MODFLOW/MT3DMS-based reactive multicomponent transport modeling   总被引：4，自引：0，他引：4  

Prommer H  Barry DA  Zheng C 《Ground water》2003,41(2):247-257

This paper presents a three-dimensional, MODFLOW/MT3DMS-based reactive multicomponent transport model for saturated porous media. Based on a split-operator technique, the model, referred to as PHT3D, couples the transport simulator MT3DMS and the geochemical modeling code PHREEQC-2. Through the flexible, generic nature of PHREEQC-2, PHT3D can handle a broad range of equilibrium and kinetically controlled reactive processes, including aqueous complexation, mineral precipitation/dissolution, and ion exchange. The diversity of potential applications is demonstrated through simulation of five existing literature benchmarks and a new three-dimensional sample problem. The model might be applied to simulate the geochemical evolution of pristine and contaminated aquifers as well as their cleanup. The latter problem class includes the natural and enhanced attenuation/remediation schemes of a wide range of organic and inorganic contaminants. Processes/reactions not included in the standard PHREEQC-2 database but typical for this type of application (e.g., NAPL dissolution, microbial growth/decay) can be defined and included via the extensible PHREEQC-2 database file.  相似文献   

Implications of Stratigraphic and Paleoclimatic Records of the Last Interglaciation from the Nordic Seas     

Henning A. Bauch  Helmut Erlenkeuser  Pieter M. Grootes  Jean Jouzel 《Quaternary Research》1996,46(3):260-269

Climatic reconstruction of glacial to interglacial episodes from oxygen isotopes in sediment cores from the Nordic seas is complicated by strong local meltwater contributions to the oxygen isotope changes. Combination of benthic and planktic foraminiferal isotope data with foraminiferal abundances and ice-rafted debris (IRD) allows separation of local and global effects and subdivision of the marine oxygen isotope events 6.2–5.4, which include the last interglaciation, into: (1) a meltwater phase after glacial stage 6, recorded by large amounts of IRD and low foraminiferal abundance, indicating surface water warming; (2) an IRD-free period with high deposition rates of subpolar foraminifera and other CaCO₃pelagic components, recognized here as the “full” interglaciation; and (3) a phase with the recurrence of IRD and the demise of subpolar species. Comparison of ice-core records and marine data implies that the global climate during the last full interglaciation and that during the postdeglacial Holocene were similar. The records show no significantly different variations in the proxy data. In contrast, the oxygen isotopes of planktic foraminifera and ice cores indicate significant differences during each of the deglacial transitions (Terminations I and II) that preceded these two interglaciations. These suggest that during Termination II the climatic evolution in the Nordic seas was less affected by abrupt changes in ocean–atmosphere circulation than during the last glacial to interglacial transition.  相似文献   

Jurassic and Cretaceous palaeogeography and stratigraphic comparisons in the North Greenland-Svalbard region     

Henning Dypvik  Eckart Håkansson  Claus Heinberg 《Polar research》2002,21(1):91-108

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Herzinfarktereignis und Wetter     

Dipl.-Met. Henning Staiger 《Theoretical and Applied Climatology》1982,31(3):313-321

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Coastal and near-shore changes correlated with die-back in eel-grass (Zostera Marina,L.)     

Christian Christiansen  Henning Christoffersen  JØrgen Dalsgaard  Per NØrnberg 《Sedimentary Geology》1981,28(3):163-173

The die-back of eel-grass (Zostera marina, L.) is found to have played an important role with regard to near-shore sedimentation and coastal changes.In a natural harbour at Kyholm, Denmark a hiatus is found between silty sediments that date from about 4000 BC and overlying modern sandy sediments. It is suggested that this is a consequence of the die-back of eel-grass in the nineteen-thirties, resulting in mobilisation and disturbance of nearshore sediments and the shoreward movement of mobilised sandy material into the harbour. The coastal morphology of Kyholm was relatively stable from 1802 to 1933, but between 1933 and 1978 there have been two periods of drastic progradation correlated with die-back of eel-grass.  相似文献   

Intraplate tectonics in stable Europe as related to plate tectonics in the Alpine system     

Dr. Henning Illies 《International Journal of Earth Sciences》1975,64(1):677-699

Western Europe is traversed by the Rhinegraben rift system. The stages of graben formation evolved coincidentally with the culminations of compressional folding in the Alps. Rhinegraben rifting has been controlled by mantle diapirism, but the Alpine orogeny by subduction of lithosphere. Presumably, Alpine subduction forced compensating mantle uplift in the foreland. The Middle Eocene to Oligocene crustal spreading of the Rhinegraben implies a state of stress with a maximum horizontal component parallel to the graben axis (about 20?). In the same area, the Recent average direction of maximum compressive stress is of about 320? (NW), as calculated by in-situ stress measurements, fault-plane solutions of earthquakes and Recent crustal movements. The rotation of the stress components relative to the crust of stable Europe evolved subsequent to counterclockwise rotations of microplates in the Mediterranean. A model is proposed which ascribes these rotations to alterating shear motions of the Afro-Arabian macroplates relative to stable Europe exerting a ball-bearing effect to the intervenient microplates. The postulated motions are in accord with the patterns of inhomogeneous ocean floor spreading east and west of the African plate. The stages of Alpine plate collision had induced a significant readjustment of intraplate stress conditions, and deformation in the cratonic foreland of stable Europe.  相似文献   

The Bayesian bridge between simple and universal kriging   总被引：1，自引：0，他引：1  

Henning Omre  Kjetil B. Halvorsen 《Mathematical Geology》1989,21(7):767-786

Kriging techniques are suited well for evaluation of continuous, spatial phenomena. Bayesian statistics are characterized by using prior qualified guesses on the model parameters. By merging kriging techniques and Bayesian theory, prior guesses may be used in a spatial setting. Partial knowledge of model parameters defines a continuum of models between what is named simple and universal kriging in geostatistical terminology. The Bayesian approach to kriging is developed and discussed, and a case study concerning depth conversion of seismic reflection times is presented.  相似文献   

Bayesian kriging—Merging observations and qualified guesses in kriging     

Henning Omre 《Mathematical Geosciences》1987,19(1):25-39

Frequently a user wants to merge general knowledge of the regionalized variable under study with available observations. Introduction of fake observations is the usual way of doing this. Bayesian kriging allows the user to specify a qualified guess, associated with uncertainty, for the expected surface. The method will provide predictions which are based on both observations and this qualified guess.  相似文献   

Health in the Arctic and climate change     

Henning Sloth Pedersen 《Polar research》2007,26(2):104-106

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Directionally dependent strength and dilatancy behavior of soil–structure interfaces     

Stutz  Hans Henning  Martinez  Alejandro 《Acta Geotechnica》2021,16(9):2805-2820

Acta Geotechnica - Soil–structure interfaces typically exhibit a shear behavior that is independent of the direction of relative displacement due to symmetry in the solid material's...  相似文献