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A sensitivity study of the WRF model in offshore wind modeling over the Baltic Sea

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Geoscience Frontiers 2021年第6期12卷 209-222页

作者： Huidong Li Björn Claremar Lichuan Wu Christoffer Hallgren Heiner Körnich Stefan Ivanell Erik Sahlée Department of Earth Sciences Uppsala UniversityUppsala 75236Sweden Swedish Meteorological and Hydrological Institute Norrköping 60176Sweden

Accurate wind modeling is important for wind resources assessment and wind power forecasting. To improve the WRF model configuration for the offshore wind modeling over the Baltic Sea, this study performed a sensitivity study of the WRF model to multiple model configurations, including domain setup,grid resolution, sea surface temperature, land surface data, and atmosphere-wave coupling. The simulated offshore wind was evaluated against LiDAR observations under different wind directions, atmospheric stabilities, and sea status. Generally, the simulated wind profiles matched observations, despite systematic underestimations. Strengthening the forcing from the reanalysis data through reducing the number of nested domains played the largest role in improving wind modeling. Atmosphere-wave coupling further improved the simulated wind, especially under the growing and mature sea *** the vertical resolution, and updating the sea surface temperature and the land surface information only had a slight impact, mainly visible during very stable conditions. Increasing the horizontal resolution also only had a slight impact, most visible during unstable conditions. Our study can help to improve the wind resources assessment and wind power forecasting over the Baltic Sea.

关键词： Offshore wind modeling sensitivity study Atmosphere-wave coupling WRF Baltic Sea

Preliminary sensitivity study on an life cycle assessment(LCA)tool via assessing a hybrid timber building

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Journal of Bioresources and Bioproducts 2020年第2期5卷 108-113页

作者： Tiancheng Wu Meng Gong Jennifer Xiao Faculty of Forestry and Environmental Management University of New BrunswickFrederictonNB E3C2G6Canada Department of Biology Queen’s UniversityKingstonON K7L3N6Canada

In order to address concerns related to global warming and increased atmospheric carbon content,the life cycle assessment(LCA)tool has demonstrated usefulness in the building and construction *** LCA is used to evaluate environmental impacts concerning all stages of the building process from“cradle”to“grave”.The LCA helps promote sustainable development by considering environmental indicators such as stratospheric ozone depletion,eutrophication,global warming potential,and many *** is of an interest to know the degree of impact on a given environ-mental indicator if an input is changed in terms of the type or amount of the materials *** LCA software Athena IE4B was employed to analyze data of a selected timber *** study was aimed at evaluating the sensitivity of LCA analysis on a hybrid timber building,which was done via two case *** 1 focused on changes in the volume of wood materials,meanwhile Case 2 focused on simultaneous changes in the volume of materials for wood,steel,and *** Case 1,it was observed increasing wood materials increased environmental indicators,with stratospheric ozone depletion being the most sensitive and global warming potential as the least *** 2 discovered that proportionally increasing wood materials in relation to steel and concrete materials decreased environmental indicators,with eutrophication being the most sensitive and stratospheric ozone depletion as the least *** study helped support the feasibility of using Athena IE4B for LCA analysis in the initial assessment of a building.

关键词： Life cycle assessment Hybrid timber structure Environmental indicator sensitivity study

A sensitivity study of Single Column Model

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Advances in Atmospheric Sciences 1996年第3期13卷 313-324页

作者：董敏许秦 Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma / NOAA 100 E.BoydNormanOK.73019

A single column model (SCM) is constructed by extracting the physical subroutines from the NCAR Community Climate Model version 1 (CCM1).Simulated data are generated by CCM1 and used to validate the SCM and to study the sensitivity of the SCM to errors in its input *** is found that the SCM temperature predictions are moderately sensitive to errors in the input horizontal temperature flux convergence and moisture flux *** types of error are concerned in this study,random errors due to insufficient data resolution,and errors due to insufficient data area *** the first type of error can be reduced by filtering and/or increasing the data resolution,it is shown that the second type of error can be reduced by enlarging the data area coverage and using a suitable method to compute the input flux convergence terms.

