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1,572 results for “Sedimentation”
Data from: The rainfall effect onto solidification and stabilization of heavy metal-polluted sediments
Rainfall makes impacts on process of solidification/stabilization and the long-term safety of solidified matrix. In this study, the effect of rainfall on solidification/stabilization process was investigated by rainfall test. The unconfined compressive strength (UCS) and toxicity characteristic leaching procedure (TCLP) were adopted to characterize the properties of S/S sediments before and after rainfall test. The samples cured for 28 days were subjected to semi-dynamic leaching tests with a simulated acidic leachant prepared at pH of 2.0, 4.0 and 7.0. Effectiveness of S/S treatment was evaluated by diffusion coefficient (D_e) and leachability index (LX). The results indicated that UCS decreased at maximum deterioration rate of 34.29% of the compressive strength after 7 days of curing, along with minimum rate of 7.89% after 28 days by rainfall, with >14 days referred. The rainfall had little effect on the leaching characteristics of heavy metals during the curing process. The simulated acid rain could make significant impacts on the leaching behavior of the heavy metals in the S/S materials. All cumulative fraction of leached heavy metals were less than 2.0 % which showed the good stabilization of cement. Furthermore, the calculated diffusion coefficient (D_e) for Cu was 1.28×10-11〖cm〗^2/s, indicating that its mobility was relatively low of heavy in S/S sediments. The calculated diffusion coefficient (Di) for Cd, Cu and Pb were 7.44×10-11, 8.18×10-12 and 7.85×10-12〖cm〗^2/s respectively, indicating that its mobility was relatively low of heavy metal in S/S sediments.
Dataset Sediment Analysis between Batu Ferringhi Coastline and Persiaran Bayan Indah Reclamation Site, Penang, Malaysia
<p>This dataset provided data analysis in research aimed to differentiate the characteristics between natural and anthropogenic coastal landforms in Penang. Two methods were used here are GPR-Ground Penetrating Radar and sediment sampling analysis. However, the dataset provided in this paper is only for sediment analysis. All GPR radar facies are presented in the research paper.<br> <br> Two sites were selected for this study - the Batu Ferringhi area, representing the natural coastal landform (labelled as BF) and the Persiaran Bayan Indah (parking lot of the Queensbay Mall), later labelled as QB representing the anthropogenic coastal landform. Five sediment samples were collected from each site. Sample BF1, BF2, BF3, BF4 and BF5; and sample QB1, QB2; QB3; QB4; and QB5. These data then calculated for mode, mean, skewness, sorting and kurtosis. All graphic are available in the research paper.</p>
Data for manuscript: An ecogeomorphic framework coupling sediment modeling with invasive riparian vegetation dynamics
<p>Datasets (aside from the publicly available GIS datasets) used in the analyses presented in the manuscript "An ecogeomorphic framework coupling sediment modeling with invasive riparian vegetation dynamics." </p>
Data from: How sea-level change mediates genetic divergence in coastal species across regions with varying tectonic and sediment processes
Plate tectonics and sediment processes control regional continental shelf topography. We examine the genetic consequences of how glacial-associated sea-level change interacted with variable near-shore topography since the last glaciation. We reconstructed the size and distribution of areas suitable for tidal estuary formation from the Last Glacial Maximum, ~20 thousand years ago, to present from San Francisco, California, USA (~38 °N) to Reforma, Sinaloa, Mexico (~25 °N). We assessed range-wide genetic structure and diversity of three co-distributed tidal estuarine fishes (California Killifish, Shadow Goby, Longjaw Mudsucker) along ~4,600 km using mitochondrial control region and cytB sequence, and 16–20 microsatellite loci from a total of 524 individuals. Results show that glacial-associated sea-level change limited estuarine habitat to few, widely separated refugia at glacial lowstand, and present-day genetic clades were sourced from specific refugia. Habitat increased during postglacial sea-level rise and refugial populations admixed in newly formed habitats. Continental shelves with active tectonics and/or low sediment supply were steep and hosted fewer, smaller refugia with more genetically differentiated populations than on broader shelves. Approximate Bayesian computation favored the refuge-recolonization scenarios from habitat models over isolation by distance and seaway alternatives, indicating isolation at lowstand is a major diversification mechanism among estuarine (and perhaps other) coastal species. Because sea-level change is a global phenomenon, we suggest this top-down physical control of extirpation-isolation-recolonization may be an important driver of genetic diversification in coastal taxa inhabiting other topographically complex coasts globally during the Mid- to Late Pleistocene and deeper timescales.
