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TIDAL EFFECTS ON GROUNDWATER DYNAMICS IN COASTAL AQUI-FER UNDER DIFFERENT BEACH SLOPES

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Journal of Hydrodynamics 2012年第1期24卷 97-106页

作者： LIU Yi SHANG Song-hao mao xiao-min College of Water Conservancy and Civil EngineeringChina Agricultural UniversityBeijing 100083China State Key Laboratory of Hydroscicncc and Engineering Department of Hydraulic EngineeringTsinghuaUniversityBeijing 100084China College of Water Conservancy and Civil Engineering China Agricultural UniversityBeijing 100083China

The tide induced groundwater fluctuation and the seawater intrusion have important effects on hydrogeology and ecology of coastal *** previous studies,there were few quantitative evaluations of the joint effects of the beach slope and the tide fluctuation on the groundwater *** this article,a numerical model is built by using the software FEFLOW with consideration of seawater intrusion,tide effects,density dependent flow and beach sloping *** simulation results are validated by laboratory experimental data in *** numerical scenarios are designed in a practical scale with different beach *** show that the groundwater fluctuation decays exponentially with the distance to the beach,i.e.,,and our simulation further shows that the beach slope influence can be expressed in the form of a logarithm *** for the same location,the amplitude increases logarithmically with the beach angle in the form,where and are related with the horizontal distance（）in the form of a logarithm *** beach slope has no influence on the phase lag,although the latter increases regularly with the distance from the *** beach slope effect on the seawater intrusion is investigated through the quantitative relationship among the relative intrusion length（）,the relative enhancement of the tide induced seawater intrusion（）and the beach angle（）.It is shown that the tide effects on a milder beach is much greater than on a vertical one,and both λ and κ can be expressed in logarithm functions *** tidal effect on the flow field in the transition zone for a particular mild beach is also studied,with results showing that the tide induced fluctuation of is similar to the groundwater table fluctuation while shows a distinct variation along both directions.

关键词： tidal effects salt wedges saline intrusion beach slope finite element method

Experiments and modelling of phenanthrene biodegradation in the aqueous phase by a mixed culture

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Journal of Environmental Sciences 2006年第1期18卷 147-153页

作者： LIU Xiang mao xiao-min YANG Jian-gang D.A. Barry LI Ling Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Contaminated Land Assessment and Remediation Research Centre Institute for Infrastructure and Environment School of Engineering and Electronics The University of Edinburgh Edinburgh EH9 3JL United Kingdom Chinese Academy of Transportation Sciences Ministry of Communications Beijing 100029 China Environmental Engineering Division School of Engineering the University of Queensland St. Lucia QLD 4072 Australia Centre for Eco-Environmental Modelling Hohai University Nanjing 210098. China

Pollution by polycyclic aromatic hydrocarbons（PAHs） is widespread due to tmsuitable disposal of industrial waste. They are mostly defined as priority pollutants by environmental protection authorities worldwide. Phenanthrene, a typical PAH, was selected as the target in this paper. The PAH-degrading mixed culture, named ZM, was collected from a petroleum contaminated river bed. This culture was injected into phenanthrene solutions at different concentrations to quantify the biodegradation process. Results show near-complete removal of phenanthrene in three days of biodegradation if the initial phenanthrene concentration is low. When the initial concentration is high, the removal rate is increased but 20%-40% of the phenanthrene remains at the end of the experiment. The biomass shows a peak on the third day due to the combined effects of microbial growth and decay. Another peak is evident for cases with a high initial concentration, possibly due to production of an intermediate metabolite. The pH generally decreased during biodegradation because of the production of organic acid. Two phenomenological models were designed to simulate the phenanthrene biodegradation and biomass growth. A relatively simple model that does not consider the intermediate metabolite and its inhibition of phenanthrene biodegradation cannot fit the observed data. A modified Monod model that considered an intermediate metabolite （organic acid） and its inhibiting reversal effect reasonably depicts the experimental results.

关键词： biodegradation model phenanthrene microbial growth and decay Monod growth model

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潜水蒸发研究进展

水利水电科技进展 2010年第4期30卷 85-89,94页

作者：尚松浩毛晓敏清华大学水沙科学与水利水电工程国家重点实验室北京100084 中国农业大学水利与土木工程学院中国农业水问题研究中心北京100083

在有关研究成果的基础上,论述潜水蒸发的主要研究方法,归纳了裸地和植被生长条件下潜水蒸发的常用估算方法。指出未来应加强植被生长条件下潜水蒸发的试验观测,在水循环过程综合研究的基础上深入分析不同条件下的潜水蒸发规律。

关键词：潜水蒸发盐渍化防治地下水资源评价天然植被耗水综述

Impact of Burial Dissolution on the Development of Ultradeep Fault-controlled Carbonate Reservoirs:Insights from High-temperature and High-pressure Dissolution Kinetic Simulation

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Acta Geologica Sinica(English Edition) 2025年第1期99卷 228-242页

