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Modelação Geológica 3D e caracterização química dos materiais do Aterro da Boavista Poente na zona Ribeirinha de Lisboa
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Resumo(s)
O presente estudo contempla a caraterização geológica da zona poente do antigo Aterro da Boavista
em Lisboa no âmbito do Plano de Pormenor do Aterro da Boavista Poente (PPABP), que tem por
objetivo a reconversão urbanística e ambiental de uma área da cidade atualmente desarticulada e
parcialmente ocupada por edifícios industriais degradados, obsoletos e devolutos.
O objetivo principal do trabalho é a modelação geológica em três dimensões dos terrenos na zona do
aterro da Boavista Poente, localizado na zona Ribeirinha de Lisboa com vista a contribuir para o
conhecimento da geometria do aterro e das camadas subjacentes a este (aluviões e calcários do
Miocénico) incluindo a modelação e estimativa do volume de materiais com base nos teores de
chumbo observados.
Adicionalmente pretendeu-se estudar a correlação, se existente entre os teores de metais observados na
camada do aterro e a tipologia dos materiais seus constituintes.
A modelação geológica 3D foi realizada com recurso ao software de modelação 3D Leapfrog e teve
por base dados de sondagens realizadas no âmbito de estudos geotécnicos e ambientais do PPABP.
Os trabalhos contemplaram a determinação pelo método de Fluorescência de Raio X das
concentrações de metais no aterro e na aluvião, bem como a caracterização macroscópica da tipologia
dos materiais do aterro amostrado. Verificou-se que o aterro é constituído por materiais de diversas
tipologias, incluindo cinzas e escórias, fragmentos de alvenaria e de tijolo misturados com solo areno
argiloso e de aluvião, madeiras e outros.
Com base em modelos matemáticos de geoestatística, foi possível o mapeamento das áreas e volumes
de materiais no aterro com probabilidade de excedência das concentrações dos metais e metalóides em
relação a Valores de Referência (VR) predefinidos.
The present study contemplates the geological characterization of the western zone of the Boavista landfill in Lisbon in the scope of the Detailed Plan of the Boavista Poente landfill (PPABP), which aims at the urban and environmental reconversion of an area currently disjointed and partially occupied by derelict, obsolete and vacant industrial buildings. The aim of the study is the geological modelling in three dimensions of the Boavista landfill terrains, located in the Riverside area of Lisbon, with a purpose of contributing to the knowledge of the landfill geometry and its underlying layers (alluvium and Miocene ́s limestone) as well as an estimate of the volume of landfill materials categorized by typology, based on the observed lead concentration. The 3D geological modelling was executed using the 3D modelling software Leapfrog and was based on data from boreholes executed within the scope of geotechnical studies and the PPAB. Additionally, it intended to study the correlation, if any, between the metal contents observed in the landfill layer and the typology of its constituent materials. The works contemplated the determination of the concentrations of several metals by the X-Ray Fluorescence method as well as the macroscopic characterization of the typology of the sampled materials. The results show that the landfill consists of materials of different types, including ashes and slag, fragments of masonry and brick mixed with sandy clayey and alluvial soil, wood, and other inert materials. Based on geostatistical mathematical models, the mapping of metals and metalloids that exceeded the respective Reference Values (VRs) was executed and the volume of landfill materials with lead concentrations above the respective VR was estimated.
The present study contemplates the geological characterization of the western zone of the Boavista landfill in Lisbon in the scope of the Detailed Plan of the Boavista Poente landfill (PPABP), which aims at the urban and environmental reconversion of an area currently disjointed and partially occupied by derelict, obsolete and vacant industrial buildings. The aim of the study is the geological modelling in three dimensions of the Boavista landfill terrains, located in the Riverside area of Lisbon, with a purpose of contributing to the knowledge of the landfill geometry and its underlying layers (alluvium and Miocene ́s limestone) as well as an estimate of the volume of landfill materials categorized by typology, based on the observed lead concentration. The 3D geological modelling was executed using the 3D modelling software Leapfrog and was based on data from boreholes executed within the scope of geotechnical studies and the PPAB. Additionally, it intended to study the correlation, if any, between the metal contents observed in the landfill layer and the typology of its constituent materials. The works contemplated the determination of the concentrations of several metals by the X-Ray Fluorescence method as well as the macroscopic characterization of the typology of the sampled materials. The results show that the landfill consists of materials of different types, including ashes and slag, fragments of masonry and brick mixed with sandy clayey and alluvial soil, wood, and other inert materials. Based on geostatistical mathematical models, the mapping of metals and metalloids that exceeded the respective Reference Values (VRs) was executed and the volume of landfill materials with lead concentrations above the respective VR was estimated.
Descrição
Palavras-chave
Leapfrog contaminação por inorgânicos geoestatística modelação geológica 3D Aterro da Boavista Poente