Data from: When environmental factors become stressors: interactive effects of vermetid gastropods and sedimentation on corals
Environmental stressors often interact, but most studies of multiple stressors have focused on combinations of abiotic stressors. Here we examined the potential interaction between a biotic stressor, the vermetid snail Ceraesignum maximum, and an abiotic stressor, high sedimentation, on the growth of reef-building corals. In a field experiment, we subjected juvenile massive Porites corals to four treatments: (i) neither stressor, (ii) sedimentation, (iii) vermetids or (iv) both stressors. Unexpectedly, we found no effect of either stressor in isolation, but a significant decrease in coral growth in the presence of both stressors. Additionally, seven times more sediment remained on corals in the presence (versus absence) of vermetids, likely owing to adhesion of sediments to corals via vermetid mucus. Thus, vermetid snails and high sedimentation can interact to drive deleterious effects on reef-building corals. More generally, our study illustrates that environmental factors can combine to have negative interactive effects even when individual effects are not detectable. Such 'ecological surprises' may be easily overlooked, leading to environmental degradation that cannot be anticipated through the study of isolated factors.
Denitrification rates in lake sediments of mountains affected by high atmospheric nitrogen deposition
<p>During the last decades, atmospheric nitrogen loading in mountain ranges of the Northern Hemisphere has increased substantially, resulting in high nitrate concentrations in many lakes. Yet, how increased nitrogen has affected denitrification, a key process for nitrogen removal, is poorly understood. We measured actual and potential (nitrate and carbon amended) denitrification rates in sediments of several lake types and habitats in the Pyrenees during the ice-free season. Actual denitrification rates ranged from 0 to 9 μmol N<sub>2</sub>O m<sup>−2</sup> h<sup>−1</sup> (mean, 1.5 ± 1.6 SD), whereas potential rates were about 10-times higher. The highest actual rates occurred in warmer sediments with more nitrate available in the overlying water. Consequently, littoral habitats showed, on average, 3-fold higher rates than the deep zone. The highest denitrification potentials were found in more productive lakes located at relatively low altitude and small catchments, with warmer sediments, high relative abundance of denitrification nitrite reductase genes, and sulphate-rich waters. We conclude that increased nitrogen deposition has resulted in elevated denitrification rates, but not sufficiently to compensate for the atmospheric nitrogen loading in most of the highly oligotrophic lakes. However, there is potential for high rates, especially in the more productive lakes and landscape features largely govern this.</p>
Sediment oxygen flux in the NGOM hypoxic zone
<p><span>The northern Gulf of Mexico (NGOM) coastal shelf adjacent to the Mississippi and Atchafalaya rivers system experiences strong seasonal hypoxia in the late summer and coupled physical-biological models suggest that hypoxia formation in the NGOM is sensitive to benthic biogeochemical processes. However, the processes driving sediment oxygen consumption and their relationship to bottom oxygen concentration remain enigmatic. This study for the first time concurrently measured in situ total oxygen uptake (TOU) and diffusive oxygen uptake (DOU) during two different hypoxia seasons. The relatively large TOU:DOU ratio of 1.9 ± 0.5 observed during this study suggests more significant benthic infauna community activity driving oxygen fluxes than previously thought. Future hypoxia models for this region should consider the role of fauna mediated oxygen consumption in biogeochemical variables.</span></p>
Radionuclide, organic matter, geochemical and colorimetric properties of potential source material and target sediment for conducing sediment fingerprinting approaches in the Dzoumogné reservoir, Mayotte Island, France
