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Impact of the Yellow River capture on the paleoenvironmental changes of Hongze Lake, China

International Journal of Sediment Research 2023年第4期38卷 503-515页

作者： Hongwu Tang Ming Gao Saiyu Yuan Huiming Zhang Yang Xiao Fuxin Zhang Kun Zhang State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Hohai University Key laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water Resources Hohai University Institute of Water Science and Technology Hohai University

The Yellow River(YR) capture of the Huai River had a profound effect on the landscape evolution,ecology, and social development in China, disrupting the evolution of some vital shallow floodplain *** of the absence of lacustrine sediment provenance analysis, previous studies were inadequate in distinguishing the influence of YR capture on paleoenvironmental changes in these lakes, especially on landscape evolution, redox conditions, lake level changes, and organic productivity. The current study aims to use X-ray fluorescence-core scanning(XRF-CS) and multivariate statistics on a 9.8 m sediment core from Hongze Lake(HZL), China, to analyze the impact of the YR capture on the lake’s paleoenvironmental changes and the sediment provenance simultaneously. High-resolution images, magnetic susceptibility, and XRF-based multi-element data were obtained using a GEOTEK Multi-Sensor Core Logger. The calcium(Ca) content indicates the presence of YR sediment in HZL, given the high Ca content in YR sediment and the identification of mainly exogenous sources of Ca in HZL. The high values of Ca indicate that 48.7% of the sediment in the center of HZL is related to the YR’s incursion. Periods of higher Ca content coincide with periods of higher oxygenation levels of the lake(as indicated by the ratio of manganese to titanium) and lower organic content in the lake sediment(as indicated by the ratio of incoherent to coherent scatter). These analyses reveal that the YR’s capture of HZL significantly increased the lake’s oxygen level. Furthermore, the decrease in the organic content of sediment tends to be the result of the accelerated deposition caused by the YR. The decrease in Ca content coincides with an increase in lake levels(as indicated by magnetic susceptibility). Thus, it can be inferred that the embankment on the eastern side of HZL, built to increase lake storage, has reduced the incursion frequency of the YR.

关键词： Yellow River capture Paleoenvironmental reconstruction XRF-CS Hongze Lake

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An Approach for Quantifying the Influence of Seepage Dissolution on Seismic Performance of Concrete Dams

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Computer Modeling in Engineering & Sciences 2022年第4期131卷 97-117页

作者： Shaowei Wang Cong Xu Hao Gu Pinghua Zhu Hui Liu Bo Xu School of Environmental and Safety Engineering Changzhou UniversityChangzhou213164China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing210029China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing210098China College of Hydraulic Science and Engineering Yangzhou UniversityYangzhou225009China

Many concrete dams seriously suffer from long-term seepage dissolution,and the induced mechanical property deterioration of concrete may significantly affect the structural performance,especially the seismic *** approach is presented in this paper to quantify the influence of seepage dissolution on seismic performance of concrete *** connect laboratory test with numerical simulation,dissolution tests are conducted for concrete specimens and using the cumulative relative leached calcium as an aging index,a deterioration model is established to predict the mechanical property of leached concrete in the first step.A coupled seepage-calcium dissolutionmigrationmodel containing two calculation modes is proposed to simulate the spatially non-uniformdeterioration of concrete *** on the simulated state of a roller compacted concrete dam subjected to 100 years of seepage dissolution,seismic responses of the damare subsequently *** which the nonlinear cracking of concrete,the radiation damping of the far-field foundation is *** results show that seepage dissolution will seriously weaken the seismic safety of concrete dams because of the dissolution-induced decrease of effective thickness of the dam *** upstream surface,dam toe and gallery wall suffer from a large degree of dissolution,whereas it is minimal and basically the same inside the dam body,at a degree of 0.19%within 100 *** horizontal displacements of dam crest under the design static load and fortification against earthquake increase by 6.9%and 21.9%,respectively,and the dissolution-induced seismic cracking leads to the failure of dam anti-seepage *** study can provide engineers with a reference basis for reinforcement decision of old concrete dams.

