Modelling past and future land cover changes. A multi-scale approach applied in the Pyrénées

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Eprints ID: 16342

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To cite this version :

Houet, Thomas and Galop, Didier and Mazier,

Florence and Sheeren, David and Dejoux, Jean-François Modelling

past and future land cover changes. A multi-scale approach applied

in the Pyrénées. (2012) In: AGILE 2012, 23 April 2012 - 27 April

2012 (Avignon, France)

Any correspondence concerning this service should be sent to the repository

administrator: [email protected]

M

ODELLING PAST AND FUTURE LAND USE AND COVER CHANGES

A



MULTI

Ͳ

SCALE APPROACH APPLIED IN THE

P

YRENEES

–

THE

MODE

RESPYR

PROJECT

D.Sheeren

LaboratoireDYNAFOR UMR 1201 INPͲENSAT/INRA

T.Houet*,D.Galop,F.Mazier

LaboratoireGEODE UMR5602CNRS/UTM

J.ͲF.Dejoux

LaboratoireCESBIO UMR 5126 CNRS/IRD/CNES UMR1201INP ENSAT/INRA UniversitédeToulouse BP32607,31326CastanetTolosanCedex,France UniversitédeToulouse 5al.Machado,31058Toulouse,France *Projectleader:thomas.houet@univͲtlse2.fr

CONTEXTANDOBJECTIVES

Context

Ͳ Land cover changes have significant impacts on local and regional climate and on others environmental issues.

Ͳ Understanding past LUCC is essential to reduce uncertainties related to current changes, identify driving forces of LUCC and better anticipate future changes

UMR5126CNRS/IRD/CNES UniversitédeToulouse

18av.EdouardBelin,31401ToulouseCedex,France

Scientific & Methodological issues

Ͳ Providing knowledge on past and future land use and cover changes with heterogeneous datasets Ͳ Simulating local / regional land use and cover changes using spatially explicit models

Ͳ Simulating past / futures land use and cover changes based on scenarios identify driving forces of LUCC and better anticipate future changes

Ͳ Under climate change assumptions, Pyrenees mountains will face dramatic effects of climate change and show high environmental stakes (water / snow resources, biomass, biodiversity...)

PROJECTMETHODOLOGY

Ͳ What is the role of spatial approaches in prospective research?

Ͳ What spatial and temporal resolutions are required for short / long term projections?

STUDYSITES

ThePyrenees

Vicdessos

Davantaygue

Garroxtes

HumanͲEnvironmentObservatory 244km²Ͳ 7municipalities LongTermEcologicalResearchsite 76km²Ͳ 6municipalities 25yearsofobservations/studies 85km²Ͳ 5municipalities Ayros Arbouix

Suc-et-Boundariesof the mountainous area

Local study sites

Davantaygue Vicdessos Garrotxes

PRELIMINARY RESULTS

Task1:RegionalLUCCoverlast12000yearsusingpalaeoͲenvironmentaldataandmodels Task2:LocalLUCCoverlast60Ͳ120yearsusinghistoricalmaps/aerialphotographs Task3:RegionalLUCCoverlast15Ͳ20yearsusinghighresolutionsatelliteimageries

Task 4: Modelling past / future LUCC based on scenarios and dynamic/spatially explicit models

Integrationof knowledge

Participatory approach

Building

scenarios Use/Developmentofmodels Villelongue Beaucens Artalens-Souin Vier-Bordes Préchac Auzat Vicdessos Goulier sentenac Lercoul Orus Sem N 1.5km N 4km N 2km Sansa Caudies-de-Conflent Oreilla Railleu Ayguatebia-Talau

PRELIMINARYRESULTS

LUCCdatabases

ConstitutionofLUCCdatabasesbasedonareliable landuseandcovertypology Ͳ Palaeodatabase(PALEOPYRandinsitucores)

LocalLUCCoverthelastCentury

2009 1976 Linkinggrazingactivitiesandlanduseandcoverchanges(Galopetal.2011) Æ ComparisonoflocalLUCC(cf.Sheerenetal2012Ͳ PosterAGILE’2012) Æ CombiningpalaeoandGISdatasforunderstandingLUCC ͲSatelliteimageriespreͲtreatmentandclassification (1994,2002/03,2009/10)– (Hagolleetal2008) Ͳ Landuseandcovermapsfrom1940’s(Houetetal2012)

CONCLUSION

WEBSITE

http://w3.modeͲrespyr.univͲtlse2.fr MODERESPYR(2011Ͳ2015)isaongoingprojectintegratingheterogeneousspatiallyexplicitLUCCdataandcouplingvariousdisciplines. Æ LUCCdatabasesarenearlyfinalizedandmultiͲscaledanalyseshavestartedaswellasmodelcomparisonandexploration. Æ Locallandscapechangesaremostlyattributedtohumanlandusechangesratherthanglobalwarmingandhavetobecomparedwith regionaltrends Æ Participatoryandscenariosapproacheswillbeperformedformodellingfutureandpastlocalandregionallanduseandcoverchanges

REFERENCES

Galop D.,HouetT.,Mazier F.,Leroux G.,Rius D.(2011)GrazingactivitiesandbiodiversityhistoryinthePyrénées – theuseofpaleoecology andhistoricalecologytoprovidenewinsightsonhighͲaltitude ecosystemsintheframeworkofaHumanͲEnvironmentObservatory,PAGESnews,(19)2:53Ͳ56,2011.

HouetT.,Ribière O.,Vacquié L.,VidalF.,Galop D.(Sous presse)Analyse spatiale del’évolution desmodesd’occupation etd’usages dessolssur leVicdessos de1942ànos jours,SudͲOuest Européen,Accepté. Shereen D.,Ribière O.,Raynaud B.,Ladet S.,Paegelow M.,HouetT.(2012)Assessing land cover changes in the French Pyrenees since the 1940s: a semi-automatic GEOBIA approach using aerial photographs,

ProceedingsofAGILE2012symposium

Hagolle O.,Dedieu G.,Mougenot,B.,Debaecker,V.,Duchemin ,B.,Meygret ,A.(2008)CorrectionofaerosoleffectsonmultiͲtemporalimagesacquiredwithconstantviewingangles:Applicationto FormosatͲ2imagesRemotesensingEnvironment,112(4):1689Ͳ1701,2008

Project founded by ANR Jeune Chercheur / Jeune Chercheuse MODE RESPYR (2010 JCJC 1804 01 – 01)