Article
Environmental Sciences
Wenjuan Zheng, Zhenlei Yang, Xiaoxuan Wang, Hailong Wang, Xuan Yu, Lian-Ping Wang, Bin He
Summary: This study investigated the spatiotemporal dynamics of soil moisture and salinity in a reclaimed wetland park in Guangdong Province, China. The results showed that diel evaporation influenced soil water up to a depth of 40 cm, while extreme rainfall only increased topsoil moisture without significant effects on soil salinity. Salt accumulation occurred at depths between 40 and 70 cm during the rainy season, persisting until the end of the monitoring period. In the dry season, the topsoil became salinized up to a depth of 30 cm, but recovered after rainfall.
MARINE POLLUTION BULLETIN
(2022)
Article
Engineering, Civil
Qinpeng Chang, Tianyuan Zheng, Chenchen Gao, Xilai Zheng, Marc Walther
Summary: Cutoff walls have been widely used to control seawater intrusion in coastal regions. However, the impact of cutoff walls on downstream groundwater deterioration in coastal aquifers has not been clarified. This study used indoor experiments and numerical simulations to investigate the downstream saltwater behaviors considering the construction of cutoff walls. The results showed that cutoff walls could affect the salt distribution, freshwater discharge, and groundwater quality in the downstream area. Factors such as wall opening size, wall distance to the sea, hydraulic gradient, and dispersivity all influenced the salt distribution and freshwater discharge. Cutoff walls are not suitable for coastal aquifers with low hydraulic gradient, but a cutoff wall closer to the sea can minimize groundwater salinization without increasing construction cost.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Kathryn Hofmeister, Robert Lerch, Claire Baffaut, John Yang, Fengjing Liu
Summary: Through investigating the Goodwater Creek Experimental Watershed in Missouri, we found that soils with low permeability are prone to nutrient loss and determining hydrologic pathways is crucial for stream contamination mitigation. The complex recharge pathways create stochastic conduits for nitrate transport, posing significant challenges for water quality management.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Julieta Galliari, Lucia Santucci, Lucas Misseri, Eleonora Carol, Maria del Pilar Alvarez
Summary: The study conducted a comparative analysis of groundwater salinity in coastal wetlands of four natural reserves in Argentina, finding an increase in salinity along a latitudinal gradient. The results showed that the ionic contents in groundwater were partially controlled by the salinity of tidal flood water, with the southern wetlands experiencing a significant increase in groundwater ionic concentrations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Lin Wu, Leilei Min, Meiying Liu, Yucui Zhang, Hongwei Pei, Hongjun Li, Guanglu Zhang, Shiqin Wang, Yanjun Shen
Summary: Understanding soil water dynamics in the deep vadose zone of irrigated farmland is critical. In this study, monitoring of soil water content and matric potential was extended across the entire vadose zone profile. The response of soil water in the deep vadose zone to water inputs at the ground surface was sequentially delayed with an increase in depth. This study revealed the rapid response of soil water in the deep vadose zone to water input under intensively irrigated cropland, contributing to a better understanding of groundwater recharge processes.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Tengfei Fu, Chenzhe Li, Zhenyan Wang, Chen Qi, Guangquan Chen, Yushan Fu, Qiao Su, Xingyong Xu, Wenquan Liu, Hongjun Yu
Summary: Groundwater quality in Guangxi Province, China is influenced by seawater intrusion and anthropogenic activities. The study found that groundwater composition is associated with seawater, and the main types are Ca·Na-Cl, Ca·Na-HCO3, and Ca-HCO3·Cl. Seawater intrusion and human activities contribute to the evolution of groundwater characteristics, with seawater intrusion being the main factor for increased salinity and human activities causing nitrate pollution. The results highlight the importance of sustainable groundwater resource management in Guangxi coastal zone.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Salah Ouhamdouch
Summary: In this study, the evaluation of groundwater in the Haha region using the hydrogeochemical approach is conducted. The chemical composition of the groundwater is predominantly Ca-Mg-Cl, Na-HCO3, and Na-Cl. The results show that water-rock interaction, cation exchange processes, and marine effect are the main factors affecting groundwater mineralization. The majority of the analyzed samples exceed the WHO thresholds for human consumption, indicating the need for treatment before consumption.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Urban Studies
Daniel J. Rozell
Summary: Coastal cities' vulnerability assessments often overlook groundwater flooding caused by sea level rise, which differs from surface flooding. Cities with impermeable geology can drain and pump groundwater as a defense, while managed retreat may be the only option in highly permeable areas. Considering groundwater flooding is crucial for enhancing urban vulnerability assessments and developing realistic resilience strategies.
