article
The purpose of this study was to evaluate the use of the pedostructure concept to determine the soil available water capacity, specifically the field capacity (FC). Pedostructure describes the soil aggregate structure and its thermodynamic interaction with water. Specifically, this work compared the calculation of soil water-holding properties base...
Article
Full-text available
Soil aggregates structure (pedostructure) plays a pivotal role in regulating water and nutrient circulation, and consequently defines soil health, productivity, and water use efficiency. However, the soil aggregates structure is not currently considered in the quantification of soil-water holding properties. The authors applied a thermodynamic and...
Book
This book presents an in-depth guide to the subject matter and main points of hydrostructural pedology, as theorized for the first time. The authors focus on the underlying concepts, the purpose and role this field plays within agroenvironmental sciences. It is divided into two parts. Part 1 presents the theory behind hydrostructural pedology. The...
Chapter
This chapter presents an introduction to the second part of the book covering hydrostructural characterization of soil pedostructure. The hydrostructural characterization of soil consists of measuring the characteristic hydric properties of the pedostructure, which is to say of the “soil medium”, such that one can sample from it a representative vo...
Chapter
Le Moigne's general system (GS) model is the universal model of the organizational system implemented by man to take charge of the knowledge, use or management of organized natural spaces with soil being the supporting medium. This chapter presents three sub-systems: operating system (OS), information system (IS), steering system (SS) of the GS, wh...
Chapter
This chapter presents the introduction to the first part of the book covering systemic modeling of the pedostructure within the hierarchal hydrofunctional organization of the natural environment. Due to the need to implement sustainable agricultural or ecological systems, with an optimized and respectful use of the environment, the geographical inf...
Chapter
The soil water retention curve (WRC) is a relationship between the water content and the soil-water potential. There are two types of water retention curves based on the presence or absence of the interpedic saturation phase visible on the measured curve. A pressure plate is widely used as a method for measuring the WRC at higher suctions by using...
Chapter
An organization is a divine creation, whereas a system is a human creation. So one has to transform the natural organization into system for being allowed to study it. One can understand why there can be no room for teleology in a “natural system”, and, why the Descartes' four precepts are the basis for the physical systemic approach. One of the im...
Chapter
It is only very recently that the thermodynamic formulation for the soil-water retention curve “WRC” has been established in accordance with the two types of internal and external water contents (Wmi and Wma) of the pedostructure primary aggregates. Following the thermodynamic formulation of the soil-water retention curve “WRC”, one can know that i...
Chapter
This chapter shows where hydrostructural pedology fits in the agro-environmental sciences. Hydrostructural pedology plays a role that stayed unoccupied in the agro-environmental sciences for lack of scientific theory explaining the hydrostructural and thermodynamic functioning of its soil environment. To totally fulfill its role, the discipline mus...
Chapter
This chapter discusses J.L. Le Moigne's work on the phenomenological description of the general system theory, after providing some information about L. von Bertalanffy, extracted from the thesis by Pouvreau. Le Moigne presented two great ideas that appeared in the original description of the general system theory. The pedostructure is defined as t...
Article
The systemic approach to the natural environment is theorized here, in line with work by Bertalanffy and Le Moigne, accurately defining the notion of system with regard to organization, especially the organization of the natural environment. The concepts associated with “black box” or “representative elementary volume” (REV) used across the board i...
Chapter
Full-text available
This chapter deals with the problems in soil science. It begins with a description of the history of pedology. In the 1970s, methodologies for the morphological description of soil were set up, which confronted the questions of observation scale and typology with regard to the hierarchical structure of the soil and its dependence on its environment...
Book
Récemment théorisée, la pédologie hydrostructurale a fait son apparition au sein des sciences de la terre. Elle émerge de la jonction de la pédologie classique – science naturaliste de description des organisations hiérarchisées internes du sol et de leur répartition dans le paysage – avec la thermodynamique systémique de l’eau en interaction avec...
Article
Full-text available
L’approche systémique du milieu naturel est théorisée ici dans la ligne des travaux de Bertalanffy et de Le Moigne, définissant précisément la notion de système par rapport à celle d’organisation et en particulier de l’organisation du milieu naturel. Les concepts associés de « boîte noire » ou de « volume représentatif élémentaire » (REV) utilisée...
Article
Full-text available
Current soil water models do not take into account the internal organization of the soil medium and consequently ignore the physical interaction between the water film at the surface of solids that form the soil structure and the structure itself. In this sense, current models deal empirically with the physical soil properties, which are all genera...
