Journal of Great Lakes Research最新文献_第9页

Bacterial community structure across a sand dune chronosequence at the Indiana Dunes National Park 细菌群落结构跨越沙丘时间序列在印第安纳沙丘国家公园

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-10-01 Epub Date: 2025-07-05 DOI: 10.1016/j.jglr.2025.102611

Muruleedhara N. Byappanahalli , Noel B. Pavlovic , Cindy H. Nakatsu

The microbial role in dune succession along the Great Lakes freshwater sand dunes remains poorly understood. A chronosequence study was conducted to understand the relationships among soil bacterial communities, soil chemistry, and prescribed burning at the Indiana Dunes National Park. Soil bacterial communities and chemistry, as well as groundlayer vegetation were sampled during 2015 and 2017 from seven successional stages from the beach (contemporary) to the 14,000-year-old oak forest. Bacterial communities from unburned and burned sites among stages were determined by 16S rRNA gene amplicon sequencing. Soil pH and cations decreased from early (beach, foredune, secondary dune, and woodland transition) to late (oak savanna, woodland, and oak forest) successional stages, while organic matter and organic carbon concentrations increased in the late successional stages. Bacterial alpha diversity showed no significant differences among stages, but a significant interaction was found between stage and prescribed burning (H = 39.7, p < 0.001). Bacterial communities separated mainly along stage by all four beta diversity metrics used (Bray Curtis, Jaccard, and Weighted and Unweighted UniFrac), with the main difference observed along the primary axis (weighted UniFrac, 48 %). Bacterial phyla were differentially abundant in older soil stages compared to beach (ANCOM-BC, q < 0.05); likewise, differential abundances in genera were evident when burned and unburned sites were compared. A Mantel test indicated stronger congruency between the bacterial communities and soil chemistry than between bacterial communities and vegetation. Collectively, soil chemical and microbial parameters along with management practices contribute to dunal successional patterns in the Great Lakes.

微生物在五大湖淡水沙丘沙丘演替中的作用仍然知之甚少。在印第安纳沙丘国家公园进行了一项时间顺序研究，以了解土壤细菌群落、土壤化学和规定燃烧之间的关系。在2015年和2017年期间，从海滩（当代）到14000年历史的橡树林的七个连续阶段，对土壤细菌群落和化学成分以及底层植被进行了采样。通过16S rRNA基因扩增子测序，确定各阶段未烧伤和烧伤部位的细菌群落。土壤pH和阳离子从演替早期（滩地、前丘、次生沙丘和林地过渡）到演替后期（栎树草原、林地和栎林）呈下降趋势，有机质和有机碳浓度在演替后期呈上升趋势。细菌α多样性在不同阶段间无显著差异，但在不同阶段和规定燃烧之间存在显著的相互作用（H = 39.7, p < 0.001）。通过使用的所有四种beta多样性指标（Bray Curtis, Jaccard，加权和未加权UniFrac），细菌群落主要沿着阶段分离，主要沿着主轴（加权UniFrac， 48%）观察到差异。与滩地相比，较老土壤阶段细菌种类丰富（ANCOM-BC, q < 0.05）；同样，当比较燃烧和未燃烧的地点时，一般的差异丰度是明显的。Mantel试验表明，细菌群落与土壤化学的一致性强于细菌群落与植被的一致性。总的来说，土壤化学和微生物参数以及管理措施有助于五大湖的昼夜演替模式。

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引用次数: 0

Grass carp (Ctenopharyngodon idella) movement states and backwater use can inform removal efforts 草鱼（Ctenopharyngodon idella）的运动状态和回水利用可以为清除工作提供信息

IF 2.5 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-10-01 Epub Date: 2025-08-06 DOI: 10.1016/j.jglr.2025.102654

Sophia M. Bonjour , Robert D. Hunter , James J. Roberts , Travis O. Brenden , Scott F. Colborne , Matthew D. Faust , Christine M. Mayer , Robert Mapes , Richard T. Kraus , Robin D. Calfee , Matthew R. Acre

