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Article

A Conflict between Traditional Flood Measures and Maintaining River Ecosystems? A Case Study Based upon the River Lærdal, Norway

1
Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, 7031 Trondheim, Norway
2
The Norwegian Water Resources and Energy Directorate, 0301 Oslo, Norway
3
Department of Natural Sciences and Environmental Health, The University of South East Norway, 3800 Bø, Norway
4
SINTEF Energy Research, 7034 Trondheim, Norway
5
Multiconsult, Ashford TN23 1HU, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Chang Huang
Water 2021, 13(14), 1884; https://doi.org/10.3390/w13141884
Received: 28 May 2021 / Revised: 24 June 2021 / Accepted: 25 June 2021 / Published: 7 July 2021
(This article belongs to the Section Hydrology)
Floods are among the most damaging of natural disasters, and flood events are expected to increase in magnitude and frequency with the effects of climate change and changes in land use. As a consequence, much focus has been placed on the engineering of structural flood mitigation measures in rivers. Traditional flood protection measures, such as levees and dredging of the river channel, threaten floodplains and river ecosystems, but during the last decade, sustainable reconciliation of freshwater ecosystems has increased. However, we still find many areas where these traditional measures are proposed, and it is challenging to find tools for evaluation of different measures and quantification of the possible impacts. In this paper, we focus on the river Lærdal in Norway to (i) present the dilemma between traditional flood measures and maintaining river ecosystems and (ii) quantify the efficiency and impact of different solutions based on 2D hydraulic models, remote sensing data, economics, and landscape metrics. Our results show that flood measures may be in serious conflict with environmental protection and legislation to preserve biodiversity and key nature types. View Full-Text
Keywords: river; ecosystem; flood; protection; EIA; HEC-RAS; hydraulic modeling; dredging; mitigation; management; impact; fish; wall confinements; floodplains river; ecosystem; flood; protection; EIA; HEC-RAS; hydraulic modeling; dredging; mitigation; management; impact; fish; wall confinements; floodplains
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MDPI and ACS Style

Juárez, A.; Alfredsen, K.; Stickler, M.; Adeva-Bustos, A.; Suárez, R.; Seguín-García, S.; Hansen, B. A Conflict between Traditional Flood Measures and Maintaining River Ecosystems? A Case Study Based upon the River Lærdal, Norway. Water 2021, 13, 1884. https://doi.org/10.3390/w13141884

AMA Style

Juárez A, Alfredsen K, Stickler M, Adeva-Bustos A, Suárez R, Seguín-García S, Hansen B. A Conflict between Traditional Flood Measures and Maintaining River Ecosystems? A Case Study Based upon the River Lærdal, Norway. Water. 2021; 13(14):1884. https://doi.org/10.3390/w13141884

Chicago/Turabian Style

Juárez, Ana, Knut Alfredsen, Morten Stickler, Ana Adeva-Bustos, Rodrigo Suárez, Sonia Seguín-García, and Bendik Hansen. 2021. "A Conflict between Traditional Flood Measures and Maintaining River Ecosystems? A Case Study Based upon the River Lærdal, Norway" Water 13, no. 14: 1884. https://doi.org/10.3390/w13141884

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