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Sökning: WFRF:(Brandt S. Anders 1970 )

  • Resultat 11-20 av 51
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11.
  • Brandt, S. Anders, 1970- (författare)
  • Conceptualization of hydraulic and sedimentary processes in downstream reaches during flushing of reservoirs
  • 2005
  • Ingår i: Proceedings of the XXXI IAHR Congress [Elektronisk resurs]. - Seoul : Korea Water Resources Association. - 8987898237 ; , s. 2577-2588
  • Konferensbidrag (refereegranskat)abstract
    • The main focus of this paper is to describe the active hydraulic and sedimentary processes in downstream river reaches during flushing of sediments from reservoirs. During flushing extreme amounts of sediment may be released. Therefore, these processes are different than those downstream from dams and reservoirs not subjected to flushing. Hence, also the effects differ, which knowledge of may be of value for biologists, etc. During flushing of a reservoir a wave will be released to the downstream reaches. This wave can be divided into one water part and one sediment part. Initially they are in phase with each other, but with increased distance downstream from the dam, the transported sediment lags behind the water due to different traveling velocities. The paper treats when and where sedimentation occurs, and how this is related to the different traveling velocities of water and sediment. Also included are discussions on how the downstream effects during flushing differ from non-flushing effects, how visualization of effects can enhance both the analysis and communication with planners, politicians, etc., as well as discussions on how the studies of these effects can benefit from improved field-work methods.
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14.
  • Brandt, S. Anders, 1970-, et al. (författare)
  • Harmonization of GI educations in Sweden and the Bologna process : viewpoints of University of Gävle
  • 2006
  • Ingår i: Fifth European GIS Education Seminar (EUGISES 2006). ; , s. 10-
  • Konferensbidrag (refereegranskat)abstract
    • With the implementation of the Bologna declaration, many study programmes and course curricula needs to be updated and revised. This paper describes the current situation in Sweden regarding GIT educations and courses and whether a harmonization is needed. A survey was made to see which GIT courses that are given and at which level they are given at the various universities. For some universities, interviews were conducted about their courses’ contents and their strategies for determining course levels. Discussions were also made about harmonization of courses between Swedish universities. Some problems due to lack of harmonization was noted, which probably will be more severe in the future due to increased student mobility. To harmonize courses, Bloom’s revised taxonomy is put forward as a tool which is used to clearly state the level of the course in relation to learning objectives.
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15.
  • Brandt, S. Anders, 1970-, et al. (författare)
  • Importance of river bank and floodplain slopes on the accuracy of flood inundation mapping
  • 2012
  • Ingår i: River Flow 2012. - Leiden, The Netherlands : CRC Press / Balkema (Taylor & Francis). - 9780415621298 - 9780203076354 - 9781466575523 ; , s. 1015-1020
  • Konferensbidrag (refereegranskat)abstract
    • Effective flood assessment and management depend on accurate models of flood events, which in turn are strongly affected by the quality of digital elevation models (DEMs). In this study, HEC-RAS was used to route one specificwater discharge through the main channel of the Eskilstuna River, Sweden. DEMs with various resolutions and accuracies were used to model the inundation. The results showed a strong positive relationship between the quality of theDEMand the extent of the inundation. However, evenDEMswith the highest resolution produced inaccuracies. In another case study, the Testebo River, the model settings could be calibrated, thanks to a surveyed old inundation event. However, even with the calibration efforts, the resulting inundation extents showed varying degrees of deviation from the surveyed flood boundaries. Therefore, it becomes clear that not only does the resolution of the DEM impact the quality of the results; also, the floodplain slope perpendicular to the river flow will impact the modelling accuracy. Flatter areas exhibited the greatest predictive uncertainties regardless of the DEM’s resolution. For perfectly flat areas, uncertainty becomes infinite.
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16.
  • Brandt, S. Anders, 1970-, et al. (författare)
  • Mapping Flood Risk Uncertainty Zones in Support of Urban Resilience Planning
  • 2021
  • Ingår i: Urban Planning. - Lisbon, Portugal : Cogitatio. - 2183-7635. ; 6:3, s. 258-271
  • Tidskriftsartikel (refereegranskat)abstract
    • River flooding and urbanization are processes of different character that take place worldwide. As the latter tends to make the consequences of the former worse, together with the uncertainties related to future climate change and flood‐risk modeling, there is a need to both use existing tools and develop new ones that help the management and planning of urban environments. In this article a prototype tool, based on estimated maximum land cover roughness variation, the slope of the ground, and the quality of the used digital elevation models, and that can produce flood ‘uncertainty zones’ of varying width around modeled flood boundaries, is presented. The concept of uncertainty, which urban planners often fail to consider in the spatial planning process, changes from something very difficult into an advantage in this way. Not only may these uncertainties be easier to understand by the urban planners, but the uncertainties may also function as a communication tool between the planners and other stakeholders. Because flood risk is something that urban planners always need to consider, these uncertainty zones can function both as buffer areas against floods, and as blue‐green designs of significant importance for a variety of ecosystem services. As the Earth is warming and the world is urbanizing at rates and scales unprecedented in history, we believe that new tools for urban resilience planning are not only urgently needed, but also will have a positive impact on urban planning.
