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Quantifying the hydrological impact of simulated changes in land use on peak discharge in a small catchment
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
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2014 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 466-467, 741-754 p.Article in journal (Refereed) Published
Abstract [en]

A physically-based, distributed hydrological model (MIKE SHE) was used to quantify overland runoff in response to four extreme rain events and four types of simulated land use measure in a catchment in Norway. The current land use in the catchment comprises arable lands, forest, urban areas and a stream that passes under a motorway at the catchment outlet. This model simulation study demonstrates how the composition and configuration of land use measures affect discharge at the catchment outlet differently in response to storms of different sizes. For example, clear-cutting on 30% of the catchment area produced a 60% increase in peak discharge and a 10% increase in total runoff resulting from a 50-year storm event in summer, but the effects on peak discharge were less pronounced during smaller storms. Reforestation of 60% of the catchment area was the most effective measure in reducing peak flows for smaller (2-, 5- and 10-year) storms. Introducing grassed waterways reduced water velocity in the stream and resulted in a 28% reduction in peak flow at the catchment outlet for the 50-year storm event. Overall, the results indicate that the specific effect of land use measures on catchment discharge depends on their spatial distribution and on the size and timing of storm events.

Place, publisher, year, edition, pages
2014. Vol. 466-467, 741-754 p.
Keyword [en]
Extreme rainfall-runoff events, Hydrological model, Land use change, Road infrastructure, Runoff
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-140635DOI: 10.1016/j.scitotenv.2013.07.047ISI: 000330491600079Scopus ID: 2-s2.0-84882941606OAI: oai:DiVA.org:kth-140635DiVA: diva2:692115
Note

QC 20140130

Available from: 2014-01-30 Created: 2014-01-30 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Road structures under climate and land use change: Bridging the gap between science and application
Open this publication in new window or tab >>Road structures under climate and land use change: Bridging the gap between science and application
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Future changes in climate and land use are likely to affect catchment hydrological responses and consequently influence the amount of runoff reaching roads. Blockages and damage to under-dimensioned infrastructure can be extremely costly for the regions affected. This study aims to produce scientifically well-founded suggestions on adaptation of road drainage systems to climate changes resulting in more frequent floods. This thesis demonstrates the need to integrate aspects of climate change and land use impacts into the planning and practice of road construction and maintenance in Sweden. Tools such as hydrological models are needed to assess impacts on discharge dynamics. Identifying a ‘best’ practically performing hydrological model is often difficult due to the potential influence of modeller subjectivity on calibration procedure, parameter selection, etc. Hydrological models may need to be selected on a case-by-case basis and have their performance evaluated on an application-by-application basis.

The work presented here began by examining current practice for road drainage systems in Sweden. 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. Overall, the results indicate that the specific effect of land use measures on catchment discharge depend on their spatial distribution and on the size and timing of storm events. Scenarios comprising a changing climate up to 2050 or to 2100 and forest clear-cutting were used to determine whether the current design of road drainage construction is sufficient for future conditions. Based on the findings, the approach developed can be used for similar studies, e.g. by the Swedish Transport Administration in dimensioning future road drainage structures to provide safe and robust infrastructure.

Furthermore, a statistical method was developed for estimating and mapping flood hazard probability along roads using road and catchment characteristics. The method allows flood hazards to be estimated and provides insight into the relative roles of landscape characteristics in determining road-related flood hazards. Overall, this method provides an efficient way to estimate flooding hazards and to inform the planning of future roadways and the maintenance of existing roadways.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xii, 31 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2014:01
Keyword
Adaptation, extreme rainfall events, runoff, land use, climate change, flood hazard
National Category
Social Sciences
Research subject
SRA - Transport; Järnvägsgruppen - Infrastruktur
Identifiers
urn:nbn:se:kth:diva-140631 (URN)978-91-7595-000-6 (ISBN)
Public defence
2014-02-14, Sal V1, Teknikringen 76, 1 tr., KTH, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20140130

Available from: 2014-01-30 Created: 2014-01-29 Last updated: 2015-01-16Bibliographically approved

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