Comparative non-linear regression - case of infiltration rate increase from upstream in valley

• Autorzy: Keita A. , Yacouba H. , Hayde L. G. , Schultz B.
• Języki publikacji: EN

Abstrakty

EN

In Tropical Savannah flooded valley soils, very low infiltration rates often result in acidic conditions favourable to high concentrations of metallic ions, toxic for rice. Determination of the under-phreatic infiltration rate is important in drainage design to reclaim degraded soils. Several studies have addressed the mapping of the infiltration rate. Yet, its relationship with the toposequence of the valley is not clarified. This paper has investi- gated such a possibility, examining the case of the irrigated rice valley of Tiefora, Burkina Faso. Nine boreholes – from 1 to 5 m deep – were implemented from upstream to downstream. The Lefranc permeability test of the under-phreatic level in water- logged soils – used when the impervious layer is close to soil sur- face or absent – was conducted. First, a comparative regression was applied to the data, including all the parameters of the regression curves. In the case of dissimilarity of the infiltration processes, the comparison focused on the final permeability. The results show a permeability increase from upstream (0.10±0.10 cm h -1 ) to down- stream (greater than 20±10 cm h -1 in some places). Taking into account such a permeability increase in the subsurface drainage system design would result in implementation of more efficient and cost effective systems.

Słowa kluczowe

EN

drainage; nonlinear regression; infiltration rate; permeability; savannah; flooded valley; soil

• Wydawca: -
• Czasopismo: International Agrophysics
• Rocznik: 2014
• Tom: 28
• Numer: 3
• Opis fizyczny: p.303-310,fig.,ref.

Twórcy

autor

Keita A.

• Department of Hydraulics, International Institute for Water and Environmental Engineering (2iE), Ouagadougou, 01 BP 594 Ouaga 01, Burkina Faso

autor

Yacouba H.

• Department of Hydraulics, International Institute for Water and Environmental Engineering (2iE), Ouagadougou, 01 BP 594 Ouaga 01, Burkina Faso

autor

Hayde L. G.

• Department of Water Science and Engineering, International Institute for Hydraulic and Environmental Engineering (UNESCO-IHE- Institute for Water Education), Delft, PO Box 3015, 2601 DA Delft, The Netherlands

autor

Schultz B.

• Department of Water Science and Engineering, International Institute for Hydraulic and Environmental Engineering (UNESCO-IHE- Institute for Water Education), Delft, PO Box 3015, 2601 DA Delft, The Netherlands

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