Article
Geosciences, Multidisciplinary
E. A. Olliver, D. A. Edmonds
Summary: Relative sea-level rise will increase flooding and shoreline retreat on river deltas. This study investigates the effects of floods, tides, and vegetation on sedimentation rates on deltaic islands. Results show that floods increase sedimentation while tides decrease it, and vegetation has minimal impact on sedimentation rates.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Gerard Salter, Paola Passalacqua, Kyle Wright, Sarah Feil, Daniel Jensen, Marc Simard, Michael P. Lamb
Summary: This study developed a method for accurately inferring deposition/erosion rates in deltas using remote sensing technology and hydrodynamic models. The results showed that this method can reveal coherent spatial patterns of land change across wide areas in deltas.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Ehab Meselhe, Kazi Sadid, Ashok Khadka
Summary: River deltas are important coastal landforms that are affected by various factors such as subsidence, storms, and sea level rise. Understanding the processes and dynamics of deltas is crucial for coastal restoration efforts. This study applied morphodynamic models to a prograding river delta, specifically the Wax Lake Delta in Louisiana, and successfully validated the models against field observations. The results provide insights into the flow and sediment distribution within interconnected delta channels, influencing the morphodynamics and growth of the delta.
Article
Marine & Freshwater Biology
Andre S. Rovai, Robert R. Twilley, Alexandra Christensen, Annabeth McCall, Daniel J. Jensen, Gregg A. Snedden, James T. Morris, John A. Cavell
Summary: The study reveals that Colocasia esculenta, a species of tidal freshwater marsh, is able to cope with longer hydroperiods caused by river sediment diversions, and even increase its biomass. This is in contrast to previous studies conducted in brackish and saline settings where longer hydroperiods had negative effects on biomass accumulation.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Xuefei Mei, Nicoletta Leonardi, Jiaxi Dai, Jie Wang
Summary: Deltaic tidal flat is a crucial ecosystem for livelihoods worldwide. It is difficult to accurately predict the prograding limit of tidal flats due to their complex and stochastic nature. This study uses numerical simulation to investigate the extension limit of Nanhui Shoal in the Changjiang Estuary.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2023)
Article
Engineering, Marine
Michael S. Owens, Stephen P. Kelly, Thomas A. Frankovich, David T. Rudnick, James W. Fourqurean, Jeffrey C. Cornwell
Summary: The study estimated the net exchange of nitrogen and phosphorus species in estuarine lakes, revealing high efflux of NH4+ in dark conditions and significantly decreased efflux in light conditions. The presence of Chara hornemannii Wallman was found to have a large impact on NH4+ efflux, and it is expected that increased freshwater flow from the Everglades will influence NH4+ release in lakes.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Paul Strobel, Marcel Bliedtner, Andrew S. Carr, Peter Frenzel, Bjoern Klaes, Gary Salazar, Julian Struck, Soenke Szidat, Roland Zech, Torsten Haberzettl
Summary: South Africa plays a key role in reconstructing and understanding past changes in atmospheric circulation, but the scarcity of natural archives has led to ongoing debates about the environmental evolution in South Africa during the late Quaternary. The sediment record from Voelvlei coastal wetland reveals marine incursions and changing moisture patterns from around 8440 cal BP, with an overall trend towards increasing moisture observed throughout the record.
