Article
Environmental Sciences
Li-Shan Tan, Zhen-Ming Ge, Shi-Hua Li, Ya-Lei Li, Li-Na Xie, Jian-Wu Tang
Summary: Reclaimed creeks showed significantly increased concentrations of dissolved carbon and nitrogen species, with slightly decreased N2O and NO3--N. They also exhibited higher global warming potential, making them hotspots for greenhouse gas effects compared to natural tidal creeks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Civil
Clarissa Glaser, Sven Frei, Gudrun Massmann, Benjamin Silas Gilfedder
Summary: This study evaluates the interaction between terrestrial aquifer system, catchment morphology, and coastal SGD flux on a tidal creek system in Spiekeroog, Germany. The findings show that the spatial and temporal exchange of fresh and saline water between the catchment and coastal zone is influenced by tidal creeks and catchment morphology.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Ya-Nan Tang, Jun Ma, Jing-Xian Xu, Wan-Ben Wu, Yuan-Chen Wang, Hai-Qiang Guo
Summary: This study mapped the spatial distributions of salt marsh communities and their aboveground biomass (AGB) using image and LiDAR data acquired by a UAV. The results showed that the AGB estimation model based on UAV-LiDAR data and a random forest algorithm had high accuracy.
Article
Geography, Physical
Zoe Hughes, Sarah Farron, Duncan Fitzgerald
Summary: Expansion of drainage networks through the headward erosion of tidal creeks is a response of salt marshes to sea-level rise. This response reduces the potential for submergence and marsh platform loss.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Oceanography
Collin Ortals, Orlando Cordero, Arnoldo Valle-Levinson, Christine Angelini
Summary: Intertidal creeks play a significant role in connecting salt marshes and influencing the spatial heterogeneity in plant and animal distributions. The study reveals that the effective drag in these creeks is significantly higher than bed drag, leading to asymmetrical drag between tidal flood and ebb phases. Pressure gradient and friction dominate creek momentum balance, highlighting potential impacts on eco-geospatial evolution of salt marshes.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Marine & Freshwater Biology
Julia D. S. Friese, Axel Temming, Andreas Daenhardt
Summary: Inundated salt marshes are valued as nekton habitat due to their low predator and high prey abundance. Habitat quality is dependent on abiotic properties, including water temperature, oxygen concentration, flow velocity, turbidity, and sediment grain size. Despite seasonal variations, salt-marsh creeks provide relatively stable temperature and oxygen conditions, sheltered by vegetation and characterized by low flow velocities and fine sediments. Turbidity plays a significant role in nekton species occurrence, while temperature has a minor impact. Small nekton species dominate in salt-marsh creeks due to their ability to cope with extreme temperatures and benefit from reduced currents.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Marine & Freshwater Biology
Julia D. S. Friese, Axel Temming, Andreas Daenhardt
Summary: This study explores the fish and crustacean species in German Wadden Sea salt marshes, highlighting ten dominant species and seasonal and diurnal patterns in nekton communities.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Environmental Sciences
Thomas E. Kutcher, Kenneth B. Raposa
Summary: Tidal restoration efforts in salt marshes have led to some biological recovery, but incomplete restoration is common due to inundation stress and eutrophication. This study highlights the importance of long-term biological monitoring and the use of rapid assessment data to provide valuable context for restoration findings and guide future restoration practices.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Biodiversity Conservation
Caroline R. Narron, Jessica L. O'Connell, Deepak R. Mishra, David L. Cotten, Peter A. Hawman, Lishen Mao
Summary: Remote sensing is crucial for understanding coastal wetland ecosystems, but tidal inundation affects the reliability of remote sensing-based models. To address this issue, we developed the Flats index to identify and filter flooded pixels. We also demonstrated innovative applications of the index in detecting flooding frequency and patterns.
