Publicação
Environmental and landscape rehabilitation plans : the case of Foz de Tua dam
| Resumo: | The construction of Foz de Tua dam caused a severe environmental change at local level, producing a considerable visual impact that must be remedied and the disturbed area must be rehabilitated and recovered, approaching to the previous landscape before the dam construction. The affected area is close to the Alto Douro Vinhateiro World Heritage, what means special care is needed, considering at same time the humanized landscape and also the natural characteristics present in the area, namely for the vegetation. With this work, several interventions were proposed, aiming to reduce the visual impact caused namely by slope excavation, but also by vegetation removing, needed for the Foz Tua dam construction. For vegetation recovery, natural vegetation was identified and a recovery plan were developed, aiming to reproduce the previous landscape configuration by planting and seedling, considering both natural vegetation and cultivated areas structures. For exposed rocks we started some assays with the purpose of find a treatment for fresh cutted granite that could be used as a general rock treatment for visual impact of fresh excavated rocks. Some organic mixtures were tried, using also autochthonous lichens and moss, as well as chemical treatments, like acid or paint. Granite blocks were selected and five different treatments were applied to cover the fresh granitic blocks and trigger their colonization and aging. The experiment has been established on two groups of blocks, one submitted to irrigation three times a week and the other group does not. Each treatment had two repetitions per group. Two blocks for control were also established in each group to interpret the gaps of variation in comparison to the treated blocks. All the stone blocks were maintained in a greenhouse, with controlled temperature and humidity. The monitoring of the treatment was by taking pictures every 20 days, that were analyzed using RGB color characteristics and parameters that shows the evolution of pigmentation of the blocks. The results of this study show that three or at least two from the five experimented treatments are recommended to use in the disturbed area. The irrigation can be recommended also for the two to three first weeks after treatments establishment. |
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| Autores principais: | Icil, Soukayna |
| Assunto: | Visual impact Quarrying Granite treatment Rock colonization Change in color |
| Ano: | 2017 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | português |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | The construction of Foz de Tua dam caused a severe environmental change at local level, producing a considerable visual impact that must be remedied and the disturbed area must be rehabilitated and recovered, approaching to the previous landscape before the dam construction. The affected area is close to the Alto Douro Vinhateiro World Heritage, what means special care is needed, considering at same time the humanized landscape and also the natural characteristics present in the area, namely for the vegetation. With this work, several interventions were proposed, aiming to reduce the visual impact caused namely by slope excavation, but also by vegetation removing, needed for the Foz Tua dam construction. For vegetation recovery, natural vegetation was identified and a recovery plan were developed, aiming to reproduce the previous landscape configuration by planting and seedling, considering both natural vegetation and cultivated areas structures. For exposed rocks we started some assays with the purpose of find a treatment for fresh cutted granite that could be used as a general rock treatment for visual impact of fresh excavated rocks. Some organic mixtures were tried, using also autochthonous lichens and moss, as well as chemical treatments, like acid or paint. Granite blocks were selected and five different treatments were applied to cover the fresh granitic blocks and trigger their colonization and aging. The experiment has been established on two groups of blocks, one submitted to irrigation three times a week and the other group does not. Each treatment had two repetitions per group. Two blocks for control were also established in each group to interpret the gaps of variation in comparison to the treated blocks. All the stone blocks were maintained in a greenhouse, with controlled temperature and humidity. The monitoring of the treatment was by taking pictures every 20 days, that were analyzed using RGB color characteristics and parameters that shows the evolution of pigmentation of the blocks. The results of this study show that three or at least two from the five experimented treatments are recommended to use in the disturbed area. The irrigation can be recommended also for the two to three first weeks after treatments establishment. |
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