Expansion of grass carp (Ctenopharyngodon idella) within the Laurentian Great Lakes poses significant ecological and economic risks. Suppression efforts to remove grass carp have increased to curtail population growth, but capture efficiency remains low. One management challenge is the lack of understanding how this invasive species is using its novel habitats in the Great Lakes. This study aimed to identify spatiotemporal patterns in grass carp behavior and backwater use that could be exploited by management efforts, including removal. We used acoustic telemetry to examine when grass carp occurred in areas vulnerable to removal by boat electrofishing in the Sandusky River, Ohio, USA. Hidden Markov models were used to categorize behavioral states and evaluate their relationships with environmental factors. Best performing 2-state and 3-state hidden Markov models included proximity to backwater as a factor in state-dependent step length and transition probability between states, with a higher probability of being in less mobile states during the middle of the day and in backwaters. For the 2-state model, this less mobile state was also more common during warmer temperatures. Distinct diel patterns and backwater use identified in this study provide critical insights for improving management. Model results suggest that current removal efforts, focused primarily on the mainstem of the river, may benefit from adjustments in both timing and removal gear. The findings raise further questions about unobserved behaviors contributing to state assignment and sufficiently flexible adaptive management strategies to account for individual variation in grass carp behavior.

草鱼（Ctenopharyngodon idella）在劳伦森五大湖的扩张带来了重大的生态和经济风险。为了抑制草鱼的数量增长，已经加大了对草鱼的抑制力度，但捕获效率仍然很低。管理上的一个挑战是缺乏对这种入侵物种如何利用其在五大湖的新栖息地的了解。本研究旨在确定草鱼行为和回水利用的时空模式，这些模式可以通过管理努力（包括清除）加以利用。在美国俄亥俄州的桑达斯基河，我们使用声波遥测技术来检测草鱼何时出现在易被船电捕鱼清除的区域。使用隐马尔可夫模型对行为状态进行分类，并评估其与环境因素的关系。表现最好的2状态和3状态隐马尔可夫模型包括接近回水作为状态依赖的步长和状态之间的过渡概率的一个因素，在中午和在回水中处于流动性较差状态的概率较高。对于双状态模型，这种流动性较差的状态在较暖的温度下也更为常见。本研究确定的独特的水模式和回水利用为改善管理提供了重要的见解。模型结果表明，目前的清除工作主要集中在河流的主干上，可能会从调整时间和清除装置中受益。这些发现提出了进一步的问题，即未观察到的行为有助于状态分配和足够灵活的适应性管理策略，以解释草鱼行为的个体差异。

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引用次数: 0

Resourcing Michigan’s coastal decision-makers: Assessing needs & opportunities 为密歇根沿海决策者提供资源：评估需求和机会

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-01-15 DOI: 10.1016/j.jglr.2025.102512

Mike Shriberg , Richard K. Norton , Silvia Newell , Kat Cameron , Abigail Merolle

Despite increased interest in and funding for coastal resilience, Great Lakes coastal managers have not been able to keep pace with community needs, an ongoing challenge heightened by higher variability in shoreline dynamics due to climate change. To identify resource needs and gaps and to support approaches to coastal resilience in Michigan, we conducted interviews and convened a workshop and briefing with over 50 coastal managers and experts. The results revealed that there is a strong need and desire for greater clarity about how to prioritize many and, at times, competing demands, for identifying methods for equitable shoreline protection, for guidance on garnering and utilizing funding, for assistance communicating and engaging with the community, and for clarifying the role regulations and community plans can and should play. Key barriers to addressing these needs and gaps include a lack of capacity among coastal managers, inadequate understanding of problems and solutions, and a lack of political incentives for proactive decision-making. These gaps often lead to short-term, highly localized decisions that often have adverse impacts. To address these deficiencies, workshop participants and the authors developed a community-based framework comprising five pillars: planning assistance, legal/policy assistance, ecologically informed technical assistance, communication and community engagement, and funding assistance. To help implement these pillars, participants suggested forming three overlapping communities of practice as well as the creation of a coastal resilience resource hub (which has since been created for Michigan with plans to expand regionwide) as a repository of resources to support coastal managers in decision-making.

