Article
Engineering, Environmental
H. N. Hunter, C. J. B. Gowing, A. L. Marriott, J. H. Lacey, S. Dowell, M. J. Watts
Summary: This communication presents a validation approach using varve counting to improve the accuracy of Pb-210 measurement data and generate more precise chronologies. This is crucial for predicting environmental changes such as sedimentation rates, climate change, pollution pathways, and land degradation.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2023)
Article
Engineering, Civil
Jaehyun Lee, Weon Shik Han, Peter K. Kang, Seonkyoo Yoon, Sungwook Choung, Jeonghwan Hwang, Jehyun Shin
Summary: Understanding the transport of Cs-137 in porous and fractured aquifers is crucial for assessing the risk of nuclear accidents. This study investigates the transport of desorbed Cs-137 beneath a dam using a 2D aquifer model. The results show that the distribution coefficient (Kd) is a critical parameter controlling Cs-137 transport, while temperature has a relatively minor effect. Physical and chemical heterogeneity also significantly influence Cs-137 transport, leading to large variability in migration rates and annual doses.
JOURNAL OF HYDROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Feng Gu, Xinbao Zhang, Bing Ren, Minghua Zhou
Summary: A new model has been developed in this study to date recent silting soils in debris flow deposits based on changes in Pb-210(ex) concentrations in surface soil layers. The model was validated and showed good agreement with actual values.
Article
Multidisciplinary Sciences
Katrina L. Poppe, John M. Rybczyk
Summary: The study showed that restoration of tidal marshes in the Stillaguamish River estuary in Puget Sound not only maximized carbon accumulation, but also enhanced resilience to rising sea levels. After four years, the restored marsh had slightly lower sediment carbon stocks compared to adjacent natural marshes, but had nearly twice the carbon accumulation rates due to higher rates of accretion. Elevation change rates in the restored marsh were also greater than the current rate of sea level rise.
Article
Environmental Sciences
Sonam Priyadarshini Rout, Sivaprakasam Vasudevan
Summary: The pristine Himalayan Wetlands are facing endangerment due to increased sedimentation rate and anthropogenic encroachment. Human interference has resulted in faster sedimentation in recent years.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Biodiversity Conservation
Wenxian Sun, Xiaoyin Niu, Haowei Teng, Yanfei Ma, Longchao Ma, Yizhou Liu
Summary: The study revealed that eutrophication in Chaihe Reservoir in Kunming, China has worsened, with human activities contributing to increased input of organic carbon, nitrogen, and sulfur into the aquatic environment.
ECOLOGICAL INDICATORS
(2022)
Article
Chemistry, Analytical
N. Kuzmenkova, A. Rozhkova, A. Egorin, E. Tokar, E. Grabenko, K. Shi, V. Petrov, S. Kalmykov, X. Hou
Summary: Sediment cores from Lake Khanka (Xingkaihu) and Amur Bay were analyzed for Cs-137 and Pb-210 concentrations, mineralogical and elemental composition. The results showed that the investigated area is not contaminated, with maximum Cs-137 activity of 10 Bq/kg and inventory of 0.16 Bq/m(2). The sedimentation rate was estimated to be 1.6 mm/year in the eastern part of Lake Khanka and 0.43-0.5 mm/year in Amur Bay.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Environmental Sciences
A. C. Ruiz-Fernandez, J. A. Sanchez-Cabeza, M. Blaauw, L. H. Perez-Bernal, J. G. Cardoso-Mohedano, M. A. Aquino-Lopez, E. Keaveney, S. Giralt
Summary: The study of Santa Maria del Oro Lake in Mexico reveals the close relationship between sediment variations and human activities and climate change. The high sedimentation rates in the lake are mainly caused by erosion in the catchment area. Human settlement and agricultural practices play crucial roles in the conservation and management of the lake resources.
JOURNAL OF PALEOLIMNOLOGY
(2022)
Article
Environmental Sciences
Katarzyna Szarlowicz, Marcin Stobinski, Filip Jedrzejek, Barbara Kubica
Summary: The aim of this work was to estimate sedimentary conditions by analyzing the radionuclides deposited in sediment core samples taken from lakes surrounded by marsh-peat vegetation. The study found that these lakes are a valuable source of information, and the vertical distribution of radionuclides can be used to interpret the factors influencing the sedimentation process in recent years.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Multidisciplinary Sciences
Terumi Dohi, Yoshihito Ohmura, Kazuya Yoshimura, Takayuki Sasaki, Kenso Fujiwara, Seiichi Kanaizuka, Shigeo Nakama, Kazuki Iijima
Summary: The study found that the Cs-137 inventory in lichens from Fukushima was significantly higher than in adjacent barks, and that the distribution of radioactivity was heterogeneous in both lichens and barks. Lichens were able to capture fine particles, including radiocaesium particles, with radioactivity concentrated more towards their interiors.
