Interface Zones: Assessing Porosity for an Integrated Urban Blue Spaces in Davao City&rsquo;s Seafront

Myrafe  S. Ylagan,; Isidoro  R. Malaque Iii,

Interface Zones: Assessing Porosity for an Integrated Urban Blue Spaces in Davao City’s Seafront

Myrafe S. Ylagan | Isidoro R. Malaque Iii

Discipline: others in geographical studies

Abstract:

The complexity of interface zones—determined by level of access to water and edge porosity—defines the extent of urban land-water integration. This study investigates the spatial and functional connection between urban land and water in public open spaces of Davao City, Philippines. Specifically, it explored the features of urban blue spaces across designated-use (9 stations), formal-use (4 stations), and informal-use (14 stations) typologies in the downtown Davao City seafront. A descriptive-exploratory approach integrating the spatial analysis with qualitative fieldwork was utilized to map the water's edge profile and quantitatively assess porosity levels by developing an index using factors such as land-water connection (C), land-water edge section (E), urban blue space use (U), and urban blue space edge (BSE). Findings revealed high porosity scores throughout most urban blue space sections, driven by complex water edges, direct waterline connections, and permeable designs that facilitate land-water connectivity and human interactions. The analysis revealed critical insights into urban blue space dynamics across edge types, using edge porosity and water accessibility as primary measures of landwater relationships. Important physical features that contribute to high porosity were identified, emphasizing the role of unrestricted access to water. These features vary by spatial typology and involve trade-offs among water edge design, functionality, and regulatory control. While enhancing land-water connectivity, these attributes present management challenges inherent to waterfront public open spaces. The findings underscore the necessity of context-sensitive planning approaches that balance porosity, security, equity, and ecology to enhance recreational, aesthetic, and resilient waterfronts, aligning with studies on blue-green integration.

References:

Al Ansari, F. (2009). Public open space on the transfroming urban waterfronts of Bahrain: The case of Manama City (Master’s thesis, Newcastle University). Newcastle University. http://theses.ncl.ac.uk/jspui/handle/10443/522
Atilano-Tang, L.A. (2023). Disaster risk management: Vulnerability and resilience in the coastal barangays of Zamboanga City. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.4505919
Avni, N., & Teschner, N. (2019). Urban waterfronts: Contemporary streams of planning conflicts. Journal of Planning Literature, 34(4), 408. https://doi.org/10.1177/0885412219850891 Benabbou, R., Hui, Y., Roberts, E., & Shao, J.J. (2022). Reinventing the image of cities using the element of water: International case studies of waterfront urban developments. WIT Transactions on Ecology and the Environment, 1, 365. https://doi.org/10.2495/sc220301
Breś, J., & Krośnicka, K. (2021). Evolution of edges and porosity of urban blue spaces: A case study of Gdańsk. Urban Planning (ISSN: 2183–7635), 6(3), 90–104. https://doi.org/10.17645/up.v6i3.4108
Brown, K., & Mijic, D.A. (2019). Integrating green and blue spaces into our cities: Making it happen. Grantham Institute Briefing Paper No. 30, Imperial College London. https://tinyurl.com/mmv5dvje
City Government of Davao and Its Constituents. (2006). The Davao City coastal zone management situation and recommendations. Davao City: City Government of Davao. Dubinina, A., Wawrzyńska, A., & Krośnicka, K. (2022). Permeability of waterfronts—Contemporary approach in designing urban blue spaces. Sustainability, 14(15), 9357. https://doi.org/10.3390/su14159357
Mishra, H., Bell, J.S., Balicka, J., & Wilczynńska, A. (2021). Reviewing the evidence for good planning and design. In Routledge eBooks (p. 231). Informa. https://doi.org/10.4324/9780429056161-14
Ogie, R., Dunn, S., Holderness, T., & Turpin, E. (2017). Assessing the vulnerability of pumping stations to trash blockage in coastal mega-cities of developing nations. Sustainable Cities and Society, 28, 53–66. https://doi.org/10.1016/j.scs.2016.08.022
Smith, N., Georgiou, M., King, A., Tieges, Z., Webb, S., & Chastin, S. (2021). Urban blue spaces and human health: A systematic review and meta-analysis of quantitative studies. [Review of Urban blue spaces and human health: A systematic review and meta-analysis of quantitative studies]. Cities, 119, 103413. Elsevier BV. https://doi.org/10.1016/j.cities.2021.103413
Taufen, A., & Yocom, K. (2021). Transitions in urban waterfronts: Imagining, contesting, and sustaining the aquatic/terrestrial interface. Sustainability, 13(1), 366. https://doi.org/10.3390/su13010366
Toomey, A., Palta, M., Johnson, M., Smith, J., Balladares, E., Auyeung, N., Svendsen, E., Pirani, R., Cullman, G., Corrado, J., & Campbell, L. (2023). Blue spaces as social spaces: Measuring the uses and values of urban waterfronts. Journal of Catholic Education, 16(2). https://doi.org/10.15365/cate.2023.160209
Wilczyńska, A., Niin, G., Vassiljev, P., Myszka, I., & Bell, S. (2023). Perceptions and patterns of use of blue spaces in selected European cities: Tartu, Tallinn, Barcelona, Warsaw, and Plymouth. Sustainability, 15(9), 7392. https://doi.org/10.3390/su15097392
Yin, Y., Shao, Y., Lu, H., & Han, Y. (2022). Environmental drivers of the vital urban coastal zones: An explorative case study based on the data-driven multi-method approach. Frontiers in Ecology and Evolution, 10. https://doi.org/10.3389/fevo.2022.962299