尽管人们对沿海恢复力的兴趣和资金不断增加，但五大湖沿海管理者仍无法跟上社区需求的步伐，气候变化导致的海岸线动态变化加剧了这一持续挑战。为了确定资源需求和差距，并支持密歇根州沿海恢复力的方法，我们进行了采访，并与50多名沿海管理人员和专家召开了研讨会和简报会。结果表明，对于如何优先考虑许多，有时是相互竞争的需求，确定公平的海岸线保护方法，获得和利用资金的指导，协助与社区沟通和参与，以及澄清法规和社区计划可以和应该发挥的作用，有强烈的需求和愿望。解决这些需求和差距的主要障碍包括沿海管理人员缺乏能力，对问题和解决办法的理解不足，以及缺乏积极决策的政治激励。这些差距往往导致短期的、高度本地化的决策，往往产生不利影响。为了解决这些不足，研讨会参与者和作者开发了一个基于社区的框架，包括五个支柱：规划援助、法律/政策援助、生态知情技术援助、沟通和社区参与以及资金援助。为了帮助实施这些支柱，与会者建议形成三个重叠的实践社区，并创建一个沿海弹性资源中心（已为密歇根州创建，并计划扩展到整个地区），作为支持沿海管理者决策的资源库。

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引用次数: 0

Addressing Great Lakes coastal hazards through regional communities of practice 通过区域实践社区解决大湖区沿海灾害

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2024-10-14 DOI: 10.1016/j.jglr.2024.102439

Lydia M. Salus , Sarah A. Brown , Adam J. Bechle

Four regional Communities of Practice (CoPs) were developed across the coasts of Wisconsin and Minnesota to help communities connect with each other as they address their common challenges with coastal hazards like erosion, storms, and flooding. Great Lakes coastal hazards are significantly influenced by the water levels of the lakes, which can vary by up to ∼ 2 m (∼6.5 feet) between record highs and lows. These decadal fluctuations of water levels can lead to hazard impacts being forgotten in between the extremes, resulting in a diminished capacity to address coastal hazards when extreme conditions return. These hazards are expected to persist and potentially become more severe due to changing climate conditions. To build capacity to address coastal hazards, public officials and staff have consistently expressed a need for structure and leadership to guide knowledge sharing and collaborative action between coastal communities. The four regional CoPs coordinated learning and sharing among communities to collectively build coastal resilience and bring more resources to the region. These CoPs have provided members with learning opportunities, relationship building activities, technical assistance, and regular communications about hazards and resources. Members report that their participation in the CoPs resulted in outcomes that reduce coastal hazard risk, including improved planning, enhanced mapping capabilities, and identification of priority coastal management practices. The technical and social capacity created through the CoPs has helped members work across boundaries to navigate complex coastal hazard issues. Through regular evaluation, the CoPs have continued to evolve to meet changing needs of their member coastal communities.

在威斯康辛州和明尼苏达州沿海地区开发了四个区域实践社区（cop），以帮助社区在应对侵蚀、风暴和洪水等沿海灾害的共同挑战时相互联系。五大湖沿海灾害受到湖泊水位的显著影响，湖泊水位在历史最高和最低水位之间的变化可达2米（6.5英尺）。这些年代际的水位波动可能导致灾害影响在两次极端事件之间被遗忘，从而导致在极端条件再次出现时应对沿海灾害的能力下降。由于气候条件的变化，这些危害预计将持续存在，并可能变得更加严重。为了建设应对沿海灾害的能力，政府官员和工作人员一直表示，需要建立结构和领导力，以指导沿海社区之间的知识共享和合作行动。四个区域缔约方会议协调社区之间的学习和分享，共同建立沿海复原力，并为该地区带来更多资源。缔约方会议为成员提供了学习机会、建立关系的活动、技术援助以及关于危险和资源的定期沟通。各成员报告说，它们参与缔约方会议取得了减少沿海灾害风险的成果，包括改进规划、增强制图能力和确定沿海管理的优先做法。缔约方会议创造的技术和社会能力帮助成员国跨越边界，解决复杂的沿海灾害问题。通过定期评估，缔约方会议不断发展，以满足其沿海成员社区不断变化的需求。

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引用次数: 0

Thermodynamic exposure reductions of PCBs available to Lumbriculus variegatus in Lake Erie region sediments amended with activated carbon 伊利湖地区沉积物中多氯联苯的热力学暴露减少

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-04-25 DOI: 10.1016/j.jglr.2025.102582

