环境科学与生态学最新文献

{"title":"Applications, challenges and prospects on efficient and reliable bacterial-algal symbiosis system for wastewater treatment: A systematic review","authors":"Feifan Wu, Fanying Kong, Bing-Feng Liu, Xueting Song, Nan-Qi Ren, Hong-Yu Ren","doi":"10.1016/j.jclepro.2025.145605","DOIUrl":"https://doi.org/10.1016/j.jclepro.2025.145605","url":null,"abstract":"Human activities have increased pollutant emissions and damaged ecosystems. The use of microalgae-bacteria symbiosis systems in dealing with the adverse effects of pollutants has gradually attracted people's attention. Compared with single bacteria or algae, the synergistic effect between bacteria and algae could enhance the removal ability of pollutants and the adapt to the environment. However, high environmental requirements and challenges such as maintaining stable algal symbiotic system activity under fluctuating wastewater composition have potentially limited their widespread application. Therefore, this review focused mainly on the bacterial-algal system and summarized its role in urban, industrial and aquaculture wastewater, as well as its outstanding advantages in biomass energy production. The main influencing factors were explored, and the advantages and disadvantages of different types of reactors were compared. Moreover, this paper highlighted the system's superior sustainability, efficient removal of emerging pollutants and heavy metals, and the dual benefits of carbon emission reduction and resource recovery, thereby solving these problems. Comprehensive analysis showed that the use of bacteria and algae systems to treat wastewater was significantly better than the traditional activated sludge method. The bacterial and algal system exhibited strong adaptability to different water qualities and could produce mainstream biomass energy such as biohydrogen, biodiesel and bioethanol. In addition, environmental factors played important roles in the efficient operation of bacterial and algal systems. This review was dedicated to accelerating the mature application of bacterial-algal systems in industry.","PeriodicalId":349,"journal":{"name":"Journal of Cleaner Production","volume":"34 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring marine pollution effects through targeted environmental DNA (eDNA) testing in the Pacific northwest","authors":"Neha Acharya-Patel ,&nbsp;Karen Cram ,&nbsp;Emma T. Groenwold ,&nbsp;Hajeong Lee ,&nbsp;Abigail G. Keller ,&nbsp;Breanna Bomback ,&nbsp;Shirley Lyons ,&nbsp;Rene L. Warren ,&nbsp;Lauren Coombe ,&nbsp;Christopher J. Lowe ,&nbsp;Lauren C. Bergman ,&nbsp;Farida Bishay ,&nbsp;Inanc Birol ,&nbsp;Tara A. Macdonald ,&nbsp;Caren C. Helbing","doi":"10.1016/j.marpolbul.2025.118036","DOIUrl":"10.1016/j.marpolbul.2025.118036","url":null,"abstract":"<div><div>Globally, coastal waters experience degradation from pollution associated with multiple discharges, including industrial and agricultural runoff, and municipal wastewater. Certain benthic infaunal taxa are tolerant of high nutrient input and anoxic conditions, while others are sensitive to these conditions. Using these indicator taxa as proxies for assessing organic enrichment is well established to characterize subsequent pollution impacts. Conventional assessment of macroinfauna involves the detailed analysis of each individual specimen within a sample by taxonomic experts, a resource intensive process. As an alternative, we developed sensitive quantitative polymerase chain reaction (qPCR) assays to detect these indicator taxa in a scalable and reliable way. Using whole genome shotgun sequencing, we generated full mitogenome sequences of selected indicator macroinfaunal polychaetes routinely used for monitoring programs in Pacific Northwest marine environments. These sequences were used to design five new, rigorously validated environmental DNA (eDNA) assays capable of detecting low levels of DNA that can be isolated from environmental samples. For nine sites at a wastewater treatment plant outfall in Vancouver, British Columbia, we tested three eDNA sample collection types: active filtration, a passive dip filter from water containing collected macroinfauna, and active filtration from water collected near the sea floor. Generalized linear models indicated that eDNA signal strength correlated with organism count particularly with passive dip sample collection type. eDNA occupancy modelling techniques estimated detection probabilities corresponding with organism count. The present study emphasizes the value of integrating eDNA into marine outfall monitoring efforts to enhance the assessment of environmental effects.