Multi-scale assessment of drought-induced forest dieback

Detalhes bibliográficos
Autor(a) principal: Chakraborty, Tanmoy
Data de Publicação: 2020
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/94403
Resumo: Dissertation submitted in partial fulfilment of the requirements for the degree of Master of Science in Geospatial Technologies
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spelling Multi-scale assessment of drought-induced forest diebackClimate changeForest ecosystemsRemote sensing dataSoil Moisture IndexCORINE Land Cover (CLC)Dissertation submitted in partial fulfilment of the requirements for the degree of Master of Science in Geospatial TechnologiesDrought has been intensified over the years and will continue to worsen due to climate change. Existing works have focused their attention on crops rather than forests. Adverse effects are felt by all flora and fauna but the impact of the recent droughts on forest ecosystems is still unknown. Greater root depth allows them to withstand the immediate impacts of drought in contrast to crops and other vegetation. This study aims to see not only the interaction between drought and forest vitality from a multi-scale and temporal viewpoint while also to detect the impact of the recent 2018/19 drought on forest vitality based on remote sensing data. The data from the German Drought Monitor was used for the area-wide estimation of drought in Germany. Vegetative indices like NDVI collected from MODIS and Sentinel 2A were used to study the interactions between drought and forest vitality. Data for both have been acquired for the years 2000-2019. A long-standing time series data was decomposed and seasonally adjusted for better cross-correlation between the variables. The cross-correlation was verified by using breakpoints estimation by dividing the data into historically observed and test data. The coniferous-dominated black forest was used as a study area for a more in-depth analysis. Results showed that forest vitality was lowest one month after a severe drought, indicated by the highest decline in NDVI for all the forest types. This was verified using high resolution Sentinel images and the highest change does correspond to the month of January 2019. There was change in NDVI of over -0.5 for 80.63% of the entire study area. The change for each forest type was 81.74%, 54.42%, 84.14% for coniferous, broadleaved and mixed forests respectively. Two decades of NDVI and Soil Moisture Index (SMI) data along with Sentinel images for better area calculation because of higher resolution make this a highly effective approach to assess the impacts of drought on forest dieback. The methodology and data can be applied across the study area and with suitable drought indices can be used to assess the drought induced forest dieback across the globe. However, in-situ analysis with ecological considerations at the individual level could further the validity of the cross-correlations among forest types and drought. Reproducibility self-assessment (https://osf.io/j97zp/): 3, 2, 3, 1, 3 (input data, pre-processing, methods, computational environment, results).Meyer, HannaPrinz, TorstenGranell-Canut, CarlosRUNChakraborty, Tanmoy2020-03-17T15:42:36Z2020-01-312020-01-31T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/94403TID:202459748enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T04:42:23Zoai:run.unl.pt:10362/94403Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:37:56.902838Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Multi-scale assessment of drought-induced forest dieback
title Multi-scale assessment of drought-induced forest dieback
spellingShingle Multi-scale assessment of drought-induced forest dieback
Chakraborty, Tanmoy
Climate change
Forest ecosystems
Remote sensing data
Soil Moisture Index
CORINE Land Cover (CLC)
title_short Multi-scale assessment of drought-induced forest dieback
title_full Multi-scale assessment of drought-induced forest dieback
title_fullStr Multi-scale assessment of drought-induced forest dieback
title_full_unstemmed Multi-scale assessment of drought-induced forest dieback
title_sort Multi-scale assessment of drought-induced forest dieback
author Chakraborty, Tanmoy
author_facet Chakraborty, Tanmoy
author_role author
dc.contributor.none.fl_str_mv Meyer, Hanna
Prinz, Torsten
Granell-Canut, Carlos
RUN
dc.contributor.author.fl_str_mv Chakraborty, Tanmoy
dc.subject.por.fl_str_mv Climate change
Forest ecosystems
Remote sensing data
Soil Moisture Index
CORINE Land Cover (CLC)
topic Climate change
Forest ecosystems
Remote sensing data
Soil Moisture Index
CORINE Land Cover (CLC)
description Dissertation submitted in partial fulfilment of the requirements for the degree of Master of Science in Geospatial Technologies
publishDate 2020
dc.date.none.fl_str_mv 2020-03-17T15:42:36Z
2020-01-31
2020-01-31T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/94403
TID:202459748
url http://hdl.handle.net/10362/94403
identifier_str_mv TID:202459748
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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