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Runoff and erosion at the micro-plot and slope scale in a small burnt catchment...
Vieira, D.; Keizer, J.; Nunes, J.; Fernandes I.; Faria, S.; Ferreira, R.; Pedrosa, E.; Varela, M.; Gomes Pereira, L.Wildfires can have important impacts on hydrological processes and soil erosion in forest catchments, due to the destruction of vegetation cover and changes to soil properties. However, the processes involved are non-linear and not fully understood. This has severely limited the understanding on the impacts of wildfires, especially in the up-scaling from hillslopes to catchments; in consequence, current models ...
Importance of DTM accuracy, precision and acquisition technique for estimating ...
Cambra, S.; Pereira, L.; Keizer, J.Wildfires are a frequent phenomenon in Portugal, affecting over 300.000 ha in dry years like 2003 and 2005. Directly and/or indirectly, wildfires can strongly enhance the hydrological response and associated sediment losses and, thereby, negatively affect land-use sustainability as well as ecosystem functioning of downstream aquatic habitats. Therefore, the EROSFIRE projects aim at developing a GIS-tool for pre...
Escorrência e erosão a múltiplas escalas espaciais numa área florestal mista re...
Fernandes, I.; Nunes, J.; Ferreira, R.; Pereira, L. Gomes; Vieira, D.; Keizer, J.O presente artigo apresenta resultados preliminares da monitorização de escorrência e erosão do solo após incêndio, numa micro-bacia hidrográfica no centro de Portugal. Os dados recolhidos permitem avaliar os diferentes processos que governam a resposta hidrológica e a erosão a diferentes escalas espaciais, micro parcela (< 2 m2), encostas de vários comprimentos (40 a 90 m) e micro bacia (11×104 m2). ; Cet art...
Effect of the Resolution and Accuracy of DTM produced with Aerial Photogrammetr...
Cambra, S.; Gomes Pereira, L.; Keizer, J.Wildfires are a common phenomenon in Portugal, affecting on average 100.000 ha of rural areas per year and up to 400.000 ha in dramatic years like 2003 and 2005. Wildfires can strongly enhance the hydrological response and associated sediment losses in recently burnt forest catchments and, thereby, negatively affect land-use sustain- ability of the affected terrains as well as ecosystem functioning of downstrea...
Hydrological and erosion response at micro-plot to -catchment scale following f...
Vieira, D.; Keizer, J.; Nunes, J.; Fernandes, I.; Ferreira, R.; Gomes Pereira, L.; Prats, S.; Rial, M.; Varela, M.Wildfires can have important impacts on hydrological and soil erosion processes, due to the destruction of vegetation cover and changes to soil properties. According to Shakesby and Doerr (2006), these wildfire effects are: i) much better known at small spatial scales (especially erosion plots) than at the scale of catchments; ii) much better studied with respect to overland flow and streamflow (and, then, espe...
Runoff and erosion in a small burnt catchment in central Portugal
Vieira, D.; Keizer, J.; Nunes, J.; Fernandes, I.; Faria, S.; Ferreira, R.; Varela, M.; Gomes Pereira, L.Post-fire erosion is a major concern because of its potential effects on soil and water resources. Wildfire is frequently observed to increases soil erosion rates (Shakesby and Doerr, 2006). Many studies have emphasized the role of the partial or entire elimination of vegetation and ground cover (thereby exposing the mineral soil to direct impact of raindrops and overland flow) as a key factor in the increased ...
The study of soil, hydrological, erosion and vegetation processes following wil...
Keizer, J.; Nunes, J.; Sande Silva, J.; Gomes Pereira, L.; Vieira, D.; Varela, M.; Prats, S.; Pinheiro, J.; Pereira, V.; Mendes, H.; Malvar, M.The EROSFIRE-II project (PTDC/AGR-CFL/70968/2006) has as overall aim to predict soil erosion risk in recently burnt forest areas, including following common post-fire forest management practices. Although the project’s main focus is on onsite erosion processes, also the export of sediments out of small catchments is addressed. To this end, a study area of about 60 ha located near to the village of Colmeal (...
Runoff at the micro-plot and slope scale following wildfire, central Portugal
Vieira, D.; Keizer, J.; Nunes, J.; Fernandes, I.; Faria S.; Ferreira, R.; Pedrosa, E.; Varela, M.; Pereira, L.Through their effects on soil properties and vegetation/litter cover, wildfires can strongly enhance overland flow generation and accelerate soil erosion [1] and, thereby, negatively affect land-use sustainability as well as downstream aquatic and flood zones. Wildfires are a common phenomenon in present-day Portugal, devastating in an average year some 100.000 ha of forest and woodlands and in an exceptional y...
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