ECOLOGICAL INDICATORS
(2022)
Article
Environmental Sciences
Maosheng Yin, Kai Xiao, Pei Xin, Hailong Li, Chunmiao Zheng, Erik Smith, Alicia M. Wilson
Summary: This study investigates the impact of crab burrows on groundwater flow and salt transport in coastal wetlands. The results show that crab burrows can form complex networks of preferential flow paths, enhancing groundwater and salt circulation. The morphology of the burrows also plays a key role in the depth and intensity of burrow flushing.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Kelly Elschot, Martin J. Baptist, Marinka E. B. van Puijenbroek
Summary: A global concern for coastal ecosystems is the predicted rise in sea-level for which salt marshes must keep pace. Variables that control this elevation change need to be identified to predict the adaptability of marshes to future sea-level rise. Grazing by livestock can significantly reduce the annual rates of elevation gain and affect the future adaptability of salt marshes to grow vertically for rising sea levels. Trampling by grazing cattle, along with other factors like precipitation deficit and extreme drought, can lead to biocompaction and reduce the total elevation change.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Faming Wang, Meagan Eagle, Kevin D. Kroeger, Amanda C. Spivak, Jianwu Tang
Summary: The study found that restored salt marshes had lower elevation but greater plant biomass, ecosystem production, respiration, and CO2 exchange compared to natural references. Respiration rates in aboveground biomass and soil were also higher in restored marshes. This suggests that well-restored salt marshes may enhance carbon sequestration rates and extend marsh survival.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Soil Science
Hollie E. Emery, John H. Angell, Akaash Tawade, Robinson W. Fulweiler
Summary: Coastal wetlands exhibit different emission patterns of CO2, CH4, and N2O following tidal inundation and rainfall, and accurately predicting carbon and nitrogen cycling in salt marshes requires considering pulse responses and baseline gas flux rates.
SOIL BIOLOGY & BIOCHEMISTRY
(2021)
Article
Water Resources
Emilio Grande, Erin C. Seybold, Corianne Tatariw, Ate Visser, Anna Braswell, Bhavna Arora, Francois Birgand, John Haskins, Margaret Zimmer
Summary: Salt marshes can remove terrestrial nutrients before they reach the coast. However, our understanding of the variability of reactive solutes and processes within salt marshes is limited. In this study, we monitored nitrate concentrations in salt marsh porewater at Elkhorn Slough in California, USA, using a high-frequency sampling system. We found that tidal and seasonal hydrologic fluxes control nitrate dynamics and export in coastal environments.
HYDROLOGICAL PROCESSES
(2023)
Article
Environmental Sciences
Fenyan Ma, Jiansheng Chen, Lucheng Zhan, Tao Wang, Jiaheng Yan, Xi Zhang
Summary: The relationship between groundwater and seawater is sensitive, especially in coastal regions with developed faults. In this study, the impact of groundwater exploitation on confined groundwater and seawater was analyzed in the Subei Basin. The results show that seawater intrusion has negligible effect on confined groundwater, but groundwater desalination is apparent. The study also reveals that the upward recharge of basalt groundwater through active faults plays a significant role in the relationship between groundwater and seawater.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Civil
Xiaogang Chen, Peiyuan Zhu, Yan Zhang, Ling Li
Summary: Seasonal rainfall, known as plum rain, has the potential to influence greenhouse gas dynamics in saltmarshes. However, there have been no reported studies on its effects. This study quantified porewater exchange and greenhouse gas fluxes in a saltmarsh over a tidal cycle during the plum rain season. The results show that plum rain-derived porewater exchange significantly increased CO2 inventory and reduced pH, potentially contributing to coastal acidification.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Shengjie Hu, Zhenlei Yang, Sergio A. G. Torres, Zipeng Wang, Ling Li
Summary: Through a systematic investigation of 23,259 lakes in 11 hydroclimatic zones of China, it was found that there are differences in the fractal scaling relationships between the morphometric and hydrological parameters of lakes. While lake morphometric parameters follow a power law distribution, lake hydrological parameters do not show a power law relationship with lake area. The study also revealed that the applicability of the power law distribution for lake area varies across different regions and is significantly influenced by human activities.
Article
Oceanography
Leihua Zhao, Pei Xin, Haifeng Cheng, Ao Chu
Summary: This study investigates the response of estuarine turbidity maxima (ETM) dynamics in the Yangtze Estuary (YE) to the construction of the Three Gorges Dam (TGD) and morphological evolution. The results show that the TGD construction and estuarine morphological evolution have led to decreased ETM area and changes in location. The effects of TGD construction dominate the upper estuary, while the effects of the estuarine morphological evolution are dominant in the mid-lower estuary. These findings have important implications for the management of the YE and other similar estuaries.
