Article
Geosciences, Multidisciplinary
E. Viparelli, E. C. Eke
Summary: The equilibrium geometry of single-thread rivers is determined by a flow resistance relation and a sediment transport relation for engineered rivers with fixed width. However, in self-formed channels where channel width is not fixed, an additional relation is needed. The new model presented in this study predicts equilibrium geometry based on the conservation of channel and floodplain material, showing comparable results with field observations. Mud load is found to have a strong control on channel patterns and bankfull geometry.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Dan Li, Yuan Xue, Chao Qin, Baosheng Wu, Bowei Chen, Ge Wang
Summary: Bankfull river discharge plays a crucial role in shaping river morphology and quantifying river size. However, the lack of accurate spatially distributed river network data has hindered regional studies in various fields such as stream ecology, hydrologic modeling, river carbon emissions, and geomorphology. In this study, using satellite imagery and hydrological data, the maximum river discharge and width of major rivers and their tributaries on the Qinghai-Tibet Plateau were calculated. A bankfull river width and surface area database was then established, providing valuable data for global hydrography datasets and representing fluvial geomorphology and geological background in the study area effectively.
Article
Environmental Sciences
Gary J. Brierley, Daniel Hikuroa, Ian C. Fuller, Jon Tunnicliffe, Kristiann Allen, James Brasington, Heide Friedrich, Jo Hoyle, Richard Measures
Summary: Contemporary management practices in Aotearoa New Zealand have constrained river systems to support land use, which undermines the functionality, biodiversity, and socio-cultural relations with rivers. The confinement of rivers can increase flood risk and limit adaptation to climate change. Despite aligning with Maori conceptualizations of rivers and Treaty of Waitangi obligations, space-to-move interventions have yet to be implemented.
WILEY INTERDISCIPLINARY REVIEWS-WATER
(2023)
Article
Environmental Sciences
John Shelley, Christopher Haring, Nathan Chrisman
Summary: This article documents four common failure modes observed during post-project site assessments on 12 streams in eastern Kansas, USA that took place in 2019 and 2020. These modes are bed degradation with structure perching, failure in flexion, loose cables, and lack of sediment infilling. It also suggests that failure in flexion is an important failure mechanism that should be considered and mitigated during design of cedar tree revetments. The authors hypothesize that progressive processes such as breaking of bankside branches may cause loose cables and cyclical loading and wetting/drying may lower the bending strength of the trees over time. Avoiding degrading streams, additional anchoring, and trimming the bank-side branches of the cedar trees are suggested as means to reduce these types of failures.
RIVER RESEARCH AND APPLICATIONS
(2022)
Article
Ecology
Ron Pierce, Dave Rosgen, Darcie Geenen, Brandon Rosgen
Summary: This study examines the effectiveness of restoring two streams in central Idaho to benefit livestock ranching and wild trout populations. The restoration includes raising the streambeds, connecting to historical floodplains, and using natural channel design methods. The study shows that the restoration significantly improved groundwater levels, instream flows, spawning substrates, and fish populations.
Article
Geography, Physical
Marc Jolivet, Olivier Dauteuil, Louis Gaudare
Summary: Understanding the impact of aeolian processes on the regional-scale dynamics of fluvial systems in semi-arid regions is crucial in the context of climate change. This study examines the formation of parabolic dunes and foredunes along the main rivers of the southern Angolan Plateau and northern Kalahari Basin in Africa, using satellite images and digital elevation models. The findings highlight the interactions between factors such as wind pattern, vegetation cover, morphology of the drainage system, and transport capacity of the rivers, and their implications for fluvial dynamics and sedimentary processes.
Article
Geography, Physical
Fernando Onate-Valdivieso, Arianna Onate-Paladines, Jonathan Armijos, Daniel Puchaicela
Summary: This study establishes regional relationships between bankfull geometry and drainage area in the Andean region of southern Ecuador, obtaining statistically significant correlation coefficients. The geomorphological runoff threshold is determined based on regional bankfull geometry relationships, geomorphological characteristics, and the NRCS unit hydrograph, with proposed future works aiming to improve estimates by considering additional variables and more detailed scales.
