Hydrology and Ecology of River Systems

Gurnell, Angela M.; Petts, Geoffrey E.

doi:10.1016/b978-0-444-53199-5.00037-3

Cited by 14 publications

(11 citation statements)

References 227 publications

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“…The presented method is focused on the spatial extent and temporal dynamics of FP connectivity, using overflow frequency and duration as proxies. These, combined with discharge magnitude, timing, and predictability, constitute the ecologically relevant flow parameters (Merritt et al ., ; Gurnell and Petts, ).…”

Section: Discussionmentioning

confidence: 97%

Multi-scale assessment of overflow-driven lateral connectivity in floodplain and backwater channels using LiDAR imagery

et al. 2014

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International audienceOverflow-driven lateral connectivity significantly influences the spatial distribution and diversity of floodplain habitats and biota. Proper understanding of lateral connectivity in floodplain and backwater channels is therefore critical for assessment of river quality and for targeting management or restoration actions. In this study, we present a methodological framework for spatial and temporal assessments of overflow-driven lateral connectivity at two spatial scales: bypass reach and backwater channel. Firstly, we compute the relative elevations, as well as overflow discharge, duration, and frequency using a simple, raster-based method that uses a LiDAR digital elevation model (DEM), rating curves, and streamflow time series. Subsequently, we analyse the accuracy of this approach with respect to the accuracy of a DEM and evaluate its further applications. Altogether, four 10-km-long bypass reaches and 11 backwater channels are analysed, located along the Rhone River corridor in France. The results proved the precision of the method to be affected by the LiDAR DEM accuracy, which was on average more precise in a typically homogeneous floodplain setting rather than for backwater channel plugs with pronounced topographic complexity and usually riparian forest canopy. Amongst the four studied reaches, Bregnier Cordon proved to have the greatest flooding dynamics, followed by Belley and Chautagne. The hydrological connectivity pattern of Pierre Benite differed significantly. Three longitudinal patterns of hydrological connectivity of backwater channels displayed stepwise advancement of the water. The presented results can be used to assess ecological potential of floodplain habitats and their historic and prospective evolution through time. Copyright (c) 2014 John Wiley & Sons, Ltd

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Section: Discussionmentioning

confidence: 97%

Multi-scale assessment of overflow-driven lateral connectivity in floodplain and backwater channels using LiDAR imagery

et al. 2014

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“…The mean annually discharge in case study hydrometric station is 9.3 m 3 sec −1 . The reach study of the Atrak River had been had a meandering channel plan form in accord with the definitions of (Leopold and Wolman, 1960;Simpson and Smith, 2001;Dury et al, 1972;Walling et al, 2011) and (Walling et al, 2011;Gurnell and Petts, 2011;Peters et al, 2011;Mulder, 2011;Karanis, 2011;Li et al, 2011).…”

Section: Studying Areamentioning

confidence: 94%

The Effect of Human Activities on River Bank Stability (Case Study)

Yamani¹

2011

American Journal of Environmental Sciences

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Problem statement: Investigation of interaction of human activities and rivers has become a important problem because they have essential role on rivers morphology. So, in this study Atrak River in North-East of Iran has been considered. Approach: The aim of this research was to determine human impact on the Atrak River morphology in the past and estimation of future outcomes. Results: We used MSS, Landsat and SPOT imageries, aerial photographs with conjunction fieldworks to determined banks erosion about 40 Km along Atrak River. Therefore, banks erosion rates are analyzed for 2 time periods : 1956-1967 and 1967-2000 respectively. Comparison results of five periods showed significant changes in land use around the Atrak River. River meanders were completely varied during the last 50 years within the study region. Also, the river plan gradually went out of meander shape and the river became straight in direction. The quantified average bank erosion rates were found to be slow, ranging from 0.36-3.5 m year −1 for the first and second analysis period, respectively. Conclusion/Recommendations: Based on this study, for changing and development of Atrak River bank must consider the flow volume, erodibility extent of the river banks, river material, conditions and variations of land cover near the river, organic material of soil and type of land.

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“…“Riparian zones are the interfaces between terrestrial and aquatic systems” (Gregory, Swanson, McKee, & Cummins, 1991), which we interpret to include the river channel bed and margins above the level of typical low flows and the active floodplain that is regularly inundated by the contemporary flow regime. These areas are morphologically complex and dynamic, responding and adapting to fluvial disturbances and supporting a mosaic of physical habitats (Naiman, Decamps, & McClain, 2005) from ponds and exposed bare sediments through sparse to heavily vegetated areas with widely varying sediment calibre and stratigraphy, groundwater regimes and susceptibility to inundation and drought (Gurnell & Petts, 2011). In these dynamic landscapes, the presence and survival of plants are defined by life history traits that support colonization and establishment under highly disturbed conditions (e.g., Bornette, Tabacchi, Hupp, Puijalon, & Rostan, 2008; Johnson, 2000; Mahoney & Rood, 1998; Polzin & Rood, 2006).…”

Section: Introductionmentioning

confidence: 99%

Physical engineering of an island‐braided river by two riparian tree species: Evidence from aerial images and airborne lidar

Bertoldi

Gurnell

2020

River Research & Apps

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Following a review of the European distribution, habitat requirements and life history characteristics of two riparian tree species, Alnus incana (L.) Moench (grey alder, a member of the Betulaceae family) and Populus nigra L. (black poplar, a member of the Salicaceae family), we explore their changing spatial distribution and topographic position within a 7 km, island braided reach of the Tagliamento River, Italy, where Populus nigra dominates the woody vegetation cover. Combining field observations and information extracted from aerial images, airborne lidar data and river flow time series for the period 1986–2017, we investigate (a) the changing spatial distribution of all (P. nigra‐dominated) woody vegetation and of A. incana alone; (b) whether river bed topography can be associated with these changing spatial distributions and (c) we consider whether A. incana displays any particular characteristics in its spatial and topographic distribution that may indicate that it is complementing the physical engineering role of P. nigra. We show that A. incana predominantly grows in lines along channel, island and floodplain edges, bordering wooded areas dominated by P. nigra and that areas supporting A. incana are associated with the topographic development of the river bed. We conclude that A. incana appears to be acting as a complementary physical engineer to P. nigra, suggesting that similar complementary physical engineering of river beds may be achieved by species with different life history traits to influence landform development in other river environments.

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Hydrology and Ecology of River Systems

Cited by 14 publications

References 227 publications

Multi-scale assessment of overflow-driven lateral connectivity in floodplain and backwater channels using LiDAR imagery

Multi-scale assessment of overflow-driven lateral connectivity in floodplain and backwater channels using LiDAR imagery

The Effect of Human Activities on River Bank Stability (Case Study)

Physical engineering of an island‐braided river by two riparian tree species: Evidence from aerial images and airborne lidar

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