CONTINENTAL SHELF RESEARCH
(2023)
Article
Environmental Sciences
Chengji Shen, Yu Fan, Yongqing Zou, Chunhui Lu, Jun Kong, Yue Liu, Ling Li, Chenming Zhang
Summary: Salt pans are important features in coastal marshes and their formation is influenced by factors such as evaporation rate, tidal amplitude, and marsh platform slope. This study found that salt pans tend to form in the lower supratidal zone due to sustained evaporation, while they can hardly grow in the intertidal zone due to regular tidal flushing. The decrease in potential evaporation rate, tidal amplitude, and/or marsh platform slope strengthens the hydraulic connection between the marsh surface and underlying watertable, resulting in thicker and wider salt pans. These findings contribute to a better understanding of marsh eco-hydrology and provide guidance for preventing their degradation.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Tingchang Yin, Teng Man, Ling Li, Sergio Andres Galindo-Torres
Summary: We propose a finite-size scaling hypothesis to predict the global permeability of fracture networks. To validate the hypothesis, we generate numerous discrete fracture networks and numerically calculate the permeability. Our results show that the dimensionless permeability, scaled by moments of local conductivity and fracture sizes and corrected by two stereological ratios, can capture variations in fracture attributes. The universal form obtained in this study can also explain contradictory observations regarding the permeability and domain size of fracture networks. We demonstrate how a clear transition point is obtained from this universal form, where the permeability remains constant with changing domain size. This study provides a solid theoretical foundation to understand the connection between fracture attributes and field-scale hydraulic properties.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Xinghua Xu, Pei Xin, Tingzhang Zhou, Xiayang Yu
Summary: Macropores, such as crab burrows, are common features in salt marsh sediment and play a significant role in pore-water flow. This study investigated the impact of macropores on saline water evaporation and pore-water salinity through laboratory experiments and numerical simulations. The results showed that macropores increased evaporation rates and influenced pore-water salinity distribution. The findings provide insights into the biogeochemical processes in salt marshes and emphasize the importance of macropores in regulating soil conditions.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Mechanical
Kunpeng Su, Dingkang Xia, Jianhua Wu, Pei Xin, Yu Wang
Summary: Synergistic cavitation-particle erosion often occurs in high-speed sediment-laden flow in hydraulic structures and machines. Erosion prediction is challenging due to the unclear relationship between erosion and the characteristics of sand and silt-sized sediments. This study investigated the influence of sediment particle size distribution (PSDS) characteristics on vibratory erosion tests for carbon steel. The results showed that both sediment concentration and PSDS parameters had a major impact on synergistic erosion.
Article
Environmental Sciences
Wei Zhao, Ke-Hua Zhu, Zhen-Ming Ge, Qing Lv, Shi -Xian Liu, Wei Zhang, Pei Xin
Summary: Coastal wetlands are important carbon sinks in mitigating climate change. However, plastic waste pollution in these ecosystems has unclear effects on carbon flux. Our study found that polluted coastal wetlands are significant sources of carbon dioxide emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Civil
Zhenlei Yang, Zi Li, Xin Tong, Shengjie Hu, Jun Wang, Shuting Ji, Ling Li
Summary: Accurate descriptions of soil hydraulic properties require consideration of both capillary and noncapillary processes. This study extended the Weibull distribution models to complete dryness and compared their performance with the original models. The improved models effectively described the hydraulic properties from saturation to complete dryness. The physically-based approach developed in this study allows for reliable prediction of hydraulic conductivity without the need for fitted conductivity parameters.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Xiayang Yu, Pei Xin, Zhaoyang Luo, Li Pu
Summary: Freshwater injection is an effective method for mitigating seawater intrusion in coastal aquifers, but its thermal impacts on groundwater flow and salt transport are not well understood. This study examines the dynamic characteristics of salinity distributions and seawater recirculation in coastal unconfined aquifers subjected to freshwater injection and tides. The findings reveal that the development of thermal plume towards the sea affects the transient behavior of saline plumes and saltwater wedges, resulting in a prolonged aquifer response to injected freshwater. These results contribute to a better understanding of the processes involved in freshwater injection in coastal aquifers and provide guidance for the management of coastal groundwater resources.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Environmental
Wenzhao Liang, Xiaogang Chen, Chen Zhao, Ling Li, Ding He
Summary: Dissolved organic matter (DOM) in saltmarshes plays a crucial role in the production of greenhouse gases (GHG). Specific types of DOM, such as protein-like DOM, are likely to produce CH4, while humic-like DOM tends to produce CO2. Both hydrodynamics and chemical reactions influence GHG emissions, with hydrodynamics being more important in the short term and chemical reactions being crucial on seasonal scales.
Article
Environmental Sciences
Maosheng Yin, Kai Xiao, Pei Xin, Hailong Li, Chunmiao Zheng, Erik Smith, Alicia M. Wilson
Summary: This study investigates the impact of crab burrows on groundwater flow and salt transport in coastal wetlands. The results show that crab burrows can form complex networks of preferential flow paths, enhancing groundwater and salt circulation. The morphology of the burrows also plays a key role in the depth and intensity of burrow flushing.
WATER RESOURCES RESEARCH
(2023)