作者： TAN xiaolin ZENG Lianbo SHE min LI Hao mao Zhe SONG Yichen YAO Yingtao WANG Junpeng LU Yuzhen National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geoscience China University of Petroleum(Beijing)Beijing 102249China PetroChina Hangzhou Institute of Geology Hangzhou 310023China Shenzhen Branch of CNOOC(China)Co. Ltd.Shenzhen 518000China

Burial dissolution is a critical diagenetic process influencing ultra-deep carbonate reservoir development and *** carbonate samples with different internal structures were prepared,and high-temperature and highpressure dissolution kinetic simulations were *** results demonstrate that the intensity of burial dissolution is controlled by temperature and pressure,while tectonic-fluid activity influences the development pattern of burial dissolution,ultimately determining the direction of its differential *** burial dissolution is likely to occur primarily at relatively shallow depths,significantly influencing reservoir formation,preservation,modification,and *** development of faults facilitates the maintenance of the intensity of burial *** maximum intensity of burial dissolution occurs at the tips and overlap zones of faults and intersections of multiple *** larger the scale of the faults,the more conducive it is to the development of burial *** dissolution fosters the formation of fault networks characterized by enhanced reservoir capacity and *** dissolution controlled by episodic tectonic-fluid activity is a plausible explanation for forming the Tarim Basin's ultra-deep fault-controlled“stringbead-like”reservoirs.

关键词： burial dissolution tectonic-fluid ultra-deep carbonate reservoirs high-temperature and high-pressure dissolution kinetic simulation

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基于景观单元的黑河中游地下水位变化研究

灌溉排水学报 2014年第Z1期33卷 266-272页

作者：李江毛晓敏刘易中国农业大学水利与土木工程学院中国农业水问题研究中心

依据1∶10万土地利用数据将黑河中游划分为不同的景观单元,在此基础上分别对1986、2000、2005年景观单元变化以及相应地下水位降深进行时空相关分析。结果表明,1986—2005年,草地、非植被覆盖区、林地、水域的面积有所减少,居民用地、... 详细信息

依据1∶10万土地利用数据将黑河中游划分为不同的景观单元,在此基础上分别对1986、2000、2005年景观单元变化以及相应地下水位降深进行时空相关分析。结果表明,1986—2005年,草地、非植被覆盖区、林地、水域的面积有所减少,居民用地、农田面积相应增大。1986—2000年地下水下降深度小于2000—2005年(黑河实施分水后)。景观单元的变化是影响地下水位变化的重要原因。

关键词：黑河中游景观单元地下水

模拟北极航线多因素耦合条件下船用低合金钢的腐蚀行为

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表面技术 2022年第6期51卷 36-47页

作者：毛晓敏刘涛郭娜郭章伟董丽华上海海事大学上海201306

目的研究船舶低合金钢在模拟南海到北极的航行过程中的腐蚀情况,探索它在环境交变条件下的腐蚀行为与机理。方法选用3种温度(37、25、4℃)及相对应的典型海洋细菌,包括大西洋假交替单胞菌(Pseudoalteromonas atlantica)、需钠弧菌(Vibri... 详细信息

目的研究船舶低合金钢在模拟南海到北极的航行过程中的腐蚀情况,探索它在环境交变条件下的腐蚀行为与机理。方法选用3种温度(37、25、4℃)及相对应的典型海洋细菌,包括大西洋假交替单胞菌(Pseudoalteromonas atlantica)、需钠弧菌(Vibrio natriegens)和养料嗜冷杆菌(Psychrobacter cibarius),模拟航行往返过程中海洋环境的变化情况,以21 d为一个实验周期,每7 d改变一次温度和细菌种类,采用扫描电镜(SEM)、白光干涉、失重法和电化学测试方法从宏观和微观两方面对材料的腐蚀行为进行表征分析。同时,将相同的低合金钢试样浸泡在无菌海水中进行对照实验。结果浸泡在无菌海水中,当初始温度为37℃时,低合金钢的初始腐蚀速率较大;随着温度的降低和时间的延长腐蚀速率逐渐减小;当初始温度为4℃时,低合金钢的点蚀情况较严重,但腐蚀速率变化不大。浸泡在有菌海水中,初始温度为37℃时,低合金试样表面有大量方解石结构的碳酸钙镁盐沉积,从而较好地抑制了均匀腐蚀和点蚀的发生;当初始温度为4℃时,低合金钢试样表面点蚀严重,EDS能谱分析证明低合金钢试样在低温环境中没有明显的碳酸钙镁盐沉积。结论初始海水温度和细菌种类的不同会造成船用低合金钢腐蚀行为的极大差异,其原因主要是高温下细菌会诱导产生碳酸钙镁盐,并在低合金钢试样表面沉积,从而明显抑制了腐蚀;在低温环境下,细菌难以诱导碳酸钙镁盐的沉积,试样的均匀腐蚀和点蚀会非常严重,一旦发生腐蚀,即便后期再形成矿化产物膜也难以起到良好的防护作用。