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"216 ","pages":"Article 118036"},"PeriodicalIF":5.3,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Remediation of sulfonamide antibiotic-containing wastewater by constructed wetlands: Importance and action mechanism of plants","authors":"Tong Zhou ,&nbsp;Changzhou Yan ,&nbsp;Ling Zhang ,&nbsp;Guohui Zhang ,&nbsp;Hongda Fang","doi":"10.1016/j.jenvman.2025.125520","DOIUrl":"10.1016/j.jenvman.2025.125520","url":null,"abstract":"<div><div>Constructed wetlands (CWs) have been proved to be effective in treating sulfonamide antibiotics (SAs) wastewater. Nevertheless, as an essential element in CWs, the significance of plants, continues to be a topic of controversy. In this study, CWs with two different plant species were taken as the research object to investigate their treatment performance, in order to understand the impact of plants on the treatment of SAs wastewater in CWs and to discover the underlying action mechanisms. Experiment results showed that plants played an important role in the CWs, and significantly improved the efficiency of wastewater treatment, with average removal rates for conventional nutrients (COD, NH₄⁺-N, NO₃⁻-N and TP) ranging from 73.69 % to 98.92 %, surpassing the non-plant control group (52.16 %–80.70 %). Similarly, for SAs, the removal efficiency in the plant-treated group was 74.15 %–83.67 %, higher than that in the non-plant control group (65.42 %–70.14 %). Although, as time passed, the efficacy of CWs had slightly decreased, but the rate of pollutant removal remained consistently over 60 %. Further analysis showed that plants promoted the removal of SAs through various mechanisms such as plant uptake, microbial degradation and substrate adsorption. Plants had the ability to absorb SAs from wastewater and eliminated them through metabolism or accumulation. Additionally, plants can improve soil enzyme activity to facilitate microbial degradation, indirectly promoting SAs removal. It's worth noting that most SAs can be degraded through plant metabolism after being absorbed by plants, while only a minority of SAs accumulated in plants in the form of parent compounds. Furthermore, the efficacy of CWs in treating wastewater differed between selected plant species. Specifically, <em>Iris pseudacorus</em> showed a higher purifing potential than <em>Scirpus validus</em>. These results revealed the effect of plants on the treatment of SAs wastewater in CWs, and provided a reference for the practical application of antibiotic wastewater removal by CWs.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"383 ","pages":"Article 125520"},"PeriodicalIF":8.0,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of phloem transport of foliar-absorbed Cd in wheat","authors":"Liping Li ,&nbsp;Liping Wang ,&nbsp;James A. Ippolito ,&nbsp;Weiqin Xing ,&nbsp;Li Ma ,&nbsp;Kunyan Qiu ,&nbsp;Junxiao Jiang","doi":"10.1016/j.scitotenv.2025.179496","DOIUrl":"10.1016/j.scitotenv.2025.179496","url":null,"abstract":"<div><div>The transport pathway of foliar absorbed Cd in wheat has not been clarified. Hydroponically raised wheat seedling stems were steam girdled to disrupt phloem transport, then the leaves were exposed to Cd solutions (40 or 60 mg L⁻¹) containing 20 mg L⁻¹ Rb (a phloem transport indicator) for 16 h. Plants were harvested 7 days later and divided into roots and leaves, while the stem was divided into two parts above and below the girdling location, with phloem sap collected from the upper part. Samples were analyzed for Cd, Rb, Cu, Zn and Mn concentrations; root glutathione concentration was also analyzed to investigate Cd transport and its effect on other metals. Girdling increased leaf Cd concentrations by &gt;2 folds, reduced root Cd and Rb concentrations by ∼50 %, reduced root glutathione concentration by 21.4 %, and phloem sap Rb concentrations of the girdled plants were 30.8–63.1 % greater than the ungirdled treatments. Root to leaf Cd concentration ratios were in the range of 0.064–0.443, and girdled treatments had lower values than the ungirdled treatments. Negative correlations were found between root Cd and leaf Mn and Cu concentrations in the ungirdled treatments, but not in the girdled treatments. These results indicate that phloem transport plays an important role in the transport of leaf-absorbed Cd in wheat, with leaf absorbed Cd having high mobility. These findings are important for discerning Cd uptake and transport in plants found living in Cd-contaminated conditions.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"979 ","pages":"Article 179496"},"PeriodicalIF":8.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of heterogeneous Fenton-like reaction with modified zeolite for removal of antibiotics, antibiotic-resistant bacteria, and antibiotic-resistant genes from swine farm wastewater","authors":"Athitaya Changduang ,&nbsp;Parinda Thayanukul ,&nbsp;Patiparn Punyapalakul ,&nbsp;Tawan Limpiyakorn","doi":"10.1016/j.jenvman.2025.125486","DOIUrl":"10.1016/j.jenvman.2025.125486","url":null,"abstract":"<div><div>The heterogeneous Fenton-like reaction with modified zeolite was introduced for the removal of antibiotics, antibiotic-resistant bacteria (ARB), and antibiotic-resistant genes (ARGs) to reduce environmental impact of the substance residues in swine farm effluent. The heterogeneous Fenton-like reaction with 100 g/L of the modified zeolite and 2 mM H₂O₂ could completely remove amoxicillin (AMX), tetracycline (TC), and tiamulin (TIA) in the swine farm effluent within 30 min. However, the antibiotic removal in the swine farm effluent was slower than in the ultrapure water. The heterogeneous Fenton-like reaction removed approximately 45–60% of dissolved organic carbon (DOC) and reduced the dissolved organic matter (DOM) sizes in the swine farm effluent. The large molecular size humic-like DOM co-existing in the swine farm effluent could probably decelerate the antibiotic removal via competitive adsorption and oxidation. To inactivate high-tolerant AMX-resistant <em>E. coli</em>, the heterogeneous Fenton-like reaction required 3-fold less exposure time than the H₂O₂ oxidation. No regrowth of the high-tolerant AMX-resistant <em>E. coli</em> was observed when the exposure time of the heterogeneous Fenton-like reaction was longer than 6 h. The heterogeneous Fenton-like reaction required the exposure time of 24 h to reduce the <em>bla</em>TEM genes, the AMX-resistant genes, of the high-tolerant AMX-resistant <em>E. coli</em> to the level of lower than the limit of detection. The results suggest that different reaction times are required for the removal of antibiotics (within 30 min), ARB (over 6 h), and ARGs (within 24 h). Furthermore, the heterogeneous Fenton-like reaction with the modified zeolite is a promising technology for sequential and efficient removal of antibiotics, ARB, and ARGs residues in swine farm effluent before being discharged into the environment.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"384 ","pages":"Article 125486"},"PeriodicalIF":8.0,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial communities and fatty acid markers across acidification and eutrophication extremes in a river influenced by mining activities","authors":"Germán A. Kopprio ,&nbsp;Michael Hupfer ,&nbsp;Martin Graeve ,&nbsp;Susan Mbedi ,&nbsp;Sarah Sparmann ,&nbsp;Tobias Goldhammer","doi":"10.1016/j.scitotenv.2025.179473","DOIUrl":"10.1016/j.scitotenv.2025.179473","url":null,"abstract":"<div><div>Microbial communities in combination with fatty acid and isotopic markers were studied seasonally to assess the effects of acid mine drainage (AMD) and nutrient loads in the Spree river. Negative values of δ¹⁵N, the bacterial and detrital markers 18: 1(n-7) and 18:1(n-9), pH values ∼3 and bacteria of the genera <em>Ferrovum</em>, <em>Thiomonas</em>, <em>Acidocella</em>, <em>Acidiphilum</em>, <em>Syderoxydans</em> and <em>Galionella</em> were characteristic of the AMD extreme. Potential iron-oxidizers may produce ferric ions and their precipitates may influence biogeochemical processes, while potential sulfur-oxidizers may contribute to elevated sulphate concentrations and challenge drinking water production in the Spree catchment. In this river, eutrophication was linked with polyunsaturated fatty acids (PUFA) enrichment and not with PUFA depletion as occurs in other freshwater systems. Elevated concentrations and proportions of PUFA as well as higher relative sequence abundance of cyanobacteria were characteristic of the highly eutrophic station, particularly during the phytoplankton bloom. The 18:5(n-3) from flagellates or dinoflagellates may indicate lipid anabolism and trophic upgrading processes. The dominance of the classes Bacteroidia, Gammaproteobacteria and Actinobacteria suggested eutrophic and changing hydrological conditions in the river. The microbial communities were better markers of seasonality than the biogeochemical markers and their combination offers an excellent resolution for the study of the ecology and biogeochemistry of water courses. The expected decreased runoff under climate-driven scenarios may worsen the AMD pollution and eutrophication problems and signify a considerable challenge for water management.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"979 ","pages":"Article 179473"},"PeriodicalIF":8.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental and clinical impacts of antibiotics’ sub-minimum inhibitory concentrations on the development of resistance in acinetobacter baumannii","authors":"Bipin Yadav ,&nbsp;Dilip D. Karad ,&nbsp;Kiran R. Kharat ,&nbsp;Nilesh Makwana ,&nbsp;Anjali Jaiswal ,&nbsp;Richa Chawla ,&nbsp;Meenakshi Mani ,&nbsp;Hathorkhi H. Boro ,&nbsp;Prashant R. Joshi ,&nbsp;Dhanraj P. Kamble ,&nbsp;Corinne Mercier ,&nbsp;Arun S. Kharat","doi":"10.1016/j.scitotenv.2025.179521","DOIUrl":"10.1016/j.scitotenv.2025.179521","url":null,"abstract":"<div><div><em>Acinetobacter baumannii</em> has emerged as a critical nosocomial and environmental pathogen associated with high mortality rates and alarming levels of antibiotic resistance. The World Health Organization has classified <em>A. baumannii</em> as a top-priority pathogen due to its ability to rapidly acquire and disseminate resistance mechanisms. Prevalent in environmental reservoirs such as hospital effluents, agricultural runoff and pharmaceutical effluents, antibiotics’ sub-minimum inhibitory concentrations (sub-MICs) drive resistance evolution in <em>A. baumannii</em>, posing challenges to treatment and public health strategies. This review examines the role of antibiotics’ sub-MICs in driving resistance in <em>A. baumannii</em> across environmental and clinical contexts. Antibiotics’ sub-MICs enhance bacterial resistance by inducing genetic and phenotypic adaptations. These include upregulated efflux pump activities, biofilm formation, horizontal gene transfers, and altered gene expression, enabling <em>A. baumannii</em> to persist in adverse conditions. Environmental reservoirs further exacerbate resistance, with antibiotics’ sub-MICs of tigecycline and colistin promoting adaptive changes in bacterial physiology and virulence. Understanding these pathways in both environmental and clinical settings is essential to develop integrated strategies that mitigate resistance and improve therapeutic options against <em>A. baumannii</em>. This review emphasizes the need to address environmental reservoirs alongside clinical interventions to keep control on the resistance in a one health’s approach.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"979 ","pages":"Article 179521"},"PeriodicalIF":8.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Disposal of municipal solid waste incineration fly ash through synergistic in-plant dechlorination and sintering","authors":"Bingxin Fang ,&nbsp;Fuheng Xia ,&nbsp;Mengqi Zhao ,&nbsp;Yu Zheng ,&nbsp;Jingjie Li ,&nbsp;Wei Yu ,&nbsp;Renhui Ruan ,&nbsp;Yili Zhang ,&nbsp;Jidong Liang ,&nbsp;Xuebin Wang","doi":"10.1016/j.jenvman.2025.125514","DOIUrl":"10.1016/j.jenvman.2025.125514","url":null,"abstract":"<div><div>Incineration technology has emerged as the predominant approach for the safe disposal of municipal solid waste in China, generating a significant amount of fly ash as a byproduct. However, the primary landfill method currently employed in China, chelation stabilization coupling, falls short of reliability in terms of environmental standards. Consequently, the safe and effective disposal of fly ash containing high concentrations of chlorine salts, heavy metals, and dioxins is of critical importance. This study proposes a synergistic approach for the dechlorination and sintering of fly ash (FA) generated in waste incineration plants. This method entails the washing of FA with leachate and concentrate, followed by pelletizing and in-furnace sintering. The results indicated that treatment with leachate reduced the residual chlorine concentration in FA to 7 % at a liquid-to-solid ratio of 10 mL g⁻¹, while subsequent treatment with concentrate further lowered it to 4 %. FA also adsorbed impurities from the leachate and concentrate without substantially altering critical water quality parameters, enabling the treated liquids to be reintegrated into the leachate treatment system. Aspen Plus simulations demonstrated that in-furnace sintering had a negligible impact on furnace temperature, even when fly ash constituted 0–3 % of the total waste processed. Additionally, the plant's leachate and concentrate output lives up to FA washing requirements. Overall, our study provides fundamental information and establishes a novel model for a low-cost and eco-friendly “waste to treat waste” approach to dispose FA via leachate/concentrate washing in concert with in-furnace sintering.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"383 ","pages":"Article 125514"},"PeriodicalIF":8.0,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy savings and emission reduction benefits of China's aluminum use paths in transport sector","authors":"Xinpeng Zheng,&nbsp;Qiang Yue,&nbsp;Heming Wang","doi":"10.1016/j.scitotenv.2025.179524","DOIUrl":"10.1016/j.scitotenv.2025.179524","url":null,"abstract":"<div><div>Amid global climate change concerns, China, as the world's largest carbon emitter, confronts significant challenges in energy conservation and emission reduction aligned with its \"dual carbon\" objectives of achieving peak carbon emissions and carbon neutrality. Focusing on the transportation sector, this study employs the life cycle assessment (LCA) method and GREET software to analyze energy consumption and emissions across fuel vehicles (ICEVs), battery electric vehicles (BEVs), and plug-in hybrid vehicles (PHEVs) under varying lightweighting scenarios. The results show that the energy savings and emission reduction effect are best when the lightweighting ratio is 40 %, with a significant decrease in carbon emission and energy consumption, and the reduction in the vehicle's carbon emissions is approximately 5.93 % to 9.47 %, and the savings of the comprehensive energy consumption are 6.6 % to 7.75 %. The lightweighting scenario of 25 % shows the same trend of decreasing carbon emissions and energy consumption, but the effect is lower than the 40 % lightweighting scenario. However, in the lightweighting ratio scenarios of 55 % and 70 %, the advantage of the vehicle's use phase cannot offset the penalty of the aluminum production phase, and as the lightweighting ratio increases, energy consumption and carbon emissions also increase. A characterization of the environmental impacts over the entire life cycle of vehicles reveals that the global warming potential (GWP) is the highest. As the share of thermal power generation in the electricity mix decreases, it leads to a reduction in carbon emissions from aluminum production, and reduces the carbon penalty associated with a greater proportion of lightweight vehicles. This study provides a reference for China's aluminum application strategy in the transport sector.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"979 ","pages":"Article 179524"},"PeriodicalIF":8.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative analysis of dune toe extraction methodologies and implications for assessment of foredune dynamics","authors":"Alex Smith ,&nbsp;Jacob Lehner ,&nbsp;Charlotte Wills ,&nbsp;Grace Johnson ,&nbsp;Chris Houser","doi":"10.1016/j.scitotenv.2025.179277","DOIUrl":"10.1016/j.scitotenv.2025.179277","url":null,"abstract":"<div><div>An acceleration in Sea Level Rise (SLR) and change in storm activity is likely to increase erosion and flood hazards over the coming decades, representing a significant economic burden and threat to coastal environments globally. Foredune systems may mitigate hazards by providing a natural flood protection to back barrier resources, but only if they can maintain their volume and elevation in pace with SLR and changing storm climates. The beach–dune interface, or dune toe (dt), is an important process boundary that has been used to classify and assess the resiliency of coastal landscapes, however, concerns with inconsistent methodologies have been raised in several recent works. This study provides the first comparative analysis of dt extraction methodologies, discusses the potential impacts on coastal research, and presents the Minimum Averaged Relative Relief (MARR) machine learning model aimed at improving the consistency of dt classifications. Results indicate that interannual horizontal (±29 m) and vertical positions (±1.5 m) of dt predictions are significantly different and the consistency in classifications range widely between approaches and study sites. Overall, MARR was the most consistent displaying its potential to provide an improved methodology for comparisons between sites. Over a period of decades, a disparity in the rates of change in the horizontal (±1 m/y) and vertical (±14 mm/y) dt position were also significantly different among methodologies, which can lead to a divergence in vulnerability of predicted dt elevations (−1 to +1.5 m) relative to a 1–100-year extreme sea level event by 2100. These findings suggest that studies focused on the dt may not be directly comparable, and there is a further need to improve the repeatability and transferability of all coastal landscape classifications and metrics to better inform coastal management and address uncertainties of foredune response to changing sea levels and storm climates.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"979 ","pages":"Article 179277"},"PeriodicalIF":8.2,"publicationDate":"2025-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}