Loading...
Publication
Análise de métodos de classificação automática de uso do solo associadas à caracterização e quantificação de áreas regadas - Caso de estudo Campina de Faro, Algarve
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 16.11 MB | Adobe PDF |
Authors
Abstract(s)
A região Algarvia, com um clima temperado de características mediterrânicas, enfrenta uma crescente incidência de fenómenos de seca hidrológica prolongada, o que agrava de forma significativa os desafios relacionados com a escassez de recursos hídricos na região. A estimativa de valores do consumo de água subterrânea em áreas de regadio na região Algarvia consiste numa variável difícil de controlar e quantificar, não só devido ao elevado número de captações particulares, mas também por causa da variação meteorológica, que afeta os regimes de rega e das áreas regadas. Através da informação extraída pelo processamento de imagens digitais obtidas por deteção remota, juntamente com os valores das dotações de rega, pretende-se contribuir para estimativas do balanço hídrico do sistema aquífero de Campina de Faro mais precisas. Neste trabalho, estudou-se a classificação de uso e ocupação do solo para desenvolver uma metodologia de classificação automática de áreas agrícolas e espaços verdes regados, usando imagens de satélite Sentinel-2, aplicados à Campina de Faro. O projeto permitiu caracterizar com precisão as principais culturas agrícolas e espaços verdes regados na área de estudo e estimar o volume de água utilizado na rega com base nas dotações de rega das diferentes culturas. A metodologia desenvolvida é facilmente replicável para diferentes períodos e zonas, oferecendo uma ferramenta útil para a gestão dos recursos hídricos na região do Algarve. Os resultados obtidos permitiram a classificação das principais áreas e culturas regadas no sistema aquífero, bem como a quantificação da sua variação ao longo do tempo. Para além disso, foram aplicadas dotações de rega oficiais da DGADR, com o objetivo de estimar o volume de água utilizado na rega destas parcelas agrícolas, de forma a quantificar o volume de água extraído do aquífero para a agricultura e golfe. Os valores obtidos estão próximos dos valores oficiais reportados nos Planos de Gestão da Região Hidrográfica, o que demonstra, de certa forma, a fiabilidade dos resultados alcançados com esta metodologia.
The Algarve region, with its temperate climate and Mediterranean characteristics, faces a growing incidence of prolonged hydrological droughts, which significantly exacerbates the challenges related to water scarcity in the region. Estimating groundwater consumption values in irrigated areas in the Algarve region is a difficult variable to control and quantify, not only due to the high number of private water intakes, but also because of meteorological variations, which affect irrigation regimes and irrigated areas. The main goal of the present work intends to contribute for more precise estimates of groundwater use at the Campina de Faro aquifer case study (South Portugal) through the use of remote sensing images and their digital processing together with the use of typical irrigation allocation values. In this work, the classification of land use and occupation was studied to develop a methodology for the automatic classification of agricultural areas and irrigated green spaces, using Sentinel-2 satellite images, applied to Campina de Faro. The project made it possible to accurately characterize the main agricultural crops and irrigated green spaces in the study area and to estimate the volume of water used for irrigation based on the irrigation allocations of the different crops. The methodology developed is easily replicable for different periods and areas, offering a useful tool for water resource management in the Algarve region. The results obtained allowed the classification of the main areas and crops irrigated in the aquifer system, as well as the quantification of their variation over time. In addition, official irrigation allocations from the DGADR were applied, with the aim of estimating the volume of water used to irrigate these agricultural plots, in order to quantify the volume of water extracted from the aquifer for agriculture and golf. The values obtained are similar to the official values reported in the River Basin Management Plans, which demonstrates, to a certain extent, the reliability of the results achieved with this methodology.
The Algarve region, with its temperate climate and Mediterranean characteristics, faces a growing incidence of prolonged hydrological droughts, which significantly exacerbates the challenges related to water scarcity in the region. Estimating groundwater consumption values in irrigated areas in the Algarve region is a difficult variable to control and quantify, not only due to the high number of private water intakes, but also because of meteorological variations, which affect irrigation regimes and irrigated areas. The main goal of the present work intends to contribute for more precise estimates of groundwater use at the Campina de Faro aquifer case study (South Portugal) through the use of remote sensing images and their digital processing together with the use of typical irrigation allocation values. In this work, the classification of land use and occupation was studied to develop a methodology for the automatic classification of agricultural areas and irrigated green spaces, using Sentinel-2 satellite images, applied to Campina de Faro. The project made it possible to accurately characterize the main agricultural crops and irrigated green spaces in the study area and to estimate the volume of water used for irrigation based on the irrigation allocations of the different crops. The methodology developed is easily replicable for different periods and areas, offering a useful tool for water resource management in the Algarve region. The results obtained allowed the classification of the main areas and crops irrigated in the aquifer system, as well as the quantification of their variation over time. In addition, official irrigation allocations from the DGADR were applied, with the aim of estimating the volume of water used to irrigate these agricultural plots, in order to quantify the volume of water extracted from the aquifer for agriculture and golf. The values obtained are similar to the official values reported in the River Basin Management Plans, which demonstrates, to a certain extent, the reliability of the results achieved with this methodology.
Description
Keywords
Escassez hídrica Classificação automática Automatização Quantificação do volume de rega Aquífero Campina de Faro