Philip T. Gidley, Guilherme R. Lotufo, Paul R. Schroeder

A chemical activity-based assessment of polychlorinated biphenyl (PCB) bioaccumulation from Lake Erie region sediments was studied using polydimethylsiloxane (PDMS) coated fibers and Dow Corning (DC) silicone coated jars, both with ex situ mixing (i.e., agitation). Polymers equilibrated with the sediments were compared to bioaccumulation in blackworms (Lumbriculus variegatus), exposed to the sediments for 28 days. Sediments were from Cleveland Harbor, Ashtabula Harbor (Ohio, USA), and Buffalo River (New York, USA). The sediment from Ashtabula was amended with activated carbon (AC). Using lipid-polymer partition coefficients, the polymers were able to estimate actual bioaccumulation in worms, with close to a 1:1 relationship and r² = 0.94. If lipid normalized worm bioaccumulation was compared to equilibrated PDMS concentrations, there was a 20:1 ‘off-set’ (lipid concentration ≈ 20 × PDMS concentration), but the relation was still strong (r² = 0.87). Different doses of AC were mixed into Ashtabula sediment in the laboratory, corresponding to 1 %, 10 %, and 100 % of the native total organic carbon (TOC). Based on PCB concentrations in DC silicone, a target AC dose equal to 10 % of the TOC would substantially reduce (∼62 %) bioaccumulation of the more hydrophobic PCBs (log octanol–water partition coefficient > 6) from Ashtabula Harbor dredged material. Widespread AC amendment to surficial sediment of the eastern basin of Lake Erie may reduce the thermodynamic pressure of PCBs from that sediment source and allow for a continued decline in fish tissue concentrations.

采用聚二甲基硅氧烷（PDMS）涂层纤维和道康宁（DC）有机硅涂层罐，对伊利湖地区沉积物中多氯联苯（PCB）的生物积累进行了基于化学活性的评估。与沉积物平衡的聚合物与暴露于沉积物28天的黑虫（Lumbriculus variegatus）的生物积累进行了比较。沉积物来自克利夫兰港、阿什塔布拉港（美国俄亥俄州）和布法罗河（美国纽约州）。用活性炭（AC）对Ashtabula沉积物进行了改性。利用脂质-聚合物分配系数，聚合物能够估计蠕虫体内的实际生物积累，两者之间的关系接近1:1，r2 = 0.94。如果将脂质正常化的蠕虫生物积累与平衡的PDMS浓度进行比较，存在20:1的“偏移”（脂质浓度≈20 × PDMS浓度），但相关性仍然很强（r2 = 0.87）。在实验室中，将不同剂量的AC混合到Ashtabula沉积物中，分别相当于天然总有机碳（TOC）的1%、10%和100%。基于直流有机硅中的PCB浓度，目标交流剂量等于TOC的10%将大大减少（~ 62%）疏水性更强的PCB的生物积累(对数辛醇-水分配系数>；6)从Ashtabula港疏浚物料。伊利湖东部盆地表层沉积物的广泛AC修正可能会降低来自该沉积物源的多氯联苯的热力学压力，并允许鱼类组织浓度持续下降。

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引用次数: 0

Turbidity associated with the beneficial placement of dredged sediment in the dynamic littoral zone at Fairport Harbor, Ohio 浊度与疏浚泥沙在俄亥俄州费尔波特港动态沿岸带的有利位置有关

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-02-07 DOI: 10.1016/j.jglr.2025.102533

Douglas R. Krafft , Jonathan M. Waddell , Karen G. Keil , Brett A. Hayhurst , Brian C. McFall , James P. Selegean

The nearshore placement of sediments dredged via maintenance of navigation channels is a cost-effective management solution which offers myriad benefits that can include shoreline protection and habitat restoration. Benefits can be offset by concerns due to potential effects on the ecosystem from turbidity generated during placement. This study investigates the turbidity and geomorphic response of dredged sediment placed within the dynamic littoral zone of Lake Erie. Turbidity was measured at nine locations before, during, and after nearshore dredged material placement, and bathymetry was measured in four surveys to capture the effects of placing 39,400 m³ of material from Fairport Harbor, Ohio. Nearshore turbidity measurements collected before dredging occurred could be explained using wave data, which provided an estimate for expected background turbidity during and after dredging. These wave models continued to fit measured turbidity data well during and after dredged material placement and indicate sediment placement did not significantly increase turbidity at any of the monitoring locations. Bathymetry surveys indicate sediment was placed within the active littoral zone and may have contributed to accretion along the onshore edge of the pre-existing bar. These observations indicate that nearshore placement of dredged material in this environment is aligned with natural sediment movement in the littoral zone, with minimal to negligible generation of turbidity beyond what occurs naturally.

