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Zhou, K.; Hawken, S. State of Knowledge Concerning Wastewater Treatment System Landscapes. Encyclopedia. Available online: https://encyclopedia.pub/entry/45695 (accessed on 20 December 2024).
Zhou K, Hawken S. State of Knowledge Concerning Wastewater Treatment System Landscapes. Encyclopedia. Available at: https://encyclopedia.pub/entry/45695. Accessed December 20, 2024.
Zhou, Kaihang, Scott Hawken. "State of Knowledge Concerning Wastewater Treatment System Landscapes" Encyclopedia, https://encyclopedia.pub/entry/45695 (accessed December 20, 2024).
Zhou, K., & Hawken, S. (2023, June 16). State of Knowledge Concerning Wastewater Treatment System Landscapes. In Encyclopedia. https://encyclopedia.pub/entry/45695
Zhou, Kaihang and Scott Hawken. "State of Knowledge Concerning Wastewater Treatment System Landscapes." Encyclopedia. Web. 16 June, 2023.
State of Knowledge Concerning Wastewater Treatment System Landscapes
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This entry is adapted from the peer-reviewed paper 10.3390/su15118977

Around the world, human populations and their supporting infrastructures are concentrated in coastal areas. With rising sea levels, these settlements and urban infrastructures are at risk of service interruptions, lasting damage and frequent climate-related hazards. Wastewater systems are especially vulnerable due to their proximity to coastlines. Despite the seriousness of sea-level-rise-induced challenges, a clear understanding of the risks and potential adaptations of coastal wastewater treatment systems and their associated landscapes in Australia has been overlooked. 

sea level rise climate change adaptation coastal infrastructure green infrastructure wastewater treatment landscape design

1. Introduction

Sea level rise has occurred throughout the 20th and 21st centuries and will continue to rise due to climate change [1]. The magnitude of future sea level rise is uncertain and depends on differing climate adaptation pathways. However, researchers do know that the level of rise will be substantial [1]. By 2100, global sea levels could rise by more than one meter when the loss of glaciers is considered [2][3]. In some cases, sea level rise could be even more extreme [4]. In Australia, sea levels have risen at an average rate of 1.6 mm annually over the past four decades, and it is projected to be 0.52–0.98 m by 2100 for the highest greenhouse gas emissions scenario [5]. According to the IPCC’s sixth report, the average rate of sea level rise increased about three times between 2006 and 2018 [3].
Worldwide, there are 680 million people living in low-lying coastal zones that are threatened by rising sea levels. With current urbanization trends, three times this population is expected to live and be located in coastal areas by 2050. In total, 50% of the world’s population will be within 100 km of coastal areas. As a coastal country, Australia conforms to these trends, with more than 50% of its population living within 7 km of the coast [6]. In the next forty years, another 6.8 million people are expected to inhabit coastal areas due to migration and population growth [7]. Within this group, approximately six per cent of Australian addresses are within three kilometers of the shoreline and in areas that are less than five meters above mean sea levels [6].
To support coastal settlements, extensive infrastructure is also located in coastal zones. Such coastally located infrastructures are particularly susceptible to sea level rise and its associated risks, including coastal flooding, seawater intrusion and storm surges. With future sea level rise, such events will be intensified [1][8]. Due to sea level rise and the related risks and impacts on infrastructure systems, coastal societies face multiple evolving hazards, including the immobilization of transportation, blackouts, saltwater intrusion of water supplies and cascading failures that can reverberate throughout the whole settlement system [9][10][11][12]. Insensitive urban development can interact with climate-related risks to exacerbate environmental vulnerability and intensify socio-ecological inequity [13][14].
Wastewater treatment plants (WWTPs) are particularly vulnerable when compared with other coastal infrastructures due to their inherent characteristics. For example, in order to minimize the need for energy and cost, coastal WWTPs are typically located at low elevations to collect the consumed water before discharging it through pipelines to adjacent water bodies under the action of gravity [15]. WWTPs are also particularly centralized [16][17] when compared with other infrastructure, such as transport and power generation systems, which have in-built redundancy. Therefore, WWTPs are more vulnerable due to their centralized structure [18]. Lastly, as WWTPs depend on transport and energy systems to function and be maintained, the failure of such systems can also have knock-on effects, leading treatment systems to fail [18]. If WWTPs services are interrupted or damaged due to sea level rise, extensive populations can be affected well beyond the zones directly inundated [18].

