The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
A.h-d. Cheng - One of the best experts on this subject based on the ideXlab platform.
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Uncertainty analysis of Groundwater Flow with DRBEM
Engineering Analysis with Boundary Elements, 1997Co-Authors: K. El Harrouni, D. Ouazar, Luiz C. Wrobel, A.h-d. ChengAbstract:The reliability of Groundwater Flow numerical simulation is affected by the quality of input data of aquifer physical parameters. This paper presents an uncertainty analysis based on a first order approximation of covariances. A two-dimensional steady state Groundwater Flow problem is carried out by coupling the first-order uncertainty analysis with dual reciprocity boundary element method.
Goran Hellstrom - One of the best experts on this subject based on the ideXlab platform.
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Influence on thermal response test by Groundwater Flow in vertical fractures in hard rock
Renewable Energy, 2003Co-Authors: Signild Gehlin, Goran HellstromAbstract:In this paper different approaches to Groundwater Flow and its effect in the vicinity of a borehole ground heat exchanger are discussed. The common assumption that Groundwater Flow in hard rock may be modelled as a homogeneous Flow in a medium with an effective porosity is confronted and models for heat transfer due to Groundwater Flow in fractures and fracture zones are presented especially from a thermal response test point of view. The results indicate that Groundwater Flow in fractures even at relatively low specific Flow rates may cause significantly enhanced heat transfer, although a continuum approach with the same basic assumptions would suggest otherwise.
Henk Kooi - One of the best experts on this subject based on the ideXlab platform.
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Groundwater Flow as a cooling agent of the continental lithosphere
Nature Geoscience, 2016Co-Authors: Henk KooiAbstract:Groundwater Flow redistributes heat in the Earth’s crust. Numerical simulations of Groundwater Flow show net cooling of Groundwater basins, as well as cooling of the underlying lithosphere in areas where Groundwater Flows over large distances.
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Evolution of shallow Groundwater Flow systems in areas of degrading permafrost
Geophysical Research Letters, 2009Co-Authors: Victor F. Bense, Grant Ferguson, Henk KooiAbstract:[1] The recent increase in fresh-water discharge during low-Flow conditions as observed in many (sub-)Arctic Rivers has been attributed to a reactivation of Groundwater Flow systems caused by permafrost degradation. Hydrogeological simulations show how Groundwater Flow conditions in an idealized aquifer system evolve on timescales of decades to centuries in response to climate warming scenarios as progressive lowering of the permafrost table establishes a growing shallow Groundwater Flow system. Ultimately, disappearance of residual permafrost at depth causes a sudden establishment of deep Groundwater Flow paths. The projected shifts in Groundwater Flow conditions drive characteristic non-linear trends in the evolution of increasing Groundwater discharge to streams. Although the subsurface distribution of ice will markedly influence the system response, current modeling results suggest that late-stage accelerations in base Flow increase of streams and rivers, are to be expected, even if surface air temperatures stabilize at the current levels in the near future.
K. El Harrouni - One of the best experts on this subject based on the ideXlab platform.
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Uncertainty analysis of Groundwater Flow with DRBEM
Engineering Analysis with Boundary Elements, 1997Co-Authors: K. El Harrouni, D. Ouazar, Luiz C. Wrobel, A.h-d. ChengAbstract:The reliability of Groundwater Flow numerical simulation is affected by the quality of input data of aquifer physical parameters. This paper presents an uncertainty analysis based on a first order approximation of covariances. A two-dimensional steady state Groundwater Flow problem is carried out by coupling the first-order uncertainty analysis with dual reciprocity boundary element method.
Clifford I. Voss - One of the best experts on this subject based on the ideXlab platform.
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Permafrost thaw in a nested Groundwater-Flow system
Hydrogeology Journal, 2013Co-Authors: Jeffrey M. Mckenzie, Clifford I. VossAbstract:Groundwater Flow in cold regions containing permafrost accelerates climate-warming-driven thaw and changes thaw patterns. Simulation analyses of Groundwater Flow and heat transport with freeze/thaw in typical cold-regions terrain with nested Flow indicate that early thaw rate is particularly enhanced by Flow, the time when adverse environmental impacts of climate-warming-induced permafrost loss may be severest. For the slowest climate-warming rate predicted by the Intergovernmental Panel on Climate Change (IPCC), once significant Groundwater Flow begins, thick permafrost layers can vanish in several hundred years, but survive over 1,000 years where Flow is minimal. Large-scale thaw depends mostly on the balance of heat advection and conduction in the supra-permafrost zone. Surface-water bodies underlain by open taliks allow slow sub-permafrost Flow, with lesser influence on regional thaw. Advection dominance over conduction depends on permeability and topography. Groundwater Flow around permafrost and Flow through permafrost impact thaw differently; the latter enhances early thaw rate. Air-temperature seasonality also increases early thaw. Hydrogeologic heterogeneity and topography strongly affect thaw rates/patterns. Permafrost controls the Groundwater/surface-water-geomorphology system; hence, prediction and mitigation of impacts of thaw on ecology, chemical exports and infrastructure require improved hydrogeology/permafrost characterization and understanding.
