Comment on “A cost-effective device and methodology to compute aquifer transmissivity and piezometry from free-flowing artesian wells”: technical note published in Hydrogeology Journal (2022) 30:1917–1931, by Alix Toulier,Patrick Lachassagne,Heru Hendrayana,Arif Fadillah,and Hervé Jourde     

Perina  Tomas 《Hydrogeology Journal》2023,31(3):843-844

Hydrogeology Journal -  相似文献   

Discharge experiments simulating chemical evolution on the surface of Titan     

Kristof Plankensteiner  Bernd M. Rode  Tomas Mikoviny  Armin Hansel  Georg Fischer  Helmut O. Rucker 《Icarus》2007,187(2):616-619

Saturn's moon Titan has been considered as one of the few places in our Solar System, where atmospheric and surface conditions could have produced organic compounds essential as precursors for an evolution of life. The Cassini-Huygens mission has provided new data on Titan's atmosphere and surface, which enabled us to simulate the chemical processes occurring under these conditions. Possible lightning events on Titan cannot only produce higher hydrocarbons, but also allow surface water ice to participate in the reaction scenario, resulting in CHO, CHN, and CHON compounds including several molecules relevant for the formation of amino acids and nucleic acids.  相似文献   

Public-space planning in four Nordic cities: Symbolic values in tension     

Merle Jacob  Tomas Hellström 《Geoforum》2010,41(4):657-665

This article takes its point of departure in the assumption that values shape planning practices and that alternatively one can reconstruct such values from the way planning interventions are argued and evaluated. We contend that planners’ discourses involve implicit value commitments that are observable in their representations of public space and implicated in the results of public-space planning. The paper builds an empirical case from representations of public space elaborated in planning documents developed by planners in four medium-sized Nordic cities. We show how these planning representations form four thematic value clusters concerning urban public space, namely leisure-play, identity-unity, power-organization and unruliness-change. Together these clusters constitute a value framework which reveals a number of central tensions relating to the way that planners seek to balance order and spontaneity in public space. The paper concludes by outlining and discussing these values and the tensions they represent.  相似文献   

Atmospheric forcing of Fram Strait sea ice export: a closer look   总被引：2，自引：0，他引：2  

Maria Tsukernik  Clara Deser  Michael Alexander  Robert Tomas 《Climate Dynamics》2010,35(7-8):1349-1360

Fram Strait is the primary region of sea ice export from the Arctic and therefore plays an important role in regulating the amount of sea ice and freshwater within the Arctic. We investigate the variability of Fram Strait sea ice motion and the role of atmospheric circulation forcing using daily data during the period 1979–2006. The most prominent atmospheric driver of anomalous sea ice motion across Fram Strait is an east–west dipole pattern of Sea Level Pressure (SLP) anomalies with centers of action located over the Barents Sea and Greenland. This pattern, also observed in synoptic studies, is associated with anomalous meridional winds across Fram Strait and is thus physically consistent with forcing changes in sea ice motion. The association between the SLP dipole pattern and Fram Strait ice motion is maximized at 0-lag, persists year-round, and is strongest on time scales of 10–60 days. The SLP dipole pattern is the second empirical orthogonal function (EOF) of daily SLP anomalies in both winter and summer. When the analysis is repeated with monthly data, only the Barents center of the SLP dipole remains significantly correlated with Fram Strait sea ice motion. However, after removing the leading EOF of monthly SLP variability (e.g., the North Atlantic Oscillation), the full east–west dipole pattern is recovered. No significant SLP forcing of Fram Strait ice motion is found in summer using monthly data, even when the leading EOF is removed. Our results highlight the importance of high frequency atmospheric variability in forcing Fram Strait sea ice motion.  相似文献   

Comparison of three types of laser optical disdrometers under natural rainfall conditions     

Lisbeth Lolk Johannsen  Nives Zambon  Peter Strauss  Tomas Dostal  Martin Neumann  David Zumr 《水文科学杂志》2020,65(4):524-535

ABSTRACT

Optical disdrometers can be used to estimate rainfall erosivity; however, the relative accuracy of different disdrometers is unclear. This study compared three types of optical laser-based disdrometers to quantify differences in measured rainfall characteristics and to develop correction factors for kinetic energy (KE). Two identical PWS100 (Campbell Scientific), one Laser Precipitation Monitor (Thies Clima) and a first-generation Parsivel (OTT) were collocated with a weighing rain gauge (OTT Pluvio²) at a site in Austria. All disdrometers underestimated total rainfall compared to the rain gauge with relative biases from 2% to 29%. Differences in drop size distribution and velocity resulted in different KE estimates. By applying a linear regression to the KE–intensity relationship of each disdrometer, a correction factor for KE between the disdrometers was developed. This factor ranged from 1.15 to 1.36 and allowed comparison of KE between different disdrometer types despite differences in measured drop size and velocity.  相似文献   