通过维护航道疏浚沉积物的近岸安置是一种经济有效的管理解决方案，可以提供无数的好处，包括海岸线保护和栖息地恢复。由于在放置过程中产生的浑浊对生态系统的潜在影响，可能会抵消这些好处。本文研究了伊利湖动态沿岸带内疏浚泥沙的浊度和地貌响应。在近岸疏浚材料放置之前、期间和之后的九个地点测量了浊度，并在四次调查中测量了水深测量，以捕捉从俄亥俄州费尔波特港放置39,400立方米材料的影响。在疏浚发生之前收集的近岸浑浊度测量可以用波浪数据来解释，波浪数据提供了疏浚期间和之后预期背景浑浊度的估计。在疏浚材料放置期间和之后，这些波浪模型继续很好地拟合测量的浊度数据，并表明沉积物放置在任何监测地点都没有显着增加浊度。水深测量表明，沉积物被放置在活跃的沿海带内，可能导致了先前存在的沙洲沿海岸边缘的增生。这些观察结果表明，在这种环境中，近岸疏浚材料的放置与沿海地区的自然沉积物运动一致，除了自然发生的浑浊之外，产生的浑浊程度很小，甚至可以忽略不计。

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引用次数: 0

Foredune-ridge development along an urban pocket beach, Montrose Dunes Natural Area, southwestern Lake Michigan 沿着城市口袋海滩，蒙特罗斯沙丘自然区，西南密歇根湖的前山岭发展

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2024-10-02 DOI: 10.1016/j.jglr.2024.102449

C.R. Mattheus

While foredune geomorphology has been studied along many Great Lakes coastlines, little attention has been given to the development and evolution of foredune ridges along engineered ‘pocket’ beaches, which are common along many urban lakefronts of the region. This paper reports on the recent morphodynamics of Montrose Beach, the largest of Chicago’s engineered coastal embayments, with emphasis on its ‘Dunes Natural Area.’ A post-2020 period of beach recovery occurred after 2013–2020 lake-level rise of >1.5 m, which was accompanied by shoreline recession and overwash-induced backshore accretion. The influx of sand into the urban embayment during this time facilitated post-2020 beach recovery with lake-level fall. This phase of beach expansion was marked by the formation of three distinct, parallel berm lines that have become vegetated and functioned as focal points for eolian accretion. Undisturbed by grooming and other beach-management activities, the Dunes Natural Area continues to be influenced by lake-level changes and storms. Vegetative establishment and eolian sand trapping, upon disconnect from active reworking along the shoreline, have increased the expression of linear topographic highs. Seasonal ridgelines along natural beach environments, including barrier spits, tend to undergo reworking prior to such stabilization. Insights from Montrose Beach provide coastal managers with up-to-date information on important geomorphic developments at Chicago’s most popular beach destination, whose Dunes Natural Area provides habitat for the endangered Great Lakes piping plover. Understanding its geomorphic trajectory can help inform coastal resiliency planning, here and elsewhere, to protect valuable ecosystems and infrastructure within the urban coastal landscape.

虽然前沙丘地貌已经沿着许多五大湖海岸线进行了研究，但很少有人关注沿工程“口袋”海滩的前沙丘山脊的发展和演变，这些海滩在该地区的许多城市湖滨地区都很常见。本文报道了蒙特罗斯海滩的最新形态动力学，这是芝加哥最大的工程海岸码头，重点是它的“沙丘自然区”。“在2013-2020年湖面上升1.5米之后，出现了2020年后的海滩恢复期，伴随着海岸线衰退和冲过引起的后海岸增生。”在此期间，沙子涌入城市海湾，促进了2020年后海滩的恢复，湖泊水位下降。这一阶段的海滩扩张的特点是形成了三条不同的、平行的护堤线，这些护堤线已经被植被覆盖，并成为风积的焦点。沙丘自然区没有受到梳理和其他海滩管理活动的干扰，继续受到湖泊水位变化和风暴的影响。植被的建立和风成沙的圈闭，在与海岸线的主动改造断开后，增加了线性地形高度的表达。沿着自然海滩环境的季节性山脊线，包括屏障喷口，往往会在这种稳定之前进行改造。来自蒙特罗斯海滩的见解为海岸管理者提供了芝加哥最受欢迎的海滩目的地重要地貌发展的最新信息，其沙丘自然区为濒临灭绝的五大湖管鸻提供了栖息地。了解其地貌轨迹有助于为这里和其他地方的沿海弹性规划提供信息，以保护城市沿海景观中有价值的生态系统和基础设施。