关键词：微生物腐蚀低合金钢点蚀生物矿化环境交变

多组分离子交换吸附反应-运移的土柱试验及模拟

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水文地质工程地质 2010年第4期37卷 81-86页

作者：胡海珠毛晓敏王铄中国农业大学水利与土木工程学院/中国农业水问题研究中心北京100083

利用室内一维饱和垂直土柱对保守性溶质运移和反应性溶质运移分别进行了试验,并用水文地球化学模拟软件PHREEQC模拟了保守性溶质Cl-的运移以及K+、Ca2+、Na+、Mg2+4种主要阳离子的反应运移过程,分析了土壤中发生的离子交换吸附和盐分运... 详细信息

利用室内一维饱和垂直土柱对保守性溶质运移和反应性溶质运移分别进行了试验,并用水文地球化学模拟软件PHREEQC模拟了保守性溶质Cl-的运移以及K+、Ca2+、Na+、Mg2+4种主要阳离子的反应运移过程,分析了土壤中发生的离子交换吸附和盐分运移过程,进一步模拟分析了不同入流溶液种类、次序以及有无置换反应情况下出流溶液的差别。结果表明:这些条件的不同均会对出流溶液的种类和浓度产生明显影响,表明水文地球化学反应对地下水中污染物的迁移会产生很大影响,在相关领域的研究中不宜忽略。

关键词：多组分溶质反应运移饱和土柱数值模拟 PHREEQC

Effect of initial microstructure on microstructure evolution and mechanical properties of 0.12C martensitic steels during quenching and tempering

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Journal of Iron and Steel Research International 2025年第1期32卷 260-269页

作者： Ya-ru Wang Zi-yong Hou He Yang Jun Zhao Zhi-yuan Chang Fan-mao Meng Ling Zhang Gui-lin Wu xiao-xu Huang State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization Panzhihua 617000SichuanChina State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China International Joint Laboratory for Light Alloys(ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Institute of Steel Technology for Automobile and Household Appliance Pangang Group Co.Ltd.Panzhihua 617000SichuanChina ATB Motor(Shanghai)Co. Ltd.Keen International CenterShanghai 200041China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The microstructure evolution and mechanical properties of a Fe-0.12C-0.2Si-1.6Mn-0.3Cr-0.0025B(wt.%)steel with different initial microstructures,i.e.,hot rolled(HR)and cold rolled-annealed(CRA),were studied through optical microscopy,scanning electron microscopy,electron channeling contrast imaging,microhardness and room temperature uniaxial tensile *** water quenching from 930℃ to room temperature,a fully martensitic microstructure was obtained in both as-quenched HR and CRA specimens,which shows a microhardness of 480±5 HV,and no significant difference in microstructure and microhardness was *** test results show that the product of tensile strength and total elongation(UTS×TE)of the as-quenched HR specimen,i.e.,24.1 GPa%,is higher than that of the as-quenched CRA specimen,i.e.,18.9 GPa%.While,after being tempered at 300℃,the martensitic microstructures and mechanical properties of the two as-quenched specimens change significantly due to the synergy role of the matrix phase softening and the precipitation *** the maximum UTS×TE,it is 18.9 GPa%obtained in the as-quenched CRA one,while that is 24.4 GPa%obtained in the HR specimen after tempered at 300℃ for 5 min.

关键词： Initial microstructure Lath martensite Quenching Tempering Mechanical property

Enhanced rate capability and cycle stability of Ti2C MXene for sodium storage through an aniline molecules welding strategy

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Tungsten 2025年第1期7卷 161-171页

作者： Hao Chen Ya-Qin Wang Dong-Ting Zhang Bei Zhao min-Peng Li Chen-Yang Li Tian-Peng Xu mao-Cheng Liu State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology School of Computer and Communication Technology Lanzhou University of Technology

MXenes obtained significant attention in the field of energy storage devices due to their characteristic layered structure,modifiable surface functional groups,large electrochemically active surface,and regulable interlayer ***,the self-restacking and sluggish ions diffusion kinetics performance of MXenes during the alkali metal ions insertion/extraction process severely impedes their cycle stability and rate *** paper proposes an aniline molecule welding strategy for welding p-phenylenediamine（PPDA） into the interlayers of Ti2C through a dehydration condensation *** welded PPDA molecules can contribute pillar effect to the layered structure of *** pillar effect effectively maintains the structural stability during the sodium ions insertion/extraction process and effectively expands the interlayer spacing of Ti2C from 1.16 to 1.38 nm,thereby enhancing ions diffusion kinetics performance and improving the long-term cycle *** Ti2C-PPDA demonstrates outstanding Na+storage capability,exhibiting a specific capacity of 100.2 mAh·g-1at a current density of 0.1 A·g-1over 960 cycles and delivering a remarkable rate capability 81.2 mAh·g-1at a current density of 5 A·*** study demonstrates that expanding interlayer spacing is a promising strategy to enhance the Na+storage capacity and improve long-term cycling stability,which provides significant guidance for the design of two-dimensional Na+storage materials with high-rate capability and cycle stability.

关键词： Diffusion kinetics Expanding interlayer spacing Rate capability Sodium ions storage Ti2C