Optimistic Scenario of 0.50 m Mean Sea Level Rise and Possible Environmental Impacts, Resulting from Tidal Variations, in the City of Niterói, Rio de Janeiro—Brazil
Abstract
:1. Introduction
2. Study Area
3. Materials and Methods
- (1)
- Use of the Digital Elevation Model (MDE), obtained by LiDAR (Light Detection and Ranging) technology, available on the SIGeo/Niterói portal [29], for vectorization, through the ArcGIS application, version 10.5, of the 1.20 m and 1.80 m altimetric contour lines, using as reference level the level of the mean lowest low water tide in the region. These levels correspond to the projections of a 0.50 m MSL rise, added, respectively by:
- (a)
- The HAT water level, which is 0.71m according to records of the Brazilian Navy Tidal Board [30]—Fiscal Island station/ Rio de Janeiro—approximated to 0.70 m, due to adequacy of the GIS;
- (b)
- The water level of 1.35 m, which considers the 0.60 m highest storm surge (HSS) water level—according to the Gloss-Brazil database [31], in records for the period 1963–2017—occurring concomitantly with the HAT. One approximated this water level to be 1.30 m due to the adequacy of GIS.
- (2)
- Overlaying through the ArcGis program of shapefiles of 1.20 m and 1.80 m altimetric contour lines; shapefile of land use and occupation, available on the SIGeo/Niterói portal [29]; shapefile of census tracts, available on the IBGE [32] page, aiming to obtain the areas of intersection, representative of the possible flood areas.
- (1)
- Percentage of classes of land use and occupation, inserted in the intersection area.
- (2)
- Population and number of households, inserted in the intersection area.
- (3)
- Possible economic impacts, considering the households eventually affected. For this purpose, the parameter “market value”—the average value of real estate, per Administrative Region, related to the real estate market—was used. In this case, the websites of specialized companies such as OLX [33] and Free Market [34] were researched. Approximately 10,000 advertisements from each company, regarding the ten most representative neighborhoods, were analyzed, considering advertisements found concomitantly in both databases. A 5% sample criterion was adopted, which allowed the selection of the 20th, 40th, 60th, 80th, 100th... advertisements, etc., extracting the average market value per neighborhood. In situations of incoherent advertisements, the first subsequent advertisement was selected. The average value of the properties was calculated as the simple average of the neighborhoods analyzed in each Administrative Region, considering the altimetric range. Finally, the obtained values were multiplied by the number of households.
- (4)
- Survey of other significant environmental impacts of MSL rise, through primary bibliographic sources, such as the Orla Project [23], including mangroves, shell midden, fishermen’s colonies, shipping stations, ship repair and building companies, land reclamation areas, higher education institution, etc.
- (5)
- Finally, one presents proposals to adapt or mitigate the possible impacts caused by the increase in the average sea level for each segment analyzed, according to the results found.
4. Results
4.1. Sea Level in Conditions of HAT: Elevation of 1.20 m
4.2. Sea Level in Conditions of HSS Concomitant with HAT: Elevation of 1.80 m
4.3. Other Environmental Aspects and Possible Impacts
5. Discussion
5.1. Rising Sea Levels and Its Impacts
5.2. Coastal Zone in Niterói and Brazil—Legal Aspects
6. Adaptation Proposals
7. Conclusions
Author Contributions
Funding
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Class | Municipality of Niterói (m2) | 1.20 m Altitude Range (m2) | Region/Range of 1.20 m Altitude (m2) | 1.80 m Altitude Range (m2) | Region/Range of 1.80 m Altitude (m2) | ||||
---|---|---|---|---|---|---|---|---|---|
Northern | Bay Beaches | Oceanic | Northern | Bay Beaches | Oceanic | ||||
Rocky Outcrop | 2,750,846 | 20,956 | 0 | 19,435 | 1521 | 52,742 | 0 | 33,541 | 19,201 |
Agricultural | 319,837 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Vegetal cover | 59,725,171 | 1,720,889 | 0 | 189,672 | 1,531,217 | 2,449,966 | 85,739 | 295,189 | 2,069,037 |
