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Evaluating pixel-based ***-based image analysis approaches for lithological discrimination using VNIR data of WorldView-3

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Frontiers of Earth Science 2021年第1期15卷 38-53页

作者： Samira SHAYEGANPOUR Majid H.TANGESTANI Saeid HOMAYOUNI Robert K.VINCENT Department of Earth Sciences Faculty of SciencesShiraz UniversityShiraz ***Iran centre eau terre environnement Insitut National de la Recherche ScientifiqueQuebec QCJ3X1S2Canada Department of Geography Bowling Green State UniversityOhio 43403-0001USA

The object-based against pixel-based image analysis approaches were assessed for lithological mapping in a geologically complex terrain using Visible Near Infrared(VNIR)bands of WorldView-3(WV-3)satellite *** study area is Hormuz Island,southern Iran,a salt dome composed of dominant sedimentary and igneous *** performing the object-based image analysis(OBLA)approach,the textural and spectral characteristics of lithological features were analyzed by the use of support vector machine(SVM)***,in the pixelbased image analysis(PBIA),the spectra of lithological end-members,extracted from imagery,were used through the spectral angle mapper(SAM)*** test samples were used in a confusion matrix to assess the accuracy of classification methods *** showed that OBIA was capable of lithological mapping with an overall accuracy of 86.54%which was 19.33%greater than the accuracy of *** also reduced the salt-and-pepper artifact pixels and produced a more realistic map with sharper lithological *** research showed limitations of pixel-based method due to relying merely on the spectral characteristics of rock types when applied to high-spatial-resolution VNIR bands of WorldView-3 *** is concluded that the application of an object-based image analysis approach obtains a more accurate lithological classification when compared to a pixel-based image analysis algorithm.

关键词： object-based image analysis pixel-based image analysis lithological mapping Worldview-3 Hormuz Island spectral angle mapper support vector machine

Critical review of EPS production, synthesis and composition for sludge flocculation

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Journal of Environmental Sciences 2018年第4期30卷 225-245页

作者： Klai Nouha Ram Saurabh Kumar Sellamuthu Balasubramanian Rajeshwar Dayal Tyagi Universite du Quebec Institut national de la Recherche Scientifique Centre Eau Terre & Environnement 490 de la CouronneQuebec G1K 9A9 Canada Institut Armand-Frappier 531 boul. des Prairies Laval Quebec H7V 1B7 Canada

Extracellular polymeric substances（EPS） produced by microorganisms represent biological macromolecules with unfathomable potentials and they are required to be explored further for their potential application as a bioflocculant in various wastewater sludge treatment. Although several studies already exist on biosynthetic pathways of different classical biopolymers like alginate and xanthan, no dedicated studies are available for EPS in sludge. This review highlights the EPS composition, functionality, and biodegradability for its potential use as a carbon source for production of other metabolites. Furthermore, the effect of various extraction methods（physical and chemical） on compositional, structural, physical and functional properties of microbial EPS has been addressed. The vital knowledge of the effect of extraction method on various important attributes of EPS can help to choose the suitable extraction method depending upon the intended use of EPS. The possible use of different molecular biological techniques for enhanced production of desired EPS was summarized.

关键词： Extracellular polymeric substances Metabolic pathways Extraction methods Flocculation properties

Quantitative assessment on basin-scale hydrological services of wetlands

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Science China Earth Sciences 2020年第2期63卷 279-291页

作者： Yanfeng WU Guangxin ZHANG Alain NROUSSeau Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China INRS-ETE/Institut National de la Recherche Scientifique-eau terre environnement Quebec G1K 9A9Canada

Despite recognizing the importance of hydrological function of wetlands, basin-scale wetlands services have rarely been investigated. The PHYSITEL/HYDROTEL modelling platform was used to quantitatively assess the impact of wetlands on quickflow and baseflow with paired simulation scenarios in Duobukuli River Basin, namely with wetlands and without *** results showed that wetlands exert significant impact on basin hydrological processes by decreasing streamflow and altering streamflow regime(magnitude, frequency, duration and time of flow events). The intensity(significant or not) of wetlands influences on quickflow had daily, monthly and annual variation. Wetlands significantly attenuated quickflow during flood season while slightly support daily, monthly and annual baseflow. The average quickflow attenuation and baseflow support of wetlands were 5.89% and 0.83%, respectively. Although the intensity and effect(mitigation or augment) of wetlands on streamflow temporally varied at daily, monthly, seasonal and annual scales, wetland overall mitigated quickflow and augment baseflow in Duobukuli River Basin. Our results could provide insights for future decision-making for rehabilitation and conservation of wetlands as well as integrated basin water resources management.