Review
Environmental Sciences
Shixuan Liu, Tianyuan Zheng, Yongxia Li, Xilai Zheng
Summary: With the increase of nitrogen input, groundwater contamination has become a global issue with significant impact on the environment and human health. Current research on controlling groundwater nitrogen contamination focuses only on indicator changes, unable to comprehend the cause and subsequent development of the contamination, posing challenges for environmental management.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Jingbo Gao, Shimao Wang, Zhiqin Li, Lei Wang, Zhujun Chen, Jianbin Zhou
Summary: Conversion from croplands to intensive orchards leads to increased nitrogen surplus in orchards, significant accumulation of nitrate in deep soil profiles, and serious contamination of groundwater; highlighting the vital role of deep soil nitrate storage in regulating the global nitrogen cycle.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Anner Paldor, Ryan S. Frederiks, Holly A. Michael
Summary: Coastal aquifers that provide freshwater to a large portion of the global population are facing salinization, and the current estimation methods may not be accurate due to neglecting the impact of cyclical forcings on average salinity distributions. Numerical modeling shows that both high-frequency fluctuations and low-frequency forcing can significantly alter average salinities, and considering these factors is crucial for accurate estimation of coastal aquifer salinities.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Yan Zhang, Tong Wu, Katie K. Arkema, Baolong Han, Fei Lu, Mary Ruckelshaus, Zhiyun Ouyang
Summary: This study assessed coastal vulnerability in the Bohai Economic Rim of China using a holistic framework, identifying spatial heterogeneity in vulnerability index distribution. Currently, 20% of the coastline with approximately 350,000 people is highly vulnerable to coastal hazards. Under future scenarios, it is estimated that the amount of highly threatened population will increase by 13-24% by the year 2100.
ENVIRONMENT INTERNATIONAL
(2021)
Review
Environmental Sciences
M. D. Covington, J. B. Martin, L. E. Toran, J. L. Macalady, N. Sekhon, P. L. Sullivan, A. A. Garcia, J. B. Heffernan, W. D. Graham
Summary: Earth's Critical Zone (CZ), influenced by underlying bedrock, is extensively studied for silicate-dominated landscapes but less so for carbonate landscapes. However, carbonate rocks cover around 15% of Earth's surface and provide essential resources. This study reviews the state of knowledge of the carbonate CZ, explores contrasts in different carbonate settings, and calls for integrative studies to develop a conceptual framework for the role of carbonates in the CZ.
Article
Environmental Sciences
Eleonora Carol, Santiago Perdomo, Maria del Pilar Alvarez, Carolina Tanjal, Pablo Bouza
Summary: The study explored the salinization processes affecting groundwater stored in Pleistocene and Holocene beach ridges on the northern Patagonian coast. It was found that the groundwater salinization of Pleistocene ridges is related to geological-geomorphological evolution, while freshwater lenses develop in Holocene beach ridges. Urban areas may experience slight water salinization due to intensive exploitation of water resources.
Review
Environmental Sciences
Fan Yang, Chao Jia, Haitao Yang, Xiao Yang
Summary: This paper analyzes the knowledge structure, hot topics, and trends in the field of groundwater salinization using bibliometric and visual analysis. The study finds that groundwater salinization has attracted global attention and research, with frequent collaborations among authors and identified hot topics and emerging trends. The outcomes of this study are significant for guiding future research on groundwater management and pollution control.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Water Resources
Jacob B. Clyne, Audrey H. Sawyer
Summary: This study analyzes continuous time series of water levels to investigate stream-groundwater connectivity and water table fluctuations. The results show that water level fluctuations are mainly influenced by streams and have an impact on the aquifer in most sites.
HYDROLOGICAL PROCESSES
(2022)
Article
Geosciences, Multidisciplinary
Mahfuzur R. Khan, Holly A. Michael, Edward W. Bresnyan, Winston Yu
Summary: This study presents a model-based analysis of the impacts of groundwater withdrawal on dry-period streamflow in the Kosi Fan region of India and Nepal. The simulations show that the current groundwater withdrawal has minimal effect on the dry-season flow of the rivers. Under a high-reduction scenario, the groundwater withdrawal only has a slight reduction in the dry-season baseflow, which is mitigated by the pumping-induced increase in rainfall recharge.