Industrial | 1,502,375 | 108,648 | 19,882 | 88,766 | 0 | 657,592 | 483,012 | 174,579 | 0 |
Military | 887,314 | 14,345 | 0 | 6077 | 8268 | 118,183 | 0 | 54,871 | 63,311 |
Disorderly Occupation | 9,270,956 | 14,428 | 0 | 0 | 14,428 | 42,116 | 376 | 864 | 40,875 |
Beach | 505,833 | 376,127 | 8656 | 145,222 | 222,248 | 396,025 | 8656 | 155,303 | 232,065 |
Urban | 44,307,123 | 181,242 | 1216 | 53,109 | 126,916 | 988,984 | 138,866 | 164,119 | 685,998 |
Total continental areas | 119,269,460 | 2,436,639 | 29,755 | 502,282 | 1,904,600 | 4,705,611 | 716,652 | 878,468 | 3,110,490 |
Body of Water | 4,683,083 | 4,451,861 | 0 | 0 | 4,451,861 | 4,514,652 | 1750 | 3013 | 4,509,888 |
Totals | 123,952,543 | 6,888,500 | 29,755 | 502,282 | 6,356,462 | 9,220,263 | 718,402 | 881,482 | 7,620,378 |
Class | 1.20 m Altitude Range | Region | 1.80 m Altitude Range | Region | ||||
---|---|---|---|---|---|---|---|---|
Northern | Bay Beaches | Oceanic | Northern | Bay Beaches | Oceanic | |||
Population (unit) | 1565 | 14 | 14 | 1537 | 14,490 | 2845 | 2532 | 9113 |
Households (unit) | 501 | 5 | 5 | 491 | 4868 | 948 | 972 | 2948 |
Total market value (R$) | 616,972,178 | 1,734,957 | 4,360,185 | 610,877,036 | 4,801,618,374 | 286,247,652 | 847,620,207 | 3,667,750,515 |
Aspects | Possible Impacts | Control Measures/Possible Solutions | Sources Bibliographic |
---|---|---|---|
Biophysical | Erosion | Monitoring. Engineering works: installation of adherent and/or detached, soft and/or rigid protective structures, and/or maintenance of natural systems. e.g.: breakwaters; beache nourishment, etc. | [18,36,37,38,39,51,52,53] |
Inundation | Monitoring. Engineering works: installation of adherent, soft and/or rigid protective structures, and/or maintenance of natural systems. E.g. mangrove maintenance. Implementation of effective public policies. | [18,36,37,38,39,51,52,53,54,55] | |
Flooding | Improvement of urban drainage systems. Implementation of mechanisms to increase soil permeability. Installation of large-scale water pumping systems. | [38,45] | |
Loss of natural coastal protection areas | Ensure the maintenance of natural systems (wetlands, dunes and beaches). E.g. beach nourishment. Obs.: urbanization acts as a limiting factor for the migration of these systems. | [18,36,37,38,39,40,52] | |
Socioeconomic | Damage/loss of urban settlements | Implementation of effective coastal protection techniques. Monitoring. Elaboration of appropriate public policies regarding land use. In extreme cases, relocation of people. | [16,46,55] |
Damage/loss of urban structures | Implementation of effective coastal protection techniques. Monitoring. Elaboration of appropriate public policies regarding land use. Projects to adapt urban structures. | [16,45,46,55] | |
Damage/loss of transport terminals | Implementation of effective coastal protections. Projects to adapt the structures of transport terminals (stations, ports, etc.). | [45] | |
Damage to coastal protection structures | Adequate project planning of regarding dimensioning and materials applied. Monitoring and maintenance. | [38,51,53] |
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Dias Ferreira, V.L.; Santos Pereira, E.; Souza de Mello, L.P.; Garcia Silva, R.A.; Dias, F.F. Optimistic Scenario of 0.50 m Mean Sea Level Rise and Possible Environmental Impacts, Resulting from Tidal Variations, in the City of Niterói, Rio de Janeiro—Brazil. Coasts 2023, 3, 209-226. https://doi.org/10.3390/coasts3030013
Dias Ferreira VL, Santos Pereira E, Souza de Mello LP, Garcia Silva RA, Dias FF. Optimistic Scenario of 0.50 m Mean Sea Level Rise and Possible Environmental Impacts, Resulting from Tidal Variations, in the City of Niterói, Rio de Janeiro—Brazil. Coasts. 2023; 3(3):209-226. https://doi.org/10.3390/coasts3030013
Chicago/Turabian StyleDias Ferreira, Vilmar Leandro, Elizabeth Santos Pereira, Lucas Pluvie Souza de Mello, Rodrigo Amado Garcia Silva, and Fábio Ferreira Dias. 2023. "Optimistic Scenario of 0.50 m Mean Sea Level Rise and Possible Environmental Impacts, Resulting from Tidal Variations, in the City of Niterói, Rio de Janeiro—Brazil" Coasts 3, no. 3: 209-226. https://doi.org/10.3390/coasts3030013