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| Titel |
Interferometric phase analysis from clay areas for soil water storage change estimation |
| VerfasserIn |
Bram te Brake, Martine van der Ploeg, Gerrit de Rooij, Ramon Hanssen |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250056390
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| Zusammenfassung |
| The soil moisture status of the unsaturated zone is a key factor affecting hydrological fluxes.
Several methods to measure soil water content on different scales have been proposed. In-situ
methods are generally confined to very small spatial scales (~10-3 m3), while many larger
scale soil moisture products have resolutions exceeding the relevant scale for local scale
water management and policy making.
Active microwave sensors (like SAR) are a type of sensors to meet the required spatial
resolution (10-100 meter) for local scale water management. Active microwave soil moisture
estimates are however limited to the upper few centimeters of the soil. For many hydrological
studies the changes in total water present in the soil is needed. In soils with a large clay
content, water content variations result in volume changes which are observable as soil
surface elevation changes. These elevation changes may be used as an estimate of total soil
water storage change.
We investigate whether these subtle surface elevation changes are observable by
interferometric phase analysis of TerraSAR-X data. These data offer high resolution (3 meter)
and high frequency (11 days) observations. In-situ observations of soil moisture and surface
elevation changes are linked to phase observations. The results suggest that swell and
shrinkage of clays is observable by in the interferometric phase signal and could in the future
be used to estimate soil water storage changes for local water management purposes. |
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