Chapter
Full-text available
A fundamental problem that agro-environmental sciences have to face today is the lack of interdisciplinary linkages between the various disciplines dealing with agriculture and environment and the physics of the “soil medium” organization, which is the object of study of the pedology. Currently, the soil medium is far from being considered as the o...
Article
Abstract A fundamental problem that agro-environmental sciences have to face today is the lack of interdisciplinary linkages between the various disciplines dealing with agriculture and the environment and the physics of the soil medium, a natural soil-water-air organization, the object of study of pedology. Currently, the soil medium is far from b...
Article
Full-text available
Accurate measurement of the two soil moisture characteristic curves, namely, water retention curve (WRC) and soil shrinkage curve (SSC) is fundamental for the physical modeling of hydrostructural processes in vadose zone. This paper is the application part following the theory presented in part I about physics of soil medium organization. Two nativ...
Article
Full-text available
The equations used in soil physics to characterize the hydro-physical properties of the soil medium cannot be other than empirical since they do not take into account the multi-scale functional organization of the soil medium that is described in Pedology. To allow researching the correct formulation of the physical equations describing the soil me...
Article
Full-text available
This study involves a comparison between Kamel ® and Hydrus_1D ® for soil moisture simulation under two different soil types. Both models simulate the flux of water within the soil, in response to weather condition dynamics and water uptake by roots. The field sites under investigation are located in the Upper Cedar Creek Watershed (UCCW), Dekalb C...
Article
Full-text available
The poster presents a new device [TypoSoil®] for characterizing the hydrostructural properties of the soil medium organization. It intended to simultaneously and continuously measure both the shrinkage [V(W)] and the water potential [h(W)] characteristic curves for 8 cylindrical soil samples (~100 〖"cm" 〗^"3" ) at the same time during evaporation f...
Article
Full-text available
This study involves a field evaluation of the pedostructure-based model Kamel® and comparisons between Kamel® and the Hydrus-1D® model. Both models are commonly named 1D – soil water models because they simulate the flux of water within the soil, related to climate conditions variation and water uptake by roots. The field site used in the investiga...
Article
Current soil maps contain qualitative attributes which are challenging to integrate into agronomic models or decision support systems. In this paper, a new approach is proposed that will enable the use of soil maps as a suitable information system of soils hydrostructural properties for agronomic and environmental models. This enhancement is possib...
Article
Full-text available
The pedostructure concept characterizes a soil based upon soil structural properties to predict soil–water behavior. The goal of this work was to determine the impact of land management on the measured pedostructure parameters, the quantitative soil structural properties used for modeling soil–water behavior. Soil samples (fine, illitic, mesic, Aqu...
Conference Paper
Abstract Bridging the gap between the local scale of processes in soils and the mesoscopic field, watershed or ecosystem levels of description, becomes a major challenge nowadays particularly in addressing the questions of transdisciplinarity, transfer of scales, local to global change assessment, and empirical against physically-based characteriz...
Chapter
Although existing simulation tools can be used to study the impact of agricultural management on production activities in specific environments, they suffer from several limitations. They are largely specialized for specific production activities: arable crops/cropping systems, grassland, orchards, agro-forestry, livestock etc. Also, they often hav...
Article
Full-text available
The biological and geochemical processes in soil such as organic matter mineralization, microbiological activity, and plant alimentation can be accurately assessed and modeled only with the knowledge of the thermodynamic status of the soil medium where these processes take place. However, current soil water models do not define and characterize the...
Article
Full-text available
1] Internal stresses in soils evolve as a result of the various interactions among soil particles and the pore fluids in response to natural or human-induced activities. Whether attributed to suction, structure, or the various physicochemical forces that may develop, assessing the internal stresses in soils has been an active area of research in so...
Article
Full-text available
Current soil water models do not take into account the internal organization of the soil medium and, consequently, ignore the physical interaction between the water film at the surface of solids making the soil structure, and this structure. In that sense they empirically deal with the physical soil properties that are all generated from this soil...
Article
Full-text available
Current soil water models do not take into account the internal organization of the soil medium and, a fortiori, the physical interaction between the water film surrounding the solid particles of the soil structure, and the surface charges of this structure. In that sense they empirically deal with the physical soil properties that are all generate...
Article
The Restrained Ring Method (RRM) (Abou Najm et al., 2008) was presented as a tool to understand and measure the evolution of internal stresses in soils as they dry and shrink (Figure 1). This understanding holds key significance in soil characterization due to the effects that soil's internal stresses have on major soil behaviors including strain (...