<p>The current dataset was compiled to study sediment fingerprintings practices, i.e tracer selection and contribution modelling. Colorimetric properties analysed with a portable diffuse reflectance spectrophotometer (Konica Minolta CM-700d) and geochemical contents obtained with an energy dispersive X-ray fluorescence spectrometer (ED-XRF Epsilon 4), organic matter and stable isotopes were analysed by EA-IRMS and radionuclides using coaxial N- and P- type HPGe detectors (Canberra/Ortec). These properties were analysed in potential source material that may supply sediment to the Dzoumogné reservoir, Mayotte island, France. Three potential soil source materials (n = 57) were considered: cropland (n = 29), forest (n = 13) and subsurface material originating from channel bank collapse, landslides, badlands (n = 16). A sediment core was collected in the Dzoumogné reservoir (Target) on the 8th October 2021 and 20 layers were sampled.</p><p>The current dataset comprises two Excel files including the metadata description and the data itself.</p>
Dataset: Quantifying the effects of heterogeneities on cohesive sediment erosion
<p>This dataset includes the raw data of the erosion tests and the results with the proposed method from each test case.</p>
Phytoplanktonic polysaccharide-mediated sedimentation of particulate organic carbon triggers lagged methane emissions
<p>Reservoirs act as carbon sinks when sedimentation of particulate organic carbon (POC) exceeds CO<sub>2</sub> and CH<sub>4 </sub>emissions. Here, we study the poorly explored process where phytoplankton-derived acidic polysaccharides (APs) aggregate into particulate organic matter, promoting carbon export to sediments. This source of particulate organic carbon (POC) in sediments can mineralize to CO<sub>2</sub> and CH<sub>4</sub> over various timescales. Our research, centered on a Mediterranean reservoir, elucidates phenological trends of APs and POC sedimentation and identifies their predominant drivers. Our findings present synchronic sedimentation patterns of POC and APs but identify a two-week delay between POC sedimentation and CH<sub>4 </sub>emissions. Despite its eutrophic status, our data demonstrate that this reservoir acts as a carbon sink by sequestering 4.33 g C m<sup>-2 </sup>y<sup>-1</sup>, which accentuates the importance of temporal integration at multiple scales when analyzing carbon budget within reservoirs.</p>
Video for learning-based prediction of the particles catchment area of PAP sediment traps
<p>The ocean biological carbon pump plays a major role in climate and biogeochemical cycles. Photosynthesis at the surface produces particles that are exported to the deep ocean by gravity. Sediment traps, which measure the deep carbon fluxes, help to quantify the carbon stored by this process. However, it is challenging to precisely identify the surface origin of particles trapped thousands of meters deep because of the influence of ocean circulation on the carbon sinking path. In this study, we conducted a series of numerical Lagrangian experiments in the Porcupine Abyssal Plain region of the North Atlantic and developed a machine learning approach to predict the surface origin of particles trapped in a deep sediment trap.This new tool provide a better link between satellite-derived sea surface observations and deep sediment trap measurements, ultimately improving our understanding of the biological carbon pump mechanism.</p>
Oxygen concentration profiles data and code from: Langet et al., 2023, Single-celled bioturbators: benthic foraminifera mediate oxygen penetration and prokaryotic diversity in intertidal sediment
<p>This archive contains the data of measured oxygen profile and the scripts used to generate the oxygen surface fluxes for the article</p><p>Langlet, D., Mermillod-Blondin, F., Deldicq, N., Bauville, A., Duong, G., Konecny, L., Hugoni, M., Denis, L., and Bouchet, V. M. P.: Single-celled bioturbators: benthic foraminifera mediate oxygen penetration and prokaryotic diversity in intertidal sediment, Biogeosciences, 20, 4875–4891, https://doi.org/10.5194/bg-20-4875-2023, 2023.</p>
The Sediment Thickness Model for Andalusia (STMA) data, intermediate data and scripts
