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| Titel |
Effects of spatial variability of soil hydraulic properties on water dynamics |
| VerfasserIn |
Silvio José Gumiere, Jean Caron, Yann Périard, Jonathan Lafond |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077318
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| Zusammenfassung |
| Soil hydraulic properties may present spatial variability and dependence at the scale of
watersheds or fields even in man-made single soil structures, such as cranberry fields. The
saturated hydraulic conductivity (Ksat) and soil moisture curves were measured at two
depths for three cranberry fields (about 2 ha) at three different sites near Québec city, Canada.
Two of the three studied fields indicate strong spatial dependence for Ksat values and soil
moisture curves both in horizontal and vertical directions. In the summer of 2012, the three
fields were equipped with 55 tensiometers installed at a depth of 0.10 m in a regular grid.
About 20 mm of irrigation water were applied uniformly by aspersion to the fields, raising
soil water content to near saturation condition. Soil water tension was measured once every
hour during seven days. Geostatistical techniques such as co-kriging and cross-correlograms
estimations were used to investigate the spatial dependence between variables. The
results show that soil tension varied faster in high Ksat zones than in low Ksatones
in the cranberry fields. These results indicate that soil water dynamic is strongly
affected by the variability of saturated soil hydraulic conductivity, even in a supposed
homogenous anthropogenic soil. This information may have a strong impact in irrigation
management and subsurface drainage efficiency as well as other water conservation issues.
Future work will involve 3D numerical modeling of the field water dynamics with
HYDRUS software. The anticipated outcome will provide valuable information for the
understanding of the effect of spatial variability of soil hydraulic properties on soil
water dynamics and its relationship with crop production and water conservation. |
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