关键词： Concrete dams seepage dissolution deterioration prediction model seismic performance failure mode

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laboratory-scale investigation of the material distribution characteristics of landslide dams in U-shaped valleys

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Journal of Mountain Science 2023年第3期20卷 688-704页

作者： JIAN Fu-xian CAI Zheng-yin GUO Wan-li Geotechnical Engineering Department Nanjing Hydraulic Research InstituteNanjing 210024China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Nanjing 210024China

Material distribution characteristics during sliding and depositing is particularly significative to investigate the internal structure and spatial variation of landslide dams,which are fundamentally determining the mechanical and hydraulic behavior and the susceptibility to cause dam ***,limited by longevity shortages and special geographic environments,the material distribution characteristics and their formation mechanisms are difficult to observe in the ***,an experimental apparatus modeling a landslide dam was developed in this paper,designing three sampling methods with two valley *** internal deposit characteristics,void ratio variation and relative content of the particle size range(PSR)were analyzed,and the mechanics of deposit structure were also delicately *** results indicate that granular material deposited in valley shows a structure of inverse grain size accumulation in both vertical and horizontal directions,exhibiting spatial variability of particle gradation and void *** characteristic PSR decreases from 22-30 mm in the two-dimensional state to 10-14 mm in the threedimensional *** excitation and vibration sieve are the intrinsic mechanisms of granular flow segregation,intrinsically inducing the formation of inverse grading deposit ***,spatial variability in size is mainly trig gered by segregation,whereas coarse particle content and deposition boundaries merely exacerbate the difference degree.

关键词： Landslide dam IInverse grading structure Granular flow segregation Material spatial variability Deposit characteristics

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A review on SnFe2O4 and their composites: Synthesis, properties, and emerging applications

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Progress in Natural Science:Materials International 2022年第5期32卷 517-527页

作者： Hongru Han Yi Luo Yuefa Jia N.Hasan Chunli Liu School of Water and Environment Chang'an University Key laboratory of Subsurface hydrology and Ecological Effects in Arid Region (Chang'an University) Department of Physics and Oxide Research Center Hankuk University of Foreign Studies

Tin ferrite(SnFe2O4) and their composites have been extensively studied due to their unique functional properties including appealing electronic band structure, good chemical stability, high magnetization, excellent biocompatible and earth-abundant nature. Over the past few years, SnFe2O4and their composites have been well designed and investigated for various kind of applications. In this review, the most important methods for SnFe2O4and their composites synthesis, such as co-precipitation, hydrothermal, solvothermal and sol-gel techniques are summarized. It is important to emphasize that this review mainly focuses on the application of SnFe2O4and their composites for environmental remediation, lithium-ion batteries and hydrogen peroxide sensors, which are discussed in detail for the first time. Apart from that, the key factors and essential means to improve their performance and functionality are systematically reported. Finally, the development prospect and challenge of SnFe2O4and their composites are introduced. It is anticipated that this review will be helpful in development of SnFe2O4and their composites with ameliorated performances for practical application in various fields.

关键词： SnFe 2 O 4 Synthesis Environmental remediation Lithium-ion batteries Hydrogen peroxide sensors

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Initiatives to clarify mechanisms of hydrological evolution in human-influenced Yellow River Basin

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Water Science and Engineering 2023年第2期16卷 117-121页

作者： Li-liang Ren Shan-shui Yuan Xiao-li Yang Shan-hu Jiang Gui-bao Li Qiu-an Zhu Xiu-qin Fang Yi Liu Yi-qi Yan State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China College of hydrology and Water Resources Hohai UniversityNanjing 210098China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210098China Chinese Hydraulic Engineering Society Beijing 100053China hydrology Bureau Yellow River Conservancy CommissionMinistry of Water ResourcesZhengzhou 450003China

Significant changes in water cycle elements/processes have created serious challenges to regional sustainability and high-quality development in the Yellow River Basin in *** is necessary to investigate the impacts of climate change and human activities on hydrological evolution and disaster risk from a holistic perspective of the *** study developed initiatives to clarify the mechanisms of hydrological evolution in the human-influenced Yellow River *** proposed research method includes:(1)a tool to simulate multiple factors and a multi-scale water cycle using a grid-based spatiotemporal coupling approach,and(2)a new algorithm to separate the responses of the water cycle to climate change and human impacts,and de-couple the eco-environmental effects using artificial intelligence *** this research framework,key breakthroughs are expected to be made in the understanding of the impacts of land cover change on the water cycle and blue/green water *** outcomes of this research project are expected to provide theoretical support for ecological protection and water governance in the basin.

