ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 6, pp. 7-16

Relation between available water content in soil and gravity force (from GRACE data)

A.V. Kiselev 1 , N.R. Muratova 2 , V.I. Gornyy 1 , A.A. Tronin 1 
1 Saint Petersburg Scientific-Research Centre for Ecological Safety RAS, Saint Petersburg, Russia
2 National Center of Space Research and Technologies, Almaty, Kazakhstan
An analysis of possibility to map available water content (AWC) of soil by using variations of gravity force was performed. AWCs of soils were measured at depths 0.0–0.2 m; 0.2–0.5 m; 0.5–1.0 m at Karabolyk, Zarechensk, Arkalyk, and Karasoo agricultural test sites of Republic of Kazakhstan. The correlations between AWC and thickness of effective water layer from GRACE data were investigated. The reliable statistic link between AWC and thickness of effective water layer was noticed for the soil layer at 0.5–1.0 m depth. Moreover, the reliable statistical link between thickness of effective water layer and snow cover thickness was obtained. The conclusion is that thickness of effective water layer, measured by GRACE together with ground level available water content measurements at test sites could be the basis for regional AWC monitoring. It was concluded that GRACE data can be quite promising for snow water supplies mapping inside big river basins.
Keywords: satellite, GRACE, gravity force, variations, soil, available water content, correlation
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