Publication

Above and below-ground Salix dynamics in response to river processes

Paolo Perona
2014
Journal Articles

Résumé

Riparian vegetation influences hydraulic and morphodynamic river processes and may contribute to sediment stabilization. In turn, vegetation recruitment and growth on non-cohesive fluvial deposits strongly depends on river hydrology and the ability of roots to develop and to anchor efficiently to resist flow erosion. In this paper, we examine the above-ground and the below-ground seasonal growth dynamics of Salix cuttings in relation to local river hydrodynamics and morphodynamics, on the basis of a detailed and unique data set. During the two season-long campaigns in 2009 and 2010, 1188 and 1152 cuttings, respectively, were organized in square plots and planted on a gravel island of the restored reach of the River Thur (Neunforn, Thurgau, Switzerland). Each year, all cuttings were monitored almost regularly from the beginning until the end of the growing season (April-September). Root development statistics were also obtained from high-resolution scanner analysis of carefully uprooted samples from selected plots. Our results show how cutting survival and the nature and strength of correlations between island topography and cutting growth statistics depend on river hydrology. An empirical functional form that links root development based on the measured main stem length is then proposed for predictive purposes. Cutting mortality following flood events is shown to depend nonlinearly on both erosion and deposition processes, whereas it appears more linearly related to the magnitude of the bed shear stress distribution generated by the maximum seasonal flood. This analysis allows an identification of an important threshold for plant survival within different erosion and deposition regimes, which explains the spatial and temporal distribution of the surviving cuttings within the plots. These results have practical implications, for instance, for evaluating, planning and managing the use of riparian trees in restoration projects. Copyright (c) 2013 John Wiley & Sons, Ltd.

Source officielle

https://infoscience.epfl.ch/entities/publication/0c2bba5d-3915-4e4f-bc5f-8de2820c124d

Paolo Perona
2014
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/0c2bba5d-3915-4e4f-bc5f-8de2820c124d

Proximité ontologique

Sciences de la Terre

Géographie physique: Géomorphologie

Concepts associés (32)

Inondation

Une inondation est une submersion temporaire, naturelle ou artificielle, d'un espace par de l'eau liquide. Ce terme est fréquemment utilisé pour décrire : le débordement d'un cours d'eau, en crue puis en décrue, sur les terrains voisins ; l'eau est répandue dans les talwegs et les dépressions topographiques ; le ruissellement très important d'origine pluviale, soit sur des terres cultivées (inondation boueuse), soit en zone imperméable urbanisée ; le débordement ou les conséquences de la rupture d'ouvrages artificiels hydrauliques tels que retenues d'eau, digues, canalisations (agricoles, d'eau potable, d'assainissement) ou la rupture d'une retenue naturelle comme celle d'un lac glaciaire, provoquant une inondation soudaine ; la remontée émergente d'une nappe phréatique ; l'envahissement temporaire par la mer d'une zone côtière lors d'une submersion marine ou d'un tsunami.

Riparian-zone restoration

Riparian-zone restoration is the ecological restoration of riparian-zone habitats of streams, rivers, springs, lakes, floodplains, and other hydrologic ecologies. A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the fifteen terrestrial biomes of the earth; the habitats of plant and animal communities along the margins and river banks are called riparian vegetation, characterized by aquatic plants and animals that favor them.

Fluvial processes

In geography and geology, fluvial processes are associated with rivers and streams and the deposits and landforms created by them. When the stream or rivers are associated with glaciers, ice sheets, or ice caps, the term glaciofluvial or fluvioglacial is used. Fluvial processes include the motion of sediment and erosion or deposition on the river bed. The movement of water across the stream bed exerts a shear stress directly onto the bed.

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