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Evaluation and Quantitative Attribution Analysis of Water Yield Services in the Peak-cluster Depression Basins in Southwest of Guangxi,China

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Chinese Geographical Science 2023年第1期33卷 116-130页

作者： WANG Donghua TIAN Yichao ZHANG Yali HUANG Liangliang TAO Jin yang yongwei LIN Junliang ZHANG Qiang School of Resources and Environment Beibu Gulf UniversityQinzhou 535011China College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541004China Key Laboratory of Marine Geographic Information Resources Development and Utilization in the Beibu Gulf Beibu Gulf UniversityQinzhou 535011China

Karst environmental issues have become one of the hot spots in contemporary international geological research. The same problem of water shortage is one of the hot spots of global concern. The peak-cluster depression basins in southwest of Guangxi is an important water connotation and ecological barrier areas in the Pearl River Basin of China. Thus, studying the spatial and temporal variations and the influencing factors of its water yield services is critical to achieve the sustainable development of water resources and ecological environmental protection in this region. As such, this paper uses the Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST) model to assess the spatial and temporal variabilities of water yield services and its trends in the peak-cluster depression basins in southwest of Guangxi from 2000 to 2020. This work also integrates precipitation(Pre), reference evapotranspiration(ET), temperature(Tem), digital elevation model(DEM), slope, normalized difference vegetation index(NDVI), land use/land cover(LULC) and soil type to reveal the main factors that influence water yield services with the help of Geodetector. Results show that: 1) in time scale,the total annual water yield in the study area show a fluctuating and increasing trend from 2000 to 2020, with a growth rate of 7.3753 × 10^(8)m^(3)/yr, and its multi-year average water yield was 538.07 mm;2) in spatial pattern, with high yield areas mainly distributed in the south of the study area(mainly including Shangsi County, Pingxiang City, Ningming County, Longzhou County and Jingxi County), and low yield areas mainly distributed in Baise City and Nanning City;3) the dominant factor of water yield within karst and non-karst landforms is not necessarily controlled by precipitation, and the explanation degree of DEM factors in karst areas is significantly higher than that in non-karst areas;4) amongst the climatic factors, Pre, ET and Tem are dominant in the spatial pattern of region w

关键词： water yield Integrated Valuation of Ecosystem Services and Trade-offs(InVEST) Geodetector peak-cluster depression basins in southwest of Guangxi China

Optimizing write operation on replica in data grid

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Science China(Information Sciences) 2011年第1期54卷 1-11页

作者： XU PengZhi,WU yongwei,HUANG XiaoMeng, yang GuangWen & ZHENG WeiMin Department of Computer Science and Technology,Tsinghua University,Beijing 100084,China 1. Department of Computer Science and Technology Tsinghua University Beijing 100084 China

Replication technique can improve access performance and data availability of data grid systems. So far,most related work on data replication in data grid systems focuses on read-only *** write operations have been widely used in practice,its optimization problem has not been suciently *** this paper,we show that write requests from users can be processed by a nearest site,regardless of the location of latest written *** policy of write nearby instead of write to the latest replica can improve the performance of write operations,while inconsistency is caused between multiple ***,we propose two metadata management algorithms to make sure that users can retrieve up-to-date datasets at any *** extend OptorSim to support the implementation and evaluation of our *** results of simulation show that our scheme achieves performance gains up to 3.3 compared with WriteMaster scheme.

关键词： replication data grid simulation access latency

Development of LBE Spallation Target Thermohydraulics System Code

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IMP & HIRFL Annual Report 2018年第1期 203-204页

作者： Fan Deliang yang yongwei 不详

Nuclear energy is one of the most promising energy for the *** disposal of high-level radioactive nuclear waste is a big *** nuclear waste problem has restricted the sustainable development of nuclear *** Driven Systems(ADS)was considered to have a very good potential for safely and efficiently burn *** spallation target is one of the potential candidate of the ADS(Accelerator Driven Sub-critical System).The thermohydraulics character of LBE is much different from the traditional reactor coolant,such as water and *** we need to develop the LBE technology.

关键词： problem. energy. potential

Flow Induced Vibration Theory & Analysis about the Key Structures in Nuclear Reactor

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IMP & HIRFL Annual Report 2018年第1期 202-203页

作者： Shu Yafeng yang yongwei 不详

In reactor,FIV study is still a hot topic ***,many experts keep a viewpoint of the combination between theorum model and semi-emprical equation for the FIV mechanism *** papers,including monographys about FIV study,already appeared.A preliminary idea is that FIV mechanism is divided into turbulent excitation,vortex shedding,fluidelastic instability and acousitc reasonance,etc.[1−4].According to the flow form of fluid in reactor,the vibration mechanism can be thought vibration induced by transverse flow,axial flow,leakage *** previous reactors designed in home and abroad,there have been many accidents caused by *** Unversity have reviewed the FIV mechanism in detail[5;6],who are from China Nuclear Power Institute,sumerized FIV problem in nuclear power plant,including conveying flow pipe FIV and numerical simulation *** work mainly study FIV phenomena and method,but little attetion to FIV effect and experiment measurement techniques.