关键词： Climate change Human activities Hydrological evolution Runoff change Yellow River Basin

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Evolution of cavity size and energy conversion due to droplet impact on a water surface

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Chinese Journal of Chemical Engineering 2023年第10期62卷 261-269页

作者： Wan Xu Dekui Yuan Hongguang Sun Tong Guo Fengze Zhao Huimin Ma Changgen Liu Department of Mechanics Tianjin UniversityTianjin 300350China State Key laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China

The deformation characteristics of the cavity due to droplet impact on a water surface are experimentally *** analysis shows that the characteristic values of time,depth,and horizontal diameter can be taken as 10^(-3)times the ratio of surface tension to the product of viscosity coefficient and gravitational acceleration,the maximum depth,and the maximum horizontal diameter,*** evolutions of the dimensionless cavity sizes for different values of Weber number(We)coincide for 220

关键词： Droplet impact Cavity size Energy conversion

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Fly Ash/Paraffin Composite Phase Change Material Used to Treat Thermal and Mechanical Properties of Expansive Soil in Cold Regions

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Journal of Renewable Materials 2022年第4期10卷 1153-1173页

作者： Yong Chen Yinghao Huang Min Wu Shuo Wang Geotechnical Engineering Department Nanjing Hydraulic Research InstituteNanjing210024China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Science Nanjing210029China

Phase change materials(PCMs)can store large amounts of energy in latent heat and release it during phase changes,which could be used to improve the freeze-thaw performance of *** composite phase change material was prepared with paraffin as the PCM and 8%Class C fly ash(CFA)as the supporting *** tests were conducted to reveal the influence of phase change paraffin composite Class C fly ash(CFA-PCM)on the thermal properties,volume changes and mechanical properties of expansive *** results show that PCM failed to establish a good improvement effect due to *** can effectively adsorb phase change materials,and the two have good ***-PCM reduces the volume change and strength attenuation of the soil,and 8 wt.%PCM is the optimal ***-PCM turns the phase change latent heat down of the soil and improves its thermal ***-PCM makes the impact small of freeze-thaw on soil pore structure damage and improves soil volume change and mechanical properties on a macroscopic *** addition,CFA-8 wt.%PCM treated expansive soil has apparent advantages in resisting repeated freeze-thaw cycles,providing a reference for actual engineering design.

关键词： Composite phase change material freeze-thaw performance expansive soil thermal properties mechanical properties

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Storage and redistribution of anthropogenic CO_(2) in the western North Pacific:The role of subtropical mode water transportation

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Fundamental Research 2024年第1期4卷 103-112页

作者： Cheng-long Li Lei Han Wei-dong Zhai Di Qi Xu-chen Wang Hong-mei Lin Li-wen Zheng Institute of Marine Science and Technology Shandong UniversityQingdao 266237China China-ASEAN College of Marine Science and Technology Xiamen University MalaysiaSelangorMalaysia Southern Marine Science and Engineering Guangdong laboratory(Zhuhai) Zhuhai 519080China Polar and Marine Research Institute Jimei UniversityXiamen 361021China Key laboratory of Marine Chemistry Theory and Technology and Frontiers Science Center for Deep Ocean Multispheres and Earth SystemMinistry of EducationOcean University of ChinaQingdao 266100China Center for Isotope Geochemistry and Geochronology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Weihai Institute of Marine Ecology and Economy Research Weihai 264400China

Oceanic uptake and storage of anthropogenic CO_(2)(CANT)are regulated by ocean circulation and *** decipher the storage and redistribution of CANT in the western North Pacific,where a major CANT sink develops,we investigated the water column carbonate system,dissolved inorganic radiocarbon and ancillary parameters in May and August 2018,spanning the Kuroshio Extension(KE,35-39°N),Kuroshio Recirculation(KR,27-35°N)and subtropical(21-27°N)*** column CANT inventories were estimated to be 40.5±1.1 mol m^(-2) in the KR zone and 37.2±0.9 mol m^(-2) in the subtropical *** comparison with historical data obtained in 2005,relatively high rates of increase of the CANT inventory of 1.05±0.20 and 1.03±0.12 mol m^(-2) yr^(-1) in the recent decade were obtained in the KR and subtropical zones,*** water-mass-based analyses suggest that formation and transport of subtropical mode water dominate the deep penetration,storage,and redistribution of CANT in those two *** the KE zone,however,both the water column CANT inventory and the decadal CANT accumulation rate were small and uncertain owing to the dynamic hydrology,where the naturally uplifting isopycnal surfaces make CANT penetration relatively *** findings of this study improve the understanding of the spatiotemporal variations of CANT distribution,storage,and transport in the western North Pacific.

