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|Title:||Electrical resistivity and spatial variation in agriculture terraces: statistical correlation between ert and flow direction algorithms|
|Abstract:||The construction of earthen embankmentterraces in the Douro Region raises a set of problemsrelated to hydrological processes. The main objectiveof this study is the evaluation of the spatial variationof electrical resistivity in agriculture terraces at Dourovalley (Portugal). To achieve this objective, two variablesare analysed, the soil electrical resistivity and the flowdirection algorithm. In a field survey we recorded 13electrical resistivity profiles. The contributing area wascalculated with the algorithms D¿ (Deterministic InfinityFlow) and MFD (Multiple Flow Direction) and the results arethe base of the internal runoff modelling, both supportedby the digital elevation model with a spatial resolutionof 1m2. A correlation between the spatial variation ofthe soil electrical resistivity represented by the standarddeviation of the electrical resistivity for each profile andthe average value of the contributing area coincident witheach profile was established. The electrical resistivitystandard deviation seems to be moderately well correlatedaccording to the D¿ algorithm at about 1m of depth, and ithas a good correlation at 1,5m to 2m of depth with the MFDalgorithm. Taken together, the results show a significantpositive statistical correlation between the electricalresistivity standard deviation and the contributing areas(MFD and D¿) depending on the soil depth.|
|Document Type:||Artigo em Revista Científica Internacional|
|Appears in Collections:||FCUP - Artigo em Revista Científica Internacional|
FLUP - Artigo em Revista Científica Internacional
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