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Attribution analysis of groundwater level fluctuation in the Xinxiang section of the Lower Yellow River's suspended river after the construction of the Xiaolangdi Reservoir

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Journal of Geographical Sciences 2024年第7期34卷 1348-1370页

作者： LI He PING Jianhua leng wei MEI Xuemei ZHANG Min LIU Jiaqi School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou450001China College of Ecology and Environment Zhengzhou UniversityZhengzhou450001China Geothermal and Ecological Geology Research Center Zhengzhou UniversityZhengzhou450001China Institute of Geology and Geophysics CASBeijing100101China

The clear identification and quantification of the factors affecting groundwater systems is crucial for protecting groundwater resources and ensuring safety in agricultural *** Lower Yellow River(LYR)is a suspended river that replenishes groundwater continuously due to clear differences in the water head,especially in the Xinxiang *** its construction,the Xiaolangdi Reservoir has reversed the LYR’s *** accurately determine the factors influencing the groundwater level(GWL),the study area was divided into five subzones based on hydrogeology.A dynamic factor model(DFM),variational mode decomposition(VMD),and a multiple linear regression model were used to identify and quantify the factors influencing the *** impact of the suspended river on the groundwater before and after the construction of the Xiaolangdi Reservoir was *** results show that:(1)The rate of decrease in the GWL was 8.53×10^(–4)m/month,and the rate of decrease in the Yellow River water level(RWL)was 4.63×10^(–4)m/month.(2)Mountain front recharge(MFR)(scale=3 months)and precipitation(scale=9 months)were the dominant factors in subzones I and II,accounting for more than 40%of the fluctuation in the *** III was dominated by exploitation(scale=7 months)and precipitation(scale=12months),accounting for 28.43%,and 23.44%of changes in the GWL,*** subzone IV,agricultural irrigation(scale=12 months)was the major factor,accounting for32.47%of GWL changes,while in subzone V,the RWL(scale=12 months)accounted for52.52%of these changes.(3)The Xiaolangdi Reservoir has increased the lateral seepage of the suspended river and altered the inter-annual *** results of this study can provide a valuable reference for controlling groundwater overexploitation and ensuring water supply security.

关键词： groundwater level influencing factor dynamic factor analysis Xiaolangdi Reservoir Lower Yellow River lateral seepage of the Yellow River

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Discovery of a geomorphological analog to Martian araneiforms in the Qaidam Basin, Tibetan Plateau

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中国科学技术大学学报 2024年第5期54卷 1-9,I0006页

作者： Shengxing Zhang Yiliang Li wei leng Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Department of Earth Sciences The University of Hong KongHong Kong 999077China CAS Center for Excellence in Comparative Planetology Hefei 230026China

Araneiforms are spider-like ground patterns that are widespread in the southern polar regions of Mars.A gas erosion process driven by the seasonal sublimation of CO_(2) ice was proposed as an explanation for their formation,which cannot occur on Earth due to the high climatic *** this study,we propose an alternative mechanism that attrib-utes the araneiform formation to the erosion of upwelling salt water from the subsurface,relying on the identification of the first terrestrial analog found in a playa of the Qaidam Basin on the northern Tibetan *** analysis indicates that the structures in the Qaidam Basin have fractal features comparable to araneiforms on Mars.A numerical model is developed to investigate the araneiform formation driven by the water-diffusion *** simulation res-ults indicate that the water-diffusion process,under varying ground conditions,may be responsible for the diverse aranei-form morphologies observed on both Earth and *** numerical simulations also demonstrate that the orientations of the saltwater diffusion networks are controlled by pre-existing polygonal cracks,which is consistent with observations of araneiforms on Mars and *** study thus suggests that a saltwater-related origin of the araneiform is possible and has significant implications for water searches on Mars.

关键词： araneiform landform subsurface water Qaidam Basin Mars analog fractal simulations

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Progress in numerical modeling of subducting plate dynamics

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Science China Earth Sciences 2018年第12期61卷 1761-1774页

作者： wei leng Liangzhi HUANG School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China National Geophysical Observatory at Mengcheng Hefei 230026China

The core concerns of plate tectonics theory are the dynamics of subducting plates, which can be studied by integrating multidisciplinary fields such as seismology, mineral physics, rock geochemistry, geological formation studies, sedimentology,and numerical simulations. By establishing a theoretical model and solving it with numerical methods, one can replicate the dynamic effects of a subducting plate, quantifying its evolution and the surface response. Simulations can also explain the observations and experimental results of other disciplines. Therefore, numerical models are among the most important tools for studying the dynamics of subducting plates. This paper provides a review on recent advances in the numerical modeling of subducting plate dynamics. It covers various aspects, namely, the origin of plate tectonics, the initiation process and thermal structure of subducting slab, and the main subduction slab dynamics in the upper mantle, mantle transition zone, and lower mantle. The results of numerical models are based on the theoretical equations of mass, momentum, and energy conservation. To better understand the dynamic progress of subducting plates, the simulation results must be verified in comparisons with the results from natural observations by geology, geophysics and geochemistry. With the substantial increase in computing power and continuous improvement of simulation methods, numerical models will become a more accurate and efficient means of studying the frontier issues of Earth sciences, including subducting plate dynamics.

