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Landscape scale regolith variation in hydraulic parameters and its effect on dryland salinity
Conference paper   Open access

Landscape scale regolith variation in hydraulic parameters and its effect on dryland salinity

C. Clarke, R. George, R. Bell, G. Mauger and R. Hobbs
Soils '97 : proceedings of the fourth triennial Western Australian Soil Science Conference (Geraldton, Western Australia, 30/09/1997–02/10/1997)
1997
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Abstract

This paper brings together the results of research into the impact that major faults have on dryland salinity, and the development of revegetation treatments in the wheatbelt of Western Australia. Currently landscape planning does not routinely take geology into account but this research shows that faults can have a dramatic impact on land and stream salinisation and on the effectiveness of revegetation treatments and there is evidence that other geological features can have a similar influence. This research shows that faults can be identified from airborne magnetic data and that they can be assigned a characteristic hydraulic conductivity based on simple borehole tests. There is evidence that the four other geological features which are expected to affect land and stream salinity can be identified from airborne geophysical data. A geological theme map could then be created to which characteristic hydraulic conductivities could be assigned. The resulting map could be used in any computer model of the shallow and deep groundwater systems to improve the prediction of the effectiveness of revegetation treatments and thus enhance the current landscape planning process.

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