Article
Environmental Sciences
Emily A. Haugen, Bryant C. Jurgens, Jose A. Arroyo-Lopez, George L. Bennett
Summary: In the San Joaquin Valley, California, around 10% of drinking water wells have arsenic concentrations exceeding the US maximum contaminant level, with trends towards decreasing arsenic concentrations despite high initial levels. Factors such as high pH and oxic groundwater derived from agricultural recharge play a role in arsenic mobility. Human-altered flow systems can both positively and negatively impact the natural geochemical character of water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Giovanni Castaldo, Ate Visser, Graham E. Fogg, Thomas Harter
Summary: The study focuses on how groundwater travel time and recharge source and mechanism influence nitrate concentrations in domestic wells in SVM, CA. Results show a decreasing trend in nitrates with groundwater travel time and well depth, with wells closer to rivers having lower nitrate concentrations due to river water recharge. This suggests that irrigation with river water also dilutes nitrate concentrations in groundwater, which may be useful for remediation strategies.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Agronomy
Khaled M. Bali, Abdelmoneim Zakaria Mohamed, Sultan Begna, Dong Wang, Daniel Putnam, Helen E. Dahlke, Mohamed Galal Eltarabily
Summary: Agricultural Managed Aquifer Recharge (Ag-MAR) is a sustainable practice of recharging depleted aquifers using excess precipitation during winter on agricultural fields. This study used the HYDRUS-2D model to estimate the net recharge in an alfalfa field in Parlier, California. Results showed that winter recharge after full irrigation in summer resulted in significant groundwater recharge, amounting to 85-89% of the applied irrigation water. Mid-summer deficit irrigation treatments also contributed to groundwater recharge, accounting for 76-79% of the applied irrigation water during winter flooding periods.
AGRICULTURAL WATER MANAGEMENT
(2023)
Article
Environmental Sciences
Linh Hoang, James P. S. Sukias, Valerio Montemezzani, Chris C. Tanner
Summary: Nitrogen loading from diffuse agricultural sources is a major water-quality problem worldwide. Constructed wetlands have proven to be effective in treating runoff and drainage from agricultural lands. This study used a catchment-wetland modelling approach to estimate and quantify the nitrogen input loads into a wetland and evaluate its removal efficiency. The results showed that the Owl Farm constructed wetland had a high capacity for nitrate-N removal, with an average removal rate of 61%. However, the efficiency varied with the inflow from the catchment, with higher removal rates during low-flow periods and slightly lower rates during high-flow periods.
Article
Mineralogy
Ronald C. Peterson, Robert C. Graham, Jarel O. Ervin, Igor S. Kozin, James O. Sickman, Krassimir N. Bozhilov, Joel W. Reid
Summary: Sveite samples from Venezuela and California share similar X-ray diffraction patterns and chemical compositions, with the main difference being the absence of significant chlorine and sulfate in the California sample. Isotopic analysis suggests that the nitrate in the Venezuelan sample was affected by denitrification, while the nitrate in the California sample may have a different source. Overall, the nitrate in California's Sveite is similar to nitrate found in acidic soils, indicating a biogenic source.
CANADIAN MINERALOGIST
(2021)
Article
Green & Sustainable Science & Technology
Nigel W. T. Quinn, James D. Oster
Summary: The SGMA and CVSALTS initiatives aim to address issues of groundwater over-pumping and river salination in California through modern technology and policy actions. Mobilization of resources by the CDWR has helped develop robust quantitative understanding but also revealed flaws in conceptual models. Local leadership and advocacy play a crucial role in achieving long-term goals.
Article
Engineering, Environmental
Solianna A. Herrera, Glenn S. Diskin, Charles Harward, Glen Sachse, Stephan F. J. De Wekker, Melissa Yang, Yonghoon Choi, Armin Wisthaler, Derek Mallia, Sally E. Pusede
Summary: N2O emissions are uncertain and show high spatiotemporal variability, making individual observations difficult to upscale. This study calculates N2O emission rates using different methods and finds important patterns such as the significance of wintertime emissions from animal agriculture and potentially higher N2O emissions during the daytime than at night.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Benjamin C. Schulze, Ryan X. Ward, Eva Y. Pfannerstill, Qindan Zhu, Caleb Arata, Bryan Place, Clara Nussbaumer, Paul Wooldridge, Roy Woods, Anthony Bucholtz, Ronald C. Cohen, Allen H. Goldstein, Paul O. Wennberg, John H. Seinfeld
Summary: State inventories may underestimate methane emissions from dairy operations in California. Airborne flux measurements in the southern San Joaquin Valley show higher methane emissions from dairy farms compared to inventory estimates. This highlights the need for accurate emission inventories and further investigation of the meteorological factors influencing these emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Peng Sun, Ryan N. Farley, Lijuan Li, Deepchandra Srivastava, Christopher R. Niedek, Jianjun Li, Ningxin Wang, Christopher D. Cappa, Sally E. Pusede, Zhenhong Yu, Philip Croteau, Qi Zhang
Summary: The study deployed a ToF-ACSM instrument to continuously monitor PM2.5 in the San Joaquin Valley, revealing significant seasonal variations in PM2.5 composition and sources. Wood burning and nitrogen oxide oxidation were major contributors in winter, while agricultural activities and wildfires were main causes of PM pollution in autumn.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Rebecca A. Tisherman, Robert J. Rossi, Seth B. C. Shonkoff, Dominic C. Digiulio
Summary: Research reveals that groundwater near produced water disposal pond facilities in the southern San Joaquin Valley contains elevated levels of uranium contamination, posing a potential threat to groundwater resources and agricultural production in the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Ryan Smith
Summary: The San Joaquin Valley in California has experienced significant subsidence over the past century, with the most affected areas shifting from west to south. This study analyzes head records and identifies the stress history and declining groundwater levels as major factors contributing to subsidence. It emphasizes the need for active groundwater management and accurate long-term data for deformation modeling.