<p>This dataset contains the Sediment Thickness Model for Andalusia (South of Spain), the GroundHog files and the consulting scripts linked to the paper "Thickness model of Andalusian's nearshore and coastal inland topography " under review in <i>Journal of Marine Science and Engineering</i>.</p><p>The following ZIP files can be found here:</p><p>===============<br><strong>STMA.zip</strong></p><p>A dataset of 108 ESRI ASCII grid files group by province (Almeria, Cadiz, Granada, Huelva and Malaga) and by physiographic zone (18). Each zone has six different files named as:</p><p>PZZ_V_T_S.asc</p><p>where,</p><p>P: It is the first letter of the province (e.g. A for Almeria, C for Cadiz…)</p><p>ZZ: number of physiographic zone from a minimum number of 2 to 6 in each province. Each province was divided by different overlapping rectangles following on the orientation of the coastline, the shape of the continental shelf, river intersections, capes, the main sediment type, and the level of influence from atmospheric and maritime weathering agents, primarily.</p><p>V: the model version</p><p>T: Type of sediment, Consolidated (C) and Unconsolidated (U)</p><p>S: Grain size, Fine (F), Sand (S) and Gravel (G)</p><p>e.g. the file A01_1_C_F.asc is the province of Almeria, zone 01, version 1, Consolidated sediment and Fine fraction.</p><p>All files have a projection file (EPSG 25830) with the same name but a *.prj extension and a auxiliary file (*.asc.aux.xml) with additional information about the projection used. </p><p>===============<br><strong>Script.zip</strong></p><p>Specifically, three Pyqgis scripts and three Model Qgis: </p><ul><li><i>1_Add_STMA_by_province_and_zone.py</i>: to add the STMA to QGIS grouping the layers by province and zones.</li><li><i>2_Point_value_STMA.py:</i> to add the STMA value to a point sample layer.</li><li>3_Zonal_statistics_STMA.py: to calculate the zonal statistics of STMA in a polygon area.</li><li>1_Volume_STMA.model3: Calculate the volume of each material (six raster layer) in one zone.</li><li>2_Volume_STMA_Clip.model3: Calculate the volume of each material in a clip area using a polygon layer.</li><li>3_Zonal_statistics_STMA.model3: Zonal statistics of the STMA in a polygon layer. It is a model version of the last pyqgis script 3_Zonal_statistics_STMA.py.</li></ul><p>The first two models could be used in a batch processing if the user needs information of more than one zone.</p><p>===============<br><strong>GroundHog.zip</strong></p><p>Five folders, one for each province, with information to open the models in Groundhog software.</p><p> </p>
CoUDlabs_WP8_T812_IKT_001 Permeable pavement clogging assessment using sediments with different properties
<p>This dataset includes raw and processed data from a series of laboratory tests that were conducted to develop and assess new and existing methods for analysing pavement performance and to gain insights into how these systems operate during their lifetime. The test method and specification used are based on the standards set by the Deutsches Institut für Bautechnik (DIBt), the German Institute for Construction Engineering. The tests are focused on determining hydraulic permeability and material retention of a cobblestone pavement with permeable joints under different sources of contamination, such as plastic dust and particulate sediments with different granulometries. The work is part of a joint research line between IKT and UDC towards the development of standardised methods to assess the long-term behaviour of different permeable pavement types during their lifetime. Data may be used to increase knowledge on permeable pavement clogging, allowing for developing improved design and maintenance strategies to optimise the long-term performance of permeable pavements.</p><p>This dataset is a result from the Joint Research Activity 3 (WP8, Improving Resilience and Sustainability in Urban Drainage solutions), Task 8.1.2. (Development of Scalable Measurement Protocols to Assess the Pollutant Retention and Release potentials of Urban Drainage Structures) within Co-UDlabs project, funded under the European Union's Horizon 2020 research and innovation program under grant agreement No 101008626. </p>
Data from: Plankton recruitment from coastal sediments under different temperature and light treatments
