Download or read book The Mathematical Modeling of Soil water nitrogen Phenomena written by and published by . This book was released on 1974 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1986 with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book General Technical Report SO written by and published by . This book was released on 1977 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mathematical Modeling of Soil Nitrogen Transformations written by and published by . This book was released on 1972 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mathematical Modeling of Groundwater Pollution written by Ne-Zheng Sun and published by Springer Science & Business Media. This book was released on 2014-07-08 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater is one of the most important resources in the world. In many areas, water supplies for industrial, domestic, and agricultural uses are de pendent on groundwater. As an "open" system, groundwater may exchange mass and energy with its neighboring systems (soil, air, and surface water) through adsorption, ion-exchange, infiltration, evaporation, inflow, outflow, and other exchange forms. Consequently, both the quantity and quality of groundwater may vary with environmental changes and human activities. Due to population growth, and industrial and agricultural development, more and more groundwater is extracted, especially in arid areas. If the groundwater management problem is not seriously considered, over extraction may lead to groundwater mining, salt water intrusion, and land subsidence. In fact, the quality of groundwater is gradually deteriorating throughout the world. The problem of groundwater pollution has appeared, not only in developed countries, but also in developing countries. Ground water pollution is a serious environmental problem that may damage human health, destroy the ecosystem, and cause water shortage.

Download or read book Soil Water Dynamics written by Arthur W. Warrick and published by Oxford University Press. This book was released on 2003-02-13 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a rigorous mathematical development of soil water and contaminant flow in variably saturated and saturated soils. Analytical and numerical methods are balanced: computer programs, among them MathCad and Fortran, are presented, and more than 150 practice and discussion questions are included. Students are thus exposed not only to theory but also to an array of solutions techniques. Those using the book as a reference will appreciate the careful development of basic flow equations, the inclusion of solutions and methodology currently available only in journals and proceedings volumes, and the examples and calculations directly applicable to their own work.

Download or read book The Soil as a Reactor written by Jörg Richter and published by . This book was released on 1987 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The approach followed in this book. Statics and kinetics. Dynamic approach. Balance approach. The system in thermodynamics. Fundamentals of the theory of potential. The macroscopic approach. Aggregation and buffering. The term "model". Classifying the processes in the soil. The organization of this book. Heat conduction in soils. Significance of heat dispersion in soils. Phenomena of heat dispersion. Examples of daily temperature courses in soils. Example of an annual course of the temperature. Heat conductivity and capacity in relation to soil composition and structure. Deriving the transport equation using local balance and principle of causality. Local balance for matter and energy without transformation. One-dimensional transport equation of matter and energy in a rigid system with continuous pores. The equation for heat transport. Analytical solutions of the heat transport equation with constant aT. The stationary case. Sudden change in temperature as boundary condition. Oscillating temperature as boundary condition. Numeriacal solution of the heat transport equation with constant aT. Heat balance of the soil and heat conversion. Estimating the soil-absorbed energy. Heat to evaporate 1 mm water. Gas regime of soils. The significance of the gas regime in the soil. Phenomena in soil gas regime. Profiles of CO2 and O2 concentrations in the soil. Cycles and depth profiles of CO2 production. Parameters of the gas regime in soils. The apparent diffusion coefficient Ds. The storage of gases in the soil. Quantitative description of the gas regime in soils. Extending the transport equation. Partial pressure and diffusive gas transport. Solving the equation of gas regime. An analytical solution for the stationary case. Numerical solution for a stationary example. Applications of the gas transport and gas regime equation. The measurement of the diffusion coeficient Ds. The "tortuous" macropore as a structure model. Vapour flow in the soil. Micro-anoxia as a problem of aeration, and the redoxpotencial Eh. Soil water regime. The significance of soil water; annual balances. Phenomena of soil water flow. Water tension and water content profiles in the soil. Flows at the boundary area and in the soil. Hydraulic conductivity and the moisture retention curve. The hydraulic conductivity K( m). The moisture retention curve m(0). The water regime equation. The local water balance. The equation for the water flow qw. The hydraulic potential h. Different formulations of the water transport equation. Characteristic flow conditions of water in the bare soil. Equilibrium and quasi-equilibrium. Stationary and quasi-stationary conditions. Non-stationary flow. Applications and numerical solutions for the water regime equation. Moisture equilibrium in the soil. stationary flow in the soil during drying in summer. Solution methods for non-stationary flow. Simple water regime models for the flat, homogeneous cropped soil; the root uptake function P(z,t). Calculating the evapotranspiration E. The water regime of a wheat field on a loess-Parabraunerde. Regime of matter in soils. Significance of "matter" in the soil. Extension of the transport the transport models. Phenomena of ion flows. Movement of non-interacting ions during winter. Movement of interacting ions during winter. Paramenters of solute transport. Transport parameter: effective dispersion coefficient Db. Quantity/intensity relation for compenents that do interact with the soil matrix; the specific storage capacity B. Specific storage capacity C (and the diffusion coefficient D). Coupled transport flows of components that do not interact with the soil matrix. General description of coupled transport. Transport of dissolved non-interacting components in the soil. Particle charge. Introduction to reaction dynamics. Fundamentals of the course of reactions. Order of elementary reactions in homogeneous systems. A special case: second-order reactions of sigmoidal shape. Complex reactions in homogeneous systems. Heterogeneous reactions (interactions with the surfaces of solids). Models for reactive components and ions in the soil. Dynamic description of interactions of substances with the solid phase. Description of interactions of ions with charged surfaces of the solid phase (ions-exchange). Simple regime models of substances in the soil. Models for nitrification and simultaneous movement of nitrogen. Simulating the nitrogen regime of loess field soils during winter. A site model for the displacement of physically interacting ions for the example potassium. Simulating the degradation of herbicides in soils. Simulating the behaviour of heavy metals in the soil. "Complete"models of material components regime. Looking ahead. Beyond the assumptions. The soil as a non-rigid solid. Mechanical deformations and changes of the state of stress. Mechanical cause-and-effect relations. Changes of the parameters with mechanical deformations. The explicit modelling of nutrient uptake by plants. Field and regional models. Simulating solute transport in heterogeneous pore systems. Geostatistical formulation of spatial variability. Combining deterministic and stochastic approaches: Monte-Carlo simulation of salt transport. Alternative approaches: plate and compartment models. Modelling soil development. Appendix. Numerical solutions for non-stationary water transport and for solute transport under stationary flow conditions. Vertical solute movement under stationary flow conditions. Vertical water transport. Difference formulationwith the help of the Taylor equation. Gas solubilities in water. Conversion of units. List of symbols and indices.

