Modelling surface flow/subsurface flow interactions with the Systems Hydrologique Europeen
Title | Modelling surface flow/subsurface flow interactions with the Systems Hydrologique Europeen PDF eBook |
Author | J C. Bathurst |
Publisher | |
Pages | |
Release | 1980 |
Genre | |
ISBN |
Models of Surface-subsurface Flow Interaction in an Ephemeral Channel
Title | Models of Surface-subsurface Flow Interaction in an Ephemeral Channel PDF eBook |
Author | David Lewis Freyberg |
Publisher | |
Pages | 212 |
Release | 1981 |
Genre | Grondwatervloei |
ISBN |
Modeling Interactions of Surface-Subsurface Flow Using a Free-Surface Overland Flow Boundary Condition in a Parallel Flow Simulator
Title | Modeling Interactions of Surface-Subsurface Flow Using a Free-Surface Overland Flow Boundary Condition in a Parallel Flow Simulator PDF eBook |
Author | R. M. Maxwell |
Publisher | |
Pages | 3 |
Release | 2005 |
Genre | |
ISBN |
Models incorporating interactions between surface and subsurface flow are commonly based on the conductance concept that presumes a distinct interface at the land surface, separating the surface from the subsurface domain. In these models the subsurface and surface domains are linked via an exchange flux that depends upon the magnitude and direction of the hydraulic gradient across the interface and a proportionality constant (a measure of the hydraulic connectivity). Because experimental evidence of such a distinct interface is often lacking in the field, a more general coupled modeling approach would be preferable. We present a more general approach that incorporates a two-dimensional overland flow simulator into the parallel three-dimensional variably saturated subsurface flow code ParFlow developed at LLNL. This overland flow simulator takes the form of an upper, free-surface boundary condition and is, thus, fully integrated without relying on the conductance concept. Another advantage of this approach is the efficient parallelism of ParFlow, which is exploited by the overland flow simulator. Several verification and simulation examples are presented that focus on the two main processes of runoff production: excess infiltration and saturation. The usefulness of our approach is demonstrated in an application of the model to an urban watershed. The influence of heterogeneity of the shallow subsurface on overland flow and transport is also examined. The results show the uncertainty in flow and transport predictions due to heterogeneity. This is important in determining, for example, total maximum daily loads of surface water systems.
Groundwater-surface Water Interaction
Title | Groundwater-surface Water Interaction PDF eBook |
Author | Corinna Abesser |
Publisher | |
Pages | 228 |
Release | 2008 |
Genre | Groundwater |
ISBN |
Selected papers from a symposium on A new Focus on Integrated Analysis of Groundwater-Surface Water Systems, held during the International Union of Geodesy and Geophysics XXIV General Assembly in Perugia, Italy, 11-13 July 2007.
Modelling Surface and Sub-Surface Flows
Title | Modelling Surface and Sub-Surface Flows PDF eBook |
Author | |
Publisher | Elsevier |
Pages | 404 |
Release | 1988-06-01 |
Genre | Computers |
ISBN | 0080870260 |
Modelling Surface and Sub-Surface Flows
Groundwater-Surface Water Interactions
Title | Groundwater-Surface Water Interactions PDF eBook |
Author | Habil. Jörg Lewandowski |
Publisher | MDPI |
Pages | 438 |
Release | 2020-12-10 |
Genre | Science |
ISBN | 3039289055 |
Recent years have seen a paradigm shift in our understanding of groundwater–surface water interactions: surface water and aquifers were long considered discrete, separate entities; they are now understood as integral components of a surface–subsurface continuum. This book provides an overview of current research advances and innovative approaches in groundwater–surface water interactions. The 20 research articles and 1 communication cover a wide range of thematic scopes, scales, and experimental and modelling methods across different disciplines (hydrology, aquatic ecology, biogeochemistry, and environmental pollution). The book identifies current knowledge gaps and reveals the challenges in establishing standardized measurement, observation, and assessment approaches. It includes current hot topcis with environmental and societal relevance such as eutrophication, retention of legacy, and emerging pollutants (e.g., pharmaceuticals and microplastics), urban water interfaces, and climate change impacts. The book demonstrates the relevance of processes at groundwater–surface water interfaces for (1) regional water balances and (2) quality and quantity of drinking water resources. As such, this book represents the long-awaited transfer of the above-mentioned paradigm shift in understanding of groundwater–surface water interactions from science to practice.
Simulation of Flow in Porous Media
Title | Simulation of Flow in Porous Media PDF eBook |
Author | Peter Bastian |
Publisher | Walter de Gruyter |
Pages | 224 |
Release | 2013-07-31 |
Genre | Mathematics |
ISBN | 3110282240 |
Subsurface flow problems are inherently multiscale in space due to the large variability of material properties and in time due to the coupling of many different physical processes, such as advection, diffusion, reaction and phase exchange. Subsurface flow models still need considerable development. For example, nonequilibrium effects, entrapped air, anomalous dispersion and hysteresis effects can still not be adequately described. Moreover, parameters of the models are diffcult to access and often uncertain. Computational issues in subsurface flows include the treatment of strong heterogeneities and anisotropies in the models, the effcient solution of transport-reaction problems with many species, treatment of multiphase-multicomponent flows and the coupling of subsurface flow models to surface flow models given by shallow water or Stokes equations. With respect to energy and the environment, in particular the modelling and simulation of radioactive waste management and sequestration of CO2 underground have gained high interest in the community in recent years. Both applications provide unique challenges ranging from modelling of clay materials to treating very large scale models with high-performance computing. This book brings together key numerical mathematicians whose interest is in the analysis and computation of multiscale subsurface flow and practitioners from engineering and industry whose interest is in the applications of these core problems.