2,131 research outputs found
Groundwater in fractured bedrock environments: managing catchment and subsurface resources – an introduction
Full text linkHard rocks, including crystalline igneous, metamorphic and strongly cemented sedimentary and carbonate rocks, cover about 50% of the Earth's land surface (Singhal & Gupta 2010). Globally, the volume of groundwater contained in hard rock aquifers is not well constrained (Comte et al. 2012) but locally they can be important aquifers (MacDonald et al. 2012), albeit with low groundwater storage and poor primary porosity and permeability. Groundwater flow in these hard rocks is commonly observed to be associated with water-bearing discontinuities, such as fractures, joints and faults (Mazurek 2000; Berkowitz 2002; Font-Capo et al. 2012), and in the weathered regolith (Wright 1992; Chilton & Foster 1995; Deyassa et al. 2014). Structural elements such as fault zones also strongly govern the behaviour of these systems (Forster & Evans 1991; López & Smith 1995; Bense et al. 2013). The nature, abundance, orientation and connectivity of these water-bearing features are largely governed by the history and nature of structural deformation of the bedrock, and commonly impose strong anisotropic flow and transport parameters on these bedrock aquifers (Hsieh et al. 1985; Bour & Davy 1997; Mortimer et al. 2011). Weathering processes furthermore lead to an alteration of bedrock composition and associated aquifer properties resulting in enhanced fracture connectivity and an overall vertical stratification/zonation of bulk aquifer properties, ranging from highly altered shallow regolith horizons to more competent sparsely fractured bedrock at depth (Dewandel et al. 2006; Krásný & Sharp 2007; Lachassagne et al. 2011)
Tractatio Iuris Publici De Serenissimis Potentissimisque Ducibus Brunsvicensibus Et Luneburgensibus / D.O.M.A. Praeside ... Dn. Joh. Ulrico Pregizero ... In Illustri Collegio Ad Diem 10. Decembr. Placido Eruditorum Examini sistit Author Christian Ulrich Blum
Full text linkTRACTATIO IURIS PUBLICI DE SERENISSIMIS POTENTISSIMISQUE DUCIBUS BRUNSVICENSIBUS ET LUNEBURGENSIBUS / D.O.M.A. PRAESIDE ... DN. JOH. ULRICO PREGIZERO ... IN ILLUSTRI COLLEGIO AD DIEM 10. DECEMBR. PLACIDO ERUDITORUM EXAMINI SISTIT AUTHOR CHRISTIAN ULRICH BLUM
Tractatio Iuris Publici De Serenissimis Potentissimisque Ducibus Brunsvicensibus Et Luneburgensibus / D.O.M.A. Praeside ... Dn. Joh. Ulrico Pregizero ... In Illustri Collegio Ad Diem 10. Decembr. Placido Eruditorum Examini sistit Author Christian Ulrich Blum (1)
Titelblatt (1)
Prooemium. (3)
Caput I. (5)
Caput II. (9)
Caput III. (12)
Caput IV. (22)
Caput V. (29)
Caput VI. (47)
I. - V. (54
Supplementary movies of the dynamic rupture and tsunami models published in Ulrich et al. (2019)
No full text<p>Supplementary movies of the dynamic rupture and tsunami models published in Ulrich et al. (2019)</p>
<p>movie_Sulawesi_SR-cp.mov: Absolute slip rate (m/s) across the fault network during the earthquake. Author: Thomas Ulrich</p>
<p>movie_Sulawesi_wavefield-cp.mov: Absolute slip rate (m/s) and wavefield (absolute particle velocity in m/s) across the fault network during the earthquake. Author: Thomas Ulrich</p>
<p>SulawesiTanioka.mp4: Sea surface height (m) predicted by the tsunami scenario. Author: Stefan Vater</p>
<p>reference: Ulrich, T., Vater, S., Madden, E. H., Behrens, J., van Dinther, Y., van Zelst, I., Fielding, E. J., Liang, C. & Gabriel, A. A. (2019). Coupled, Physics-based Modeling Reveals Earthquake Displacements are Critical to the 2018 Palu, Sulawesi Tsunami. doi: 10.31223/osf.io/3bwqa.</p>
Catchment-scale heterogeneity of flow and storage properties in a weathered/fractured hard rock aquifer from resistivity and magnetic resonance surveys: implications for groundwater flow paths and the distribution of residence times