关键词： Wetlands modules Hydrological processes simulation Baseflow support Quickflow mitigation Hydrological function

Two-dimensional modeling of fine sediment transport with mixed sediment and consolidation: Application to the Gironde Estuary,France

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International Journal of Sediment Research 2021年第6期36卷 736-746页

作者： Sylvain Orseau Nicolas Huybrechts Pablo Tassi Damien Pham Van Bang Fabrice Klein Cerema Direction Technique Eau Mer et Fleuves Sorbonne Universités Université de Technologie de Compiégne CNRSFRE2012 RobervalCentre de Recherche Royallieu Electricité de France R&D Department Laboratoire d'Hydraulique Saint Venant (ENPC-EDF/R&D-CEREMA) 5. centre eau Terre et Environnement INRS-ETE 6. Grand Port Maritime de Bordeaux

In order to optimize ship navigation in the macrotidal Gironde Estuary, a recent project funded by the port of Bordeaux aims at better understand and forecast hydrodynamic and fine sediment transport within the estuary. In the framework of this project, a two-dimensional hydro-sedimentary model is built. The model includes hydrodynamic forcings, mixed-sediment transport, and consolidation processes. The harmonic analysis of the astronomical tides reveals a strong distortion of the tidal wave inducing the growth of overtide constituents and the non-significant effect of tide-surge interactions in annual-scale prediction. Depending on hydrological conditions, river discharge can considerably alter the model accuracy due to the migration of the turbidity maximum zone modifying the bottom *** with measurements shows the ability of the model to reproduce suspended-sediment concentrations in the central Estuary. Sensitivity of the model to sediment features has also been discussed in regard of suspended-sediment concentrations and fluid mud deposits. The model will be further coupled with ship squat predictions and a morphodynamic model.

关键词： Sediment transport Numerical modeling Mixed sediment Gironde Estuary Opentelemac

Comparative study on production and characterisation of extracellular polymeric substances(EPS)using activated sludge fortified with crude glycerol from different biodiesel companies

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Systems Microbiology and Biomanufacturing 2021年第2期1卷 208-222页

作者： Bhoomika Yadav S.K.Yellapu Kokou Adjalle P.Drogui R.D.Tyagi INRS eau Terre et Environnement490rue de la CouronneQuebec CityQC G1K 9A9Canada BOSK Bioproducts Quebec CityQCCanada

Extracellular polymeric substances(EPS)are eco-friendly and economical biopolymers with a significant role in pollutant removal,bio-flocculation,settling and dewatering of activated *** this study,growth profile and EPS production by an EPS-producing microbial strain(isolated from wastewater sludge or WWS)was studied using activated sludge fortified with *** study compared three crude glycerol samples as carbon sources from different biodiesel companies(BIO-LIQ,BIOCARDEL,ROTHSAY)and their effect on EPS production and characterisation was *** maximum slime EPS(S-EPS)concentration(12.34 g/L)was produced when sludge fortified with BIO-LIQ crude glycerol was used,higher than pure glycerol(10 g/L)at 72 *** S-EPS was enhanced(16 g/L)when purified BIO-LIQ glycerol(by acid treatment)was *** was also observed that S-EPS concentration increased 1.6-2.6 times by using sludge fortified with glycerol as compared to only glycerol(no sludge)as EPS production *** addition,the S-EPS produced from different glycerol samples yielded different characteristics in terms of protein-carbohydrate content,flocculation activity and *** S-EPS from purified BIO-LIQ glycerol(with sludge)gave maximum flocculation activity and dewaterability i.e.93.71%and 60.2%*** comparison between Ca(OH)2 and NaOH used as alkaline sludge pre-treatment methods revealed that the EPS produced from Ca(OH)_(2)-treated sludge fortified with glycerol solutions to be better in terms of protein content,flocculation activity and *** composition analysis using Fourier Transform Infrared Spectroscopy(FT-IR)revealed the presence of distinct functional groups(carboxyl,hydroxyl,amine groups)in the produced S-EPS.