2. Climate-Related Risks to Wastewater Treatment Systems

There is a range of threats and risks related to coastally located WWTS. According to such current research, the foremost threat to WWTPs is flooding caused by climate-change-related sea level rise [18]. As sea levels rise, WWTPs situated in coastal areas with low elevation may be subjected to permanent flooding or frequent nuisance flooding due to high tide levels, other extreme weather events, such as storm surges, or a combination of these. In addition to the flooding exposure of coastal WWTPs, increased sea levels can also block outfalls from the system or reduce the efficiency of discharge [18]. Without the assistance of additional or larger pumps and pipelines, the flow rates will cease or decrease, causing siltation and effluent backflow, leading to further maintenance and repair costs [15]. Furthermore, the debris left by the flooding may also block the inlets or outlets of pipelines and cause major damage [15].
In addition to flooding, coastal storms are one of the most serious threats to coastal communities, resulting in huge human and economic losses every year [19][20][21]. The risk to WTTS due to flooding caused by coastal storms has been recognized as a worldwide problem. For example, in September 2004, Hurricane Ivan produced a 4-m-plus storm surge in Pensacola, USA, which resulted in the local WWTP experiencing four days of significant flooding and power outages [22]. More recently, a storm hit Colorado in 2013. The WWTP was breached, and massive quantities of untreated wastewater polluted the sea [23]. In recent decades, extreme coastal storms and related hazards have intensified due to SLR and show an upward trend. In Australia, about 87% of the total economic damage each year is caused by weather-related factors, mostly due to floods, storms and tropical cyclones [24]. With future climate change and SLR expected to continue, extreme events will continue to intensify and become more frequent. In the next 100 years, Australia will experience increasing coastal vulnerability to its many WWTS (Figure 1) and other infrastructure due to climate-change-related events [25]. As summarized in Table 1, sea level rise poses a number of direct threats and impacts on WWTPs.
Sustainability 15 08977 g001 550
Figure 1. Map of the 511 wastewater treatment plants in Australia with their locations shown in red. In total, 321 of them are located along the coast. Many of these are under the threat from sea level rise (Figure by authors using data from Geosciences Australia).
Table 1. Sea level rise (SLR)-induced effects on WWTPS.
SLR Impacts on Wastewater Treatment Plant
SLR can induce land subsidence and alter topography and pipeline gradients, increasing the risk of sewer overflow and the rupture of WWTP pipelines and utilities [18][26][27].
SLR can increase groundwater levels and subsequent saltwater intrusion into aquifers, leading to the corrosion of sewer pipes and other WWTP infrastructure [28][29].
SLR-related groundwater level increases can exert uplift forces on pipelines and utilities, again causing rupture and altering flows [30].
SLR-related saltwater intrusion can result in increased maintenance costs for wastewater treatment plants due to the need for a desalination process [18].
Excessive water can overwhelm WWTPs, resulting in wastewater backup and flooding in nearby residential or low-lying areas [18].
The weight of floodwaters has the potential to cause structural damage to wastewater treatment plants, resulting in untreated wastewater being discharged into the surrounding environment [31].
Due to groundwater table levels rising WWTTPs may experience areal flooding, causing them to cease functioning [15][18].
Debris from sea-level-rise-related flooding has the potential to cause blockages within pipe inlets, outlets and pipelines [15].
‘Inflow’ can occur, involving the entry of water into a sewage collection system through surface apertures following a flooding event, causing WTTPs and related systems to cease functioning [29].

