Article
Environmental Sciences
John Gardner, Tamlin Pavelsky, Simon Topp, Xiao Yang, Matthew R. Ross, Sagy Cohen
Summary: Humans have significantly disrupted the global sediment cycle, affecting river morphology and ecosystems. Based on satellite observations from 1984 to 2018, the RivSed database provides a spatially explicit view of river sediment, revealing declining trends in sediment concentration in 32% of US rivers. Most rivers show decreasing sediment concentration downstream, primarily due to large dams. Comparing observations with models, there are differences in longitudinal sediment concentration patterns. RivSed has important implications for river geomorphology and ecology, illustrating human impacts on US river corridors.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Engineering, Civil
Teresa Serra, Marianna Soler, Aina Barcelona, Jordi Colomer
Summary: Sediment-replenished artificial flooding results in a more balanced suspended sediment transport compared to non-sediment-replenishment cases, with higher sedimentation rates during flood events.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Arman Haddadchi, Murray Hicks
Summary: The study analyzed the hysteresis relationship between suspended sediment concentration and flow during runoff events in 17 catchments in New Zealand. Results showed differences between pasture- and forest-dominated catchments, with sediment peaks lagging flow peaks in pasture areas and vice versa in forest areas. Flood total runoff and duration were identified as key variables controlling the hysteresis patterns in each catchment. These findings have immediate implications for river management programs and the development of suspended sediment routing models. Future research could focus on reducing ambiguity in interpreting hysteresis factors using larger datasets and high-resolution sediment tracing.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Environmental Sciences
Hyoseob Noh, Yong Sung Park, Il Won Seo
Summary: Sediment transport load monitoring is important in civil and environmental engineering fields. This study proposes estimation models for the suspended-to-total load fraction using dimensionless hydro-morphological variables, and reveals the relations between them using symbolic regression methods. Clustering analyses help identify the underlying relationships between variables. These models are practical and easy to implement in other suspended sediment monitoring methods.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Hyoseob Noh, Yong Sung Park, Il Won Seo
Summary: Sediment transport load monitoring is important in civil and environmental engineering. This study proposes estimation models for the suspended-to-total load fraction using dimensionless hydro-morphological variables. The models were developed through feature elimination and symbolic regression methods. Clustering analysis and sensitivity analysis were also conducted for a deeper understanding of variable relationships.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Ty Sok, Chantha Oeurng, Vinhteang Kaing, Sabine Sauvage, G. Mathias Kondolf, Jose Miguel Sanchez-Perez
Summary: This study analyzed sediment loads in the Mekong River from 1993 to 2018 and found that Tonle Sap Lake has become a sink for sediment since 2001, accumulating a significant amount annually. This has reduced the annual sediment transport to the delta, exacerbating the effects of reduced sediment delivery resulting from upstream dam development and instream sand mining.
Article
Environmental Sciences
John Pitlick, Alain Recking, Fred Liebault, Clement Misset, Guillaume Piton, Daniel Vazquez-Tarrio
Summary: Global compilations of river sediment loads show that mountainous areas contribute significantly to the sediment transported to the oceans. This study focused on estimating the contemporary sediment loads of 16 gravel bed rivers draining the Ecrins-Pelvoux Massif in southeast France. The results indicate a linear relationship between bed load fluxes at channel-forming flows and downstream increases in discharge, as well as a linear scaling of annual sediment loads with drainage area.
WATER RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Paolo Billi, Velibor Spalevic
Summary: This study utilized suspended sediment yield field data measured by the national and regional hydrological services to investigate the factors influencing sediment yield in Italy. The research found a wide variation in sediment yield and attributed the marked decrease in sediment yield in Italy to factors such as reduced annual precipitation and forest expansion.
Article
Meteorology & Atmospheric Sciences
Hamish D. Prince, Nicolas J. Cullen, Peter B. Gibson, Jono Conway, Daniel G. Kingston
Summary: Extreme precipitation events in New Zealand have devastating impacts on the local society and environment. An automated atmospheric river detection technique is used to study extreme precipitation climatology, revealing seasonal and regional variations. AR events have the highest impact on the western coast of New Zealand, with precipitation totals exceeding 1000 mm.