关键词： Exopolysaccharides Bacterial polymers Slime Crude glycerol Activated sludge Impurities

The influence of proxy selection on global annual mean temperature reconstructions during the Common Era

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Science China Earth Sciences 2024年第8期67卷 2522-2534页

作者： Bao YANG Xia LI Minhui HE Feng WANG Yesi ZHAO Peng ZHANG Jianglin WANG Frontiers Science Center for Critical Earth Material Cycling School of Geography and Ocean ScienceNanjing UniversityNanjing 210023China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China centre eau terre environnement Institut National de la Recherche ScientifiqueQuébecQCG1K 9A9Canada GEOTOP Research centre in the Dynamics of the Earth System MontréalQC H2X 3Y7Canada

The reconstruction of global annual mean temperatures made by the PAGES 2k Consortium in 2019 represents one of the most influential sequences of global climate variability over the Common ***,it is still not clear how the reconstruction can be influenced by the selection of reconstruction methods and the selection of proxy records with different temporal resolutions over different *** adopt a widely used Composite-Plus-Scale method to elucidate the effects of the selection of the proxy records on temperature *** ensure the uniformity of data,different types of proxy records spanning the past~2000 years from the PAGES 2k proxy network were used to investigate the potential effects of proxy selection in hemispheric and global temperature reconstructions during the past two *** long-term trends,spectral characteristics,and volcanic responses of the annual temperatures were studied based on the *** results reveal a significant cooling trend in the global annual mean temperature using both tree-ring and non-tree-ring records during the 1–1850CE period,and show that the cooling exhibits a stronger trend in the Southern Hemisphere(SH)than that in the Northern Hemisphere(NH).Yet,the long-term trends vary according to different combinations of proxy *** reconstructions based on different types of proxies also exhibit different features in terms of volcanic responses and spectral ***-ring-based temperature reconstructions show stronger cooling responses to tropical volcanic eruptions,while non-tree-ring-based reconstructions suggest less robust volcanic responses,which may be related to dating uncertainties and low temporal resolution of the ***-ring width records tend to preserve a substantial proportion of high-frequency(200 years)*** are needed to reduce uncertainti

关键词： Millennial cooling trend Global climate change Proxy records Volcanic eruptions Spectral properties Common Era

Effect of self-weight consolidation on a hydro-sedimentological model for the Río de la Plata estuary

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International Journal of Sediment Research 2019年第5期34卷 444-454页

作者： Pablo Santoro Mónica Fossati Pablo Tassi Nicolas Huybrechts Damien Pham Van Bang Ismael Piedra-Cueva Instituto de Mecánica de los Fluidos e Ingeniería Ambiental Facultad de Ingeniería Universidad de la República Université Paris-Est Laboratory for Hydraulics Saint-Venant (ENPC-EDF/R& D-CEREMA) Electricity of France R&D Department Sorbonne Universités Université de Technologie de Compiègne FRE UTC-CNRS 3023 Roberval Centre de Recherche Royallieu Cerema Direction Technique Eau Mer et Fleuves Institut National de la Recherche Scientifique Centre-Eau Terre Environnement

The effect of the consolidation process on the morphodynamics and fine sediment dynamics of the Río de la Plata estuary is explored through a circulation-wave-sediment transport model. The consolidation model is calibrated based on settling column experimental data. Different simulations are done in order to initialize the mud layer distribution and to investigate the impact of different erosion parameter assumptions on the modeled sediment dynamics. Finally a two-year simulation is done with and without the consolidation process and realistic hydrodynamic forcings. Considering the consolidation process, the model correctly reproduces measured vertical density profiles in the Montevideo Bay access channel. The simulated suspended sediment dynamics behavior in Montevideo Bay with the consolidation process provides a more realistic deposition pattern in regard to the dredging activities.