Geochemistry and origin of volcanic rocks of the Andes (26°–28°S)     

Jaroslav Dostal  Marcos Zentilli  Juan C. Caelles  Alan H. Clark 《Contributions to Mineralogy and Petrology》1977,63(2):113-128

Mesozoic to Recent volcanic rocks from a transect of the Central Andes between latitudes 26 ° and 28 ° South in northern Chile and Argentina show chemical and temporal zonation with respect to the Peru-Chile trench. Jurassic to Eocene lavas occur closer to the trench and are comparable to calc-alkaline rocks of island arcs. Eastwards they are followed by Miocene to Quaternary sequences of typical continental margin calc-alkaline rocks which have higher contents of K, Rb, Sr, Ba, Zr, and REE and also higher K/Na and La/Yb ratios. The rocks occurring farthest from the trench have shoshonitic affinities. The distribution of major and trace elements is consistent with a model in which magmas were derived by anatexis of an upper mantle source already enriched in LILE and located above the descending oceanic slab. It is suggested that the chemical variations across the volcanic belt reflect systematic changes in the composition of the magmas due to a decreasing degree of partial melting with increasing depth, and probably also due to the heterogeneity of the source materials.  相似文献   

Partitioning of transition elements between clinopyroxene and garnet     

C. Dupuy  J. Dostal  J.M. Liotard  A. Leyreloup 《Earth and Planetary Science Letters》1980,48(2):303-310

Abundances of transition elements (Ti, V, Cr, Mn, Fe²⁺, Co, Ni, Cu and Zn) in coexisting clinopyroxene and garnet are used to estimate clinopyroxene/garnet partition coefficients for these elements. The analyzed samples include eclogites, granulites and peridotites. The partition coefficients are sensitive to the major element composition of the mineral phases, although for individual transition elements they correlate with different chemical parameters. The partition coefficients of Ti correlate with the (FeO/MgO)_garnet/(FeO/MgO)_{clinopyroxene} ratio thus suggesting that the partitioning of Ti is a sensitive indicator of the physical (temperature-pressure) conditions of equilibration.  相似文献   

Geochemistry of ophiolites from the Chamrousse complex (Belledonne Massif,Alps)   总被引：1，自引：0，他引：1  

J. L. Bodinier  C. Dupuy  J. Dostal  F. Carme 《Contributions to Mineralogy and Petrology》1982,78(4):379-388

The ophiolite complex of Chamrousse (Belledonne Massif, Alps), consists of mafic to ultramafic cumulates and non-cumulates metamorphosed to amphibolite facies grade. The non-cumulitic rocks are similar in chemical composition to recent ocean-floor olivine tholeiites (both N-type and enriched P-type). The distribution of lithophile elements shows that the non-cumulitic rocks represent several magmas of different parentage. The character of the magmas varies according to the time of emplacement.Geological and geochemical data suggest that the Chamrousse complex was formed at a spreading oceanic ridge. The dynamic partial melting of an upper mantle diapir generated tholeiitic melt which decreased in amount and in REE contents. The first melt, enriched in light REE, was generated along the axis of the ridge while the second batch of melt, of lesser quantity and slightly depleted in light REE, was emplaced on the flank of the ridge. The third melt formed cross-cutting dikes with REE abundances typical of N-type (strongly light REE depleted) mid-ocean ridge basalts.  相似文献   

Trace element geochemistry of the peridotite-gabbro-basalt suite from DSDP Leg 37     

J. Dostal  G.K. Muecke 《Earth and Planetary Science Letters》1978,40(3):415-422

REE abundances in gabbros and peridotites from Site 334 of DSDP Leg 37 show that these rocks are cumulates produced by fractional crystallization of a primitive oceanic tholeiite magma. They may be part of a layered oceanic complex. The REE distributions in the residual liquids left after such a fractionation are similar to those of incompatible element-depleted oceanic tholeiites. The REE data indicate that the basalts which overlie the gabbro-peridotite complex, are not genetically related to plutonic rocks.  相似文献   

Geochemistry of calc-alkaline volcanic rocks from southeastern Iran (kouh-e-shahsavaran)     

C. Dupuy  J. Dostal   《Journal of Volcanology and Geothermal Research》1978,4(3-4)

The Upper Tertiary to Quaternary volcanic complex of Kouh-e-Shahsavaran in southeastern Iran is composed of calc-alkaline rocks of island are type (high-alumina basalts, basic andesites, andesites and dacites) even though it was emplaced on the continental basement. The volcanic rocks of the complex are genetically related and were probably derived by low-pressure fractional crystallization of high-Al basalts. The anomalously high content of Sr in some rocks probably reflects an accumulation of plagioclase. The trace element data are consistent with the origin of the parental magma by partial melting of an “enriched” upper mantle peridotite.  相似文献