Author: I. NayalPublisher:
ISBN:
Category :
Languages : en
Pages : 75
Book Description
Modelling Soil Water Flow and Solute Transport
Author: I. NayalModeling Preferential Water Flow and Solute Transport in Unsaturated Soil Using the Active Region Model
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Preferential flow and solute transport are common processes in the unsaturated soil, in which distributions of soil water content and solute concentrations are often characterized as fractal patterns. An active region model (ARM) was recently proposed to describe the preferential flow and transport patterns. In this study, ARM governing equations were derived to model the preferential soil water flow and solute transport processes. To evaluate the ARM equations, dye infiltration experiments were conducted, in which distributions of soil water content and Cl− concentration were measured. Predicted results using the ARM and the mobile-immobile region model (MIM) were compared with the measured distributions of soil water content and Cl− concentration. Although both the ARM and the MIM are two-region models, they are fundamental different in terms of treatments of the flow region. The models were evaluated based on the modeling efficiency (ME). The MIM provided relatively poor prediction results of the preferential flow and transport with negative ME values or positive ME values less than 0.4. On the contrary, predicted distributions of soil water content and Cl- concentration using the ARM agreed reasonably well with the experimental data with ME values higher than 0.8. The results indicated that the ARM successfully captured the macroscopic behavior of preferential flow and solute transport in the unsaturated soil.
Water Flow and Solute Transport in Soils
Author: David RussoPublisher: Springer Science & Business Media
ISBN: 3642779476
Category : Technology & Engineering
Languages : en
Pages : 323
Book Description
A year has passed since Eshel Bresler, my good friend and colleague, and a member of the editorial board of the Advanced Series in Agricultural Sciences, died suddenly while on a visit to the Chinese Academy of Sciences in Beijing. We had worked together for almost 30 years at the Institute of Soils and Water, ARO, The Volcani Center at Bet Dagan. At the very beginning of our scientific careers we cooperated directly and as a result one of our first publications was coauthored (Soil Sci. 101:205-209, 1966). Thereafter, our specific research interests diver sified, but we continued to work together, with similar approaches to research, and to strive towards the development of Israel soil science and its integration into general worldwide scientific progress. I don't need to emphasize Eshel's contribution to the understan ding of the processes governing water flow and solute transport pro cesses in soils and unsaturated zones. The contributions to this Volume by such a body of outstanding scientists shows the apprecia tion of the international scientific community to his research achievements.
Applied Soil Hydrology
Author: Viliam NovákPublisher: Springer
ISBN: 3030018067
Category : Science
Languages : en
Pages : 354
Book Description
This state-of-the-art book clearly explains the basic principles of soil hydrology and the current knowledge in this field. It particularly highlights the estimation and application of measurements and evaluation of soil-hydrophysical characteristics using simulation models, with a focus on elucidating the basic hydrophysical characteristics of soil, such as soil water potential and hydraulic conductivity, as well as the methods of measurement. It also addresses topics such as stony soil, water repellent soils, and water movement modeling in those media. The book presents soil hydrology in a simple way, while quantitatively expressing the soil water state and movement. It clearly and precisely describes basic terms of soil hydrology with a minimum of mathematics. It also includes the latest research findings in the field as well as the basics of the mathematical modeling of water movement in the soil-plant-atmosphere system (SPAS), using original research results to illustrate these issues. This book is of interest to all scientists and professionals in soil hydrology, including beginners, as well as those interested and working in hydrology in general and soil hydrology in particular. In addition, it can also be used by specialists and students in related fields like agronomy, forestry, meteorology, hydrology, environmental engineering, environmental protection, and geography.
Modelling of Water Flow and Solute Transport
Author: Nguyen Duy BinhPublisher: LAP Lambert Academic Publishing
ISBN: 9783847313236
Category :
Languages : en
Pages : 292
Book Description
The book focusses on one of the most complex and difficult problems in subsurface flow: the transport of water and dissolved substances through unsaturated soils. The predominantly vertical flow in the unsaturated zone is governing the processes of groundwater recharge as well as the input of any kind of waterborn substances that may be transported from the surface through the unsaturated zone into the groundwater body. The book focusses on analyzing the transport of water and solutes in unsaturated-saturated porous media with special emphasis on macropore effects due to plant roots - a significant effect in agricultural areas. Another specific strength of the present book is to be seen in the fact that a unique set of relatively large soil column tests has been conducted in a field setup, in which the effect of decayed plant roots channels on solute transport processes was investigated. These intensive field tests and the new results derived from the experiments provide a significant step forward in our understanding and quantification of the role of macropores connected with plant root channels.
Conceptual Models of Flow and Transport in the Fractured Vadose Zone
Author: National Research CouncilPublisher: National Academies Press
ISBN: 0309170990
Category : Science
Languages : en
Pages : 398
Book Description
Fluid flow and solute transport within the vadose zone, the unsaturated zone between the land surface and the water table, can be the cause of expanded plumes arising from localized contaminant sources. An understanding of vadose zone processes is, therefore, an essential prerequisite for cost-effective contaminant remediation efforts. In addition, because such features are potential avenues for rapid transport of chemicals from contamination sources to the water table, the presence of fractures and other channel-like openings in the vadose zone poses a particularly significant problem, Conceptual Models of Flow and Transport in the Fractured Vadose Zone is based on the work of a panel established under the auspices of the U.S. National Committee for Rock Mechanics. It emphasizes the importance of conceptual models and goes on to review the conceptual model development, testing, and refinement processes. The book examines fluid flow and transport mechanisms, noting the difficulty of modeling solute transport, and identifies geochemical and environmental tracer data as important components of the modeling process. Finally, the book recommends several areas for continued research.
Modeling Unstable Flow and Solute Transport in a Water Repellent Soils
Author: Hung Viet NguyenA Practical Guide to Groundwater and Solute Transport Modeling
Author: Karlheinz SpitzPublisher: Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 488
Book Description
Focusing on modeling applications, this outstanding reference provides a step-by-step, non-mathematical approach to constructing and using realistic workable groundwater models on a daily basis. Extensive detailed drawings, case studies, practical examples, and sample models illustrate important concepts. Includes data on hydrogeologic features and pollutants plus a glossary of terms.
Field-Scale Water and Solute Flux in Soils
Author: Kurt RothPublisher: Nelson Thornes
ISBN: 9783764325107
Category : Science
Languages : en
Pages : 308
Book Description
This book contains the proceedings of the first workshop held at Monte Verità near Ascona, Switzerland on September 24-29, 1989. The workshop was designed to survey the current understanding of water and solute transport through unsaturated soils under field conditions, and to foster research by discussing some unresolved key issues relative to transport modeling and experimentation in four "Think Tank" groups. The first part of this book consists of the reports prepared by the Think Tank groups, who discussed the following topics: modeling approaches, effective large scale properties, evaluation of filed properties, and the role preferential flow. The second part contains a selection of reviewed original contributions presented at the workshop, with topics ranging from the presentation of results from large scale experiments, to improved or new modeling approaches, and to legal or policy aspects. This book is intended for researchers in soil science, hydrology, and environmental engineering who have an interest in transport and reaction processes in the unsaturated zone. It will provide them with a representative sample of current research activities, and with a group discussion of future research directions in four important areas of water and solute transport.
Author: Hans-Jörg Vogel