Download or read book Sourcebook NOx Control Technology Data written by Lisa M. Campbell and published by . This book was released on 1991 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Microbial Ecology written by K.C. Marshall and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Committee on Microbial Ecology (ICOME) sponsors both the Interna tional Symposium on Microbial Ecology, held in various parts of the world at three-year intervals, and the publication of Advances in Microbial Ecology. Advances was estab lished to provide a vehicle for in-depth, critical, and even provocative reviews in microbial ecology and is now recognized as a major source of information for both practicing and prospective microbial ecologists. The Editorial Board of Advances nor mally solicits contributions from established workers in particular areas of microbial ecology, but individuals are encouraged to submit outlines of unsolicited contributions to any member of the Editorial Board for consideration for pUblication in Advances. Chapters in Volume 11 of Advances in Microbial Ecology include those on micro bial transformations of chitin by G. W. Gooday, organic sulfur compounds by D. P. Kelly and N. A. Smith, and phosphorus, including its removal in waste water treatment plants, by D. F. Toerien, A. Gerber, L. H. Lotter, and T. E. Cloete. The importance of diffusion processes in microbial ecology is discussed by A. L. Koch, and 1. I. Prosser reviews the application of mathematical modeling to nitrification processes. Considera tions of particular ecosystems include the Antarctic by D. D. Wynn-Williams and Australian coastal microbial mats by G. W. Skyring and 1. Bauld. Other chapters include the regulation of N2 fixation by H. W.

Download or read book Soil Water Models written by R. DeJong and published by Research Branch, Agriculture Canada. This book was released on 1984 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected bibliography on southern range management 1973 1978 written by Southern Forest Experiment Station (New Orleans, La.) and published by . This book was released on 1980 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Groundwater 2000 written by Poul L. Bjerg and published by CRC Press. This book was released on 2020-08-18 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings, with cd-rom, present a comprehensive overview of advances in groundwater research. The five main topics covered are: aquifers and contaminant distribution; groundwater quality; natural attenuation; remediation technologies and groundwater protection. Groundwater 2000 is a useful resource to both scientists and to those working in the field.

Download or read book A Bibliography of Quantitative Ecology written by Vincent Schultz and published by . This book was released on 1976 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Reporting Series written by and published by . This book was released on 1991 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NBS Special Publication written by and published by . This book was released on 1980 with total page 964 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Research in the United States and Canada 1978 written by Pauline H. Gurewitz and published by . This book was released on 1980 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: