环境科学与生态学最新文献

{"title":"Microplastics in marine systems: A review of sources and sinks, typical environmental behaviors, and biological effects","authors":"Wenlu Li,&nbsp;Fanping Meng","doi":"10.1016/j.marpolbul.2025.117758","DOIUrl":"10.1016/j.marpolbul.2025.117758","url":null,"abstract":"<div><div>Marine microplastics (MPs), whether originating from household and industrial production or stemming from the degradation of larger plastic fragments, have currently attracted significant global attention among the scientific community. The transport and deposition of MPs, characterized by their small size and large quantity, under oceanic hydrodynamics result in the contamination of a wide range of areas. Furthermore, MPs are capable of carrying metals and organic pollutants that constitute composite pollutants. The additives it carries will gradually release harmful substances during the degradation process. Once ingested by aquatic organisms and amplified by the food chain, these pollutants can adversely affect the survival and growth of marine flora and fauna, ultimately posing potential threats to humans. In this review, the major sources and sinks of MPs are described, considering the pollution of marine ecosystems. Additionally, typical environmental behaviors of MPs including their migration and accumulation in the ocean, their combined ability with heavy metals and organic pollutants, their leaching of additives, and their abiotic and biotic degradation pathways are discussed. The adverse effects on marine organisms resulting from ingestion and translocation of MPs are also reviewed herein. Even though the number of studies on MPs-associated environmental impacts is increasing rapidly, this review underscores that there is a pressing necessity to achieve an integrated assessment of MPs' impacts on marine ecology in order to address existing and future knowledge gaps.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117758"},"PeriodicalIF":5.3,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528977","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":"Temperature and wind speed help fermentation-sourced microbiota reconstruct the airborne microbiota in the Chinese baijiu fermentation region","authors":"Yifu Zheng ,&nbsp;Yingli Jiang ,&nbsp;Jiao Niu ,&nbsp;Wanyu Deng ,&nbsp;Shibo Ban ,&nbsp;Yan Xu ,&nbsp;Qun Wu ,&nbsp;Yu Shi","doi":"10.1016/j.jenvman.2025.124769","DOIUrl":"10.1016/j.jenvman.2025.124769","url":null,"abstract":"<div><div>Microorganisms are vital components of airborne particles and are closely linked to human health and industrial processes. As industrialization advances, factories are exacerbating their impact on environmental microbial communities, an area where our understanding remains limited. In this study, we investigated air microorganisms surrounding Chinese baijiu fermentation facilities, aiming to explore the dispersal mechanisms of fermentation-sourced microbiota and their potential impacts on local airborne microbial communities. The results revealed a significant overlap between microbial communities from fermentation processes and the surrounding air, with 14 genera commonly found in both habitats, suggesting widespread and substantial dispersal of factory microorganisms. Due to this dispersal, fermentation-sourced <em>Saccharopolyspora</em> and <em>Streptomyces</em> have become central nodes in the airborne microbial network. Environmental factors played a pivotal role in the microbiota dispersal process. Higher temperatures may facilitate microbial proliferation and increase the dispersal of fermentation microorganisms (r = 0.30, <em>P</em> &lt; 0.01), while higher wind speeds may lead to a dilution effect and limit the uniform dispersal of microorganisms (r = −0.22, <em>P</em> &lt; 0.05). Furthermore, air-resident microorganisms restricted the proliferation of fermentation microorganisms (r = −0.60, <em>P</em> &lt; 0.001). These results confirm the modifying effect of fermentation facilities on environmental microbial communities and establish a theoretical foundation for optimizing factory site selection.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"378 ","pages":"Article 124769"},"PeriodicalIF":8.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528903","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":"Urinary biomarkers of drinking water disinfection byproducts in relation to blood-based liver function parameters among reproductive-aged Chinese women","authors":"Ping-Ping Gui ,&nbsp;Yan-Ling Deng ,&nbsp;Min Zhang ,&nbsp;Yu Miao ,&nbsp;Peng-Hui Liu ,&nbsp;Jia-Yue Zeng ,&nbsp;Yang Wu ,&nbsp;Cheng-Ru Li ,&nbsp;Xiao-Ying Liu ,&nbsp;Yang-Juan Li ,&nbsp;Jin-Qin Zhu ,&nbsp;A-Xue Liu ,&nbsp;Bin Zhou ,&nbsp;Fei Yang ,&nbsp;Qiang Zeng","doi":"10.1016/j.scitotenv.2025.179016","DOIUrl":"10.1016/j.scitotenv.2025.179016","url":null,"abstract":"<div><h3>Background</h3><div>Toxicological studies have documented that disinfection byproducts (DBPs), the ubiquitous drinking water pollutants, induce hepatotoxicity. Yet epidemiological evidence is sparse.</div></div><div><h3>Objective</h3><div>To assess urinary biomarkers of drinking water DBPs in relation to liver function parameters.</div></div><div><h3>Methods</h3><div>We included 1204 reproductive-aged women from the Tongji Reproductive and Environmental (TREE) study in Wuhan, China between December 2018 and July 2021. Urinary trichloroacetic acid (TCAA) and dichloroacetic acid (DCAA) as biomarkers of drinking water DBPs were assessed. Serum liver function parameters such as albumin (ALB), total cholesterol (TC), and alkaline phosphatase (ALP) were determined. Urinary DCAA and TCAA concentrations in relation to liver function parameters were examined by multivariate linear regression or restricted cubic spline (RCS) models.</div></div><div><h3>Results</h3><div>There was no evidence of urinary TCAA in relation to serum parameters of liver function. However, monotonic dose-response relationships were estimated between elevated tertiles of urinary DCAA concentrations and increased serum ALP (percent change = 4.25 %; 95 % CI: 0.34 %, 8.32 % for the upper vs. lower tertile) and TC levels (percent change = 3.84 %; 95 % CI: 0.63 %, 7.17 % for the upper vs. lower tertile). These associations remained for urinary DCAA modeled as the continuous exposure variable and were linear in the RCS models. Age, body mass index, and passive smoking status did not modify these associations.</div></div><div><h3>Conclusion</h3><div>DCAA but not TCAA exposure may contribute to damaged liver function in reproductive-aged women.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"970 ","pages":"Article 179016"},"PeriodicalIF":8.2,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529712","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":"Model-based management of macrophytes in shallow lakes under warming","authors":"Rainer Ferdinand Wunderlich ,&nbsp;Aurélien Jamoneau ,&nbsp;Sébastien Boutry ,&nbsp;Maha Hosni ,&nbsp;Vincent Bertrin","doi":"10.1016/j.jenvman.2025.124543","DOIUrl":"10.1016/j.jenvman.2025.124543","url":null,"abstract":"<div><div>Macrophytes are a critical component of freshwater ecosystems, harboring significant biodiversity and providing essential resources and services. However, their habitat faces multifaceted challenges from climate change, local anthropogenic disturbance, and biological invasions. Here, we aim to provide local management suggestions under both current and future higher temperature regimes. Using joint species distribution modeling (JSDM), we integrate comprehensive presence-absence data with environmental variables and ecological traits to predict the distributions and diversity of 44 vascular aquatic plant and charophyte species in three shallow lakes (435 sites in total) in southwestern France. The environmental variables considered included physical properties (including current surface temperature and a 2 °C warming scenario), anthropogenic disturbance, shoreline curvature, underwater topography, and the occurrence rate (temporary or permanent) of water and wetness. Subsequently, we use percentile-threshold-based spatial prioritization to identify conservation management hotspots. Our results show that macrophyte habitat suitability is largely influenced by land-use and human accessibility. Moreover, macrophyte habitat suitability and native species diversity generally decrease across lakes under warming. However, the decrease in habitat suitability is greater for native isoetid species than for invasive species—suggesting a potential forthcoming cascade of changing community composition, higher lacustrine trophic states, and impaired provisioning of ecosystem services. Therefore, we suggest immediately adopting adaptive management principles at the identified conservation management hotspots, including the control of and targeted monitoring for invasives as well as conservation and restoration measures for native species, in particular isoetids.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"378 ","pages":"Article 124543"},"PeriodicalIF":8.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transformation of organic matter under anoxic conditions in soils","authors":"S.M. Pyzola,&nbsp;P. Dhakal,&nbsp;M.S. Coyne,&nbsp;J.H. Grove,&nbsp;M.M. Vandiviere,&nbsp;C.J. Matocha","doi":"10.1016/j.scitotenv.2025.178899","DOIUrl":"10.1016/j.scitotenv.2025.178899","url":null,"abstract":"<div><div>The transformation of organic matter under anoxic conditions is mediated by hydrolysis and fermentation processes resulting in products such as acetate and hydrogen which are then utilized by microorganisms in respiration. Respiring microorganisms employ an array of electron acceptors in soils, including nitrate, manganese(IV), iron(III), and sulfate, which are consumed depending on availability and decreasing Gibbs free energy yield. The classical view is that respiration is more rapid than fermentation and these two processes do not co-occur, however, evidence has mounted to challenge this view. In addition, it is unclear how the production of ammonium during ammonification of soil organic nitrogen is intertwined with fermentation and respiration. Accordingly, stirred-batch microcosms were incubated to quantify relevant chemical species over time (acetate, nitrate, iron(II), manganese(II), and ammonium) using native terminal electron acceptors (TEAs) and soil organic matter in four soils varying in drainage status under anoxic conditions. The net rate of acetate production in one of the moderately well-drained (Sadler) soils was 1.1 ± 0.07 μmol g⁻¹ d⁻¹, which was similar to Mn(II) accumulation rates (0.95 ± 0.3 μmol g⁻¹ d⁻¹, <em>P</em> = 0.57). A similar trend was observed in the well-drained (Feliciana) soil, indicating that Mn(IV) respiration and fermentation can co-occur in certain soils. In the other moderately well drained and the poorly drained soil, acetate production was suppressed due in part to elevated native nitrate levels, which raised the redox potential and acted as a competitive electron acceptor. Across all four soils, ammonification rates were positively correlated with acetate formation rates (<em>r</em> = 0.88, <em>P</em> &lt; 0.001), suggesting the possibility of amino acid fermentation during these anoxic incubations. These results challenge the current paradigm that the fermentation step in anoxic organic matter decomposition is slow and Mn(IV) respiration is rapid, with implications for organic matter transformations and nutrient cycling.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"970 ","pages":"Article 178899"},"PeriodicalIF":8.2,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529478","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":"Investigation on the reactive transport characteristic of uranium-bearing sandstone during the in-situ leaching mining uranium","authors":"Xuebin Su ,&nbsp;Junlin Mao ,&nbsp;Tong Zhang ,&nbsp;Xin Yang ,&nbsp;Yihan Yang ,&nbsp;Chuanfei Zhang ,&nbsp;Peng Qiao ,&nbsp;Bingzhang Li ,&nbsp;Fan Chen","doi":"10.1016/j.jenvrad.2025.107654","DOIUrl":"10.1016/j.jenvrad.2025.107654","url":null,"abstract":"<div><div>The multi-phase flow in dynamic pore-fracture is crucial to the safety and efficient uranium mining using the in-situ leaching method. In this study, the pore-fracture evolution and multi-phase flow morphology was investigated using the online low-field nuclear magnetic resonance (NMR) system, and the relationship of pore structure, permeability transformation and chemical reaction was analyzed. The results show that the adsorption pore (0.1 ms &lt; AP &lt; 10 ms,46.4%), seepage pore (10 ms &lt; SP &lt; 100 ms,36.6%) and migration pore (100 ms &lt; MP,17.0%) composed the pore-fracture structure, and the chemical corrosion increased the AP, the decreased SP was mainly controlled by the carbonatite precipitation, and MP was enhanced by the dynamic fluid pressure and decreased by the carbonatite precipitation. Compared with the increased permeability of uranium dissolution-dependent pore structure, the carbonatite precipitation-dependent pore structure dominated the decreased permeability during the in-situ leaching. The increased effect on permeability and mineral dissolution for dynamic pressure was gradually weakened by the carbonatite precipitation. Thus, the uranium dissolution was mainly occurred at AP, the uranium-bearing solution migration was controlled by SP, and carbonatite precipitation was occurred at MP. The transformation between the AP, SP and MP was integral dominated by the corrosion dissolution, carbonatite precipitation and fluid kinetics, resulting in the decrease of SP and permeability. The variation in uranium concentration from 0.1 MPa to 0.7 MPa indicates that uranium dissolution and migration in the in-situ leaching process are primarily governed by the interplay of pressure, fluid dynamics, and carbonate precipitation. At lower pressures, enhanced uranium dissolution facilitates greater mobility. However, as pressure increases, carbonate precipitation intensifies, significantly hindering uranium migration and resulting in a marked decrease in uranium concentration. Thus, the conductivity of the uranium-bearing sandstone characterized by the permeability was directly dominated by the SP. The finding provides significant insight into safety and efficiency in-situ leaching uranium mining.</div></div>","PeriodicalId":15667,"journal":{"name":"Journal of environmental radioactivity","volume":"284 ","pages":"Article 107654"},"PeriodicalIF":1.9,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529351","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":"Complex and Dynamic Effects of an Extreme Low Temperature Weather Event on Invasive Plant Populations and Resident Communities","authors":"Maurício Cruz Mantoani,&nbsp;Conor Sweeney,&nbsp;Bruce A. Osborne","doi":"10.1111/gcb.70113","DOIUrl":"https://doi.org/10.1111/gcb.70113","url":null,"abstract":"<p>Whilst it is often assumed that invasive plant species may benefit more from climate change than native species, there is little empirical data on how they, and the communities they invade, respond to extreme weather events (EWEs). Here, we show that the effects of a low temperature EWE can result in a dramatic reduction in both vegetative and reproductive growth of invasive populations of <i>Gunnera tinctoria</i>, although a significant recovery was found within 1 year after its occurrence. Whilst the EWE decreased both the leaf/petiole numbers of mature plants, the major impact was on leaf expansion and a decrease in the size/number of inflorescences. Concomitant with the reduction in growth of <i>G. tinctoria</i>, there was a 5-fold increase in the number of resident species emerging in invaded areas, which largely persisted after the recovery of the invasive populations. Although the growth of <i>G. tinctoria</i> seedlings was also reduced, this was relatively small, and growth and development resumed almost immediately after the EWE. In comparison, the resident plant community was largely unaffected by the EWE either due to the later initiation of growth and/or because of their greater resilience to episodic low temperature events. Our results show that an EWE of this magnitude can have complex time-dependent effects on plant invasions and invaded communities, with a greater impact on the established invasive plants compared to newly recruited seedlings. Based on an assessment of historical climatic data, these long-lived populations have been exposed to EWEs of a similar or greater magnitude in the past, which have not constrained their spread or compromised recruitment. Given the likelihood of an almost complete absence of low temperature EWEs of similar magnitude in the future, any temporary restrictions on the growth of invasive <i>G. tinctoria</i> and other similar invasive species populations are likely to be small.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"31 3","pages":""},"PeriodicalIF":10.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/gcb.70113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative assessment of past variations in Sphagnum bog community structure using paleo-species distribution modeling","authors":"Eleonor E. S. Ryberg,&nbsp;Alicia Valdés,&nbsp;Johan Ehrlén,&nbsp;Minna Väliranta,&nbsp;Malin E. Kylander","doi":"10.1002/ecy.70033","DOIUrl":"https://doi.org/10.1002/ecy.70033","url":null,"abstract":"<p>A common approach to investigating species' niches is to examine relationships between spatial variation in environmental conditions and contemporary species occurrences, using species distribution models (SDM or niche models). The relationships between past species distributions and environmental variation over time are less commonly explored. One way to examine effects on species changes over time is to use paleo-datasets to parameterize niche models, where the use of temporal variation allows for making more direct links between past species and environmental conditions through records of past changes. We examined the impact of five environmental variables (temperature, incidence of external nutrient input, local [within bog] moisture, incidence of regionally dry periods, and fire activity) on temporal variation in peatland species composition, occurrences, and abundances (<i>Sphagnum</i>, <i>Eriophorum</i>, <i>Carex</i>, and Ericaceous dwarf shrubs) using a high-resolution peat macrofossil paleo-record spanning the last ~10,000 years from the Store Mosse bog (south-central Sweden). Our results showed that species composition was affected by external nutrient input, local moisture conditions and incidence of regionally dry conditions. The presence and abundance of different species groups were mainly affected by external nutrient input and the incidence of regionally dry periods. Moreover, hummock <i>Sphagna</i> benefited from external nutrient input and low moisture, and in one species, warmer temperatures. Intermediate <i>Sphagna</i> from cooler temperatures with no external nutrient input, and hollow <i>Sphagna</i> from cooler temperatures and external nutrient input. Lastly, our results showed that environmental effects differed between the successional stages of the peatland in one case. Overall, the observed species' responses imply that peatland carbon dynamics will shift with future changes in climate. By examining links between climate and species responses of the past, this study demonstrates that the paleo-data approach in SDMs can contribute to a better understanding of the environmental effects influencing species distributions on longer time scales, thereby providing a valuable tool to improve predictions of future climate change effects.</p>","PeriodicalId":11484,"journal":{"name":"Ecology","volume":"106 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ecy.70033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating Genetic Diversity in Hatchery-Produced Dentex dentex and Sciaena umbra for Restocking in Corsican Waters","authors":"Salomé Ducos,&nbsp;Patrick Berrebi,&nbsp;Bruno Guinand,&nbsp;Mikaël Demolliens,&nbsp;Antoine Aiello,&nbsp;Eric D. H. Durieux","doi":"10.1002/aqc.70056","DOIUrl":"https://doi.org/10.1002/aqc.70056","url":null,"abstract":"<p><i>Dentex dentex</i> and <i>Sciaena umbra</i> are two coastal fish species inhabiting Mediterranean waters, where they are considered threatened (assessed as ‘Vulnerable’ on the IUCN Red List). With increased knowledge of both species reproduction, they are envisioned as potential candidate species for restocking purposes around Corsica. However, such actions require genetic monitoring of juveniles that aimed to be released in order to make sure that restocking could not alter the natural genetic diversity. This study aimed to investigate microsatellite gene diversity of hatchery-reared <i>D. dentex</i> and <i>S. umbra</i> juveniles (8 and 11 microsatellite markers, respectively), compared to wild Corsican populations. In each species, broodstock genetic diversity turned out to be quite representative of wild populations. However, this study highlighted that the effective number of breeders was very small in <i>S. umbra</i> (29% of the broodstock participated in juveniles' production) and was composed of dominant parents (i.e., higher contribution of these parents to juvenile production) in <i>D. dentex</i> (one male and one female produced the majority of the juvenile sample). This led to heterozygote excess in juvenile samples and a significant genetic differentiation between (i) juvenile and wild samples and (ii) juvenile and broodstock samples, in both species. Broodstock individuals used in this study were fished in the wild, which was proven here not be sufficient for maintaining the level of genetic diversity found in natural populations. This study highlighted the idea that husbandry production might induce genetic distortion and therefore that genetic controls on hatchery-produced juveniles are essential for restocking purposes.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bridge Collapse in Mutsu, Aomori Prefecture, Japan in 2021","authors":"Hiroshi Takebayashi,&nbsp;Masaharu Fujita","doi":"10.1111/jfr3.70025","DOIUrl":"https://doi.org/10.1111/jfr3.70025","url":null,"abstract":"<p>On August 9–10, 2021, the Koakagawa Bridge in Mutsu, Aomori Prefecture, Japan, collapsed owing to the flood caused by a tropical cyclone. In this study, the cause of the collapse was examined. The characteristics of flood inundation with bypassing flows and countermeasures for bank erosion due to channel blockage by driftwood were investigated based on field surveys and numerical simulations. The scouring of the bed around the bridge pier was found to be the cause leading to bridge failure. Channel blockage owing to driftwood would have caused flood inundation and damage to the left bank, the top of the bank is bare of sediment, by forming a bypassing flow. However, the surface of the right bank on which the bypassing flow with high velocity formed was covered with concrete; therefore, bank erosion did not occur. These results indicate that to prevent bank erosion caused by bypassing flows during floods, it is important to protect banks downstream of the bridge using non-erosive materials. Only a small area, where bypassing flows form and non-dimensional shear stress is larger than 0.05, is sufficient for protection. It is also important to predict bed degradation characteristics around piers and banks, especially when the bed material is small.</p>","PeriodicalId":49294,"journal":{"name":"Journal of Flood Risk Management","volume":"18 1","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jfr3.70025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}