The Application of Telemetry to Large-Scale Horizontal Anisotropic Permeability Determinations by Surface Tiltmeter Survey     

Walter W. Loo  Klaus Franz  Gary R. Holzhausen 《Ground Water Monitoring & Remediation》1984,4(4):124-130

An advanced two-way radio link (transceiver units) and data logging system have provided a powerful means of real-time series data collection and analysis. The application of this telemetry system to surface tiltmeter surveys provides significant cost savings for testing and analysis of deep, large-scale horizontal anisotropic permeability and heterogeneity determinations.
The determination of horizontal anisotropic properties requires one pumping well and eight to 10 tiltmeter monitoring stations. The validity of the depth of the test may reach 4,000 feet below land surface. With the addition of one partially penetrating observation well, the entire three-dimensional anisotropic permeability can be determined. With the addition of a fully penetrating well, the storage coefficient can be determined as well as leakage property (including vertical permeability of the confining layers). An example test case was analyzed for horizontal anisotropic permeability with remarkable success despite relatively unfavorable detection conditions.
A thorough understanding of the geology overlying the aquifer system must be made in order to assess the applicability of the surface tiltmeter survey to large-scale horizontal anisotropic permeability determinations.  相似文献   

Comment on “Pleistocene glaciation of volcano Ajusco,central Mexico,and comparison with the Standard Mexican glacial sequence” by Sidney E. White and Salvatore Valastro,Jr.     

Klaus Heine 《Quaternary Research》1984,22(2):242-246

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The Baltic Sea 1994—Consequences of the hot summer and inflow events     

Dietwart Nehring  Wolfgang Matthäus  Hans-Ulrich Lass  Günther Nausch  Klaus Nagel 《Ocean Dynamics》1995,47(2):131-144

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The Baltic Sea in 1995— Beginning of a new stagnation period in its central deep waters and decreasing nutrient load in its surface layer     

Dietwart Nehring  Wolfgang Matthäus  Hans-Ulrich Lass  Günther Nausch  Klaus Nagel 《Ocean Dynamics》1995,47(4):319-327

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EDITORIAL     

Klaus  Helbig 《Geophysical Prospecting》1987,35(2):127-128

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Trends in Atlantic equatorial current variability     

Dr. William J. Emery  Dr. Walter Zenk  Dr. Klaus Huber  Dr. Pierre Rual  Dr. Paul Nowlan 《Ocean Dynamics》1987,40(6):261-276

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Evidence for the three-stage cooling history of olivine-porphyritic fluid droplet chondrules     

H.N. Planner  K. Keil 《Geochimica et cosmochimica acta》1982,46(3):317-330

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Mineralogy and petrology of the Abee enstatite chondrite breccia and its dark inclusions     

Alan E. Rubin  Klaus Keil 《Earth and Planetary Science Letters》1983,62(1):118-131

The Abee E4 enstatite chondrite breccia consists of clasts (many rimmed by metallic Fe, Ni), dark inclusions and matrix. The clasts and matrix were well equilibrated by thermal metamorphism, as evidenced by uniform mineral compositions, recrystallized chondrules, low MnO content of enstatite and high abundance of orthoenstatite. The clasts acquired their metal-rich rims prior to this metamorphic episode. The occurrence in Abee of relatively unmetamorphosed dark inclusions, clasts with nearly random magnetic orientations and a matrix with a uniform magnetic orientation [18,19] indicates that clast and matrix metamorphism occurred prior to the agglomeration of the breccia.The dark inclusions are an unusual kind of enstatite chondritic material, distinguished from the clasts and matrix by their relative enrichments in REE [21–23], low relative abundances of kamacite, total metallic Fe, Ni and silica, lower niningerite/(total sulfide) ratios, high relative abundances of oldhamite and martensite, smaller euhedral enstatite, more heterogeneous enstatite and metallic Fe, Ni, more calcic enstatite and more nickeliferous schreibersite.We propose the following model for the petrogenesis of the Abee breccia: The maximum metamorphic temperature of breccia parent material was?- 840°C (the minimum temperature of formation of Abee niningerite) and perhaps near 950–1000°C (the Fe-Ni-S eutectic temperature). Euhedral enstatite crystals in metallic Fe, Ni- and sulfide-rich areas grew at these metamorphic temperatures into pliable metal and sulfide. Breccia parent material was impact-excavated from depth, admixed with dark inclusions and rapidly cooled (700 to 200°C in about 2 hours) [15]. During this cooling, clast and matrix material acquired thermal remanent magnetization. Random conglomeration of clasts and unconsolidated matrix materials caused the clasts to have random magnetic orientations and the matrix areas to have net magnetic intensities of zero (due to the cancellation of numerous randomly oriented magnetic vectors of equal intensity in the matrix). A subsequent ambient magnetic field imparted a uniform net magnetic orientation to the matrix and caused the magnetic orientations of the clasts to be somewhat less random. The Abee breccia was later consolidated, possibly by shock or by shallow burial and very long-period/low-temperature (< 215°C) metamorphism.  相似文献   

Lithification of gas-rich chondrite regolith breccias by grain boundary and localized shock melting     

A. Bischoff  A.E. Rubin  K. Keil  D. Stöffler 《Earth and Planetary Science Letters》1983

We studied the fine-grained matrices (< 150 μm) of 14 gas-rich ordinary chondrite regolith breccias in an attempt to decipher the nature of the lithification process that converted loose regolith material into consolidated breccias. We find that there is a continuous gradation in matrix textures from nearly completely clastic (class A) to highly cemented (class C) breccias in which the remaining clasts are completely surrounded by interstitial, shock-melted material. We conclude that this interstitial material formed by shock melting in the porous regolith. In general, the abundances of solar-wind-implanted ⁴He and ²⁰Ne are inversely correlated with the abundance of interstitial, shock-melted, feldspathic material. Chondrites with the highest abundance of interstitial, melted material (class C) experienced the highest shock pressures and temperatures and suffered the most extensive degassing. It is this interstitial, feldspathic melt that lithifies and cements the breccias together; those breccias with very little interstitial melt (class A) are the most porous and least consolidated.  相似文献   

Stadtbedingte Niederschlagseffekte im Großraum von Mexiko City     

Prof. Dr. D. Klaus  Dr. E. Jaurequi  Prof. W. Lauer 《Theoretical and Applied Climatology》1983,33(3):275-288

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