关键词： Oceanic CO_(2)uptake Anthropogenic CO_(2)storage Subtropical mode water Kuroshio extension Kuroshio recirculation Western North Pacific

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Wheat Breeding Strategies under Climate Change based on CERES-Wheat Model

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Computers, Materials & Continua 2022年第9期72卷 6107-6118页

作者： Jintao Cui Jihui Ding Sheng Deng Guangcheng Shao Weiguang Wang Xiaojun Wang Yesilekin Nebi College of hydrology and Water Resources Hohai UniversityNanjing210098China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing210098China College of Agricultural Science and Engineering Hohai UniversityNanjing210098China Institute of Rural Water Conservancy Jiangxi Academy of Hydro ScienceNanchang330029China State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing210029China International Agricultural Research and Training Center Ministry of Agriculture and ForestryIzmir35660Republic of Turkey

Climate change has inevitably had a negative impact on agricultural production and food *** breeding improvement is an efficient option to adapt to future climate and increase grain *** study the potential to provide valuable advice for breeding under climate change condition,the crop growth model was used as basis to investigate,the effects of the cultivar genotype parameters of the crop estimation through resource and environment synthesis-wheat(CERES-Wheat)model on yield under different climate *** this study,solar radiation had a positive effect on the yield of winter wheat,while the effects of daily temperature change conditions on yield were vague,particularly under a change in daily maximum *** the seven cultivar genotype parameters in the CERES-Wheat model,the yield had an approximately linear increasing relationship with kernel number(G1)and kernel size(G2).Vernalization days(P1V)had a fluctuating effect on winter yield without an evident unidirectional *** yield of winter wheat increased with an increase in photoperiodic response(P1D)when P1D values varied from 64.81 to *** interval(PHINT)had a positive impact on the yield of winter *** study presented the potential benefits of the crop growth model to provide directional suggestions for crop breeding.

关键词： DSSAT genotype parameters winter wheat breeding climate change

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Swimming behavior of juvenile silver carp near the separation zone of a channel confluence

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International Journal of Sediment Research 2022年第1期37卷 122-127页

作者： Saiyu Yuan Lei Xu Hongwu Tang Yang Xiao Colin Whittaker State Key laboratory of hydrology-Water Resources and Hydraulic Engineering Hohai University Yangtze Institute for Conservation and Development Department of Civil and Environmental Engineering The University of Auckland

Knowledge of locomotion of fish near river confluences is important for prediction of fish distribution in a river *** flow separation zone near the confluence of a river network is a favorite habitat and feeding place for silver carp,which is one of the four major species of Chinese carp and usually provides positive rheotaxis to water *** the current study,a series of laboratory experiments were done to determine the behavioral responses of juvenile silver carp to the hydrodynamic forces near the separation zone of a channel *** locomotion and trajectory of juvenile silver carp were recorded by infrared thermal imaging,while the flow velocity field near the separation zone was measured by a Particle Image Velocimetry (PIV) system.A total of 60 juvenile silver carp were released near the separation zone among which 40 carp swam in the upstream *** them,24 carp swam to the tributary and the remaining 16 swam into the main *** all these 24 carp travelled initially along the boundary of the separation zone near the corner,where flow shear was strongest,and then swam to the *** of avoiding zones of strong vorticity,they chose and followed a trajectory along which the flow vorticity was *** encountering these vortical flows,they increased the tailbeat frequency and decreased the tail-beat amplitude to maintain body *** observations provide important knowledge on locomotion of fish near river confluences and are beneficial for the fish habitat protection.

关键词： Channel confluence Flow separation Juvenile silver carp Fish locomotion

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