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引用次数: 0

Frequency and duration of weak thermal stratification and hypoxia in the shallow western basin of Lake Erie 伊利湖西部浅层盆地弱热分层和缺氧的频率和持续时间

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-05-06 DOI: 10.1016/j.jglr.2025.102596

Yulong Kuai, Mathew G. Wells

Polymictic lakes are not always continuously mixed; they often experience alternating periods of mixing and weak stratification. The shallow western basin of Lake Erie is one example of a polymictic basin where the frequency of mixing has important consequences for water quality. In this study, we capture high-frequency data from the summers of 2021, 2022, and 2023, including water temperature, dissolved oxygen (DO), and water current velocity. This dataset allows us to show that hypoxic events (<2 mg/L) are triggered by episodes of weak stratification in Pigeon Bay, in western Lake Erie. Our five sampling sites in Pigeon Bay were located 50 m to 20 km from an important nearshore municipal water intake that supplies drinkable water to ∼66,800 residents and to the second largest greenhouse cluster in the world. Between June and September in these 3 years, we found that Pigeon Bay was stratified with a vertical temperature difference above 2 °C, for respectively 45 % (2021), 54 % (2022), and 25 % (2023) of the time. Significantly, all the hypoxic events were associated with stratified events. During the sampling periods, stratified events and hypoxic events were induced by either 1) local surface heating or 2) advection of hypolimnetic water from central Lake Erie. The majority of the hypoxic events in Pigeon Bay (83 % in 2021, 86 % in 2022, and 67 % in 2023) were associated with the horizontal transport of cold water that originated over 20 km from the central basin of Lake Erie.

多相湖泊并不总是连续混合；它们经常经历混合和弱分层交替的时期。伊利湖西部浅水盆地是多融盆地的一个例子，混合的频率对水质有重要影响。在本研究中，我们捕获了2021年、2022年和2023年夏季的高频数据，包括水温、溶解氧（DO）和水流速度。这个数据集可以让我们证明缺氧事件（2mg /L）是由伊利湖西部鸽子湾的弱分层引发的。我们在鸽湾的五个采样点距离一个重要的近岸市政取水口50米至20公里，该取水口为约66,800名居民和世界第二大温室群提供饮用水。在这3年的6 - 9月间，我们发现鸽湾垂直温差大于2°C的分层时间分别为45%（2021年）、54%（2022年）和25%（2023年）。值得注意的是，所有缺氧事件都与分层事件相关。在采样期间，分层事件和缺氧事件是由1)局部地表加热或2)伊利湖中部低通量水平流引起的。鸽子湾的大多数缺氧事件（2021年为83%，2022年为86%，2023年为67%）与来自伊利湖中央盆地20公里以上的冷水水平输送有关。

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引用次数: 0

Mapping Michigan’s historical coastlines 绘制密歇根历史上的海岸线

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-02-14 DOI: 10.1016/j.jglr.2025.102511

Ryan A. Williams, Daniel J. Lizzadro-McPherson, Guy Meadows

A recently completed study has created and documented the first comprehensive compilation of spatio-temporal shoreline change for a significant portion of Lakes Michigan, Huron and Superior with historical snapshots dating back to 1938. In total, more than 4100 km was mapped at sufficient fidelity to allow resolution at the individual property owner level, allowing property owners, communities, regional managers and planners as well as regulatory agencies to directly observe not only natural changes to shorelines, but also anthropogenic impacts associated with shoreline hardening. Products produced by this study are publicly accessible via a geospatial data portal, and include historical aerial photography mosaics, historical shoreline and bluff line positions, long-term shoreline rate of change analysis input and outputs, and an interactive web-based viewer incorporating these products with other complementary datasets. Long-term rate of change analyses found that while some areas of Lakes Michigan and Huron exhibited isolated rates of recession greater than 1 m-per-year (m/yr), the majority of the shorelines were stable over the 82 years analyzed, with Lake Superior exhibiting the most stability (85 %), followed by Lake Huron (65 %), while Lake Michigan exhibited the lowest percentage of stable shorelines (52 %). Additionally, analysis of short-term rates-of-change shows the potential to detect shoreline hardening based on the variance between a transect’s short-term and long-term rates-of-change.