Article
Chemistry, Analytical
V. M. Exposito-Suarez, J. A. Suarez-Navarro, P. Vacas-Arquero, A. Caro
Summary: The purpose of this study was to characterize the Molina de Aragon archaeological site in Guadalajara, Spain using gamma spectrometry. Different samples with historical influences were analyzed using gamma spectrometry and X-ray fluorescence to determine their chemical composition. Box-and-whisker plots, cluster analysis, and principal component analysis were used to study the activity concentration of radionuclides and evaluate sampling reproducibility. The results provided insights into the classification of areas based on different influences and identified least altered areas based on activity concentrations.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2023)
Article
Geosciences, Multidisciplinary
Peng Chen, Markus Czymzik, Zhongbo Yu, Ala Aldahan, Jinguo Wang, Peng Yi, Xiaolin Hou, Shouyan Guo, Minjie Zheng
Summary: Soil erosion has caused landscape problems in many parts of the world, especially in cold regions where permafrost conditions have changed due to climate warming. The Tibetan Plateau, strongly affected by global warming and human activities, has been a case of such erosion. Monitoring technologies, such as remote sensing and field surveys, have limitations in exploring soil erosion rates in this region due to resolution and disturbance factors.
Article
Geography, Physical
Caroline C. Clason, Will H. Blake, Nick Selmes, Alex Taylor, Pascal Boeckx, Jessica Kitch, Stephanie C. Mills, Giovanni Baccolo, Geoffrey E. Millward
Summary: The release of legacy contaminants in response to glacier retreat has not received enough attention yet. Evidence shows significantly augmented activities of fallout radionuclides in cryoconite in multiple regions of the global cryosphere. Future research should focus on the accumulation processes of radionuclides and other environmental contaminants in cryoconite.
Article
Geography, Physical
Giovanni Baccolo, Davide Abu El Khair, Massimiliano Nastasi, Monica Sisti, Chiara Ferre, Christine Alewell, Roberto Comolli
Summary: Soil mobilization in a first-order catchment of the Eastern Alps was investigated using fallout radionuclides (FRN). The distribution, spatial variability, vertical distribution, and relationships with pedological and topographical variables of FRNs were assessed. Results showed that erosion rates of up to 6 t ha(-1) yr(-1) were observed in the catchment, likely due to grazing. However, the commonly used FRN, Cs-137, was found to be unsuitable for estimating soil redistribution at this site, while Pb-210(xs.) provided reliable estimates in accordance with local morphology.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Environmental Sciences
Krishna Kumar Singh, Sivaprakasam Vasudevan
Summary: This study presents initial information on the sedimentation rate estimation for Lake Pykara. It utilized Cs-137 and Pb-210(ex) analysis to establish a chronological sequence of sediment core, determining an average sedimentation rate of 0.71 cm year(-1) and estimated the age of the lake to be around 514.08 years to 521.43 years.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2021)
Article
Environmental Sciences
Jiabi Du, Kyeong Park, Timothy M. Dellapenna, Jacinta M. Clay
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Oceanography
Guan-hong Lee, Hyun-Jung Shin, Young Taeg Kim, Timothy M. Dellapenna, Kuk Jin Kim, Joshua Williams, Seok-Yun Kim, Steven Miguel Figueroa
Correction
Environmental Sciences
Jiabi Du, Kyeong Park, Timothy M. Dellapenna, Jacinta M. Clay
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Geosciences, Multidisciplinary
Samantha C. Carter, Elizabeth M. Griffith, Peter D. Clift, Howie D. Scher, Timothy M. Dellapenna
GEOLOGICAL MAGAZINE
(2020)
Article
Environmental Sciences
Timothy M. Dellapenna, Christena Hoelscher, Lisa Hill, Mohammad E. AlMukaimi, Anthony Knap
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Geosciences, Multidisciplinary
Joseph A. Carlin, Kathryn M. Schreiner, Timothy M. Dellapenna, Andrew McGuffin, Richard W. Smith
Summary: This study investigated event sedimentation within the Texas Mud Blanket (TMB) and identified several potential event deposits, highlighting the TMB as a potential archive for event deposits over multiple years. The event-dominated sedimentation regime enhances long-term carbon burial, potentially increasing current estimates of carbon burial significantly in distal shelf depocenters. The role of distal shelf depocenters as organic carbon burial hotspots may expand in the future with increasing intensity and frequency of extreme events due to climate change.