关键词： Subducting plate Dynamics Numerical simulation

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Progress in the numerical modeling of mantle plumes

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Science China Earth Sciences 2023年第4期66卷 685-702页

作者： wei leng Hao LIU Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China State Key Laboratory of Geological Processes and Mineral Resources School of Geophysics and GeomaticsChina University of GeosciencesWuhan 430074China CAS Center for Excellence in Comparative Planetology Hefei 230026China

The mantle plume model, as an integral part of the Earth’s internal convection system, is complementary to the theory of plate tectonics. They together constitute the key configuration of material circulation and energy transport in the Earth’s interior. Seismology, high-temperature and high-pressure mineralogy, geology, and geodynamic numerical modeling have conducted comprehensive studies on the mantle plume model since it was proposed. In particular, numerical simulation, which investigates the dynamic processes of mantle plumes by establishing a theoretical model, provides a quantitative description of possible mantle plume evolution and the responses of the Earth’s interior and surface, which can be used to explain observations and experimental results from other disciplines. Thus, it is one of the most important means to study plume dynamics. This paper summarizes the research progress in numerical modeling of mantle plumes in past decades, including the origin of mantle plumes, seismological evidence for the existence of plumes, interactions between mantle plumes and the lithosphere, mid-ocean ridges, subduction zones, and the mantle transition zone, as well as the relationship between plumes and large low shear wave velocity provinces. The theoretical results of numerical modeling combined with observations from other disciplines enable us to deeply understand the dynamic process of mantle plumes. With the continuing development of numerical methodology and the improvement of high-performance computing, geodynamic numerical modeling will become a more accurate and efficient approach for studying mantle plume dynamics and related frontier problems in geosciences.

关键词： Mantle plume Dynamics Numerical modeling

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Aseismic ridge subduction and flat subduction:Insights from three-dimensional numerical models

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Earth and Planetary Physics 2023年第2期7卷 269-281页

作者： Hui Zhao wei leng Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China

Flat subduction can significantly influence the distribution of volcanism,stress state,and surface topography of the overriding ***,the mechanisms for inducing flat subduction remain *** two-dimensional(2-D)numerical models and laboratory analogue models suggested that a buoyant impactor(aseismic ridge,oceanic plateau,or the like)may induce flat ***,three-dimensional(3-D)systematic studies on the relationship between flat subduction and buoyant blocks are still ***,we use a 3-D numerical model to investigate the influence of the aseismic ridge,especially its width(which is difficult to consider in 2-D numerical models),on the formation of flat *** model results suggest that the aseismic ridge needs to be wide and thick enough to induce flat subduction,a condition that is difficult to satisfy on the *** also find that the subduction of an aseismic ridge parallel to the trench or a double aseismic ridge normal to the trench has a similar effect on super-wide aseismic ridge subduction in terms of causing flat subduction,which can explain the flat subduction observed beneath regions such as Chile and Peru.

关键词： flat subduction aseismic ridge oceanic plateau 3-D numerical simulation

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Thermal structure of continental subduction zone: high temperature caused by the removal of the preceding oceanic slab

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Earth and Planetary Physics 2021年第3期5卷 290-295页

作者： Ting Luo wei leng Laboratory of Seismology and Physics of Earth’s Interior/School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Beijing 100049China

The thermal structure of the continental subduction zone can be deduced from high-pressure and ultra-high-pressure rock samples or numerical ***,petrological data indicate that the temperature of subducted continental plates is generally higher than that derived from numerical *** this paper,a two-dimensional kinematic model is used to study the thermal structure of continental subduction zones,with or without a preceding oceanic *** results show that the removal of the preceding oceanic slab can effectively increase the slab surface temperature of the continental subduction zone in the early stage of *** can sufficiently explain the difference between the cold thermal structure obtained from previous modeling results and the hot thermal structure obtained from rock sample data.

关键词： thermal structure continental subduction zone slab breakoff numerical model

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枳实消痞颗粒对脾虚气滞型腹膜透析患者营养不良及蛋白结合毒素的影响

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现代中西医结合杂志 2024年第3期33卷 347-351,410页

作者：惠燕妮白亚宁冷伟陕西中医药大学陕西咸阳712046 陕西中医药大学附属医院陕西咸阳712000

目的观察枳实消痞颗粒对脾虚气滞型腹膜透析患者营养不良及蛋白结合毒素的影响。方法选取2021年10月—2022年10月在陕西中医药大学附属医院肾病二科及门诊随访的维持性腹膜透析营养不良患者60例,将其随机对照原则分为对照组和治疗组各3... 详细信息

