Urban sprawl in Portugal based on urban systems spatial boundaries

Deus, Raquel de; Tenedório, José António; Bergadà, Montserrat Moix

doi:10.5821/ace.v7i20.2576

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…In terms of future LULC change dynamics, our analysis also indicates that we can expect land-use planning policies to have a great effect on future LULC change-particularly on changes to the vertical urban fabric, discontinuous urban fabric, and other artificial surfaces-especially towards the densification of existing urban areas, which is overtly in line with the compact city paradigm, which has been a key concern for Portuguese spatial planning in recent decades [25,34] and worldwide ( [49,50], among others). However, are there other ongoing urbanization processes in the study area due to political choices or other different socioeconomic and historical reasons?…”

Section: Discussionmentioning

confidence: 71%

“…In the last few decades, secondary residences were a substantial part of the conventional dwellings in Portimão: secondary residences accounted for 39.3%, 41.4%, 36.1%, and 31.8% of the total dwellings in 2021, 2011, 2001, and 1991, respectively. This research considers the municipality of Portimão since its territory is representative of the Portuguese urban environment, namely in terms of changes in LULC, urban polarization, coastal urbanization, and urban sprawl [34]. Administratively, the municipality of Portimão comprises three parishes: Portimão, Alvor, and Mexilhoeira Grande.…”

Section: Study Areamentioning

confidence: 99%

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100 Years of Land-Use and Land-Cover Data: What Has Been the Effect of Spatial Planning in Coastal Land-Use and Land-Cover Change?

et al. 2023

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The Sustainable Development Goals require us to rethink spatial planning policies’ effectiveness. This article proposes a reproducible method for assessing the effect of past planning practices and simulating future land-use and land-cover (LULC) changes with a Cellular Automata model. The originality of our approach is to systematically compare observed changes in LULC with the planning rules in force over almost a century of evolution. A quasi-exhaustive database was constructed at a very fine spatial resolution for the municipality of Portimão (Southern Portugal), including the location and changes of LULC categories, and the planning rules of the corresponding time period on nine dates between 1947 and 2018. The quantified measurement of the actual effect of planning rules enables us to identify other determinants of the evolution. Findings reveal that the policies established by the local government—which aimed to foster well-planned comprehensive urban areas—were not as effective as intended. The quantified discrepancies between planning recommendations and observed evolution help to simulate which LULC scenarios could be designed to reach the expected result in future planning policies. Our assessment method could be applied in other urban and tourist regions where land artificialization exerts strong pressure on the environment.

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Section: Discussionmentioning

confidence: 71%

Section: Study Areamentioning

confidence: 99%

100 Years of Land-Use and Land-Cover Data: What Has Been the Effect of Spatial Planning in Coastal Land-Use and Land-Cover Change?

et al. 2023

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Assessing Sustainable Urban Development Trends in a Dynamic Tourist Coastal Area Using 3D Spatial Indicators

et al. 2021

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In coastal areas, the tourism sector contributes to the local economy, generating income, employment, investments and tax revenues but the rapid urban expansion creates great pressure on local resources and infrastructures, with negative repercussions on the residents’ quality of life, but also compromising the visitor’s experience. These areas face problems such as the formation of meteorological effects known as heat islands, due to the soil sealing, and increased energy demand in the peak season. To evaluate the impact of urban growth spatial pattern and change, three strategic sustainable challenges—urban form, urban energy, and urban outdoor comfort—were selected. The progress towards sustainability was measured and analyzed in a tourist city in the Algarve region, Portugal, for the period 2007–2018, using geographic information. A set of 2D and 3D indicators was derived for the building and block scales. Then, a change assessment based on cluster analysis was performed, and three different trends of sustainable development were identified and mapped. Results allow detecting the urban growth patterns that lead to more sustainable urban areas. The study revealed that a high sustainable development was observed in 12% of the changed blocks in the study area. All indicators suggest that the growth pattern of the coastal area is in line with the studied sustainability dimensions. However, most of the blocks that changed between 2007 and 2018 (82%) followed a low sustainable development. These blocks had the lowest variation in the built volume and density, and consequently the lowest variations in the roof areas with good solar exposition. The urban development also privileged more detached and less compact buildings. This analysis will support the integration of 2D and 3D information into the planning process, assisting smart cities to comply with the sustainable development goals.

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Coastal Land-Use and Land-Cover Change Trajectories: Are They Sustainable?

Deus

Tenedório

2021

Sustainability

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In this study, past and current land-use and land-cover (LULC) change trajectories between 1947 and 2018 were analysed in terms of sustainability using a unique set of nine detailed, high-precision LULC thematic maps for the municipality of Portimão (Algarve region), Portugal. Several Geographic Information System (GIS)-based spatial analysis techniques were used to process LULC data and assess the spatiotemporal dynamics of LULC change processes. The dynamics of LULC change were explored by analysing LULC change trajectories. In addition, spatial pattern metrics were introduced to further investigate and quantify the spatial patterns of such LULC change trajectories. The findings show that Portimão has been experiencing complex LULC changes. Nearly 52% of the study area has undergone an LULC change at least once during the 71-year period. The analysis of spatial pattern metrics on LULC change trajectories confirmed the emergence of more complex, dispersed, and fragmented shapes when patches of land were converted from non-built categories into artificial surface categories from 1947 to 2018. The combined analysis of long-term LULC sequences by means of LULC change trajectories and spatial pattern metrics provided useful, actionable, and robust empirical information that can support sustainable spatial planning and smart growth, which is much needed since the results of this study have shown that the pattern of LULC change trajectories in Portimão municipality has been heading towards unsustainability.

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Urban sprawl in Portugal based on urban systems spatial boundaries

Cited by 3 publications

References 7 publications

100 Years of Land-Use and Land-Cover Data: What Has Been the Effect of Spatial Planning in Coastal Land-Use and Land-Cover Change?

100 Years of Land-Use and Land-Cover Data: What Has Been the Effect of Spatial Planning in Coastal Land-Use and Land-Cover Change?

Assessing Sustainable Urban Development Trends in a Dynamic Tourist Coastal Area Using 3D Spatial Indicators

Coastal Land-Use and Land-Cover Change Trajectories: Are They Sustainable?

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