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17.
  • Brandt, S. Anders, 1970- (författare)
  • Modeling and visualizing uncertainties of flood boundary delineation : algorithm for slope and DEM resolution dependencies of 1D hydraulic models
  • 2016
  • Ingår i: Stochastic environmental research and risk assessment (Print). - : Springer. - 1436-3240 .- 1436-3259. ; 30:6, s. 1677-1690
  • Tidskriftsartikel (refereegranskat)abstract
    • As flood inundation risk maps have become a central piece of information for both urban and risk management planning, also a need to assess the accuracies and uncertainties of these maps has emerged. Most maps show the inundation boundaries as crisp lines on visually appealing maps, whereby many planners and decision makers, among others, automatically believe the boundaries are both accurate and reliable. However, as this study shows, probably all such maps, even those that are based on high-resolution digital elevation models (DEMs), have immanent uncertainties which can be directly related to both DEM resolution and the steepness of terrain slopes perpendicular to the river flow direction. Based on a number of degenerated DEMs, covering areas along the Eskilstuna River, Sweden, these uncertainties have been quantified into an empirically-derived disparity distance equation, yielding values of distance between true and modeled inundation boundary location. Using the inundation polygon, the DEM, a value representing the DEM resolution, and the desired level of confidence as inputs in a new-developed algorithm that utilizes the disparity distance equation, the slope and DEM dependent uncertainties can be directly visualized on a map. The implications of this strategy should benefit planning and help reduce high costs of floods where infrastructure, etc., have been placed in flood-prone areas without enough consideration of map uncertainties.
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18.
  • Brandt, S. Anders, 1970- (författare)
  • Okunskap får städer att svämma över
  • 2022
  • Ingår i: Forskning & framsteg. - Stockholm : Stiftelsen Forskning & Framsteg. - 0015-7937. ; :2, s. 38-39
  • Tidskriftsartikel (populärvet., debatt m.m.)abstract
    • Ett varmare klimat innebär kraftigare skyfall och fler översvämningar. Men många kommuner är dåliga på att avgöra var risken för höga vattenflöden gör det olämpligt att bygga. Det menar naturgeografen Anders Brandt – som vill se ett kunskapslyft i geografi.
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19.
  • Brandt, S. Anders, 1970- (författare)
  • Rapport från Utbildningssektionens årliga utbildningskonferens
  • 2009
  • Ingår i: Kart- & bildteknik. - Gävle : Kartografiska Sällskapet. - 1651-792X. ; 2009:3, s. 18-19
  • Tidskriftsartikel (populärvet., debatt m.m.)abstract
    • Kartografiska sällskapets utbildningssektion genomför varje år de så kallade lärardagarna, en utbildningskonferens som kretsar kring geografisk information. Tilltänkta deltagare är alla, både utbildare och avnämare, som har intresse av utbildningsfrågor från skol- till universitetsnivå. Den 17 till 18 augusti detta år stod KTH som värd, med Hans Hauska hållande taktpinnen, och med 19 deltagare från ett tiotal olika arbetsgivare.
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20.
  • Brandt, S. Anders, 1970- (författare)
  • Resolution issues of elevation data during inundation modeling of river floods
  • 2005
  • Ingår i: Proceedings of the XXXI IAHR Congress [Elektronisk resurs]. - Seoul : Korea Water Resources Association. - 8987898237 ; , s. 3573-3581
  • Konferensbidrag (refereegranskat)abstract
    • A case study of the Eskilstuna River in Sweden is presented. This study is carried out within the project KRIS-GIS®, a Swedish initiative of handling crisis situations, including flooding. The purpose is to show how different resolutions in input elevation data affect the resulting inundation maps. Terrain elevation points at the sides of the river were gathered from an airborne laser altimetry survey, and river bed elevations were gathered from an echosounding survey. The terrain model was constructed in ArcView GIS as a triangulated irregular network (TIN), which served as the base for all later modeling. The hydraulic modeling was done as one-dimensional steady flow in HEC-RAS flow routing software. High-resolution elevation data resulted in better inundation delineation than did lowresolution elevation data. If the mean water discharge was used in the modeling and if the river is narrow, a low resolution could even lead to that the river itself would not be marked as inundated. At high water discharges, the river was usually inundated, but there was great uncertainty if the riparian areas really would be flooded or not. With steep side slopes, the delineation of inundation becomes more certain, while at gentler side slopes, the flow is distributed on a larger surface with a risk that the raster cells will be incorrectly marked regarding inundation. Finally, the use of high-resolution elevation data compared with lowresolution data, makes estimates of friction factor, Manning’s n, relatively more important for correct results in inundation studies.
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