关键词： Cohesive sediment Self-weight consolidation Morphodynamics Numerical modeling

Coupled thermo-hydro-mechanical simulation of CO2 enhanced gas recovery with an extended equation of state module for TOUGH2MP-FLAC3D

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 904-920页

作者： Yang Gou Zhengmeng Hou Mengting Li Wentao Feng Hejuan Liu Energy Research Center of Lower Saxony GoslarGermany Sino-German Energy Research Center Sichuan UniversityChengduChina Institute of Petroleum Engineering Clausthal University of TechnologyClausthal-ZellerfeldGermany Institut National de la Recherche Scientifique-eau terre environnement Research Center(INRS-ETE) QuébecCanada

As one of the most important ways to reduce the greenhouse gas emission,carbon dioxide（CO2）enhanced gas recovery（CO2-EGR） is attractive since the gas recovery can be enhanced simultaneously with *** on the existing equation of state（EOS） module of TOUGH2 MP,extEOS7C is developed to calculate the phase partition of H2O-CO2-CH4-NaCl mixtures accurately with consideration of dissolved NaCI and brine properties at high pressure and temperature *** show that it can be applied up to the pressure of 100 MPa and temperature of 150℃.The module was implemented in the linked simulator TOUGH2MP-FLAC3 D for the coupled hydro-mechanical simulations.A simplified three-dimensional（3D）1/4 model（2.2 km×1 km×1 km） which consists of the whole reservoir,caprock and baserock was generated based on the geological conditions of a gas field in the North German *** simulation results show that,under an injection rate of 200,000 t/yr and production rate of 200,000 sm3/d,CO2breakthrough occurred in the case with the initial reservoir pressure of 5 MPa but did not occur in the case of 42 *** low pressure conditions,the pressure driven horizontal transport is the dominant process;while under high pressure conditions,the density driven vertical flow is *** the considered conditions,the CO2-EGR caused only small pressure *** largest pore pressure increase（2 MPa） and uplift（7 mm） occurred at the caprock bottom induced by only *** caprock had still the primary stress state and its integrity was not *** formation water salinity and temperature variations of ±20℃ had small influences on the CO2-EGR *** order to slow down the breakthrough,it is suggested that CO2-EGR should be carried out before the reservoir pressure drops below the critical pressure of CO2.

关键词： Carbon dioxide (CO2) enhanced gas recovery (CO2-EGR) CO2 sequestration Equation of state (EOS) Coupled thermo-hydro-mechanical (THM) modeling TOUGH2MP-FLAC3D

Mantle plume trail beneath the ca.1.1 Ga North American Midcontinent Rift revealed by magnetotelluric data

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National Science Review 2024年第8期11卷 146-156页

作者： Wule Lin Adam Schultz Bo Yang Lyal B.Harris Xiangyun Hu Hubei Subsurface Multi-scale Imaging Key Laboratory School of Geophysics and Geomatics China University of Geosciences Department of Ocean Science and Engineering Southern University of Science and Technology Advanced Institute for Ocean Research Southern University of Science and Technology College of Earth Ocean and Atmospheric SciencesOregon State University Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences China-Pakistan Joint Research Center on Earth Sciences CAS-HEC eau terre environnement Research centre Institut National de la Recherche Scientifique

Whilst the 1.1 Ga North American Midcontinent Rift(MCR) system is formed in association with the Keweenaw mantle plume,the absence of a northern third rift arm or aulacogen(a general characteristic of mantle plumes) has previously not been well *** help clarify this unusual plume-rift relationship and to better establish the region affected by the Keweenaw mantle plume,we present the first electrical resistivity model of the MCR derived from 3D inversion of EarthScope USArray and Lithoprobe magneto telluric(MT) data,extending northwards into the Archean Superior *** model shows a prominent highly conductive anomaly trending NW-SE at the base of Western Superior's cratonic lithospheric mantle,cross-cutting and extending for over 300 km on both sides of the western rift *** propose that this anomaly reflects the ancient signature of a plume trail,resulting from metasomatism and/or partial melting of the sulfide-rich basal lithospheric mantle during impingement of the Keweenaw mantle plume.

关键词： magnetotelluric Midcontinent Rift Keweenaw mantle plume Superior Province North America