Overland Flow Dynamics and Solute Transport

This book provides essential background knowledge on a wide range of hydrological processes governing contaminant transport from soil to surface water across a range of scales, from hillslope to watershed. The mathematical description of these processes is based on both well-known and unique analytical solutions of different initial and boundary problems (primarily using methods from the kinematic wave theory and the reservoir/lumped-parameter concept), supported by numerical modelling studies. Some research topics, in particular several case studies, are illustrated by monitoring and experimental data analysis to show the importance of the research's applications in environmental practice and environmental education. Specific results concern the recognition of: (a) the effect of transient rainfallrunoffinfiltration partitioning on the chemical response of drainage areas to excess precipitation under certain field conditions related to the soil, hillslope characteristics, and contaminant properties; (b) soil erosion as a key factor that enhances the potential of adsorbed chemical transport in runoff; and (c) common tendencies in radionuclide behaviour in the near-surface environment contaminated by radioactive fallout from the Chernobyl (1986), Fukushima (2011) and the less known Kyshtym (1957) accidents, as well as from nuclear weapon tests in the atmosphere since 1952.

The book's goal is to provide a conceptual foundation enabling readers to apply scientific knowledge to solve practical problems in environmental hydrology and radiology. More specifically, the book presents the state-of-the-art approaches thatscientists and natural resources experts need in order to significantly improve the prediction of changes in the soilwater system chemistry due to human activities.

Synthesizes results in watershed hydrology, contaminant hydrology and hydrogeology Offers an interdisciplinary approach for formulation and solution of coupled hydrodynamic and chemical problems related to forecasting water pollution Presents a set of published and unpublished field data illustrating artificial radionuclide behavior in different near-surface environments Offers a new philosophy for assessment and prediction of environmental response to severe accidents at nuclear power units

Contenu

Part I. Response Mechanisms of Hydrological Processes in the Near-Surface Environment. 1. Surface Runoff Generation, Vertical Infiltration and Subsurface Lateral Flow.- 2. Rainfall-Induced Runoff and Subsurface Stormflow at the Hillslope Scale.- 3. Models of Dissolved Component Transport at the Hillslope Scale.- 4. Contaminant Sorption and Transport by Suspended Particles with Runoff.- Part II. Water Flow and Solute Transport Models at the Watershed Scale.- 5. A Short Review of Water Budget and Flow Models for a Lumped Watershed.- 6. Lumped-Parameter Models for Solute Transport with Runoff.- 7. Prediction of the Impact of Severe Accidents at NPP on Radionuclide Contamination of the Near-Surface Environment.- Index.