Abstract:The Urban Heat Island phenomenon and urban overheating are serious consequences of urbanization resulting in impacts on thermal comfort levels, heat stress and even mortality. This paper builds on previous findings on the topic of non-constructible parcels, small vacant or built spaces in Municipal Beirut, some of which belong to the municipality while others are privately owned and which might be used for different functional purposes. This paper further examines the possibility of implementing cool surface or paving materials and urban vegetation to reduce air urban temperature, especially during the summer period and with the view to project the positive findings of this case study to the entire Municipal Beirut area. A numerical analysis using ENVI-met 4.0 investigates the thermal performance of these non-constructibles further to implementation of high reflective surfaces and urban vegetation on a broad neighborhood scale, taking the Bachoura District as a reference case for a typical summer day. The best air temperature reductions correspond to the use of cool material in areas that are far from buildings where there are no shadow effects. In some cases, the introduction of trees leads to an increase of the air temperature near the ground because they became an obstacle of the natural ventilation. Results show a maximum mitigation effect with the use of cool materials that lead to reductions in air temperatures up to 0.42 • C if used alone and up to 0.77 • C if used in combination with trees. Within the framework of an integrated approach to planning, this form of urban intervention aims for substantial overheating reduction.

The 4 August 2020 Port of Beirut blast caused material damage to an estimated 77,000 apartments located across 10,000 buildings within a 3 km radius of the blast, impacting around 300,000, people predominantly in the municipality of Karantina, which is situated adjacent to the Port of Beirut. The blast shed light on the instability and unsustainable development approach of the city of Beirut since well before the French mandate circa 1921–1940. The impact of the blast provides an opportunity to reassess the relationship between many relevant aspects of the city planning including but not limited to: the relationship of the city to its suburbs, waterfront, and city center; the lack of local planning and cross sectorial master plans; the preservation of the heritage versus the complexity of its urban development; the city growth and increased haphazard urbanization; the infrastructure/service systems that have over the years become increasingly deficient; the lack of public spaces; impacts on urban climate; and the urban divide and inequality that have only grown deeper since the blast, all of which have a combined and adverse impact on the quality of city life. This paper analyzes the most suitable indicators that one must highlight within the context of Beirut city to propose a better and sustainable quality of life with a focus on areas that were significantly impacted by the recent POB blast, namely Karantina. Examples of indicators which were analyzed include sustainable urban design, open spaces, heritage, infrastructure, and urban fabric. The results indicated that the following four main urban design features help improve the quality of life in Karantina, including: (i) connecting areas of Karantina and Mar Mkhael through the reactivation of vacant lots; (ii) reactivation of Ibrahim Bacha and El-Khodr Streets; (iii) redefining the historical El Khodr Mosque boundary and reclaiming its role as an urban landmark; and (iv) integration of classified built heritage. These parameters are necessary to improve the quality of life. The benefits of community participation are also assessed in the improvement and sustainable planning of the city of Beirut.

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The Urban Heat Island (UHI) is one of the more serious consequences of urbanization resulting in impacts on thermal comfort levels, heat stress, and even mortality. For Municipal Beirut, implementation of “cool” surface materials and green spaces have been recommended to counterbalance the UHI. This paper builds on previous findings on the topic of non-constructible parcels within the district of Bachoura in Municipal Beirut and examines the possibility of implementing “cool” surface or paving materials and urban vegetation which can improve thermal conditions especially during the summer period and with the viewto project the positive findings of this case study to the entire Municipal Beirut area. A numerical analysis using ENVI-met 4.0 investigates the thermal performance of these non-constructibles further to implementation of high reflective surfaces and urban vegetation within a broad neighborhood scale in Bachoura. Results show reductions in ambient temperatures up to 1K on a summer day.. Within the framework of an integrated approach to planning, this form of urban acupuncture aims for substantial UHI reduction. Energy performance of buildings further to implementation of these mitigation measures is also recommended for future studies and to validate the findings in this paper.

This article discusses planning within Municipal Beirut, Lebanon, while focusing on the specific context of divided cities and societies, proposing a series of recommendations based on socio-economic and political science and planning theory to understand such contexts. It explores the case of Municipal Beirut that has undergone a devastating blast on August 4th, 2020, and left thousands of households in critical condition by leaving an already shattered sectarian city/society with an unforeseen planning future. By examining successful examples or frameworks in other cities and similar-context cities in history with urban/social shocks, evaluating current planning initiatives, and analyzing the case study of the recent Beirut Urban Declaration report, this article investigates neighborhood planning as a flexible framework that one must undertake to provide the divided city of Beirut a healthy and sustainable development. It argues that difference and diversity are a noteworthy feature of the city of Beirut and its society and should hence be incorporated in any planning approach even if the consequences on the ground may differ. Considering that planning could change the spatial, socio-economic, and political dimensions of a defined urban space, this article explores which of these dimensions can be used to intensify or lessen contestations over space in Beirut under the current sectarian culture reflected in both social and spatial realms. In the wake of the blast and amid all these divisions, this article will show that neighborhood planning stands out as a flexible and sustainable solution. By establishing a spatially targeted program, introducing innovative tools for neighborhood planning and management, and initiating a small-scale governance structure, neighborhood planning will create an intermediate level between the municipality, citizens, and other local actors, enhancing its social capital and leading eventually to an undivided planning strategy at a national and city scale.