Full text linkGroundwater pathways and residence times are controlled by aquifer flow and storage properties,which, in weathered/fractured hard rock aquifers, are characterized by high spatial heterogeneity. Buildingon earlier work in a metamorphic aquifer in NW Ireland, new clay mineralogy and analyses of geophysical data provided high spatial resolution constraints on the variations in aquifer properties. Groundwater storage values derived from magnetic resonance sounding and electrical resistivity tomography were found to largely vary laterally and with depth, by orders of magnitude. The subsequent implementation of hill slope, two dimensional numerical groundwater models showed that incorporating heterogeneity from geophysical data in model parametrization led to the best fit to observations compared with a reference model based on borehole data alone. Model simulations further revealed that (1) strong spatial heterogeneity produces deeper, longer groundwater flow paths and higher age mixing, in agreement with the mixed sub-modern/modern ages (mostly<50 years) provided by independent tritium data, and (2) areas with extensive weathering/fracturing are correlated with seepage zones of older groundwater resulting from changes in the flow directions and are likely to act as drainage structures for younger groundwater on a catchment or regional scale. Implications for groundwater resilience to climate extremes and surface pollution are discussed together with recommendations for further research
Expatriate Assignments : comparison of Theory and Practice
No full textAuthor: Ulrich MeindlAbstract in englischer SpracheDiplomarbeit Universität Linz 201
Expatriate Assignments : comparison of Theory and Practice
No full textAuthor: Ulrich MeindlAbstract in englischer SpracheDiplomarbeit Universität Linz 201
Analysis of groundwater-level response to rainfall and recharge estimates in fractured hard rock aquifers, NW Ireland
Full text linkDespite fractured hard rock aquifers underlying over 65% of Ireland, knowledge of key processes controlling groundwater recharge in these bedrock systems is inadequately constrained. In this study, we examined 19 groundwater-level hydrographs from two Irish hillslope sites underlain by hard rock aquifers. Water-level time-series in clustered monitoring wells completed at the subsoil, soil/bedrock interface, shallow and deep bedrocks were continuously monitored hourly over two hydrological years. Correlation methods were applied to investigate groundwater-level response to rainfall, as well as its seasonal variations. The results reveal that the direct groundwater recharge to the shallow and deep bedrocks on hillslope is very limited. Water-level variations within these geological units are likely dominated by slow flow rock matrix storage. The rapid responses to rainfall (⩽2 h) with little seasonal variations were observed to the monitoring wells installed at the subsoil and soil/bedrock interface, as well as those in the shallow or deep bedrocks at the base of the hillslope. This suggests that the direct recharge takes place within these units. An automated time-series procedure using the water-table fluctuation method was developed to estimate groundwater recharge from the water-level and rainfall data. Results show the annual recharge rates of 42–197 mm/yr in the subsoil and soil/bedrock interface, which represent 4–19% of the annual rainfall. Statistical analysis of the relationship between the rainfall intensity and water-table rise reveal that the low rainfall intensity group (⩽1 mm/h) has greater impact on the groundwater recharge rate than other groups (>1 mm/h). This study shows that the combination of the time-series analysis and the water-table fluctuation method could be an useful approach to investigate groundwater recharge in fractured hard rock aquifers in Ireland
Ulrich Becher: An Introduction to the Life and Writings of this Contemporary German Author
No full textv, 29 p.Originally I had intended to treat all of his epic, lyric,
and dramatic works which were available to me. As my research
progressed, I realized, however, that a detailed investigation
of Becher's philosophy, literary form and imagery would be
impossible within the limitations of a thesis. Instead, I
chose to introduce this contemporary German author to an
English-speaking audience through a survey of his life and
works, followed by an analysis of three narratives representing
the three periods of Ulrich Becher's writing
Séminaire de l'IAO : Ulrich Theobald
No full text"Rough Terrain : Tactics and Technical Issues in Alpine Warfare in the High Qing Period" Jeudi 27 octobre 2016, Salle de réunion de l’IAO (R66), de 14h à 15h30 Ulrich Theobald (Ph.D. 2009) is a senior lecturer at the Department for Chinese and Korean Studies of the University of Tübingen, Germany. He is specializing in the economic, military, monetary and administrative history of late imperial China, and author of "War Finance and Logistics in Late Imperial China : A Study of the Second Jinc..
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