Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes
Deltaic processes were studied on the Laitaure delta. Specific aims were to: analyse forms and processes in distributaries with regard to hydraulic geometry relationships; investigate the distribution of water into different distributaries; analyse the morphological development of the delta; and qua...
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Uppsala universitet, Institutionen för geovetenskap
1994
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ftuppsalauniv:oai:DiVA.org:uu-352156 2023-05-15T17:06:58+02:00 Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes Andrén, Hans 1994 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-352156 eng eng Uppsala universitet, Institutionen för geovetenskap Uppsala UNGI rapport, 0375-8109 88 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-352156 urn:isbn:91-506-1068-6 info:eu-repo/semantics/openAccess Recent delta formation hydraulic geometry distributary forms and processes X-ray radiography Sarek Lappland Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Doctoral thesis, monograph info:eu-repo/semantics/doctoralThesis text 1994 ftuppsalauniv 2023-02-23T21:47:40Z Deltaic processes were studied on the Laitaure delta. Specific aims were to: analyse forms and processes in distributaries with regard to hydraulic geometry relationships; investigate the distribution of water into different distributaries; analyse the morphological development of the delta; and quantify the advance of the delta front. Further, a brief study was made of the bottom sediments in Lake Laitaure. It was concluded that distributaries may be distinguished by at-a-station hydraulic geometry relationships, depending on their state of activity and their location in the delta, i.e. distance to the delta front. Differences in activity between distributaries were also shown by the “delta” (analogous to downstream) hydraulic geometry relationships. Large similarities in “delta” hydraulic geometry were found between the Laitaure delta and the Volga and Danube deltas (cf. Mikhailov, 1970). It was found that the discharge in a distributary is linearly related to the total discharge in Rapaälven, and that the main distributary system may, inter alia, be distinguished from the other systems by its: (1) higher rate of increase in discharge with total discharge; (2) decreasing proportion of the total discharge as this increases. Threshold discharges, i.e. the total water discharge in Rapaälven below which a channel has zero discharge, were determined for the “secondary” distributaries. The temporal variation in flow distribution is indicated by, for example, changes in the rate of deltaic advance at different mouths and aggradation of channel beds within distributary systems that have experienced reduced flows. It is concluded that the flow distribution is an important factor to be considered in studies of river deltas. The delta is growing by about 0.38 km2/year, equivalent to an advance of the delta front by approx. 4.5 m/year. Disintegration of vegetation is abundant all over the delta except for the distal parts. However, the proportion of delta lake area has decreased and the proportion of vegetated area has ... Doctoral or Postdoctoral Thesis Lappland Uppsala University: Publications (DiVA) Laitaure ENVELOPE(18.283,18.283,67.133,67.133) Lappland ENVELOPE(18.067,18.067,65.900,65.900) Rapaälven ENVELOPE(18.213,18.213,67.149,67.149) Sarek ENVELOPE(17.500,17.500,67.350,67.350) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Recent delta formation hydraulic geometry distributary forms and processes X-ray radiography Sarek Lappland Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Recent delta formation hydraulic geometry distributary forms and processes X-ray radiography Sarek Lappland Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Andrén, Hans Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes |
topic_facet |
Recent delta formation hydraulic geometry distributary forms and processes X-ray radiography Sarek Lappland Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
Deltaic processes were studied on the Laitaure delta. Specific aims were to: analyse forms and processes in distributaries with regard to hydraulic geometry relationships; investigate the distribution of water into different distributaries; analyse the morphological development of the delta; and quantify the advance of the delta front. Further, a brief study was made of the bottom sediments in Lake Laitaure. It was concluded that distributaries may be distinguished by at-a-station hydraulic geometry relationships, depending on their state of activity and their location in the delta, i.e. distance to the delta front. Differences in activity between distributaries were also shown by the “delta” (analogous to downstream) hydraulic geometry relationships. Large similarities in “delta” hydraulic geometry were found between the Laitaure delta and the Volga and Danube deltas (cf. Mikhailov, 1970). It was found that the discharge in a distributary is linearly related to the total discharge in Rapaälven, and that the main distributary system may, inter alia, be distinguished from the other systems by its: (1) higher rate of increase in discharge with total discharge; (2) decreasing proportion of the total discharge as this increases. Threshold discharges, i.e. the total water discharge in Rapaälven below which a channel has zero discharge, were determined for the “secondary” distributaries. The temporal variation in flow distribution is indicated by, for example, changes in the rate of deltaic advance at different mouths and aggradation of channel beds within distributary systems that have experienced reduced flows. It is concluded that the flow distribution is an important factor to be considered in studies of river deltas. The delta is growing by about 0.38 km2/year, equivalent to an advance of the delta front by approx. 4.5 m/year. Disintegration of vegetation is abundant all over the delta except for the distal parts. However, the proportion of delta lake area has decreased and the proportion of vegetated area has ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Andrén, Hans |
author_facet |
Andrén, Hans |
author_sort |
Andrén, Hans |
title |
Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes |
title_short |
Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes |
title_full |
Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes |
title_fullStr |
Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes |
title_full_unstemmed |
Development of the Laitaure Delta, Swedish Lappland : A Study of Growth, Distributary Forms and Processes |
title_sort |
development of the laitaure delta, swedish lappland : a study of growth, distributary forms and processes |
publisher |
Uppsala universitet, Institutionen för geovetenskap |
publishDate |
1994 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-352156 |
long_lat |
ENVELOPE(18.283,18.283,67.133,67.133) ENVELOPE(18.067,18.067,65.900,65.900) ENVELOPE(18.213,18.213,67.149,67.149) ENVELOPE(17.500,17.500,67.350,67.350) |
geographic |
Laitaure Lappland Rapaälven Sarek |
geographic_facet |
Laitaure Lappland Rapaälven Sarek |
genre |
Lappland |
genre_facet |
Lappland |
op_relation |
UNGI rapport, 0375-8109 88 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-352156 urn:isbn:91-506-1068-6 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766062112581353472 |