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Modelling of sediment transport and deposition in reservoir Norðursjór, Iceland

Georgsdottir, Linda LU (2011) VVR820 20082
Division of Water Resources Engineering
Abstract
The objective of the study was to analyse the sediment load into the reservoir Norðursjór, which would form in the case of a dam construction in Vestari kvísl, an upstream part of the river Skaftá, in southern Iceland. The main part of the problem studied was to quantify the sediment transported into the reservoir Norðursjór and to model the bed elevation change of the reservoir as a result of this transport. Hydrologic and sediment data from sampling stations along the Skaftá river were used to make a hydrodynamic record and sediment rating curve employed as model input. The procedure followed to solve the main issues of the study was to make a geographic model of the reservoir using ArcGIS combined with HEC-GeoRAS mapping techniques by... (More)
The objective of the study was to analyse the sediment load into the reservoir Norðursjór, which would form in the case of a dam construction in Vestari kvísl, an upstream part of the river Skaftá, in southern Iceland. The main part of the problem studied was to quantify the sediment transported into the reservoir Norðursjór and to model the bed elevation change of the reservoir as a result of this transport. Hydrologic and sediment data from sampling stations along the Skaftá river were used to make a hydrodynamic record and sediment rating curve employed as model input. The procedure followed to solve the main issues of the study was to make a geographic model of the reservoir using ArcGIS combined with HEC-GeoRAS mapping techniques by extracting cross-sectional data from a digital elevation model of the reservoir area. The geographic model was imported into HEC-RAS where the sediment transport and hydraulic modelling was performed. Four different scenarios were studied with the results giving sediment deposition from 1.2 million tons per year up to 2.9 million tons per year. The rate of sedimentation in the reservoir showed that almost half of the storage capacity was lost after 20 years of regular flow not considering jökulhlaups. In a best case scenario the model suggests a life time of the reservoir of 40 ± 20 years, although the addition of frequent jökulhlaups would greatly shorten this estimation. (Less)
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author
Georgsdottir, Linda LU
supervisor
organization
course
VVR820 20082
year
type
H2 - Master's Degree (Two Years)
subject
report number
TVVR-11/5004
ISSN
1101-9824
language
English
id
2203094
date added to LUP
2011-11-10 16:29:26
date last changed
2011-11-10 16:29:26
@misc{2203094,
  abstract     = {The objective of the study was to analyse the sediment load into the reservoir Norðursjór, which would form in the case of a dam construction in Vestari kvísl, an upstream part of the river Skaftá, in southern Iceland. The main part of the problem studied was to quantify the sediment transported into the reservoir Norðursjór and to model the bed elevation change of the reservoir as a result of this transport. Hydrologic and sediment data from sampling stations along the Skaftá river were used to make a hydrodynamic record and sediment rating curve employed as model input. The procedure followed to solve the main issues of the study was to make a geographic model of the reservoir using ArcGIS combined with HEC-GeoRAS mapping techniques by extracting cross-sectional data from a digital elevation model of the reservoir area. The geographic model was imported into HEC-RAS where the sediment transport and hydraulic modelling was performed. Four different scenarios were studied with the results giving sediment deposition from 1.2 million tons per year up to 2.9 million tons per year. The rate of sedimentation in the reservoir showed that almost half of the storage capacity was lost after 20 years of regular flow not considering jökulhlaups. In a best case scenario the model suggests a life time of the reservoir of 40 ± 20 years, although the addition of frequent jökulhlaups would greatly shorten this estimation.},
  author       = {Georgsdottir, Linda},
  issn         = {1101-9824},
  language     = {eng},
  note         = {Student Paper},
  title        = {Modelling of sediment transport and deposition in reservoir Norðursjór, Iceland},
  year         = {2011},
}