JOURNAL OF CLIMATE
(2021)
Article
Environmental Sciences
D. N. Livsey, R. D. R. Turner, P. R. Grace
Summary: Optical and acoustic backscatter measurements are combined to quantify suspended-sediment concentration and particle size in suspensions dominated by muddy flocculated sediment. The sediment composition index (SCI) is used to predict the ratio of suspended-sediment concentration to acoustic backscatter under changes in particle size and density, and to estimate suspended-sediment concentration that is independent of changes in particle size and density. The SCI is found to be sensitive to changes in particle size and the estimates of particle bulk apparent density from SCI are biased by changes in particle size.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Civil
Shangwu Liu, Dayu Wang, Wei Miao, Zhili Wang, Peng Zhang, Danxun Li
Summary: Understanding the change in sediment load at a flood-event scale is crucial for channel regulation and reservoir operation in the Upper Yangtze River basin. This study collected field data and conducted statistical analysis to investigate the variations in runoff and sediment load during flood events. The results indicate that flood events contribute more to the annual sediment load than runoff volume. Furthermore, there is a general decreasing trend in sediment load, which can be attributed to soil conservation efforts and dam construction.
JOURNAL OF HYDROLOGY
(2023)
Article
Geography, Physical
Andrew J. Neverman, Mitchell Donovan, Hugh G. Smith, Anne-Gaelle Ausseil, Christian Zammit
Summary: Soil is a critical resource that supports ecosystem services and human needs. Land degradation processes such as erosion and increased sediment loads impact downstream environments. Existing erosion and sediment load models are inadequate for assessing the effects of climate change. A new modelling framework is introduced that estimates sediment load changes under future climate conditions and highlights the importance of recognizing spatial variations in erosion processes and catchment loads.
Article
Engineering, Civil
Laxmipriya Mohanty, Prashant Istalkar, Basudev Biswal
Summary: Understanding and modeling the dynamics of suspended sediment concentration (C) in river channels is crucial. The sediment rating curve that relates C with river discharge (Q) is a widely used approach due to its simplicity and effectiveness. However, the relationship between C and Q is not unique and changes over time. This study analyzes recession periods and proposes a model that can predict future suspended sediment concentration based on past data. The results emphasize the importance of recognizing the dynamic nature of the C-Q relationship.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Sagy Cohen, Jaia Syvitski, Thomas Ashely, Roderick Lammers, Balazs Fekete, Hong-Yi Li
Summary: Bedload is difficult to measure and model, and its dynamics in most fluvial systems worldwide remain unknown. This study presents a global scale bedload flux model that predicts the distribution of water discharge, suspended sediment, and bedload, and analyzes the sensitivity of bedload predictions to various factors. The results show that river discharge and slope are the key drivers of bedload trends.
WATER RESOURCES RESEARCH
(2022)
Article
Engineering, Multidisciplinary
Nannan Zhao, Alireza Ghaemi, Chengwen Wu, Shahab S. Band, Kwok-Wing Chau, Atef Zaguia, Majdi Mafarja, Amir H. Mosavi
Summary: Estimation of suspended sediment load (SSL) is crucial for water resources management, with the ITD-EPR method proving to be the most accurate in predicting SSL at the Sarighamish and Varand Stations in Iran. This method outperformed other approaches like MT and SRC, showcasing its superior predictive capabilities.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2021)
Article
Water Resources
Arman Haddadchi, Jon Olley, Timothy Pietsch
HYDROLOGICAL PROCESSES
(2016)
Article
Geosciences, Multidisciplinary
Arman Haddadchi, Doug J. Booker, Richard J. Measures
Article
Environmental Sciences
Kazem Nosrati, Arman Haddadchi, Adrian L. Collins, Saeedeh Jalali, Mohammad Reza Zare
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2018)
Article
Environmental Sciences
Arman Haddadchi, Murray Hicks, Jon M. Olley, Shailesh Singh, I. M. S. Sriniyasan
LAND DEGRADATION & DEVELOPMENT
(2019)
Article
Environmental Sciences
Joseph M. McMahon, Jon M. Olley, Andrew P. Brooks, James C. R. Smart, Ben Stewart-Koster, William N. Venables, Graeme Curwen, Justine Kemp, Morag Stewart, Nina Saxton, Arman Haddadchi, Justin C. Stout