Article
Full-text available
Cropping system models are typically used to simulate crop growth and development at the field scale. Spatial extension of the results to larger scales needs spatially referenced databases using Geographic Information Systems (GIS). However, GIS generally lack accuracy and pertinence in the soil characteristics and delineations that are required fo...
Article
There are several models of soil water that consider the soil medium as an active site for chemical, physical, and biological processes with a bimodal porous medium, micro- and macropore systems. Few of these models consider the soil medium as a structured medium with aggregates. However, none considered the swelling-shrinkage properties of these a...
Conference Paper
Time domain reflectometry (TDR) is a widely used tool for indirect measurement of soil moisture content. Empirical formulation is used to link the apparent dielectric constant of soil to the volumetric moisture content (Topp’s Equation: Topp et al., 1980) or gravimetric moisture content as a function of soil bulk density (Siddiqui and Drnevich Equa...
Article
Full-text available
The Agricultural Production and Externalities Simulator is a modular simulation system targeted at estimating the biophysical behaviour of agricultural production systems in response to the interaction of soil-weather and different options of agro-technical management. APES is currently meant to be used at field scale, simulating 1-D fluxes (future...
Conference Paper
Full-text available
A new conceptual and functional model of the soil-water medium organization, in which the internal structure of the soil horizon, named the pedostructure, is made up of swelling aggregates in a hierarchy of sizes, was recently presented. This representation leads to define a new paradigm for modeling the physical interaction between the soil struct...
Conference Paper
This paper examines how the incorporation of the concept of scaling as well as large-scale processes into student curriculum impact student learning and their decision making capabilities. With the wide range of scales of hydrological processes, spanning about eight orders of magnitude in space and time, defining large-scale hydrological modeling i...
Conference Paper
Accurate soil characterization is crucial for understanding soil-water interactions and allowing for better on-farm agricultural and environmental management. Current soil characterization methods lack quantitative attributes that integrate the soil mapping units with environmental and agronomical models. In this research we proposed a methodology...
Conference Paper
Residual stresses develop in soils as they shrink or swell. Assessing those stresses has always been an active area of research in soil science. Shrinkage induced cracking is a phenomenon that develops in soils as result of residual tensile stresses generation in soil structure. This paper presents a method to assess residual effective stresses in...
Article
Full-text available
Résumé - Un SIRS-Sols (Système d’Information à Référence Spatiale des Sols) a été créé pour le laboratoire de Pédologie au PRAM (Pôle de Recherche Agro-environnementale de la Martinique) avec pour objectif de fournir une information pédologique fiable et pertinente pour les activités agronomiques et environnementales du PRAM. Il a été élaboré selon...
Article
Full-text available
The swelling curve is generally studied as structural soil volume dependence on water content during swelling, and not on time. In this paper,weshowhowtheswellingcurvedefinedasthespecificvolumeof the soil as a function of time, V(t), represent the dynamic properties of the pedostructure where the shrinkage curve represents and char- acterizes the h...
Conference Paper
Current soil mapping units contain qualitative parameters, which makes it difficult to integrate them with other agronomic models or decision making support systems. In this work, we propose a fresh look at soil mapping and its functionality so that it can be spatially integrated with the current field and watershed scale and water resources models...
Conference Paper
Accurate representation of the top soil matrix with special attention to the scales present is important to the dynamics of water flow and to the fate of pollution at field, farm and watershed scales. This is also important from an agronomic stand point since agriculture is the main source of pollution at a time when many agronomic models still use...
Article
Allophanic soils behave as gels during a classical drying with an important irreversible shrinkage which can modify the soil physical properties. These soils are interesting in terms of mitigation of the greenhouse effect (C sequestration) and the knowledge of the true soils features are of importance. Like for silica gels, we use the CO2 supercrit...
Article
Full-text available
This paper describes the characteristic shrinkage curve of a soil as it dries. It also introduces a new method to measure specific soil moisture states such as permanent wilting point and field capacity using the shrinkage curve. The model considers the soil fabric as a non-rigid, aggregated and unsaturated soil water medium. Its functional paramet...
Article
Full-text available
Accurate representation of the top soil matrix with special attention to the scales present is important to the dynamics of water flow and fate of pollution at field, farm and watershed scales. It is also important from an agronomic stand point since agriculture still constitutes the main source of pollution at a time when many agronomic models sti...
Article
A systemic, process-based conceptual model of the soil-shrinkage curve (SC) for characterizing and parameterizing the soil–water medium is presented in this chapter. The model demonstrates a unique link between soil water properties of nonrigid aggregated soil medium and its internal volume change. This leads to a physically based and functional mo...