Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland
Sediment-related issues in reservoirs can often pose significant challenges to their operational effectiveness, sustainability, and environmental impact. Sustainable sediment management can help resolve these issues and extend the lifespan of dams. The reservoir in Andakílsá river in west Iceland is...
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KTH, Hållbar utveckling, miljövetenskap och teknik
2023
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ftkthstockholm:oai:DiVA.org:kth-337354 2023-10-29T02:37:22+01:00 Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland Bedömning av en sedimenthanteringslösning i en reservoar med hjälp av en HEC-RAS 2D-modell : Fallstudie av Andakílsá-floden på västra Island Gudgeirsdóttir, Emilía Sól 2023 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-337354 eng eng KTH, Hållbar utveckling, miljövetenskap och teknik TRITA-ABE-MBT 23516 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-337354 info:eu-repo/semantics/openAccess SediCon Sluicer Andakílsá Hydropower Station HEC-RAS 2D Sediment modelling Sustainable sediment management Andakílsá vattenkraftverk HEC-RAS 2D Sediment Modellering Hållbar sedimenthantering Engineering and Technology Teknik och teknologier Student thesis info:eu-repo/semantics/bachelorThesis text 2023 ftkthstockholm 2023-10-04T22:32:57Z Sediment-related issues in reservoirs can often pose significant challenges to their operational effectiveness, sustainability, and environmental impact. Sustainable sediment management can help resolve these issues and extend the lifespan of dams. The reservoir in Andakílsá river in west Iceland is one out of many reservoirs that has experienced sediment-related problems, and in this study, it was evaluated whether a particular sediment management solution called SediCon Sluicer could be a suitable solution for the site. More specifically, evaluate whether the river transport capacity is sufficient to transport the sediments released from the SediCon Sluicer outlet pipe, so they don’t settle and form thick deposit layers in the river bottom. A hydraulic model of the river was set up in a two-dimensional HEC-RAS model (version 6.3.1) and the Manning’s roughness coefficient in the channel calibrated using water level data. The Manning’s value 0.025 was found to best describe the channel roughness. A HEC-RAS 2D Sediment Transport model was then used to simulate different amount of sediments being released into the river for different flow scenarios. A flood event with 95% confidence level to occur once a year was found to have a peak flow of 50 m3/s and have a duration of around 18 hours. However, the average peak flow from the biggest flood events during a 14-year period was found to be 118 m3/s, and that type of flood events can have a duration up to 70 hours. The results from the sediment simulation scenarios showed that for flood events with long duration and high discharge, the yearly accumulated sediments could most likely all be flushed once a year without too much deposit in the river. A shorter flood event, that is almost certain to occur once a year, is not likely to be able to flush out all the yearly accumulated sediments all at once. Perhaps the SediCon sluicer could be operated several times a year, but a more detailed flow frequency analysis must reveal what smaller floods can be expected yearly. ... Bachelor Thesis Iceland Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA |
institution |
Open Polar |
collection |
Royal Institute of Technology, Stockholm: KTHs Publication Database DiVA |
op_collection_id |
ftkthstockholm |
language |
English |
topic |
SediCon Sluicer Andakílsá Hydropower Station HEC-RAS 2D Sediment modelling Sustainable sediment management Andakílsá vattenkraftverk HEC-RAS 2D Sediment Modellering Hållbar sedimenthantering Engineering and Technology Teknik och teknologier |
spellingShingle |
SediCon Sluicer Andakílsá Hydropower Station HEC-RAS 2D Sediment modelling Sustainable sediment management Andakílsá vattenkraftverk HEC-RAS 2D Sediment Modellering Hållbar sedimenthantering Engineering and Technology Teknik och teknologier Gudgeirsdóttir, Emilía Sól Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland |
topic_facet |
SediCon Sluicer Andakílsá Hydropower Station HEC-RAS 2D Sediment modelling Sustainable sediment management Andakílsá vattenkraftverk HEC-RAS 2D Sediment Modellering Hållbar sedimenthantering Engineering and Technology Teknik och teknologier |
description |
Sediment-related issues in reservoirs can often pose significant challenges to their operational effectiveness, sustainability, and environmental impact. Sustainable sediment management can help resolve these issues and extend the lifespan of dams. The reservoir in Andakílsá river in west Iceland is one out of many reservoirs that has experienced sediment-related problems, and in this study, it was evaluated whether a particular sediment management solution called SediCon Sluicer could be a suitable solution for the site. More specifically, evaluate whether the river transport capacity is sufficient to transport the sediments released from the SediCon Sluicer outlet pipe, so they don’t settle and form thick deposit layers in the river bottom. A hydraulic model of the river was set up in a two-dimensional HEC-RAS model (version 6.3.1) and the Manning’s roughness coefficient in the channel calibrated using water level data. The Manning’s value 0.025 was found to best describe the channel roughness. A HEC-RAS 2D Sediment Transport model was then used to simulate different amount of sediments being released into the river for different flow scenarios. A flood event with 95% confidence level to occur once a year was found to have a peak flow of 50 m3/s and have a duration of around 18 hours. However, the average peak flow from the biggest flood events during a 14-year period was found to be 118 m3/s, and that type of flood events can have a duration up to 70 hours. The results from the sediment simulation scenarios showed that for flood events with long duration and high discharge, the yearly accumulated sediments could most likely all be flushed once a year without too much deposit in the river. A shorter flood event, that is almost certain to occur once a year, is not likely to be able to flush out all the yearly accumulated sediments all at once. Perhaps the SediCon sluicer could be operated several times a year, but a more detailed flow frequency analysis must reveal what smaller floods can be expected yearly. ... |
format |
Bachelor Thesis |
author |
Gudgeirsdóttir, Emilía Sól |
author_facet |
Gudgeirsdóttir, Emilía Sól |
author_sort |
Gudgeirsdóttir, Emilía Sól |
title |
Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland |
title_short |
Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland |
title_full |
Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland |
title_fullStr |
Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland |
title_full_unstemmed |
Assessment of a sediment management solution in a reservoir with a sluicing technique using a HEC-RAS 2D model : Case study of Andakílsá river in west Iceland |
title_sort |
assessment of a sediment management solution in a reservoir with a sluicing technique using a hec-ras 2d model : case study of andakílsá river in west iceland |
publisher |
KTH, Hållbar utveckling, miljövetenskap och teknik |
publishDate |
2023 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-337354 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
TRITA-ABE-MBT 23516 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-337354 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1781062051609706496 |