Modelling Sea-Level Rise in the Lisbon city coastal area, using Free and Open Source Technologies
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1 Modelling Sea-Level Rise in the Lisbon city coastal area, using Free and Open Source Technologies B. Neves(1), C. Rebelo(1) and A.M. Rodrigues(1) (1) e-geo Research Centre for Geography and Regional Planning, Faculdade de Ciências Sociais e Humanas FCSH, Universidade Nova de Lisboa, Avenida de Berna 26-C, P , Lisboa, brunomaneves, crebelo,
2 Contents State of the art Sea-Level Rise (SLR) SLR Scenarios Objectives Case study area Methodologies Results Discussion Future Work 2
3 State of the art Sea-Level Rise (SLR) Sea-level rise & climate change (Intergovernmental Panel on Climate Change, 1990) Currently, sea-level is in an ascendant situation Acceleration since second half of XX Century Greenhouse Gases & anthropic activities No consensus on sea-level rise projections Due to complexity of SLR drivers 3
4 State of the art Sea-Level Rise (SLR) 4 main SLR drivers Thermal expansion of the oceans The melting of Antarctic and Greenland ice sheets Glaciers and ice caps Groundwater depletion and reservoirs 4
5 State of the art Sea-Level Rise (SLR) Time-scale SLR drivers Longer (over millions of years) Intermediate (hundreds of tens of thousands of years) (a) continental collision; (b) dynamic topography fluctuations due to mantle convection; (c) sedimentation; (d) variations in the mean spreading rate of sea floor glacial isostatic adjustments Shorter Dynamic (a) ocean-atmosphere interactions; (b) ocean circulation; (c) ocean tides; (d) salinity; (e) temperature variations Static (a) deformational; (b) gravitational; and (c) rotational signatures of mass flux from polar ice sheets and mountain glaciers 5
6 Sea-Level Rise Scenarios Two main approaches Physical Considers each of the mentioned drivers individually Semi-empirical Direct relationship between a global average near surface air temperature and sea-level rise observed in the past century 6
7 Sea-level Rise Scenarios Authors Scenario time-scale Minimum value Maximum value Hansen and Sato, ,00 m IPCC, ,18 m 0,59 m IPCC, ,19 m 0,63 m Jevrejeva et al., ,60 m 1,60 m Pfeffer et al., ,80 m 2,00 m Rahmstorf, ,50 m 1,40 m Rohling et al., ,60 m 2,50 m Vermeer and Rahmstorf, ,81 m 1,79 m WOR, ,50 m 5,10 m Jevrejeva et al., ,84 m 5,49 m 7
8 Objectives Modelling sea-level rise Hydrologic Modelling Lisbon city (general) 5,49m projection São Nicolau parish (particular) 2,50m projection 0m actual mean sea level Based on two scenarios Rohling Rohlinget etal., al., SLR SLR2,5m 2,5m--year year Jevrejeva Jevrejevaet etal., al., SLR SLR5,49m 5,49m--year year Processing: GRASS GIS 6.4.3RC1 Post-processing: Quantum GIS Desktop version LISBOA Windows 7 Home Premium, 64-bit Operating System, Service Pack 1, with 8GB RAM in Intel(R) Core(TM) i5-2450m 2.50GHz. 8
9 Case study area 9
10 Methodologies Initial data RASTER Lisbon 10
11 Methodologies Original Data Lisbon Data selection and conversion São Nicolau Vector 1 Case study areas Pixel dimension 1m Raster 1m 11 11
12 Methodologies Data selection and conversion Original RASTER Lisbon 1 São Nicolau Case study areas Pixel dimension 1m 1m 12 12
13 Methodologies Hidrologic Modelling Lisbon Scenarios (A1, A2); São Nicolau Scenarios (B1, B2) Lisboa A1- SLR 2,5m A2 - SLR 5,49m São Nicolau 1 B1- SLR 2,5m B2 - SLR 5,49m
14 Methodologies Raster reclassification Lisbon Scenarios A1 and A2 São Nicolau Range of data to Unique value 1 Senarios B1 and B2 Range of data to Unique value 14 14
15 Methodologies Map conversion from raster to vector Processing to post-processing Cleaning of residual information Lisbon & São Nicolau A1 A2 Sample Layer Scenario B2 B1 B2 15
16 Methodologies Adding of new fields to vector data $area & $perimeter To calculate total affected areas Scenario A1 Scenario A2 Scenario B1 Scenario B2 16
17 Results Lisbon - Scenario A1 Scenario A2 Total area: 8550,04ha Flooded area: 66,91ha (0,78%) Total area: 8550,04ha Flooded area: 442,95ha (5,18%) Total number of buildings: Buildings in flooded area: 26 (0,04%) Total number of buildings: Buildings in flooded area: 1882 (2,88%) 17
18 Results São Nicolau Scenario B1 Scenario B2 Total area: 26,33ha Flooded area: 0,27ha (1,02%) Total area: 26,33ha Flooded area: 9,66ha (36,69%) Total buildings: 611 Buildings in flooded area: 1 (0,16%) Total buildings: 611 Buildings in flooded area: 85 (13,91%) 18
19 Discussion Despite uncertainties amongst scientific community on how much sea-level will rise It is factual that sea-level is rising Inclusion on sea-level rise scenarios on land planning and management Impacts on scenarios A1 and B1 (year 2100) are punctual On A2 and B2 scenarios (year 2500) its impacts are significant GRASS GIS 6.4.3RC1 performed well in all requested tasks In 3D visualization data, for São Nicolau parish ( cells) GRASS GIS 6.4.3RC1 performed well GRASS GIS 6.4.3RC1 crashed performing the 3D of Lisbon ( cells) 19
20 Future work Explore more Hydrologic modelling tools Adding tides data Storm surge data Bringing more accuracy to SLR modeling Integration of population scenarios Additional data of services and infrastructures for more extensive analysis Mr. Z 20
21 Modelling Sea-Level Rise in the Lisbon city coastal area, using Free and Open Source Technologies Gràcies B. Neves, C. Rebelo and A.M. Rodrigues brunomaneves, crebelo, Acknowledgements This paper presents research results of the Strategic Project of e-geo (PEst-OE/SADG/UI0161/2011) Research Centre for Geography and Regional Planning funded by the Portuguese State Budget through the Fundação para a Ciência e a Tecnologia. 21
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