Article
Environmental Sciences
Jun Zhao, Liangsheng Zhu, Jianhua Li
Summary: A high resolution mathematical model was established to simulate the intrusion movement of saltwater in an estuary area, and its accuracy was confirmed by comparing it with a physical flume experiment. The results indicate that under the combined action of runoff and tide, the advance distance of saltwater intrusion will reach a dynamic equilibrium state.
Article
Oceanography
Bouke Biemond, Huib E. E. de Swart, Henk A. A. Dijkstra
Summary: Salt overspill, which refers to the net salt transport from one channel to another in an estuarine network, can significantly contribute to salt intrusion. This study constructed an idealized subtidal model to investigate the sensitivity of overspill to different factors such as river discharge, tidal current, and channel characteristics. The results showed that increasing river discharge generally reduced the amount of salt overspill, but exceptions were found in the weak river discharge regime. Additionally, the strength of tidal currents had contrasting effects on overspill in different estuary systems.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Oceanography
P. MacCready, R. M. McCabe, S. A. Siedlecki, M. Lorenz, S. N. Giddings, J. Bos, S. Albertson, N. S. Banas, S. Garnier
Summary: A realistic numerical model is used to study the circulation and mixing of the biologically productive Salish Sea. The study shows that residence times are longer due to reflux and incomplete tracer homogenization in sub-volumes.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
E. P. Lemagie, S. N. Giddings, P. MacCready, C. Seaton, X. Wu
Summary: The exchange between estuaries and the coastal ocean plays a vital role in influencing nutrient and phytoplankton concentrations and regulating various estuarine processes. Monitoring this exchange is challenging due to the complex flow patterns and sharp gradients in water properties. This study suggests that using three to four evenly distributed moorings can accurately capture the majority of the exchange flow, improving our ability to observe and monitor water mass exchange and transport efficiently with limited resources.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Chang He, Zhen-Yu Yin, Alessandro Stocchino, Onyx Wing Hong Wai
Summary: This study numerically investigates the flow structure and mechanism of macro-vortex generation in estuarine compound channels. It is found that the velocity magnitude in channels is significantly larger than in floodplains, resulting in a high-velocity gradient at the depth discontinuity. The distribution of macro-vortices is closely related to high vorticity regions.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Oceanography
Bouke Biemond, Huib E. de Swart, Henk A. Dijkstra, Manuel Diez-Minguito
Summary: Freshwater pulses have significant impacts on estuarine salinity, with changes proportional to the ratio of peak and background river discharge. The adjustment time scales with the ratio of change in salt intrusion length and peak river discharge, while recovery time is independent of the decrease in salt intrusion length caused by the pulse. The strength of tides has minimal importance to salt dynamics.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Engineering, Civil
Irene Setiawan, Leanne K. Morgan, Crile Doscher
Summary: Estuarine rivers play a crucial role in allowing seawater to travel upstream and salinize adjacent aquifers. However, the mechanism of riparian saltwater intrusion has received less attention compared to saltwater intrusion at the coast. This study collected time series measurements of river and groundwater freshwater head, specific conductance, and hydraulic gradient to investigate the relationships and fluctuations in both systems. The findings suggest that cyclic flow processes drive the alternation of saltwater intrusion and retreat, with the occurrence of negative hydraulic gradient potentially leading to increased groundwater salinization.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Marine
Humberto Pereira, Magda C. Sousa, Luis R. Vieira, Fernando Morgado, Joao M. Dias
Summary: This study investigates the hydrological characteristics and interactions of the Minho and Lima estuaries using a numerical model. It predicts that climate change may lead to increased salinity and salt intrusion in the head and mouth of the estuaries. The model also suggests that estuarine plumes will reduce in size during the winter period in the future. Overall, this study provides valuable insights into the physical patterns and potential impacts of climate change on these estuaries.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
K. De Vriendt, T. Le Borgne, M. Pool, M. Dentz
Summary: This article presents an analytical model for predicting the mixing dynamics along the interface of steady-state flow in coastal aquifers. The model accurately captures the non-monotonic evolution of mixing width and mixing rates, offering a new framework for understanding and modeling mixing and reaction processes in coastal aquifers.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Maqsood Mansur, Julia Hopkins, Qin Chen
Summary: This study investigates the sensitivity of Calcasieu Lake estuarine region in southwest Louisiana, USA, to channel deepening. The results show that deepening the channel increases the inland penetration of storm surge and vulnerable to flood. The study also analyzes the impact of channel deepening on storm surge in estuaries under future sea-level rise scenarios, suggesting an increase in flood risk.
Article
Environmental Sciences
Joeri van Engelen, Marc F. P. Bierkens, Joost R. Delsman, Gualbert H. P. Oude Essink
Summary: Most river deltas are densely populated areas with intensive agriculture. The increased shortage of fresh surface water leads to increased groundwater pumping, resulting in sea water intrusion. Understanding the current distribution of fresh-salt groundwater is crucial for predicting the future of fresh groundwater resources in deltas, but uncertainties about these distributions and their drivers are significant.
WATER RESOURCES RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Giorgia Verri, Sahameddin Mahmoudi Kurdistani, Giovanni Coppini, Andrea Valentini
Summary: This study improves the CMCC EBM model by introducing non-dimensional equations to make estuary length and horizontal eddy diffusivity coefficient time-variable, leading to enhanced model capability to reproduce salinity at the estuary mouth.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Multidisciplinary Sciences
Danial Khojasteh, Shengyang Chen, Stefan Felder, Valentin Heimhuber, William Glamore
Summary: The response of estuaries to sea level rise is complex and influenced by various factors such as energy drivers, estuarine geometry, and fluid properties. Overall, sea level rise tends to amplify tidal range in different estuary types, except for short estuaries where it may attenuate tides. Changes in tidal range are more pronounced in certain types of estuaries, such as converging estuaries or those with strong river inflows.
Article
Marine & Freshwater Biology
Shuo Huang, Wenrui Huang, Guihui Zhong
Summary: This study investigates the effects of groins on density-induced flow in an estuarine navigation channel through PIV based laboratory experiments. The results indicate that groins modify the velocity field in the channel, restrict the spread of density currents, and reduce the velocity of density-induced flow. Groins can effectively reduce sediment transport in estuarine navigation channels.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Engineering, Civil
Johan C. Winterwerp, Zheng-Bing Wang
Summary: This paper discusses the effects of anthropogenic deepening of tidal rivers on tidal distortion and residual sediment transport. It highlights the importance of tidal elevation and velocity asymmetries in shaping river morphology. The study emphasizes the need to consider nonlinear interactions and overall morphodynamic responses when analyzing the impact of deepening tidal rivers.
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING
(2021)