Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars
Throughout the 20th century, many rivers worldwide have undergone important riparian vegetation encroachment, which can be problematic in terms of flood risks and biodiversity. Nowadays, controlled floods is often considered as a management option in anthropized rivers, with the aim of limiting vege...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2018-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://doi.org/10.1051/e3sconf/20184002025 |
| _version_ | 1818968124740861952 |
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| author | Jourdain Camille Claude Nicolas Antoine Germain Tassi Pablo Cordier Florian |
| author_facet | Jourdain Camille Claude Nicolas Antoine Germain Tassi Pablo Cordier Florian |
| author_sort | Jourdain Camille |
| collection | DOAJ |
| description | Throughout the 20th century, many rivers worldwide have undergone important riparian vegetation encroachment, which can be problematic in terms of flood risks and biodiversity. Nowadays, controlled floods is often considered as a management option in anthropized rivers, with the aim of limiting vegetation encroachment within river channels, as well as maintaining a diverse habitat by reactivating natural channel dynamics. In this context, this study aims at investigating the influence of different flood regimes on river bar vegetation development and dynamics, focussing on alternate bar systems which are typically found in embanked streams. This question has been addressed through two-dimensional bio-morphodynamic modeling of a simplified gravel bed river reach. Four hydrological scenarios with different flood peak discharges have been run for 50 years. For all scenarios, a steady increase in vegetation cover strongly impacts the evolution of bar morphology, until a relatively stable equilibrium is reached after one to three decades. Numerical results suggest that vegetation development on bars is associated to an increase in bar wavelength and a decrease in bar width. Higher peak flood discharges lead to narrower and longer bars, and a longer adjustment duration. When vegetation cover is fully developed, interannual flood variability seems crucial to maintain bedform and vegetation turnover. |
| first_indexed | 2024-12-20T13:59:42Z |
| format | Article |
| id | doaj.art-bf2ceb7237464bacb2251447630cd4b0 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-20T13:59:42Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-bf2ceb7237464bacb2251447630cd4b02022-12-21T19:38:24ZengEDP SciencesE3S Web of Conferences2267-12422018-01-01400202510.1051/e3sconf/20184002025e3sconf_riverflow2018_02025Influence of flood regime on riparian vegetation dynamics in rivers with alternate barsJourdain CamilleClaude NicolasAntoine GermainTassi PabloCordier FlorianThroughout the 20th century, many rivers worldwide have undergone important riparian vegetation encroachment, which can be problematic in terms of flood risks and biodiversity. Nowadays, controlled floods is often considered as a management option in anthropized rivers, with the aim of limiting vegetation encroachment within river channels, as well as maintaining a diverse habitat by reactivating natural channel dynamics. In this context, this study aims at investigating the influence of different flood regimes on river bar vegetation development and dynamics, focussing on alternate bar systems which are typically found in embanked streams. This question has been addressed through two-dimensional bio-morphodynamic modeling of a simplified gravel bed river reach. Four hydrological scenarios with different flood peak discharges have been run for 50 years. For all scenarios, a steady increase in vegetation cover strongly impacts the evolution of bar morphology, until a relatively stable equilibrium is reached after one to three decades. Numerical results suggest that vegetation development on bars is associated to an increase in bar wavelength and a decrease in bar width. Higher peak flood discharges lead to narrower and longer bars, and a longer adjustment duration. When vegetation cover is fully developed, interannual flood variability seems crucial to maintain bedform and vegetation turnover.https://doi.org/10.1051/e3sconf/20184002025 |
| spellingShingle | Jourdain Camille Claude Nicolas Antoine Germain Tassi Pablo Cordier Florian Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars E3S Web of Conferences |
| title | Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars |
| title_full | Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars |
| title_fullStr | Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars |
| title_full_unstemmed | Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars |
| title_short | Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars |
| title_sort | influence of flood regime on riparian vegetation dynamics in rivers with alternate bars |
| url | https://doi.org/10.1051/e3sconf/20184002025 |
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