最近完成的一项研究首次对密歇根湖、休伦湖和苏必利尔湖的大部分地区进行了时空变化的综合汇编，并记录了1938年以来的历史快照。总共绘制了超过4100公里的保真度地图，使业主、社区、区域管理者和规划者以及监管机构不仅可以直接观察到海岸线的自然变化，还可以观察到与海岸线硬化相关的人为影响。本研究生成的产品可通过地理空间数据门户公开访问，包括历史航空摄影马赛克，历史海岸线和断崖线位置，长期海岸线变化率分析输入和输出，以及将这些产品与其他补充数据集结合起来的交互式网络查看器。长期变化率分析发现，虽然密歇根湖和休伦湖的一些地区表现出大于1米/年（m/yr）的孤立衰退率，但在分析的82年中，大多数海岸线是稳定的，苏必利尔湖表现出最稳定的（85%），其次是休伦湖（65%），而密歇根湖表现出最低的稳定海岸线百分比（52%）。此外，对短期变化率的分析显示了基于样带短期和长期变化率之间的差异来检测海岸线硬化的潜力。

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引用次数: 0

Development of a HAND-based flood risk assessment tool in Google Earth Engine for a data-scarce region in the US 谷歌Earth Engine中基于hand的洪水风险评估工具在美国数据稀缺地区的开发

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research

Pub Date : 2025-08-01 Epub Date: 2025-02-06 DOI: 10.1016/j.jglr.2025.102510

Jobin Thomas , Subhami Mohan , Saumik Mallik , Thomas Oommen , Pengfei Xue , Guy Meadows , Navin Tony Thalakkottukara , Ryan Williams

Despite the decreased disaster resilience of rural communities in the Great Lakes region to flooding, flood mitigation efforts have been impeded by inadequate data and lack of appropriate tools for understanding flood risk. Development of such resources often requires data and computationally intensive approaches, which are challenging in data-scarce conditions. This study presents the development of a web application in Google Earth Engine (GEE) for flood risk assessment. The application utilizes the Height Above the Nearest Drainage (HAND) model and synthetic rating curve (SRC) for fluvial flood inundation modeling, the Simulating WAves Nearshore (SWAN) model for coastal flood inundation modeling, the United States Geological Survey (USGS) regional regression equations for estimating peak discharge, and depth-damage functions of the HAZUS-MH flood model for estimating losses due to building-level impacts. The GEE-based geospatial web application, which is operational across five counties in the Western Upper Peninsula (WUP) of Michigan, fulfills the requirement of the community and decision-makers to assess the risks caused by flooding in the region. We demonstrated the applicability of the tool in the Ontonagon River, Michigan, and the results indicate the suitability of the platform for implementing decisions, long-term planning, and understanding flood risk with a reasonable degree of accuracy.

尽管大湖区农村社区对洪水的抗灾能力有所下降，但由于数据不足和缺乏了解洪水风险的适当工具，减轻洪水的努力受到阻碍。这类资源的开发往往需要数据和计算密集型方法，这在数据匮乏的条件下具有挑战性。本研究提出在谷歌Earth Engine （GEE）中开发一个用于洪水风险评估的web应用程序。该应用程序利用最近排水高度（HAND）模型和综合评级曲线（SRC）进行河流洪水淹没建模，模拟近岸波浪（SWAN）模型用于沿海洪水淹没建模，美国地质调查局（USGS）区域回归方程用于估计峰值流量，以及HAZUS-MH洪水模型的深度损伤函数用于估计建筑物水平影响造成的损失。基于gee的地理空间网络应用程序在密歇根州西部上半岛（WUP）的五个县运行，满足了社区和决策者评估该地区洪水造成的风险的要求。我们在密歇根州的Ontonagon河演示了该工具的适用性，结果表明该平台在实施决策、长期规划和理解洪水风险方面具有合理的准确性。

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引用次数: 0