关键词： Single column model,Input data errors sensitivity study

study of the CKM angleγsensitivity using flavor untagged B_(s)^(0)→D^(+)^(0)Ф decays

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Chinese Physics C 2021年第2期45卷 56-92页

作者：敖冬 D.Decamp 钱文斌 S.Ricciardi H.Sazak S.T’Jampens V.Tisserand 王子睿杨振伟张舒楠周晓康 University of Chinese Academy of Sciences Beijing 100049China UnivGrenoble Alpes UnivSavoie Mont BlancCNRSIN2P3-LAPPAnnecyFrance STFC Rutherford Appleton Laboratory DidcotUnited Kingdom UniversitéClermont Auvergne CNRS/IN2P3LPCClermont-FerrandFrance Center for High Energy Physics Tsinghua UniversityBeijing 100084China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing 100871China

A sensitivity study on the measurement of the CKM angle γ from B_(s)^(0)→D^(+)^(0)Ф decays is conducted us-ing the D-meson reconstructed in the quasi flavour-specific modes Kπ,K3π,and Kππ^(0),as well as CP-eigenstate modes KK and m,where the notation DO corresponds toa D0 or D0 *** LHCb experiment is presented as a use case.A statistical uncertainty of approximately 8°-19°can be achieved with the pp collision data collcted in the LHCb experiment from 2011 to *** sensitivity to r should be of the order 3°-8°after accumulating 23 fb^(-1) of pp collision data by 2025,whereas it is expected to improve further by 300 fb^(-1) by the second half of the 2030 *** accuracy is dependent on the strong parameters r and og,which together with ydescribe the interfer-ence between the leading ampliudes of the B_(s)^(0)→D^(+)^(0)Ф decays.

关键词： sensitivity study CKM angleyγ B_(s)^(0)→D^(+)^(0)Фdecays

Enhancing recovery and sensitivity studies in an unconventional tight gas condensate reservoir

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Petroleum Science 2018年第2期15卷 305-318页

作者： Min Wang Shengnan Chen Menglu Lin Chemical and Petroleum Engineering Department University of Calgary

The recovery factor from tight gas reservoirs is typically less than 15%, even with multistage hydrauhc tractunng stimulation. Such low recovery is exacerbated in tight gas condensate reservoirs, where the depletion of gas leaves the valuable condensate behind. In this paper, three enhanced gas recovery （EGR） methods including produced gas injection, CO2 injection and water injection are investigated to increase the well productivity for a tight gas condensate reservoir in the Montney Formation, Canada. The production performance of the three EGR methods is compared and their economic feasibility is evaluated. sensitivity analysis of the key factors such as primary production duration, bottom-hole pressures, and fracture conductivity is conducted and their effects on the well production performance are analyzed. Results show that, compared with the simple depletion method, both the cumulative gas and condensate production increase with fluids injected. Produced gas injection leads to both a higher gas and condensate production compared with those of the CO2 injection, while waterflooding suffers from injection difficulty and the corresponding low sweep efficiency. Meanwhile, the injection cost is lower for the produced gas injection due to the on-site available gas source and minimal transport costs, gaining more economic benefits than the other EGR methods.

关键词： Tight gas condensate reservoirs Enhanced/improved gas recovery Produced gas injection sensitivity study Economic benefit

有关雪盖模型内部及界面过程的参数化方案的敏感试验(英文)

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Advances in Atmospheric Sciences 2001年第5期18卷 910-928页

作者：孙菽芬李景阳 LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

In order to develop a seasonal snow model of land surface process as accurately as possible for climatic study. it is necessary to fully understand the effects of important snow internal processes and interaction with air and to get an insight into influence of several relevant parameterization schemes with parameters' uncertainty to some degree. Using the snow model (SAST) developed by first author and other one and some useful field observation data, this paper has conducted a series of sensitivity studies on the parameterization schemes. They are relative to compaction process, snow thermal conduction, methodology of layering snow pack and to key parameters such as snow albedo, water holding capacity. Then, based on the results from the sensitivity studies, some useful conclusions for snow cover model improvement are obtained from the analysis of the results.

关键词： snow cover model parameterization scheme and parameters sensitivity study SAST