Soil water measurement : a practical handbook / / J. David Cooper ; with contribution from Richard H. Cuenca

• Record Nr.: UNINA9910830028203321
• Autore: Cooper David J. <1946->
• Pubbl/distr/stampa: Chichester, England : , : Wiley-Blackwell, , 2016; ©2016
• ISBN: 1-119-10603-6; 1-119-10602-8
• Descrizione fisica: 1 online resource (803 p.)
• Disciplina: 631.4/32
• Soggetti: Soil moisture - Measurement
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references and index.
• Nota di contenuto: Title Page; Table of Contents; Preface; Part I: Introduction; 1 Soil Water in Context; 1.1 What Is Soil Water?; 2 How Does Water in Soil Interact with the Soil Matrix, Air, Roots, Gravity and Other Substances Present?; 2.1 Static Properties of Soil Water; 2.2 Dynamic Properties of Soil Water; 2.3 Preferential Flow; 3 What Do We Need to Measure?; 3.1 Diffusivity; 3.2 Matric Flux Potential; 3.3 Sorptivity; 4 Spatial Variability; 4.1 Representative Elementary Volume; 4.2 Deterministic versus Random Variation; 4.3 Geostatistics; Part II: Water Content; 5 Definitions; 5.1 Basis for Expressing Water Content5.2 Standard Definition of Soil Water; 5.3 Measurement of Water Content; 6 Gravimetric Method; 6.1 Equipment Required; 6.2 Procedures; 6.3 Likely Problems with Gravimetric Sampling; 6.4 Direct Measurement of Bulk Density; 6.5 Indirect Measurement of Bulk Density: Gamma Ray Probes; 6.6 Conclusion; Appendix 6.A Scintillation Detectors; 7 Neutron Scattering; 7.1 Principles of the Method; 7.2 Types of Neutron Probe; 7.3 Access Tube Installation; 7.4 Accommodating Farming Operations; 7.5 Accuracy and Precision of Measurement; 7.6 Measurements in Access Tubes; 7.7 Calibration7.8 Measurements near the Surface; 7.9 Processing and Use of Data; 7.10 Cosmic-Ray Soil Moisture Observing System; 7.11 Radiological Safety; 8 Dielectric Methods; 8.1 Dielectrics - Basic Principles; 8.2 Factors Affecting Permittivity of Water; 8.3 Fundamentals ; of Electrical Circuits; 8.4 The Relationship between Soil Water Content and Permittivity; 8.5 Transmission Lines; 8.6 Practical Realisation of a Transmission Line System - Time Domain Reflectometry; 8.7 Capacitance Methods; 8.8 Theta and Profile Probes; 8.9 ECH2O Probe; 8.10 Hydra Probe; 8.11 Installation of Access Tubes for Dielectric Probes8.12 Permanent Installation of Rod-Type Probes; 8.13 Field Monitoring; 8.14 Soil Calibration; 8.15 Ground-Penetrating Radar; 8.16 Dielectric Methods - Conclusion; 9 Dual-Probe Heat-Pulse Sensors; 9.1 Introduction; 9.2 Principles of Operation; 10 Electrical Resistivity Imaging; 10.1 Introduction; 10.2 Theoretical Basis of ERI; 10.3 Measurement Methods; 10.4 Measurements in Practice; 10.5 Conclusion; Part III: Water Potential; 11 Water Potential Measurement; 11.1 Introduction; 11.2 Types of Sensor; 11.3 Sensitivity; 11.4 Response Time; 12 Tensiometers12.1 Components of a Tensiometer; 12.2 The Porous Barrier; 12.3 The Body Tube; 12.4 The Air Trap; 12.5 The Pressure Sensor; 12.6 Construction of Tensiometers; 12.7 Tensiometer Installation; 12.8 Time before Tensiometers can be Read Reliably after Filling; 12.9 Reading of Tensiometers; 12.10 Tensiometer Maintenance; 12.11 Quality Control of Tensiometer Readings; 12.12 Deep Water Potential Measurements; Appendix 12.A Pressure Transducers; Appendix 12.B De-aired Water; 13 Indirect Methods of Water Potential Measurement; 13.1 Introduction; 13.2 Resistance Block; 13.3 Equitensiometer