Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles
River restoration is something that is often used to help restore watercourses that were historically used for timber floating. In these restorations, instream wood (IW) plays a big role in increasing biodiversity and habitat heterogeneity in watercourses. Uncrewed Aerial Vehicles (UAVs) have proven...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2023
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ftumeauniv:oai:DiVA.org:umu-209526 2023-10-09T21:54:36+02:00 Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles Egenskaper hos död ved efter en restaurering av ett alluvialt vattendrag : Användning av obemannade flygfordon Fjällberg, Martina 2023 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-209526 eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-209526 info:eu-repo/semantics/openAccess River restoration instream wood uncrewed aerial vehicles fluvial geomorphology Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap Physical Geography Naturgeografi Student thesis info:eu-repo/semantics/bachelorThesis text 2023 ftumeauniv 2023-09-22T14:00:12Z River restoration is something that is often used to help restore watercourses that were historically used for timber floating. In these restorations, instream wood (IW) plays a big role in increasing biodiversity and habitat heterogeneity in watercourses. Uncrewed Aerial Vehicles (UAVs) have proven to be useful when monitoring changes following river restoration but there is a need for less time-consuming methods to detect IW. This study’s objective was to investigate IW following a river restoration in an alluvial reach in Vargån, Northern Sweden and how well UAVs can be used to do this. Manual digitizing of IW was done in GIS from orthomosaics of three different flight occasions: pre-restoration, directly after and one year after restoration. An object- and color-based automated image thresholding was done to investigate if it could be used to automatically detect IW. The results showed that there were differences in number of IW, volume, width, and length between the different flight occasions. There was also indication that there had been movement of IW as well as changes in cluster composition, with more clusters with a higher number of wood pieces in the latest flight occasion. The automated image thresholding was able to accurately detect IW with an accuracy of 47,4 %, but it had limitations due to natural conditions. However, it showed the possibility of using automated methods to detect IW and with improvements it could become a faster and more accessible way of detecting IW in river monitoring. Bachelor Thesis Northern Sweden Umeå University: Publications (DiVA) |
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Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
River restoration instream wood uncrewed aerial vehicles fluvial geomorphology Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap Physical Geography Naturgeografi |
spellingShingle |
River restoration instream wood uncrewed aerial vehicles fluvial geomorphology Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap Physical Geography Naturgeografi Fjällberg, Martina Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles |
topic_facet |
River restoration instream wood uncrewed aerial vehicles fluvial geomorphology Other Earth and Related Environmental Sciences Annan geovetenskap och miljövetenskap Physical Geography Naturgeografi |
description |
River restoration is something that is often used to help restore watercourses that were historically used for timber floating. In these restorations, instream wood (IW) plays a big role in increasing biodiversity and habitat heterogeneity in watercourses. Uncrewed Aerial Vehicles (UAVs) have proven to be useful when monitoring changes following river restoration but there is a need for less time-consuming methods to detect IW. This study’s objective was to investigate IW following a river restoration in an alluvial reach in Vargån, Northern Sweden and how well UAVs can be used to do this. Manual digitizing of IW was done in GIS from orthomosaics of three different flight occasions: pre-restoration, directly after and one year after restoration. An object- and color-based automated image thresholding was done to investigate if it could be used to automatically detect IW. The results showed that there were differences in number of IW, volume, width, and length between the different flight occasions. There was also indication that there had been movement of IW as well as changes in cluster composition, with more clusters with a higher number of wood pieces in the latest flight occasion. The automated image thresholding was able to accurately detect IW with an accuracy of 47,4 %, but it had limitations due to natural conditions. However, it showed the possibility of using automated methods to detect IW and with improvements it could become a faster and more accessible way of detecting IW in river monitoring. |
format |
Bachelor Thesis |
author |
Fjällberg, Martina |
author_facet |
Fjällberg, Martina |
author_sort |
Fjällberg, Martina |
title |
Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles |
title_short |
Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles |
title_full |
Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles |
title_fullStr |
Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles |
title_full_unstemmed |
Characteristics of instream wood following alluvial river restoration : Using Uncrewed Aerial Vehicles |
title_sort |
characteristics of instream wood following alluvial river restoration : using uncrewed aerial vehicles |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2023 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-209526 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-209526 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1779318228634304512 |