<p><span>In highly seasonal systems, the emergence of planktonic resting stages from the sediment is a key driver for bloom timing and plankton community composition. The termination of the resting phase is often linked to environmental cues, but the extent to which recruitment of resting stages is affected by climate change remains largely unknown for coastal environments. Here we investigate phyto- and zooplankton recruitment from oxic sediments in the Baltic Sea in a controlled experiment under proposed temperature and light increase during the spring and summer. We find that emergence of resting stage differs between seasons and the abiotic environment. Phytoplankton recruitment from resting stages were high in spring with significantly higher emergence rates at increased temperature and light levels for dinoflagellate and cyanobacteria than for diatoms, which had highest emergence under cold and dark conditions. In comparison, copepod hatchlings were most abundant in summer and emergence was not affected by increased temperature and light levels. These results show that activation of plankton resting stages are affected to different degrees by increasing temperature and light levels, indicating that climate change affects plankton dynamics through processes related to resting stage termination with potential consequences for bloom timing, community composition and trophic mismatch.</span></p>
Duplex Underplating, Sediment Dehydration and Quartz Vein Mineralization in the Deep Tremor Source Region
<p>Data for Duplex Underplating, Sediment Dehydration and Quartz Vein Mineralization in the Deep Tremor Source Region</p>
Data from: dammed ponds! a study of post-fire sediment and carbon dynamics in beaver ponds and their contributions to watershed resilience
<p>Beaver ponds were surveyed as part of an effort to quantify post-fire sediment dynamics in beaver ponds. Forty-eight beaver ponds in the northern Colorado Rocky Mountains were surveyed between June and August, 2022. We quantified the current and remaining sediment storage capacities within ponds with sediment depth surveys, and we calculated sedimentation rates by analyzing stratigraphy within pond sediment cores.</p>
A genome catalogue of mercury-methylating bacteria and archaea from sediments of a boreal river facing human disturbances
<p>Methyl mercury is a toxic compound produced by anaerobic microbes that biomagnifies in aquatic food webs, impacting animal and human health. Genome-based explorations of Hg methylators remain limited, particularly in the context of river ecosystems. To fill this knowledge gap, we created a genome catalogue of putative Hg-methylating microorganisms (based on the presence of <em>hgcAB</em>) from the sediments of a river impacted by two run-of-river hydroelectric dams, logging, and a wildfire. By using genome-resolved metagenomics, we uncovered a unique and diverse assemblage of Hg methylators dominated by members of the metabolically versatile Bacteroidota and particularly enriched in butyrate fermentative microbes. By comparing diversity and abundance of Hg methylators between sites that were subjected to different disturbances, we found that ongoing disturbances, such as input of organic matter related to logging activities. were particularly favorable to the establishment of a Hg-methylating niche. Lastly, for a deeper understanding of the environmental factors shaping Hg methylator diversity, we juxtaposed the Hg-methylating genome catalogue with the wider microbial community. The results suggest that Hg methylators respond to environmental conditions similarly to overall microbial community, and therefore it is crucial to interpret the diversity and abundance of Hg methylators within their specific ecological context.</p>
Data for "Turbulence Intermittency Effects on the Initiation Threshold of Sediment Motion in Natural Waters"
<p>Data used for the plots and tables can be found. </p> <p>1) <strong>timeseries.nc </strong>is used for producing figure 3.</p> <p>2) <strong>Scatter.xlsx </strong>is used for producing figure 4.</p> <p>3) <strong>Cal.xlsx </strong>is used for producing figures S2 S3.</p> <p>4) <strong>Graindis.xlsx </strong>is used for producing figure S4.</p> <p>5) <strong>modified_taucr.m </strong>is the modified equation code from this study.</p>
Dataset for 'Can restoring water and sediment fluxes across a mega-dam cascade alleviate a sinking river delta?'
<p>Please cite this dataset and corresponding manuscript at <a href="https://doi.org/10.1126/sciadv.adn9731">10.1126/sciadv.adn9731</a> if data were used in any way.</p> <p>Correspondence to Prof Lu Xi Xi at geoluxx@nus.edu.sg</p>
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.