HYDROGEOLOGY JOURNAL
(2022)
Review
Environmental Sciences
Julia A. Cantelon, Julia A. Guimond, Clare E. Robinson, Holly A. Michael, Barret L. Kurylyk
Summary: With rising sea levels and increased frequency and intensity of storms, low-elevation coastal areas are at an increasing risk of seawater flooding. This flooding can lead to the salinization of coastal aquifers through vertical saltwater intrusion. However, vertical saltwater intrusion is often overlooked in coastal zone assessments. This review synthesizes previous studies on vertical saltwater intrusion and highlights the need for improved understanding, coordination, and education in addressing the vulnerability of coastal groundwater.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Zhongyuan Xu, Jayaram Hariharan, Paola Passalacqua, Elisabeth Steel, Austin Chadwick, Chris Paola, Anner Paldor, Holly A. Michael
Summary: This study investigates the vulnerability of coastal deltaic aquifers to seawater intrusion, contamination, and groundwater abstraction, as well as the impact of surface deposition changes on the distribution and transport of groundwater solutes. By simulating groundwater flow and solute transport under different contamination scenarios, the research reveals that the vulnerability of deltaic aquifers to seawater intrusion is correlated with sand fraction, and vertical transport of contaminants is influenced by channel stacking patterns.
WATER RESOURCES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Jayaram Hariharan, Paola Passalacqua, Zhongyuan Xu, Holly A. Michael, Elisabeth Steel, Austin Chadwick, Chris Paola, Andrew J. Moodie
Summary: Climate change raises sea levels globally, which has adverse effects on river deltas and coastal communities. This study uses a numerical model to simulate deltaic evolution under different sea-level rise trajectories, finding that surface and subsurface dynamics change with higher rates of sea-level rise. The trajectory and magnitude of sea-level rise impact delta surface evolution and subsurface connectivity. This work improves future prediction of delta evolution and subsurface changes as sea levels continue to rise.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2022)
Article
Engineering, Environmental
Xuan Yu, Joshua J. LeMonte, Junxia Li, Jason W. Stuckey, Donald L. Sparks, John G. Cargill, Christopher J. Russoniello, Holly A. Michael
Summary: Historical industrial activities have caused soil contamination at coastlines worldwide, which are susceptible to disruptions by climate change and rising sea levels. However, the effects of hydrologic dynamics on contaminant transportation in tidal environments have not been extensively studied. This research collected data from various sensors at a contaminated site near a freshwater tidal channel and found that seasonal groundwater interactions and sub-daily water level fluctuations in the channel contribute to varying redox conditions and contaminant concentrations. The findings highlight the importance of understanding the impacts of sea-level rise on the mobility of coastal solutes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Giovanna Nordio, Ryan Frederiks, Mary Hingst, Joel Carr, Matt Kirwan, Keryn Gedan, Holly Michael, Sergio Fagherazzi
Summary: Recent studies have mostly focused on the impact of large tropical cyclones on shorelines, disregarding the effects of less intense but more frequent events. This study analyzes the influence of offshore tropical storm Melissa on groundwater along the North America Atlantic coast. The findings show that Melissa led to a significant increase in groundwater level and specific conductivity, with a longer recovery time for conductivity. The study suggests that the increasing frequency of moderate storms will have a significant ecological impact on vegetated shorelines.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Mary C. C. Hingst, Rachel W. W. McQuiggan, Chelsea N. N. Peters, Changming He, A. Scott Andres, Holly A. A. Michael
Summary: Coastal agricultural zones are being affected by salinization caused by sea-level rise, leading to reduced crop yields and abandonment of farmland. This study implemented a monitoring network to understand the mechanisms and drivers of seawater intrusion, highlighting the significance of monitoring and stakeholder engagement in mitigating the effects of salinization and supporting coastal resilience.
Article
Engineering, Civil
Utkarsh Gangwal, A. R. Siders, Jennifer Horney, Holly A. Michael, Shangjia Dong
Summary: This study examines the accessibility of communities to critical facilities during flooding. The findings highlight the risk of severe facility access loss due to flood isolation, especially for vulnerable groups. Additionally, critical roads for post-flooding access to these facilities are identified.