CLIMATE OF THE PAST
(2021)
Article
Engineering, Marine
Edward J. Anthony, Manon Besset, Florin Zainescu, Francois Sabatier
Summary: Determining changes in land and water areas over river deltas based on land-water ratios can help identify subsidence and shoreline erosion, and provide a foundation for studying land-cover and vegetation variations. The spatial pattern of most Mediterranean and Black Sea river deltas is largely characterized by increasing water areas, reflecting a mix of shoreline erosion, land-use changes, and subsidence. Future research should focus on detailed studies of each delta to unravel changes related to land-use, vegetation, and subsidence, as well as the interpretation of wetlands in these ratios.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Meteorology & Atmospheric Sciences
Danlu Cai, Lijun Yu, Jianfeng Zhu, Klaus Fraedrich, Yanning Guan, Frank Sielmann, Chunyan Zhang, Min Yu
Summary: A comprehensive ecohydrological analysis was conducted to understand the formation and evolution of lake Lop Nur and the environmental change over the Tarim River basin. The study revealed that arid regions are less sensitive to changes in excess water and energy, while towns in semiarid regions are more likely to be affected by future dry scenarios. The research also found increasing impacts of anthropogenic activities on the environment and provided climatic evidence of wetter conditions in the central Tarim River basin before 1960, followed by a drying trend. Additionally, the study observed desiccation of lake Lop Nur until the 1970s and its connection with the eastern part of the Taklamakan Sand Sea.
JOURNAL OF HYDROMETEOROLOGY
(2022)
Article
Environmental Sciences
Hezhong Yuan, Panyu Chen, Enfeng Liu, Jianghua Yu, Ziqiu Tai, Qiang Li, Haixiang Wang, Yiwei Cai
Summary: Identifying phosphorus sources and contributions from terrestrial sources is crucial for managing clean water and eutrophication in lake watersheds. This study investigated the concentrations of different phosphorus fractions in soils and sediments of Taihu Lake, a representative freshwater lake watershed. It also surveyed the phosphorus concentrations in the lake's water. The findings suggest that soil runoff predominantly controls phosphorus occurrence in lake sediments as an exogenous source.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Environmental Sciences
Tanja N. Williamson, Faith A. Fitzpatrick, Rebecca M. Kreiling
Summary: Sediment fingerprinting of fluvial targets has proven useful for conservation management in the United States. This study explores the potential of using source samples from similar physiographic basins or combining samples from multiple basins to decrease the cost of these studies.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Geosciences, Multidisciplinary
William F. Kenney, Michael R. Shields, Thomas S. Bianchi, Alexander S. Kolker, David Mohrig
Summary: This study investigates the relative contributions of large-scale flood events and lesser river flows to deltaic land growth using the Wax Lake Delta as a natural laboratory. The results show that excess 210Pb has the potential to be a useful indicator of sedimentation mode on active delta surfaces.
Article
Engineering, Environmental
Francois Clayer, Morten Jartun, Nina T. Buenaventura, Jose-Luis Guerrero, Amy Lusher
Summary: Microplastic research initially focused on marine environments, neglecting freshwater ecosystems which are also vulnerable to microplastics. Recent study in Norway's largest lake showed that majority of microplastics came from urban waste mismanagement and agricultural practices, with only a small portion settling to the lake bottom. The distribution and sources of microplastics in the lake sediments suggest urban and agricultural areas are important emission hotspots.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Marine
Qian Zhang, Chunyan Li, Wei Huang, Jun Lin, Matthew Hiatt, Victor H. Rivera-Monroy
Summary: This study evaluates the spatiotemporal patterns of water circulation induced by six atmospheric cold front events in the Wax Lake Delta region using a 3-D hydrodynamic model. The results show that cold fronts significantly impact channelized and inter-distributary water flow, as well as landward flow and storm surge on the coast. The magnitude and duration of the flushing events vary, and the wind associated with cold fronts is the main driver of water circulation in the region.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Nguyet-Minh Nguyen, Duong Do Van, Duy Tu Le, San Dinh Cong, Le Thanh Chuong, Thuan Duong Hai, Thanh Cong Nguyen, David Wright, Ahad Hasan Tanim, Nhat Truong Pham, Phong Nguyen Thanh, Duong Tran Anh
Summary: In this study, experimental and numerical modeling were conducted to investigate the impact of breakwater gaps on bedload sediment transport and nearshore bed morphology. The results indicated that the gap width has a significant influence on sediment transport and bed morphology. The breakwater gaps can generate high current speed and flow due to wave diffraction, which accelerates shoreline and bed erosion. Additionally, the gaps facilitate sediment supply and enhance the living shoreline. Furthermore, the sediment exchange rate is affected by water levels and wave amplitudes.