Detection of lineaments using airborne laser scanning technology: Laxemar-Simpevarp, Sweden

Nyborg, Mats R.; Berglund, Johan; Triumf, Carl-Axel

doi:10.1007/s10040-006-0134-0

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…The interpretation of the Christie Lake lineament as a fault associated with the OttawaBonnechere graben suggests that other northwest-trending lineaments may also be associated with faults. Northwest-trending lineaments were not observed in Landsat imagery, suggesting that digital elevation models (or other topographic remote imagery) may be more useful for identifying faults at a regional scale than tonal remote imagery, especially in topographically subdued terrain (Nyborg et al, 2007).…”

Section: Discussionmentioning

confidence: 62%

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Gleeson

Novakowski

2009

Geological Society of America Bulletin

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Lineament identifi cation is a standard but controversial hydrogeologic practice. In this study, we present a rigorous examination of the hydrology of lineaments in a crystalline bedrock setting. Lineaments are reinterpreted as watershed-scale hydraulic barriers, in contrast to previous interpretations as fractured conduits that focus recharge and fl ow. In the study area, an ~900 km 2 watershed underlain by the granitic and gneissic terrain of the Canadian Shield, bedrock lineaments are associated with linear lake shores and perennial wetland complexes. Lineaments were identifi ed using a robust multi-image method and characterized by remote sensing, fracture mapping, drilling, hydraulic characterization, and numerical simulation of a coupled groundwater-surface-water system. Results indicate that two principal lineament sets are oriented parallel to fracture and fault orientations, and thus lineaments are interpreted as structural features, either fault zones or fracture zones with limited displacement. Faulted lineaments are more effectively identifi ed by digital elevation model (DEM) topographic data rather than Landsat tonal imagery. Hydrogeological characterization and geomatic data indicate that the fractured bedrock underlying lineaments is composed of poorly connected zones of reduced permeability due to fault zone and/or fl uid fl ow processes. Field data and numerical simulations suggest that lineament areas are barriers to recharge and fl ow in this setting as a result of permeability reduction. Integrated data sets and models of lineament permeability that are geologically realistic result in a better understanding of fractured bedrock aquifers and patterns of fl uid fl ow in the brittle uppermost crust.

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Section: Discussionmentioning

confidence: 62%

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Gleeson

Novakowski

2009

Geological Society of America Bulletin

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“…In addition to geophysics, there is an extensive log of research that indicates how to discover and assess lineaments/heterogeneity throughout a region [ Brunner et al ., ; Koch and Mather , ; Nyborg et al ., ; Sander , ; Solomon and Quiel , ] however the integrated application with regional groundwater modeling is scarce in relation to the effects of dykes. Two studies that show regional modeling of dykes within groundwater flow models are Morel and Wikramaratna [] and Babiker and Gudmundsson [].…”

Section: Introductionmentioning

confidence: 99%

Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

Dickson

Comte

McKinley

et al. 2014

Water Resources Research

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In highly heterogeneous aquifer systems, conceptualization of regional groundwater flow models frequently results in the generalization or negligence of aquifer heterogeneities, both of which may result in erroneous model outputs. The calculation of equivalence related to hydrogeological parameters and applied to upscaling provides a means of accounting for measurement scale information but at regional scale. In this study, the Permo-Triassic Lagan Valley strategic aquifer in Northern Ireland is observed to be heterogeneous, if not discontinuous, due to subvertical trending low-permeability Tertiary dolerite dykes. Interpretation of ground and aerial magnetic surveys produces a deterministic solution to dyke locations. By measuring relative permeabilities of both the dykes and the sedimentary host rock, equivalent directional permeabilities, that determine anisotropy calculated as a function of dyke density, are obtained. This provides parameters for larger scale equivalent blocks, which can be directly imported to numerical groundwater flow models. Different conceptual models with different degrees of upscaling are numerically tested and results compared to regional flow observations. Simulation results show that the upscaled permeabilities from geophysical data allow one to properly account for the observed spatial variations of groundwater flow, without requiring artificial distribution of aquifer properties. It is also found that an intermediate degree of upscaling, between accounting for mapped field-scale dykes and accounting for one regional anisotropy value (maximum upscaling) provides results the closest to the observations at the regional scale.

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“…(2008) estimate changes on sand banks in the Wadden Sea by analysing extracted bank line ridges. Nyborg et al . (2007) use extracted structure lines as an indicator for structural geology to estimate the stability of the geologic situation for planning a nuclear waste repository in Sweden.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of automatically extracted geomorphological breaklines from airborne lidar curvature images

Rutzinger

Höfle

Kringer

2012

Geografiska Annaler: Series A, Physical Geography

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Rutzinger, M., Höfle, B. and Kringer, K., 2012. Accuracy of automatically extracted geomorphological breaklines from airborne LiDAR curvature images. Geografiska Annaler: Series A, Physical Geography, 94, 33–42. doi:10.1111/j.1468‐0459.2012.00453.x ABSTRACT Geomorphological breaklines are 3D polylines extracted from high‐resolution digital terrain models (DTMs), which have manifold applications in geomorphology and related fields. Breaklines are used to maintain and refine the characteristic information on discontinuities in the process of DTM filtering and interpolation. Knowledge about the quality of the derived breaklines is important in order to provide adequate input data for DTM generation, geomorphological feature mapping, and change detection analysis. The spatial accuracy and the classification accuracy of derived breaklines depend on data acquisition settings and processing steps. The critical criteria are the precision and density of the LiDAR point cloud, the resolution and quality of the filtered and interpolated DTM and the target scale breaklines are derived for. In this paper a quantitative method for assessing the quality of derived breaklines, which are extracted from regions with high curvature, is presented. Selected components of the breakline detection workflow are analysed. In addition, the reliability of manually digitized reference lines is investigated. Selected geometric properties such as line length, slope and sinuosity are computed and compared to reference data. The properties are discussed regarding their explanatory power with respect to accuracy and precision. Automatic extraction results strongly differ from manually digitized breaklines. Breaklines from manual digitalization are found to vary in coverage and spatial accuracy and thus reflect always the operator's ability, perception and intention. The advantage of automated extracted breaklines is their reproducibility and adaptability to scale.

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Detection of lineaments using airborne laser scanning technology: Laxemar-Simpevarp, Sweden

Cited by 10 publications

References 2 publications

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Identifying watershed-scale barriers to groundwater flow: Lineaments in the Canadian Shield

Coupling ground and airborne geophysical data with upscaling techniques for regional groundwater modeling of heterogeneous aquifers: Case study of a sedimentary aquifer intruded by volcanic dykes in Northern Ireland

Accuracy of automatically extracted geomorphological breaklines from airborne lidar curvature images

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