Engineering geology of Stockholm, Sweden

Persson, Lars

doi:10.1007/s100640050024

Cited by 13 publications

(11 citation statements)

References 6 publications

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“…Exposure at 90% RH, 250 ppb SO 2 , and 250 ppb NO 2 It is of interest to compare the results obtained for copper and iron samples exposed only to SO 2 or to SO 2 and NO 2 simultaneously, even though the results have been obtained under slightly different conditions. Previous investigations showed that the growth rate of the sulfite band-recorded by means of IRRAS-is significantly higher on copper surfaces when exposed to both SO 2 and NO 2 [7]. Thereby NO 2 reacts with water according to [9] …”

Section: Exposure At 80% Rh and 250 Ppb Somentioning

confidence: 98%

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Comparison of the early stages of corrosion of copper and iron investigated by in situ TM-AFM

Kleber¹,

Weissenrieder²,

Schreiner³

et al. 2002

Applied Surface Science

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Section: Exposure At 80% Rh and 250 Ppb Somentioning

confidence: 98%

“…The interaction between a water covered metal surface and SO 2 can be described by the following reaction sequence [7]:…”

Section: Exposure At 80% Rh and 250 Ppb Somentioning

confidence: 99%

Comparison of the early stages of corrosion of copper and iron investigated by in situ TM-AFM

Kleber¹,

Weissenrieder²,

Schreiner³

et al. 2002

Applied Surface Science

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“…7). The pre-Cambrian crystalline bedrock has dominant fracture zones in an E-W, WNW and NW direction (Persson 1998). Although important data in the area is available from the investigations of the planned tunnel such as a model for soil and bedrock stratification, groundwater head measurements and hydraulic tests, there are significant uncertainties.…”

Section: Case Studymentioning

confidence: 99%

Economic valuation of hydrogeological information when managing groundwater drawdown

et al. 2019

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A procedure is presented for valuation of information analysis (VOIA) to determine the need for additional information when assessing the effect of several design alternatives to manage future disturbances in hydrogeological systems. When planning for groundwater extraction and drawdown in areas where risks-such as land subsidence, wells running dry and drainage of streams and wetlands-are present, the need for risk-reducing safety measures must be carefully evaluated and managed. The heterogeneity of the subsurface calls for an assessment of trade-offs between the benefits of additional information to reduce the risk of erroneous decisions and the cost of collecting this information. A method is suggested that combines existing procedures for inverse probabilistic groundwater modelling with a novel method for VOIA. The method results in (1) a prior analysis where uncertainties regarding the efficiency of safety measures are estimated, and (2) a pre-posterior analysis, where the benefits of expected uncertainty reduction deriving from additional information are compared with the costs for obtaining this information. In comparison with existing approaches for VOIA, the method can assess multiple design alternatives, use hydrogeological parameters as proxies for failure, and produce spatially distributed VOIA maps. The method is demonstrated for a case study of a planned tunnel in Stockholm, Sweden, where additional investigations produce a low number of benefits as a result of low failure rates for the studied alternatives and a cause-effect chain where the resulting failure probability is more dependent on interactions within the whole system rather than on specific features.

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“…The inversion of the Wenner-Schlumberger dataset converged to a data misfit of 1.7%, which is the same as the noise added. The Wenner-Schlumberger array inverse model displays Stockholm Municipality 1997;Persson 1998;Persson, Sträng and Antal 2001). The soil layers covering the bedrock are expected to include till and various recent sediments (Morfeldt 1993).…”

Section: Synthetic Modellingmentioning

confidence: 99%

Underwater ERT surveying in water with resistivity layering with example of application to site investigation for a rock tunnel in central Stockholm

Dahlin

Loke²

2018

Near Surface Geophysics

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We present an approach to underwater electrical resistivity tomography surveying under conditions with several water layers with different resistivity in the water above the electrode layout. The approach is verified against a synthetic model example and tested in full scale on data from a field survey. The field survey was carried out in central Stockholm as part of pre‐investigations for a new metro train (T‐bana) tunnel planned to pass under seawater. The water passage is associated with major tectonic zones that can potentially be very difficult from a tunnel construction point of view. The aim was to identify variations in depth of the bottom sediments and variations in rock quality including the possible presence of weak zones in the rock. Survey conditions are complicated by boat traffic and electrical disturbances from the power grid and train traffic. The water depth was mapped using sonar combined with recording pressure transducers, and water resistivity as a function of water depth was recorded using geophysical borehole logging equipment. Water resistivity as a function of depth was integrated in the inversion model. The results show that the rather difficult survey conditions could be handled in a satisfactory way thanks to adequate equipment, careful planning, and attention to details. The measured data contain information that is relevant for creating coherent models of the variation in depth to rock, which corresponds well with data from drilling. The results also indicate that information in variation in rock quality that can be of critical importance for planning of underground construction can be derived from the data.

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Engineering geology of Stockholm, Sweden

Cited by 13 publications

References 6 publications

Comparison of the early stages of corrosion of copper and iron investigated by in situ TM-AFM

Comparison of the early stages of corrosion of copper and iron investigated by in situ TM-AFM

Economic valuation of hydrogeological information when managing groundwater drawdown

Underwater ERT surveying in water with resistivity layering with example of application to site investigation for a rock tunnel in central Stockholm

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