SUSTAINABLE AND RESILIENT INFRASTRUCTURE
(2023)
Article
Engineering, Civil
Xiaolang Zhang, Audrey H. Sawyer, Kamini Singha
Summary: An increasing number of studies have used saline tracer injections and time-lapse electrical resistivity (ER) surveys to investigate solute exchange in the hyporheic zone. However, the reliability and resolution of ER surveys in the hyporheic zone have been rarely discussed. This study uses numerical modeling to evaluate the ability of ER imaging to resolve changes in saline tracer concentration in the hyporheic zone, and finds that the inversion process introduces smoothing and artifacts, leading to inaccurate measurements of the cross-sectional area of the tracer plume.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Environmental
Feng Pan, Kai Xiao, Yu Cai, Hailong Li, Zhanrong Guo, Xinhong Wang, Yan Zheng, Chunmiao Zheng, Benjamin Carlos Bostick, Holly A. Michael
Summary: Global warming and sea-level rise have significant effects on coastal mangrove ecosystems, particularly on the behavior of benthic crabs and their impact on sediment properties and material cycles. This study explores how crab bioturbation affects the movement of bioavailable arsenic (As), antimony (Sb), and sulfide in sediment-water systems, and how these processes are influenced by temperature and sea-level rise. The results indicate that crab burrowing enhances oxidizing conditions, leading to increased mobilization and release of Sb but sequestration of As by iron/manganese oxides. The study also highlights the spatial heterogeneity of labile sulfide, As, and Sb in bioturbated sediments, and the contrasting effects of warming and sea-level rise on benthic bioturbation and redox chemistry.
Article
Environmental Sciences
A. Marshall, X. Zhang, A. H. Sawyer, E. Wohl, K. Singha
Summary: The logjams in a stream create transient storage zones within the surface and subsurface of the stream, which is influenced by logjam distribution density, permeability, and discharge. Experimental flume studies and numerical simulations show that multiple logjams enhance hyporheic exchange and surface water storage. Understanding logjam characteristics is important for managing rivers in forested environments.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Zhongyuan Xu, Mahfuzur R. Khan, Kazi Matin Ahmed, Anwar Zahid, Jayaram Hariharan, Paola Passalacqua, Elisabeth Steel, Austin Chadwick, Chris Paola, Steven L. L. Goodbred Jr, Anner Paldor, Holly A. Michael
Summary: Groundwater is the primary water source in the Bengal Delta, but it is under threat from contamination. By using surface information to model subsurface features, the predictions of groundwater flow can be improved. The land surface features in active deltas play a significant role in evaluating groundwater vulnerability to contamination.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2023)
Article
Ecology
Damian L. Arevalo-Martinez, Amir Haroon, Hermann W. Bange, Ercan Erkul, Marion Jegen, Nils Moosdorf, Jens Schneider von Deimling, Christian Berndt, Michael Ernst Boettcher, Jasper Hoffmann, Volker Liebetrau, Ulf Mallast, Gudrun Massmann, Aaron Micallef, Holly A. Michael, Hendrik Paasche, Wolfgang Rabbel, Isaac Santos, Jan Scholten, Katrin Schwalenberg, Beata Szymczycha, Ariel T. Thomas, Joonas J. Virtasalo, Hannelore Waska, Bradley A. Weymer
Summary: For thousands of years, humans have been attracted to coastlines for their resource potential and as geopolitical centers. The supply and demand of potable water are crucial for water security in coastal communities, but the interaction between freshwater and saltwater in coastal settings is complicated by natural and human-driven environmental changes. Understanding groundwater fluxes across the land-sea continuum is important for (bio)geochemical budgets and the potential use of offshore freshened groundwater as a resource. Assessing land-ocean connectivity through groundwater requires a multidisciplinary approach and is relevant for climate change, pollution, and sustainable development goals.
Article
Geosciences, Multidisciplinary
Anner Paldor, Nina Stark, Matthew Florence, Britt Raubenheimer, Steve Elgar, Rachel Housego, Ryan S. Frederiks, Holly A. A. Michael
Summary: Ocean surges pose a global threat to coastal stability, and the evolution of surge-induced pore-pressure gradients can be studied through numerical hydrologic simulations. The study found that these gradients appear on the landward side of the advancing inundation line during the run-up stage and on the seaward side of the retreating inundation line during the receding stage.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)