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Ecology
Arman Haddadchi, Anika Kuczynski, Joanna T. Hoyle, Cathy Kilroy, Doug J. Booker, Murray Hicks
ECOLOGICAL MODELLING
(2020)
Article
Environmental Sciences
Arman Haddadchi, Murray Hicks
Summary: The study analyzed the hysteresis relationship between suspended sediment concentration and flow during runoff events in 17 catchments in New Zealand. Results showed differences between pasture- and forest-dominated catchments, with sediment peaks lagging flow peaks in pasture areas and vice versa in forest areas. Flood total runoff and duration were identified as key variables controlling the hysteresis patterns in each catchment. These findings have immediate implications for river management programs and the development of suspended sediment routing models. Future research could focus on reducing ambiguity in interpreting hysteresis factors using larger datasets and high-resolution sediment tracing.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Water Resources
Hamish J. Biggs, Arman Haddadchi, D. Murray Hicks
Summary: This paper presents a field study on suspended sediment transport through aquatic vegetation, showing that suspended sediment concentrations are highly dependent on the abundance of aquatic vegetation and can be remobilized after vegetation removal. The study also found that hydraulic resistance in the river reach significantly decreased after vegetation cutting, indicating potential implications for flow-vegetation interactions.
HYDROLOGICAL PROCESSES
(2021)
Article
Engineering, Civil
Kazem Nosrati, Zeinab Mohammadi-Raigani, Arman Haddadchi, Adrian L. Collins
Summary: This study investigated the temporal variability of sediment sources in a mountainous catchment in Iran during and between flood events using geochemical fingerprinting and Bayesian un-mixing model. The results showed significant variations in the relative contributions from different sources and source types, with Quaternary surface soils and channel banks being dominant at different stages. Managing sediment loss from both surface soils and channel banks is essential.
JOURNAL OF HYDROLOGY
(2021)
Article
Chemistry, Analytical
Hamish Biggs, Andrew Starr, Brendon Smith, Steve de Lima, Julian Sykes, Arman Haddadchi, Graeme Smart, Murray Hicks
Summary: Discrete particle dynamics is a poorly understood aspect of river bedload transport. This paper presents the development and application of sensors for measuring stone movement during floods, as well as their potential use in other harsh environments.
Article
Fisheries
Leigh M. Stevens, Barrie M. Forrest, Bruce D. Dudley, David R. Plew, John R. Zeldis, Ude Shankar, Arman Haddadchi, Keryn L. Roberts
Summary: This study investigates the utility of the Opportunistic Macroalgal Blooming Tool (OMBT) in the New River Estuary, Southland, New Zealand. The results show that increases in total nitrogen (TN) loads led to expansions in the opportunistic macroalgae and wet weight biomass. The study confirms the responsiveness of the OMBT to TN concentration changes and its potential in determining estuary-specific TN concentration thresholds for load reduction.
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
(2022)
Article
Environmental Sciences
Arman Haddadchi, Calvin W. Rose
Summary: Interpreting the links between fine sediment storage and suspended sediment transport during flood events is crucial for understanding river geomorphology and the impacts on water quality and bed habitats. A physically based model of suspended sediment transport, coupled with fine sediment deposition and re-entrainment processes within the gravel bed, is presented. The model provides valuable information on the dynamics of fine sediment and its effects on river bed changes. Testing the model with data from flood events in the Oreti River in New Zealand shows good agreement between observed and modeled fine sediment concentration and load. The model can be used for routing suspended sediment concentration and changes in fine sediment deposition in river networks.
WATER RESOURCES RESEARCH
(2022)
Article
Geography, Physical
Arman Haddadchi, Calvin W. Rose, Jon M. Olley, Andrew P. Brooks, Joe McMahon, Timothy Pietsch
EARTH SURFACE PROCESSES AND LANDFORMS
(2018)
Article
Geography, Physical
Calvin W. Rose, Jon M. Olley, Arman Haddadchi, Andrew P. Brooks, Joe McMahon
EARTH SURFACE PROCESSES AND LANDFORMS
(2018)