3. Interactions between Wastewater Treatment Systems and Coastal Ecosystems

Within South Australia, wastewater treatment systems are frequently in close proximity to coastal ecosystems. Such wetlands typically include seagrasses, intertidal mangroves and supratidal samphire or salt marsh vegetation. Coastal ecosystems, especially mangroves, are well known for their ecological importance, providing breeding and nursery sites for crustaceans, shellfish, fish, birds and mammals. In addition, they contribute a range of significant economic and social services as a form of green–blue infrastructure. For example, they help ameliorate greenhouse gas emissions through carbon sequestration. According to Danielsen [32], although mangroves account for only 0.5% of coastal areas worldwide, they contribute 10–15% in coastal sediment carbon storage and export 10–11% of terrestrial particulate carbon to the ocean. They also help to significantly attenuate wave energy to mitigate coastal storm surge hazards. Experimental models have demonstrated that 30 mangrove trees per 100 m2 in a 100 m wide belt have the potential to attenuate the maximum tsunami flow pressure by more than 90% [33]. More recently, Sun and Carson [21] quantified the disaster cost avoidance savings delivered by mangroves and coastal wetlands. However, coastal ecosystems are under threat globally due to climate change and other human-related impacts, such as land use change. Alongi [34] indicates that one-third of mangrove forests have disappeared during the last 50 years. Such environmental degradation processes will exacerbate sea level rise and increase the number of threats related to coastal WWTPs and other infrastructure.
One of the most serious factors associated with sea level rise resulting in coastal wetland system loss has been described as ‘coastal squeeze’ [35][36][37]. Even though mangroves and other coastal ecosystems often have the capacity to migrate as sea levels rise, such inland movement is often blocked or “squeezed” by natural or built topographic conditions [37][38]. For example, the inland movement of coastal ecosystems can be blocked by topographic features, such as embankments, roads, seawalls or natural dune systems [38][39][40]. Researchers, therefore, consider such coastal ecosystems as a critical element in developing and shaping future coastal landscapes.