Article
Engineering, Environmental
Holly Yaryan R. Hall, Brian P. Bledsoe
Summary: Natural channel design (NCD) and analytical channel design (ACD) are two competing approaches to stable channel design that both consider sediment transport processes. This paper highlights the connection between ACD's capacity/supply ratio (CSR) and NCD's sediment capacity models (FLOWSED/POWERSED), demonstrating their convergent evolution. By modifying an existing CSR analytical spreadsheet tool, the researchers were able to predict channel stability using conventional bed load transport equations and regional sediment regression curves. The study advances the field of stream restoration by reconciling key differences between ACD and NCD and providing insights into reach scale morphodynamics.
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
(2023)
Article
Geography, Physical
J. Horacio Garcia, Alfredo Ollero, Askoa Ibisate, Ian C. Fuller, Russell G. Death, Herve Piegay
Summary: This article explores the role of geomorphology in river management, identifies barriers to its involvement, and proposes principles for living with rivers. The study emphasizes the importance of interdisciplinary collaboration and integrated approaches in river management in order to address challenges in the Anthropocene Era.
Article
Geosciences, Multidisciplinary
Renata Kedzior, Malgorzata Klonowska-Olejnik, Elzbieta Dumnicka, Agnieszka Wos, Maciej Wyrebek, Leszek Ksiazek, Jerzy Grela, Pawel Madej, Tomasz Skalski
Summary: This study investigated the impact of river incision on environmental flow estimation, finding that in highly incised rivers, the environmental flow values are close to the mean annual flow. This leads to river downcutting processes and impoverishment of optimal habitats.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Environmental Sciences
Rocko A. Brown
Summary: This paper reviews analytical methods for determining the size of rescaled channel and floodplain mesohabitat units in regulated gravel-cobble bed rivers for Pacific salmon habitat restoration using hydrogeomorphic scaling and ecohydraulics. These methods can restore habitat quantity and quality by rescaling the river corridor and provide environmental benefits.
Article
Biodiversity Conservation
Xiaotian Qi, Zhiming Zhang, Jiayue Jing, Wenhan Hu, Xin Zhao
Summary: The ecological risks caused by rapid urbanization have severely impacted the ecological security of rivers, especially in developing countries with weak ecological foundation and high population pressure. An urgent need exists for a comprehensive approach to planning and managing river ecological protection in highly urbanized areas of developing countries. This study quantifies the minimum cumulative resistance of river protection and land expansion, assesses river ecological risks, and proposes a method for regional-level planning and management of river ecological protection. The results show the spatial distribution of river ecological risks and recommend protection zones and riparian areas to enhance the connectivity of the local ecological landscape through the river network. The proposed method provides a focused and implementable strategy for administrators to protect and restore the ecological security of urban rivers.
ECOLOGICAL INDICATORS
(2023)
Article
Engineering, Civil
Wafa Chouaib, Daniel Caissie
Summary: The study on water availability in Canada using data from 167 catchments showed notable disparities in annual and monthly water resources, with relatively abundant water on the east and west coasts, but critically low runoff in the prairies and northern territories. Extreme low flow conditions varied across provinces in terms of magnitude, seasonality, and duration.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Samuel F. Bosio, Patrick A. Shirey, Sally A. Entrekin, Timothy J. Hoellein, Ashley H. Moerke, Emma J. Rosi, Jennifer L. Tank, Gary A. Lamberti
Summary: Long-term monitoring of large wood (LW) additions in three small streams in the midwestern USA revealed that most logs moved within the first 3 years and formed aggregations after 14 years. Factors contributing to log movement included high flow events and log position in the channel. The study suggests that adding LW to small, groundwater-dominated streams can provide sustained ecological benefits with minimal risk to downstream reaches.
RIVER RESEARCH AND APPLICATIONS
(2021)
Review
Geography, Physical
Janet Hooke
Summary: Meandering rivers have constantly changing planforms, which can provide guidance on river behavior. The interaction between channels and bars is a major component of morphodynamics at bends. Cut-offs are important in active bend morphodynamics, but then the channel stabilizes. The high rates and variability of morphodynamics in rivers pose challenges for management.