关键词： method. flow. turbulent

Couple3.0 Program Application in Search for ADS Design Scheme

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IMP & HIRFL Annual Report 2017年第1期 199-200页

作者： Meng Haiyan yang yongwei 不详

At present,there are few programs that can be used directly for ADS sub-critical core design and burnup problem mainly because most programs cannot simultaneously calculate proton spallation processes and transport problems of high-energy *** we use the COUPLE3.0 to accomplish all the calculation task in this *** COUPLE3.0 program is a three-dimensional transport-burnup simulation program developed by Institute of Modern Physics,Chinese Academy of *** transport calculation part of COUPLE3.0 program is Monte Carlo code MCNPX2.7 and the burnup calculation is performed by *** of COUPLE3.0 program has been verified by a lot of *** COUPLE3.0 program has four function modules:neutron irradiation burnup calculation,proton irradiation calculation,critical calculation and the data post-processing *** these function modules,COUPLE3.0 program can solve the neutron problem of ADS system.

关键词： critical calculation verified

Flow Induced Vibration Theory & Analysis and Fuel Rod Cumulative Damage Function

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IMP & HIRFL Annual Report 2017年第1期 198-199页

作者： Shu Yafeng yang yongwei 不详

Brief description of research in nuclear engineering,the safety of reactor design is very *** structure inside the reactor and coolant constitute a complex fluid solid coupling system,so the flow induced vibration(FIV)is *** this paper,the specific influence of FIV,such as vibration amplitude,frequency,structural stablity,nonlinear dynamic characteristics,etc,and analysis and computational method for the influence of structural vibration damage are studied and *** the end,two methods of measuring the FIV and some strategies for vibration suppression design in the future development are summed *** cladding of fuel rod is regard as the first safety barrier in nuclear reactor,and it is important to do its life analysis and calculation.

关键词： calculation. Vibration coupling

Source Analysis of the Lead-bismuth Spallation Target

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IMP & HIRFL Annual Report 2018年第1期 204-205页

作者： Meng Haiyan yang yongwei 不详

The purpose of the source analysis of the lead-bismuth spallation target is mainly to compare the differences of parameters with the different sources in the lead-bismuth spallation *** calculations are accomplished u... 详细信息

关键词： bismuth accomplished calculations

Preliminary Conceptual Design of 50 MW LBE Cooled Small Modular Fast Reactor

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IMP & HIRFL Annual Report 2017年第1期 194-195页

作者： Gao Yucui yang yongwei 不详

Small and medium-sized modular reactors normally are reactors whose power usually less than 300 MW,also,the primary circuit loop such as core,heat exchanger,pump are integrated in the pressure vessel,due to its integration and lower power,the small modular reactor could under the standardized assembly line production and then transported to the destination,in addition,because of the lower power and characteristic of LBE,the LBE cooled small fast reactor could realize natural circulation and then have inherent ***,the small fast reactor could get flexible application such as centralized heating,water desalination and power supply for remote area and marine or space *** view of those,small and medium-sized modular reactors have been a hot area of research these years.

关键词： Small sized power

Simulation Analysis of Neutron Time-space Kinetics for Venus-Ⅱ Lead Cold Zero Power Reactor Based on IQS/MC program

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IMP & HIRFL Annual Report 2017年第1期 200-201页

作者： Gao Qingyu Zhao Zelong yang yongwei 不详

Accelerator driven sub-critical system is driven by an external neutron source which are generated by spallation reaction and maintains the stable operation of sub-critical core,while the external neutron source increases the complexity of reactor neutron kinetics *** simulation of neutron space-time kinetics for the spallation neutron source coupled with sub-critical core is of significance on the research of dynamics process and transient simulation ***/MC is a program for simulation analysis of neutron time-space kinetics utilizing improved quasi-static approximation combined with Monte Carlo neutron transport code.A GUI-based control platform on MATLAB solving amplitude function and shape functions can achieves the dynamics simulation *** work achieves the simulation of source change and safety rod dropping transient process of lead cooled zeropower experimental reactor by IQS/MC program.

关键词： process. kinetics critical