Identifying failure mechanisms of native riparian forest regeneration in a variable-width floodplain using a spatially-distributed riparian forest recruitment model

Tranmer, Andrew W.; Benjankar, Rohan; Vidergar, Dmitri; Tonina, Daniele

doi:10.1016/j.ecoleng.2022.106865

Cited by 3 publications

(2 citation statements)

References 86 publications

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“…Recruitment models Mahoney and Rood (1998), Douhovnikoff et al (2005), Dixon and Turner (2006), Burke et al (2009), Balke et al (2011Balke et al ( , 2014, Benjankar et al (2014Benjankar et al ( , 2020, Asaeda et al (2015), Morrison and Stone (2015), Caponi et al (2019), Gilbert & Wilcox (2021), Tranmer et al (2023, Serlet et al (2024).…”

Section: Vegetation Colonizationmentioning

confidence: 99%

Plants and river morphodynamics: The emergence of fluvial biogeomorphology

Gurnell,

Bertoldi

2024

River Research & Apps

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In this article, we track the evolution of fluvial biogeomorphology from the middle of the 20th century to the present. We consider the emergence of fluvial biogeomorphology as an interdisciplinary research area that integrates knowledge drawn primarily from fluvial geomorphology and plant ecology, but with inputs from hydrology and landscape ecology. We start by assembling evidence for the emergence of the field of fluvial biogeomorphology with a keyword search of the Web of Science and a detailed analysis of papers published in two scientific journals: a geomorphology journal—Earth Surface Processes and Landforms; a multidisciplinary river science journal—River Research and Applications. Based on this evidence, we identify three distinct time periods in the development of fluvial biogeomorphology: the ‘early years’ before 1990; the transitional decade of the 1990s; and the period of rapid expansion and diversification in themes, methods and investigation scales since 2000. Because the literature is vast, we can only summarize developments in each of these time periods, but we refer to recent in‐depth reviews and conceptual perspectives on relevant topics. Thus, rather than a full and deep review, we present an annotated bibliographic overview of the development of fluvial biogeomorphology, whereby the text describes broad trends but is supported by tables of citations that can deliver greater detail. We end with a brief consideration of likely future developments.

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Section: Vegetation Colonizationmentioning

confidence: 99%

Plants and river morphodynamics: The emergence of fluvial biogeomorphology

Gurnell,

Bertoldi

2024

River Research & Apps

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“…Pioneer riparian plants often colonize bare sediments in floodplains, deltas, ephemeral channels, and fluvial bars as discrete vegetation patches (e.g., Benjankar et al., 2020; Caponi et al., 2019; Mahoney & Rood, 1998). In fluvial and deltaic systems, depositional, and erosional processes in and around vegetation patches provide a spatial gradient of geomorphic disturbances and habitat mosaics that support biodiversity and ecosystem function for both aquatic and riparian species (e.g., Gurnell, 2014; Taylor et al., 2019; Tranmer, Benjankar, et al., 2023; Tranmer, Ji, & Ahn, 2023; Volke et al., 2015). For example, scour in patch‐adjacent channels and deposition downstream of vegetation patches provide a combination of physical riverine conditions that are ideal habitats for the life history of Pacific lamprey (Stone & Barndt, 2005; USFWS, 2019).…”

Section: Introductionmentioning

confidence: 99%

Characterizing Erosion and Deposition in and Around Riparian Vegetation Patches: Complex Flow Hydraulics, Sediment Supply, and Morphodynamic Feedbacks

Tranmer,

Ji,

Ahn

et al. 2024

Water Resources Research

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Riparian vegetation plays a fundamental role in alluvial channel evolution by modifying flow and sedimentation dynamics. To elucidate the roles of sediment supply, flow‐dependent transport capacity, and morphodynamic feedbacks on the evolution of emergent vegetation patches over a single hydrograph, we conducted two experiments with different reach‐scale sediment supplies: a high‐supply experiment (HSE) and low‐supply experiment (LSE). We measured flow velocities, bedload transport, and topographic changes around a full‐scale patch of live emergent willows in an outdoor laboratory flume. Erosion occurred in the patch‐adjacent channel areas irrespective of the sediment supply, whereas deposition within the patch interior was suppressed in the LSE and enhanced in the HSE. The magnitude of patch deposition in each experiment was controlled by the local sediment supply to the patch and local sediment mobility during each discharge in the hydrograph. The local sediment supply was affected by bed morphodynamics at the patch head, which modulated the reach‐scale sediment supply by redistributing the bedload in the channel. Sediment mobility within the patch was flow‐dependent and a function of velocity and turbulent kinetic energy. For different discharges, the velocity in the patch changed proportionally with the freestream velocity; however, the turbulent kinetic energy was more sensitive, being elevated compared with the freestream during high flows and inhibited at low flows. Therefore, deposition and erosion within vegetation patches are not simply functions of the reach‐scale sediment supply or patch flow characteristics, as is often assumed, but additionally depend on the local sediment supply to the patch interior.

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Critical linkages among floodplain hydrology, geomorphology and ecology along a lowland meandering river, Illinois, USA

Shukla,

Salas,

Pankau

et al. 2024

Ecohydrology

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The ecology of forested floodplains is intricately linked to river hydrology through the frequency, magnitude, timing and duration of floodplain inundation. Spatial variability in inundation characteristics is influenced by the geomorphic template of a floodplain, both in terms of the topography of floodplain features and connectivity of these features to the main river channel. Spatial variability in inundation, in turn, has the potential to produce spatial variability in forest ecological characteristics. This study examines the influence of floodplain geomorphic features on spatial variability in inundation frequency as well as the relationship between these geomorphic features and the ecological characteristics of a floodplain forest. The frequencies of floods of different magnitudes are determined from flow‐duration analysis of over 100 years of discharge data for a lowland meandering river in Illinois, USA. Data on discharge, stage, and topography are then used to calibrate a two‐dimensional hydraulic model of flow across the floodplain at different levels of inundation. Integrating the frequency and inundation data yields mapping of average annual inundation frequency for different parts of the floodplain. Significant differences in inundation frequency correspond to three distinct floodplain geomorphic features: secondary channels (frequency = 12%), closed depressions (frequency = 4%) and the floodplain surface (frequency = %). Tree density is similar among the three types of geomorphic features, but tree species composition and canopy density differ significantly between secondary channels and the floodplain surface. The results provide insight into linkages among hydrology, geomorphology and tree characteristics of forested floodplains of lowland meandering rivers.

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Identifying failure mechanisms of native riparian forest regeneration in a variable-width floodplain using a spatially-distributed riparian forest recruitment model

Cited by 3 publications

References 86 publications

Plants and river morphodynamics: The emergence of fluvial biogeomorphology

Plants and river morphodynamics: The emergence of fluvial biogeomorphology

Characterizing Erosion and Deposition in and Around Riparian Vegetation Patches: Complex Flow Hydraulics, Sediment Supply, and Morphodynamic Feedbacks

Critical linkages among floodplain hydrology, geomorphology and ecology along a lowland meandering river, Illinois, USA

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