WATER RESOURCES RESEARCH
(2023)
Article
Biochemistry & Molecular Biology
Robert Wagner, Liliam Montoya, Cheng Gao, Jennifer R. Head, Justin Remais, John W. Taylor
Summary: Understanding the dynamics of airborne fungi is important for preventing fungal diseases, especially in regions like the San Joaquin Valley in California where airborne fungus Coccidioides is responsible for the most important fungal disease. The study found that the airborne fungal community in the region is distinct from the soil fungal community, and that airborne fungi are subject to dispersal limitation and cyclical intra-annual patterns of community composition.
Article
Environmental Sciences
Valerie Carranza, Brenna Biggs, Deanne Meyer, Amy Townsend-Small, Ranga Rajan Thiruvenkatachari, Akula Venkatram, Marc L. Fischer, Francesca M. Hopkins
Summary: This study presents seasonal atmospheric measurements of delta C-13(CH4) from dairy farms in California, using it to characterize emissions from enteric fermentation. The findings show that there are significant differences in the isotopic signature of CH4 from different cattle production groups based on their diets. Measurements of delta C-13(CH4) could help improve the understanding of the contributions from different emission sources to the CH4 budget.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Environmental Sciences
Wesley R. Neely, Adrian A. Borsa, Jennifer A. Burney, Morgan C. Levy, Francesca Silverii, Michelle Sneed
Summary: This study analyzes surface deformation in California's San Joaquin Valley using radar and positioning data, showing that subsidence rates were twice as high in 2016 compared to 2017, possibly due to increased groundwater pumping. In the wetter 2017 water year, the locations of greatest subsidence migrated outward, possibly reflecting a surplus of water supply in low-lying areas. Patterns in seasonal deformation reveal entry points and potential pathways for groundwater recharge.
WATER RESOURCES RESEARCH
(2021)
Article
Nutrition & Dietetics
Tatum M. Sohlberg, Emma C. Higuchi, Valeria M. Ordonez, Gabriela V. Escobar, Ashley De La Rosa, Genoveva Islas, Cecilia Castro, Kenneth Hecht, Christina E. Hecht, Janine S. Bruce, Anisha I. Patel
Summary: School-based nutrition programs are crucial in reducing food insecurity. However, the COVID-19 pandemic has negatively affected students' school meal participation. This study aimed to analyze parent perspectives on school meals during COVID-19 to improve program participation. Photovoice methodology was used to explore parental perception in a Latino farmworker community in California. The findings revealed that parents acknowledged the benefits of school meal distribution in addressing food insecurity, but highlighted concerns over the unappealing and unhealthy nature of the meals, leading to decreased participation. The study also emphasized the importance of grab-and-go style meals during the pandemic closures.
Article
Engineering, Environmental
S. Gulati, A. A. Stubblefield, J. S. Hanlon, C. L. Spier, M. K. Camarillo, W. T. Stringfellow
WATER SCIENCE AND TECHNOLOGY
(2016)
Article
Environmental Sciences
William T. Stringfellow, Mary Kay Camarillo, Jeremy K. Domen, Whitney L. Sandelin, Charuleka Varadharajan, Preston D. Jordan, Matthew T. Reagan, Heather Cooley, Matthew G. Heberger, Jens T. Birkholzer
ENVIRONMENTAL POLLUTION
(2017)
Review
Green & Sustainable Science & Technology
Mary Kay Camarillo, William T. Stringfellow
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2018)
Article
Multidisciplinary Sciences
William T. Stringfellow, Mary Kay Camarillo, Jeremy K. Domen, Seth B. C. Shonkoff
Article
Engineering, Environmental
M. Ekrem Karpuzcu, Ali Inci, Mihriban H. Goktas, Izzet Ozturk
WATER SCIENCE AND TECHNOLOGY
(2019)
Article
Environmental Sciences
Cagri Sahin, M. Ekrem Karpuzcu
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Green & Sustainable Science & Technology
Mahmut Ekrem Karpuzcu, Malhun Fakioglu, Izzet Ozturk
Summary: The study revealed that Istanbul's main drinking water reservoirs are at risk of eutrophication or already in a eutrophic state, with recommendations to reduce nonpoint source loads for Omerli and Buyukcekmece Reservoirs, and additional measures to mitigate internal eutrophication for Terkos Reservoir. The results provide insight into management and control scenarios to prevent impacts of eutrophication in these reservoirs.