References

  1. Nicholls, R.J.; Cazenave, A. Sea Level Rise and Its Impact on Coastal Zones. Science 2010, 328, 1517–1520.
  2. Fox-Kemper, B.; Hewitt, H.T.; Xiao, C.; Aðalgeirsdóttir, G.; Drijfhout, S.S.; Edwards, T.L.; Golledge, N.R.; Hemer, M.; Kopp, R.E.; Krinner, G.; et al. Ocean, Cryosphere, and Sea Level Change—Supplementary Material. In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change; Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S.L., Péan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M.I., et al., Eds.; Cambridge University Press: Cambridge, UK, 2021.
  3. Masson-Delmotte, V.; Zhai, P.; Pirani, A.; Connors, S.L.; Péan, C.; Berger, S.; Caud, N.; Chen, Y.; Goldfarb, L.; Gomis, M.I.; et al. (Eds.) Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change; Cambridge University Press: Cambridge, UK, 2021.
  4. Siegert, M.; Alley, R.B.; Rignot, E.; Englander, J.; Corell, R. Twenty-First Century Sea-Level Rise Could Exceed IPCC Projections for Strong-Warming Futures. One Earth 2020, 3, 691–703.
  5. Church, J.A.; Stocker, T.F.; Qin, D.; Plattner, G.K.; Tignor, M.; Allen, S.K.; Boschung, J.; Nauels, A.; Xia, Y.; Bex, V.; et al. Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change; Cambridge University Press: Cambridge, UK, 2013.
  6. Chen, K.; McAneney, J. High-Resolution Estimates of Australia’s Coastal Population. Geophys. Res. Lett. 2006, 33, GL026981.
  7. Wise, R.M.; Capon, T.R. Information Manual 2: Understanding Sea-Level Rise and Climate Change, and Associated Impacts on the Coastal Zone; Commonwealth Scientific and Industrial Research Organization (CSIRO): Canberra, Australia, 2014.
  8. Hinkel, J.; Aerts, J.C.; Brown, S.; Jiménez, J.A.; Lincke, D.; Nicholls, R.J.; Scussolini, P.; Sanchez-Arcilla, A.; Vafeidis, A.; Addo, K.A. The Ability of Societies to Adapt to Twenty-First-Century Sea-Level Rise. Nat. Clim. Chang. 2018, 8, 570–578.
  9. Abel, N.; Gorddard, R.; Harman, B.; Leitch, A.; Langridge, J.; Ryan, A.; Heyenga, S. Sea Level Rise, Coastal Development and Planned Retreat: Analytical Framework, Governance Principles and an Australian Case Study. Environ. Sci. Policy 2011, 14, 279–288.
  10. Gornitz, V.; Couch, S.; Hartig, E.K. Impacts of Sea Level Rise in the New York City Metropolitan Area. Glob. Planet. Chang. 2001, 32, 61–88.
  11. Tacoli, C. Crisis or Adaptation? Migration and Climate Change in a Context of High Mobility. Environ. Urban. 2009, 21, 513–525.
  12. Tol, R.S. The Economic Effects of Climate Change. J. Econ. Perspect. 2009, 23, 29–51.
  13. Hawken, S.; Avazpour, B.; Harris, M.S.; Marzban, A.; Munro, P.G. Urban Megaprojects and Water Justice in Southeast Asia: Between Global Economies and Community Transitions. Cities 2021, 113, 103068.
  14. Hsu, Y.-Y.; Hawken, S.; Sepasgozar, S.; Lin, Z.-H. Beyond the Backyard: GIS Analysis of Public Green Space Accessibility in Australian Metropolitan Areas. Sustainability 2022, 14, 4694.
  15. Friedrich, E.; Kretzinger, D. Vulnerability of Wastewater Infrastructure of Coastal Cities to Sea Level Rise: A South Africa Case Study. Water SA 2012, 38, 755–764.
  16. Cahoon, L.B.; Hales, J.C.; Rowland, K.R.; Carey, E.S.; Loucaides, S.; Nearhoof, J.E. Shellfising Closures in Southwest Brunswick County, North Carolina: Septic Tanks vs. Storm Water Runoff as Fecal Coliform Sources. J. Coast. Res. 2006, 22, 319–327.
  17. Reay, W.G. Septic Tank Impacts on Ground Water Quality and Nearshore Sediment Nutrient Flux. Ground Water 2004, 42, 1079–1089.
  18. Almeida, B.A.; Mostafavi, A. Resilience of Infrastructure Systems to Sea-Level Rise in Coastal Areas: Impacts, Adaptation Measures, and Implementation Challenges. Sustainability 2016, 8, 1115.
