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Usefulness of four hydrological models in simulating high-resolution discharge dynamics of a adjacent to a road
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Environmental Management and Assessment. (Miljöbedömning och -förvaltning och Biogeofysik)
KTH, School of Architecture and the Built Environment (ABE).
Norwegian Insitute for Agricultural and Environmental Research, Bioforsk, Soil and Environement division, Ås, Norway.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Environmental Management and Assessment. (Miljöbedömning och -förvaltning och Biogeofysik)
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Four hydrological models (LISEM, MIKE SHE, CoupModel and HBV) were compared with respect to their capability to predict peak flow in a small catchment upstream of a road in SE Norway on an hourly basis. All four models were calibrated using hourly observed streamflow. Simulated and observed discharge generated during three types of hydrological situations characteristic of winter/spring conditions causing overland flow were considered: snowmelt, partially frozen soil and heavy rain events. Using parameter sets optimised for winter/spring conditions, flows simulated by HBV coupled with CoupModel were comparable to measured discharge from the catchment in corresponding periods. However, this combination was best when all the parameters were calibrated in HBV. For ungauged basins with no real-time monitoring of discharge and when the spatial distribution is important, MIKE SHE may be more suitable than the other models, but the lack of detailed input data and the uncertainty in physical parameters should be considered. LISEM is potentially capable of calculating runoff from small catchments during winter/spring but requires better description of snowmelt, infiltration into frozen layers and tile drainage. From a practical road maintenance perspective, the usefulness and accuracy of a model depends on its ability to represent site-specific processes, data availability and calibration requirements.  

Keyword [en]
extreme events, road infrastructure, hydrological model, runoff
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:kth:diva-51586OAI: oai:DiVA.org:kth-51586DiVA: diva2:464786
Note

QC 20160912

Available from: 2011-12-14 Created: 2011-12-14 Last updated: 2016-09-12Bibliographically approved
In thesis
1. Adaptation of road drainage structures to climate change
Open this publication in new window or tab >>Adaptation of road drainage structures to climate change
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Climate change is expected to lead to more frequent extreme precipitation events, floods and changes in frost/thawing cycles. The frequency of road closures and other incidents such as flooding, landslides and roads being washed away will probably increase. Stronger demands will be placed on the function of road drainage systems.

The overall aim of this thesis was to produce scientifically well-founded suggestions on adaptation of road drainage systems to climate change involving more frequent floods. The work began by examining current practice for road drainage systems in Sweden and gathering experience from professionals working with various problems concerning surface and subsurface drainage systems. Various hydrological models were then used to calculate the runoff from a catchment adjacent to a road and estimate changes in peak discharge and total runoff resulting from simulated land use measures. According to these survey and hydrological modelling studies, adaptation of road drainage systems to climate change can be grouped into two categories: i) institutional adaptation; and ii) technical adaptation. The main approaches in institutional adaptation are to: i) raise the awareness of expected climate change and its impact on drainage systems in transport administration and relevant stakeholders; ii) include adaptation measures in the existing funding programme of the transport administration; and iii) develop an evaluation tool and action plans concerning existing road drainage systems. Technical adaptation will involve ensuring that road constructions are adapted to more frequent extreme precipitation events and responsive to changes in activities and land use in areas adjacent to roads.

Changes in climate variables will have effects on watershed hydrological responses and consequently influence the amount of runoff reaching roads. There is a great need for tools such as hydrological models to assess impacts on discharge dynamics, including peak flows. Improved communication between road managers and local actors in the forestry and agriculture sectors can be a means to reduce the impacts of, e.g., clear-cutting or badly managed farmland ditches.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. xvi, 29 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2061
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-90888 (URN)
Presentation
2011-12-19, V1, Teknikringen 76, Stockholm, 10:30
Opponent
Supervisors
Note
QC 20111214Available from: 2012-03-05 Created: 2012-03-02 Last updated: 2012-03-05Bibliographically approved

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