CLEAN-SOIL AIR WATER
(2021)
Article
Ecology
Fatma Nihan Dogan, Mahmut Ekrem Karpuzcu
Summary: This study used the SWAT model to investigate the effects of land use/cover changes on hydrological components, finding that scenarios of urbanization and expansion in agricultural land led to significant increases in surface runoff, particularly during dry months. Controlling the overall response of hydrological systems to LUCC relies on a better understanding of surface runoff processes.
Article
Environmental Sciences
Rahime Iclal Birtek, Mahmut Ekrem Karpuzcu, Izzet Ozturk
Summary: Increase in the contamination of the aquatic environments is a global challenge. A year-long monitoring was conducted in the influents and effluents of four largest wastewater treatment plants in Istanbul. The results showed the presence of various priority substances, including pesticides, PAHs, VOCs, DLCs, alkylphenols, phthalates, and metals.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Engineering, Multidisciplinary
Malhun Fakioglu, Mahmut Ekrem Karpuzcu, Ismail Toroz, Fatih Yildiz, Izzet Ozturk
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
(2020)
Article
Engineering, Multidisciplinary
Fatma Nihan Dogan, Mahmut Ekrem Karpuzcu
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
(2019)
Article
Chemistry, Analytical
William T. Stringfellow, Mary Kay Camarillo
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2019)
Article
Engineering, Multidisciplinary
Malhun Fakioglu, Mahmut Ekrem Karpuzcu, Izzet Ozturk
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI
(2018)
Meeting Abstract
Chemistry, Multidisciplinary
Cagri Sahin, Mahmut Ekrem Karpuzcu
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2017)
Meeting Abstract
Chemistry, Multidisciplinary
William Stringfellow, Mary Kay Camarillo, Nicholas Spycher, Peter Nico
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2017)
Article
Ecology
Alexander M. Cancelli, Frank A. P. C. Gobas
Summary: A mechanistic model was developed to assess the removal efficiency of pollutants in a wetland system, particularly in oil sands process-affected water (OSPW). The model simulated wetland mechanisms of chemical removal and showed that sustained wetland treatment is feasible. It is a helpful tool to evaluate the feasibility of treatment systems and to assess trade-offs in wetland design and operation.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Prakash Singh Thapa, Hiromu Daimaru, Seiji Yanai
Summary: This study assessed the vegetation recovery and erosion condition in a landslide area in central Japan. The results show that the upper slope, where reforestation activities were implemented, has seen significant vegetation recovery and no significant erosion, while the lower slope lacks vegetation and has experienced continued erosion.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Mike Jerauld, Forrest Dierberg, Thomas DeBusk, Scott Jackson, Kevin Grace, John Juston
Summary: The Everglades Stormwater Treatment Areas (STAs) are constructed wetlands built to remove phosphorus (P) from agricultural and urban runoff in support of Everglades restoration. Research shows that the levels of calcium (Ca) and alkalinity (Alk) have an impact on phosphorus removal in these wetlands.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Kalindhi Larios, Stefan Gerber, Rafael Munoz-Carpena, Patrick Inglett, K. Ramesh Reddy, Michael Chimney
Summary: This study modeled the phosphorus biogeochemical dynamics in one of the best performing Everglades treatment wetlands and found that the complexity of the hydrological system significantly affected the simulated water column P concentration. The modeling tool developed in this study can guide future data collection and optimization efforts for treatment wetlands in the Everglades.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Jing Hu, Benjamin Baiser, R. Thomas James, K. Ramesh Reddy
Summary: This study examined the long-term phosphorus retention in Stormwater Treatment Areas (STAs) and identified the factors influencing their performance. The results showed that the operational performance of STAs improved over time. There were notable differences among individual STAs, with the co-precipitation of phosphorus with calcium playing a critical role in one of the STAs. This highlights the complexity of phosphorus removal in STAs and the need for site-specific management strategies.
ECOLOGICAL ENGINEERING
(2024)
Article
Ecology
Odi Villapando, K. R. Reddy, J. King
Summary: The biogeochemical response to different flow conditions within two parallel flow-ways in Everglades Stormwater Treatment Area (STA)-2 was studied. It was found that there was a gradual decrease in the total phosphorus (TP) concentration from inflow to outflow for both emergent aquatic vegetation (EAV) and submerged aquatic vegetation (SAV) dominated systems, with EAV showing a higher reduction rate. Significant increase in TP concentration was observed in the SAV system under no flow condition, possibly due to the production of particulate phosphorus (PP) through various mechanisms.
ECOLOGICAL ENGINEERING
(2024)