Editor��s message: Hydrogeology Journal news about staff and Editors�� Choice articles     

Clifford I. Voss 《Hydrogeology Journal》2011,19(5):957-958

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The Fifth International Geological Congress, Washington, 1891     

Clifford M. Nelson 《《幕》》2006,29(4):279-286

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IGU study group on rapid geomorphological hazards and the IGU commission on coastal geomorphology     

Clifford Embleton 《GeoJournal》1990,20(3):337-337

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Celebrating 50 years of SWIMs (Salt Water Intrusion Meetings)     

Vincent E. A. Post  Gualbert Oude Essink  Adam Szymkiewicz  Mark Bakker  Georg Houben  Emilio Custodio  Clifford Voss 《Hydrogeology Journal》2018,26(6):1767-1770

The Salt Water Intrusion Meetings, or SWIMs, are a series of meetings that focus on seawater intrusion in coastal aquifers and other salinisation processes. 2018 marks the 50th year of the SWIM and the 25th biennial meeting. The SWIM proceedings record half a century of research progress on site characterisation, geophysical and geochemical techniques, variable-density flow, modelling, and water management. The SWIM is positioning itself to remain a viable platform for discussing the coastal aquifer management challenges of the next 50 years.  相似文献   

Editor’s Message: The 2017 Editors’ Choice articles     

Clifford?I.?VossEmail author 《Hydrogeology Journal》2018,26(1):1-2

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Editors’ message: Online re-publication of legacy articles on the occasion of Hydrogeology Journal’s 20th anniversary, 1992–2012     

Clifford I. Voss  Sue M. Duncan 《Hydrogeology Journal》2012,20(8):1433-1439

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Editor’s message: Editors’ Choice articles for 2011 and upcoming theme issues     

Clifford I. Voss 《Hydrogeology Journal》2012,20(3):413-413

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Joint Inversion of Body-Wave Arrival Times and Surface-Wave Dispersion for Three-Dimensional Seismic Structure Around SAFOD   总被引：2，自引：0，他引：2  

Haijiang Zhang  Monica Maceira  Philippe Roux  Clifford Thurber 《Pure and Applied Geophysics》2014,171(11):3013-3022

We incorporate body-wave arrival time and surface-wave dispersion data into a joint inversion for three-dimensional P-wave and S-wave velocity structure of the crust surrounding the site of the San Andreas Fault Observatory at Depth. The contributions of the two data types to the inversion are controlled by the relative weighting of the respective equations. We find that the trade-off between fitting the two data types, controlled by the weighting, defines a clear optimal solution. Varying the weighting away from the optimal point leads to sharp increases in misfit for one data type with only modest reduction in misfit for the other data type. All the acceptable solutions yield structures with similar primary features, but the smaller-scale features change substantially. When there is a lower relative weight on the surface-wave data, it appears that the solution over-fits the body-wave data, leading to a relatively rough V _s model, whereas for the optimal weighting, we obtain a relatively smooth model that is able to fit both the body-wave and surface-wave observations adequately.  相似文献   

Estimation of regional-scale groundwater flow properties in the Bengal Basin of India and Bangladesh     

Holly A. Michael  Clifford I. Voss 《Hydrogeology Journal》2009,17(6):1329-1346

Quantitative evaluation of management strategies for long-term supply of safe groundwater for drinking from the Bengal Basin aquifer (India and Bangladesh) requires estimation of the large-scale hydrogeologic properties that control flow. The Basin consists of a stratified, heterogeneous sequence of sediments with aquitards that may separate aquifers locally, but evidence does not support existence of regional confining units. Considered at a large scale, the Basin may be aptly described as a single aquifer with higher horizontal than vertical hydraulic conductivity. Though data are sparse, estimation of regional-scale aquifer properties is possible from three existing data types: hydraulic heads, ¹⁴C concentrations, and driller logs. Estimation is carried out with inverse groundwater modeling using measured heads, by model calibration using estimated water ages based on ¹⁴C, and by statistical analysis of driller logs. Similar estimates of hydraulic conductivities result from all three data types; a resulting typical value of vertical anisotropy (ratio of horizontal to vertical conductivity) is 10⁴. The vertical anisotropy estimate is supported by simulation of flow through geostatistical fields consistent with driller log data. The high estimated value of vertical anisotropy in hydraulic conductivity indicates that even disconnected aquitards, if numerous, can strongly control the equivalent hydraulic parameters of an aquifer system.  相似文献   

Introduction to the 4th Mars Polar Science and Exploration Conference special issue: Five top questions in Mars polar science     

K.E. Fishbaugh  C.S. Hvidberg  S. Clifford  A. Haldemann  J.W. Head  M. Koutnik  W.J. Ammann 《Icarus》2008,196(2):305-317

As an introduction to this Icarus special issue for the 4th Mars Polar Science and Exploration Conference, we discuss five key questions in Mars polar science, gleaned from plenary discussions and presentations held at the conference. These questions highlight major unknowns in the field. (1) What are the physical characteristics of the polar layered deposits (PLD), and how are the different geologic units within, beneath, and surrounding the PLD related? (2) How old are the PLD? And what are their glacial, fluvial, depositional and erosional histories? (3) What are the mass and energy budgets of the PLD, and what processes control these budgets on seasonal and longer timescales? (4) What chronology, compositional variability, and record of climatic change is expressed in the stratigraphy of the PLD? (5) How have volatiles and dust been exchanged between polar and non-polar reservoirs? And how has this exchange affected the past and present distribution of surface and subsurface ice?  相似文献