Removal of Riprap within Channelized Rivers: A Solution for the Restoration of Lateral Channel Dynamics and Bedload Replenishment?

Author:

Arfeuillère Anaïs1,Steiger Johannes1,Gautier Emmanuèle2,Petit Stéphane3,Roussel Erwan1ORCID,Vautier Franck4,Voldoire Olivier1,Saillard Julien5

Affiliation:

1. Université Clermont Auvergne, CNRS, GEOLAB, 63000 Clermont-Ferrand, France

2. Université Paris 1, CNRS, LGP, 94320 Thiais, France

3. VEODIS 3D, 63400 Chamalières, France

4. Université Clermont Auvergne, CNRS, MSH, 63000 Clermont-Ferrand, France

5. Conservatoire d’Espaces Naturels d’Auvergne, 63200 Mozac, France

Abstract

Riverbank erosion is an essential morphodynamic process for the improvement of river health and the ecohydrogeomorphological functioning of alluvial rivers. Lateral channel dynamics and sediment supply caused by bank erosion largely create and maintain heterogeneous in-channel habitats for fauna and aquatic or riparian plant species. However, humans very early started to stabilize riverbanks in order to favour navigation or to prevent valuable land and infrastructures close to the channel from eroding. During the 20th century, bank protection works such as riprap considerably increased and blocked lateral channel erosion, causing a loss of local sediment supply, which in turn resulted in a decrease in local bedload transport and channel incision. The aim of the article is to evaluate to what extent riprap removal may be an efficient restoration measure in terms of the reactivation of bank erosion and the replenishment of the local bedload in gravel-bed floodplain rivers with a sufficient amount of freedom space. An experimental in situ restoration approach was chosen. First, riprap was removed at two geomorphologically contrasting sites on the Allier River, France. Second, bank retreat was monitored, and the volumes eroded were quantified using photogrammetric and LiDAR surveys. Third, in the case of post-restoration bank erosion, grain size and morphological channel evolution analyses were carried out. Our results suggested that the removal of riprap is an effective measure for certain but not all channelized floodplain reaches. The geomorphological and sedimentary contexts are two criteria that should be considered when selecting sites for restoration. Thus, this study helps river managers to better target the criteria to be taken into account for the selection of sites with high potential for the restoration of lateral channel dynamics.

Funder

Auvergne-Rhône-Alpes Region

Agence de l’eau Loire-Bretagne

Établissement Public Loire

SAGE Allier Aval

University Clermont Auvergne CAP20-25

LTSER Zone Atelier Loire—CNRS

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

Reference76 articles.

1. Schumm, S.A. (1977). The Fluvial System, Wiley.

2. Amoros, C., and Petts, G.E. (1996). Fluvial Hydrosystems, Chapman & Hall.

3. Bank erosion as a desirable attribute of rivers;Florsheim;BioScience,2008

4. Petts, G.E., Möller, H., and Roux, A.L. (1989). Historical Change of Large Alluvial Rivers: Western Europe, J. Wiley & Sons.

5. Channel changes and floodplain management in the meandering middle Ebro River, Spain;Ollero;Geomorphology,2010

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3