  19. Davlasheridze, M.; Atoba, K.O.; Brody, S.; Highfield, W.; Merrell, W.; Ebersole, B.; Purdue, A.; Gilmer, R.W. Economic Impacts of Storm Surge and the Cost-Benefit Analysis of a Coastal Spine as the Surge Mitigation Strategy in Houston-Galveston Area in the USA. Mitig. Adapt. Strateg. Glob. Chang. 2019, 24, 329–354.
  20. Fischbach, J.R.; Johnson, D.R.; Groves, D.G. Flood Damage Reduction Benefits and Costs in Louisiana’s 2017 Coastal Master Plan. Environ. Res. Commun. 2019, 1, 111001.
  21. Sun, F.; Carson, R.T. Coastal Wetlands Reduce Property Damage during Tropical Cyclones. Proc. Natl. Acad. Sci. USA 2020, 117, 5719–5725.
  22. Haag, T. Hurricane Ivan Spurs Effort to Construct Pensacola Wastewater Reclamation Facility. Fla. Water Resour. J. 2009, 12–14. Available online: http://fwrj.com/techarticles/1009%20Tech1.pdf (accessed on 11 January 2023).
  23. The Denver Post. E. coli Found in Colorado Flood Zones, but No Oil, Gas Contamination. The Denver Post, 8 October 2013.
  24. Bureau of Transport Economics. Economic Costs of Natural Disasters in Australia; Bureau of Transport Economics: Canberra, Australia, 2001.
  25. Pittock, B. Climate Change: An Australian Guide to the Science and Potential of Impacts, Deportment for the Environment and Heritage; Australian Greenhouse Office: Canberra, Australia, 2003.
  26. Abidin, H.Z. Study on the Risk and Impacts of Land Subsidence in Jakarta. Proc. Int. Assoc. Hydrol. Sci. 2015, 372, 115–120.
  27. Chughtai, F.; Zayed, T. Infrastructure Condition Prediction Models for Sustainable Sewer Pipelines. J. Perform. Constr. Facil. 2008, 22, 333–341.
  28. Rotzoll, K.; Fletcher, C.H. Assessment of Groundwater Inundation as a Consequence of Sea-Level Rise. Nat. Clim. Chang. 2013, 3, 477–481.
  29. Flood, J.F.; Cahoon, L.B. Risks to Coastal Wastewater Collection Systems from Sea-Level Rise and Climate Change. J. Coast. Res. 2011, 27, 652–660.
  30. Noi, L.V.T.; Nitivattananon, V. Assessment of Vulnerabilities to Climate Change for Urban Water and Wastewater Infrastructure Management: Case Study in Dong Nai River Basin, Vietnam. Environ. Dev. 2015, 16, 119–137.
  31. Blumenau, A. Effects of Sea Level Rise on Water Treatment & Wastewater Treatment Facilities. Bachelor’s Thesis, Worcester Polytechnic Institute, Worcester, MA, USA, 2011.
  32. Danielsen, F.; Sørensen, M.K.; Olwig, M.F.; Selvam, V.; Parish, F.; Burgess, N.D.; Suryadiputra, N. The Asian Tsunami: A Protective Role for Coastal Vegetation. Sci. Am. Assoc. Adv. Sci. 2005, 310, 643.
  33. Hiraishi, T. Green Tsunami Prevention in South-Pacific Region. Rep. Port Airpt. Res. Inst. 2003, 42, 1–23.
  34. Alongi, D.M. Present State and Future of the World’s Mangrove Forest. Environ. Conserv. 2002, 29, 331–349.
  35. Chávez, V.; Lithgow, D.; Losada, M.; Silva-Casarin, R. Coastal Green Infrastructure to Mitigate Coastal Squeeze. J. Infrastruct. Preserv. Resil. 2021, 2, 7.
  36. Cooper, J.A.G.; O’Connor, M.C.; McIvor, S. Coastal Defences versus Coastal Ecosystems: A Regional Appraisal. Mar. Policy 2020, 111, 102332.
  37. Silva, R.; Martínez, M.L.; van Tussenbroek, B.I.; Guzmán-Rodríguez, L.O.; Mendoza, E.; López-Portillo, J. A Framework to Manage Coastal Squeeze. Sustainability 2020, 12, 10610.
  38. Borchert, S.M.; Osland, M.J.; Enwright, N.M.; Griffith, K.T. Coastal Wetland Adaptation to Sea Level Rise: Quantifying Potential for Landward Migration and Coastal Squeeze. J. Appl. Ecol. 2018, 55, 2876–2887.
  39. Doody, J.P. Coastal Squeeze and Managed Realignment in Southeast England, Does It Tell Us Anything about the Future? Ocean Coast. Manag. 2013, 79, 34–41.
  40. Pontee, N. Defining Coastal Squeeze: A Discussion. Ocean Coast. Manag. 2013, 84, 204–207.
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