Correction
Environmental Sciences
Krisa Camargo, Jose L. Sericano, Sharmilla Bhandari, Christena Hoelscher, Thomas J. McDonald, Weihsueh A. Chiu, Terry L. Wade, Timothy M. Dellapenna, Yina Liu, Anthony H. Knap
MARINE POLLUTION BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
E. Wurgaft, Z. A. Wang, J. H. Churchill, T. Dellapenna, S. Song, J. Du, M. C. Ringham, T. Rivlin, B. Lazar
Summary: The study investigated the effects of heterogeneous reactions between river-borne particles and the carbonate system in the plumes of the Mississippi and Brazos rivers. The results showed significant removal of dissolved inorganic carbon (DIC) and total alkalinity (TA) due to these reactions, with heterogeneous reactions accounting for a significant fraction of DIC and TA removal in the plume waters. Laboratory experiments confirmed these findings, suggesting that heterogeneous reactions may be an important controlling mechanism of the seawater carbonate system in particle-rich coastal areas.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Ecology
Ian P. Davis, Timothy M. Dellapenna, Gary E. Maale, Francis P. Gelwick, Frederick C. Weltz, Randall W. Davis
Summary: Identifying factors influencing animal population density can help understand spatial and temporal variations and determine when a population reaches carrying capacity K due to food resources. This study estimated K for Simpson Bay, Alaska based on prey abundance and sea otters' consumption, suggesting sea otters have reached K. Understanding population regulation factors is complex and requires long-term monitoring for complete resolution.
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2021)
Article
Environmental Sciences
Jiabi Du, Kyeong Park, Christine Jensen, Timothy M. Dellapenna, Weifeng G. Zhang, Yong Shi
Summary: Under a warming climate, extreme precipitation events are projected to increase, posing threats to coastal ecosystems. Hurricane Harvey caused a significant increase in oyster mortality in Galveston Bay, with low-salinity exposure identified as the main cause. The study highlights the vulnerability of coastal ecosystems to extreme events and the importance of considering climate change impacts on oyster reefs globally.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Nicole Schmidt, Timothy Dellapenna, Peng Lin
Summary: The study found that the age and proportion of newly suspended sediments in the bay vary with location, potentially being carried away by cold fronts. Suspended sediments with longer residence times may increase the exposure time of living organisms to contaminants.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Amanda M. Lopez, Jessica N. Fitzsimmons, Hannah M. Adams, Timothy M. Dellapenna, Alan D. Brandon
Summary: Galveston Bay is an anthropogenic-influenced estuary with high concentrations of heavy metals in sediment, especially in the eastern bay. Temporal variations in sediment metal concentrations are primarily controlled by river discharge, with stable levels of some metals in the 20th century and increasing levels of others in recent years.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Krisa Camargo, Mary Ann Vogelbein, Jennifer A. Horney, Timothy M. Dellapenna, Anthony H. Knap, Jose L. Sericano, Terry L. Wade, Thomas J. McDonald, Weihsueh A. Chiu, Michael A. Unger
Summary: This study tested the field application of the KinExA Inline Biosensor in characterizing the PAH profiles of soils and sediments in Galveston Bay and the Houston Ship Channel (GB/HSC) and in the Elizabeth River. The biosensor showed potential for future DR2 efforts in characterizing PAH contamination and aiding in prioritization of environmental sample analysis.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Timothy M. Dellapenna, Christena Hoelscher, Lisa Hill, Lindsay Critides, Victoria Salgado (Bartlett), Mason Bell, Mohammad E. Al Mukaimi, Jaibi Du, Kyeong Park, Anthony H. Knap
Summary: Hurricane Harvey caused massive flooding of the Texas coast, leading to the deposition of significant amounts of sediment and mercury into Galveston Bay and its tributaries. The slow release of floodwaters from reservoirs resulted in prolonged trapping and dispersal of contaminants, highlighting the potential long-term impacts of such events on urban estuaries worldwide.
ESTUARIES AND COASTS
(2022)
Article
Environmental Sciences
Krisa Camargo, Jose L. Sericano, Sharmilla Bhandari, Christena Hoelscher, Thomas J. McDonald, Weihsueh A. Chiu, Terry L. Wade, Timothy M. Dellapenna, Yina Liu, Anthony H. Knap
Summary: The study found a slight increase in PAH concentrations in sediment post-Hurricane Harvey in Galveston Bay and the Houston Ship Channel, with combustion as the likely source. While none of the detected PAHs exceeded Sediment Quality Guideline values, further attention is needed on changes in different sources of pollution.
MARINE POLLUTION BULLETIN
(2021)