目的观察枳实消痞颗粒对脾虚气滞型腹膜透析患者营养不良及蛋白结合毒素的影响。方法选取2021年10月—2022年10月在陕西中医药大学附属医院肾病二科及门诊随访的维持性腹膜透析营养不良患者60例,将其随机对照原则分为对照组和治疗组各30例。对照组采用西医基础治疗,治疗组在对照组治疗基础上服用枳实消痞颗粒,治疗3个月后观察肾功能指标及透析充分性指标[血肌酐(SCr)、尿素氮(BUN)、尿素清除指数(Kt)]、营养状态指标[血红蛋白(Hb)、血清白蛋白(ALB)、血清前白蛋白(PA)、体质指数(BMI)、肱三头肌皮褶厚度(TSF)、上臂围(AC)、上臂肌围(AMC)]、蛋白结合毒素指标[血清和腹透液中硫酸吲哚酚(IS)、硫酸对甲酚(pCS)水平]、中医证候积分、改良主观综合性营养评估表(MQSGA)评分的变化。结果治疗3个月后,治疗组SCr水平、BUN水平、血清和腹透液中IS水平、血清pCS水平及中医证候积分、MQSGA评分均较治疗前明显降低(P均0.05);对照组仅SCr水平明显降低(P<0.05);治疗后治疗组ALB、PA水平均明显高于对照组(P均<0.05),血清pCS水平及中医证候积分均明显低于对照组(P均<0.05)。结论枳实消痞颗粒能够改善脾虚气滞型腹膜透析患者的营养状态,降低血清及腹透液中IS水平和血清中pCS水平,具有保护肾脏和腹膜作用。

关键词：枳实消痞颗粒腹膜透析营养不良蛋白结合毒素

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某超高层建筑屋顶信号塔施工方法

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建筑技术 2024年第17期55卷 2126-2128页

作者：赵伟平陈浩冷洪伟中建二局第三建筑工程有限公司北京100070

抚州市某项目传媒中心主楼屋顶158.5 m处设置有高为55 m高电视信号塔,采用“中央悬浮抱杆吊装”的施工工艺。中央悬浮抱杆通过承托绳、内拉线固定在已安装的塔身上;中央悬浮抱杆安装后,抱杆顶点(即吊装支点)远高于工作面,可将构件直接... 详细信息

抚州市某项目传媒中心主楼屋顶158.5 m处设置有高为55 m高电视信号塔,采用“中央悬浮抱杆吊装”的施工工艺。中央悬浮抱杆通过承托绳、内拉线固定在已安装的塔身上;中央悬浮抱杆安装后,抱杆顶点(即吊装支点)远高于工作面,可将构件直接吊装至工作面。在塔式起重机、起重机等大型设备吊装施工成本过高的情况下采用中央悬浮抱杆吊装技术,其安装成本低、安全性高、节约工期,可供类似项目借鉴。

关键词：信号塔中央悬浮抱杆吊装承托绳

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Analytical and numerical simulations of uplift processes at the Tibet-Sichuan boundary

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Earthquake Science 2017年第3期30卷 135-143页

作者： Diandian Peng wei leng Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of China

Previous studies have shown that the uplift of Tibetan plateau started in response to the collision of Indian plate and Eurasian plate. During this process, the crust of Tibetan plateau has been greatly thickened which leads to significant elevations. The elevation gradient is extremely large at the east boundary of Tibetan plateau where Longmenshan fault exists, dropping from 4500 to 500 m within a distance of 100 km, while it is more gentle at the south and north sides of Sichuan basin. Such a difference of elevation gradient has been explained with a crustal channel flow model. However, pre- vious crustal flow models consider the thickness of the lower crust as a constant which is highly simplified. Therefore, it is essential to build a more realistic crustal flow model, in which the thickness of the lower crust is variable and dependent on the inflow velocity of crustal materials. Here we build up both analytical and numerical models to study the mechanism and process of the uplift of Tibetan plateau at the eastern boundary. The results of the analytical model show that if the thickness of the lower crust can vary during the uplift process, the lower crustal viscosity of the Sichuan basin needs to be 1022 Pas to fit the observed elevation gradient. Such a viscosity is one-order magnitude larger than the previous results. Numerical model results further show that the state of stresses at the plateau boundary changes during uplift processes. Such a stress state change may cause the formation of different fault types in the Longmenshan fault area during its uplift history.

关键词： Tibetan plateau Sichuan basin Channelflow Geodynamic modeling

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经方治疗腹膜透析并发症的研究进展

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中国医药导报 2024年第7期21卷 57-60页

作者：刘鹏冷伟刘春莹陕西中医药大学附属医院陕西咸阳712046

腹膜透析作为终末期肾病的常用替代疗法,其并发症影响患者的生活质量和治疗效果。西药多以对症处理为主,效果参差不齐。中医药,特别是经方,在改善腹膜透析并发症的临床症状、减轻炎症反应等方面有着难以替代的优势。本文总结近年来经方... 详细信息

腹膜透析作为终末期肾病的常用替代疗法,其并发症影响患者的生活质量和治疗效果。西药多以对症处理为主,效果参差不齐。中医药,特别是经方,在改善腹膜透析并发症的临床症状、减轻炎症反应等方面有着难以替代的优势。本文总结近年来经方在防治营养不良、腹膜炎、呼吸道感染、便秘、水肿、不良情绪等常见腹膜透析并发症中的研究进展,以期进一步提高临床中医药治疗腹膜透析并发症的效果,延长其应用时间,降低透析失败率。

关键词：腹膜透析并发症经方研究进展

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