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    Geological Effects on Lightning Strike Distributions

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    Name:
    J. Scott Berdahl - Thesis - Final ...
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    11.21Mb
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    Type
    Thesis
    Authors
    Berdahl, J. Scott cc
    Advisors
    Jonsson, Sigurjon cc
    Committee members
    Genton, Marc G. cc
    Bagci, Hakan cc
    McCabe, Matthew cc
    Program
    Earth Sciences and Engineering
    KAUST Department
    Physical Sciences and Engineering (PSE) Division
    Earth Science and Engineering Program
    Date
    2016-05-16
    Permanent link to this record
    http://hdl.handle.net/10754/610555
    
    Metadata
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    Abstract
    Recent advances in lightning detection networks allow for detailed mapping of lightning flash locations. Longstanding rumors of geological influence on cloud-to-ground (CG) lightning distribution and recent commercial claims based on such influence can now be tested empirically. If present, such influence could represent a new, cheap and efficient geophysical tool with applications in mineral, hydrothermal and oil exploration, regional geological mapping, and infrastructure planning. This project applies statistical analysis to lightning data collected by the United States National Lightning Detection Network from 2006 through 2015 in order to assess whether the huge range in electrical conductivities of geological materials plays a role in the spatial distribution of CG lightning. CG flash densities are mapped for twelve areas in the contiguous United States and compared to elevation and geology, as well as to the locations of faults, railroads and tall towers including wind turbines. Overall spatial randomness is assessed, along with spatial correlation of attributes. Negative and positive polarity lightning are considered separately and together. Topography and tower locations show a strong influence on CG distribution patterns. Geology, faults and railroads do not. This suggests that ground conductivity is not an important factor in determining lightning strike location on scales larger than current flash location accuracies, which are generally several hundred meters. Once a lightning channel is established, however, ground properties at the contact point may play a role in determining properties of the subsequent stroke.
    DOI
    10.25781/KAUST-95DAM
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-95DAM
    Scopus Count
    Collections
    Theses; Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program

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