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1.
In order to investigate the wind characteristics of coastal areas of China, a long-term field measurement of natural wind
was carried out. Based on the field measurement results, this paper presents the natural wind characteristics of typhoons
and strong monsoons at the site of Xi-hou-men Bridge, including mean wind speed, mean wind direction, mean wind elevation
angle, turbulent intensity, gust factor, turbulence integral length scales, power spectrum of wind speed and spatial correlation
of gusty wind, the profiles of mean wind speed and turbulent intensity, etc. The correlation among wind characteristics is
analyzed in detail, and the similarities and differences of wind characteristics between typhoons and monsoons are analyzed.
These results can provide detailed wind characteristics of coastal areas of China. 相似文献
2.
The aim of this study was to perform computational fluid dynamics (CFD) simulations on the airflows at the Hong Kong International Airport (HKIA). In particular, the effects of hangar buildings and terrain were studied to explore the effects of turbulence on flying aircraft, especially during landing. The CFD simulation showed that significant differences in wind speeds may occur between the north and the south runways on the western part of the HKIA under typhoon conditions with a strong north to northwesterly wind. Simulation also showed that the hanger buildings between the two runways on the western side and the nearby terrain could be causing the observed difference in the wind speeds. The results also indicated that these obstacles could cause significant wind speed variations at the western end of the south runway. This may affect the operation of landing aircraft. The CFD results for a typical typhoon case were analyzed and found to match the wind data recorded by an aircraft landing that day. 相似文献
3.
农用地适宜性评价是土地利用规划的重要环节.目前,国内对农用地适宜性评价进行了广泛而深入的研究,评价范围区域性特征明显、评价指标综合化与多样化;农用地适宜性评价技术方法不断更新,模型化趋势明显;GIS技术与数学方法、模型结合,保证了农用地适宜性评价的准确性、科学性.随着景观生态学理论的引入,农用地生态适宜性评价将进一步得到重视,研究理论与方法的更新是关键点. 相似文献
4.
以1km ×1km栅格为基本单元,选取交通路网指数、水域指数、学校服务指数、居住影响力指数与地被指数等影响因子,运用GIS技术建立大滁城人居环境指数（HEI）模型,定量研究大滁城规划区人居环境的适宜程度及其空间规律性。研究结果表明：大滁城人居环境指数呈现由中心区域向周边地区递减的趋势;人居环境指数与人口密度有着较好的相关性,二者的一次拟合度 R2＝0．8361。大滁城人居环境适宜性评价结果显示,大滁城一般适宜以上的地区132km2,接近大滁城面积的2．96％,相应的人口占大滁城8．75％,其中3．3％的人口聚集在0．78％人居环境高度适宜和比较适宜地区;大滁城人居环境临界适宜地区698km2,占大滁城国土面积的15．69％,相应的人口39．33万,占大滁城总人口的24．21％,人口密度555人/km2,是大滁城人居环境适宜与否的过渡地区;大滁城人居环境不适宜地区3619km2,人口108．91万,占大滁城总面积的81．35％,人口密度为303人/km2,低于大滁城地区365人/km2的平均水平。 相似文献
5.
根据自然灾害系统理论,结合相关气象、水文、灾情资料,从致灾因子、灾情以及减灾预案等方面对2005年10月2日登陆福建晋江和龙海的“龙王”台风灾害链巨灾进行分析.结果表明:城市地区主要致灾因子是狂风、内涝、积水等,而农村和郊区地区则主要是狂风、洪水、山洪暴发、滑坡、泥石流等;造成巨灾的原因是登陆台风“龙王”引起的灾害链、福建中西部多山地和丘陵、山地性河流(比降大)等自然因素和防洪工程落后、灾害预警机制不够完善、人们防灾意识不够强、灾害风险转移机制不够成熟等人为因素共同造成的.根据巨灾区域差异和成因分析,提出城市地区和平原低地应重点防御内涝,沿海以防御大风和风暴潮为主,山区则应重点防御山洪暴发、滑坡、泥石流等地质灾害为主的对策. 相似文献
6.
Characteristics of strong winds at the Runyang Suspension Bridge based on field tests from 2005 to 2008 总被引：1，自引：0，他引：1
Field measurement of strong wind characteristics is of great significance for the development of bridge wind engineering. Located in east China, the Runyang Suspension Bridge （RSB） with a main span of 1490 m is the longest bridge in China and the third longest in the world. During the last four years, the RSB has suffered from typhoons and strong northern winds on more than ten occasions. To determine the strong wind characteristics of the RSB, wind measurement data obtained from field tests during strong winds and data from the wind environment monitoring subsystem of the structural health monitoring system （SHMS） of the RSB were combined to analyze the wind speed and direction, variation in wind speed with height, turbulence intensity, turbulence integral length, wind friction speed and the power spectrum. Comparative studies on the characteristics of these different strong winds were carried out based on the current wind-resistant design specification for highway bridges. Results showed that some regularity in wind characteristics can be found in these different typhoons passing through the RSB. The difference between a strong northern wind and a typhoon is relatively clear, and in summer the typhoon is the dominant wind load acting on the RSB. In addition, there were some differences between the measured strong wind characteristics and the values suggested by the specification, especially in respect to turbulence intensity and turbulence integral length. Results provide measurement data for establishing a strong wind characteristic database for the RSB and for determining the strong wind characteristic parameter values of this coastal area in east China. 相似文献
7.
根据自然灾害系统理论,结合相关气象、水文、灾情资料,从致灾因子、灾情以及减灾预案等方面对2005年10月2日登陆福建晋江和龙海的“龙王”台风灾害链巨灾进行分析.结果表明:城市地区主要致灾因子是狂风、内涝、积水等,而农村和郊区地区则主要是狂风、洪水、山洪暴发、滑坡、泥石流等;造成巨灾的原因是登陆台风“龙王”引起的灾害链、福建中西部多山地和丘陵、山地性河流(比降大)等自然因素和防洪工程落后、灾害预警机制不够完善、人们防灾意识不够强、灾害风险转移机制不够成熟等人为因素共同造成的.根据巨灾区域差异和成因分析,提出城市地区和平原低地应重点防御内涝,沿海以防御大风和风暴潮为主,山区则应重点防御山洪暴发、滑坡、泥石流等地质灾害为主的对策. 相似文献
8.
Residential environment index system and evaluation model established by subjective and objective methods 总被引：1，自引：0，他引：1
In this research, the residential environment index system and evaluation model were established by means of subjective and objective methods. The methodology for establishing the evaluation system for residential environment was first analyzed; then the subjective evaluation data-base was established by questionnaire survey; and at the same time, the objective evaluation data-base was constructed by Geographic Information System (GIS); and then the related equation system between subjective and objective system was developed by multiple regression analysis. This research could benefit evaluation of the residential environment quality for various purposes, and also provide important rudimentary data-base for the development and improvement of residential environment for officials. Furthermore, the index system and evaluation model established in this research could construct a strong relation between subjective evaluation and objective data; and thus could provide a comprehensive, efficient and effectiv 相似文献
9.
Residential environment index system and evaluation model established by subjective and objective methods 总被引：1，自引：0，他引：1
葛坚 《浙江大学学报(A卷英文版)》2004,5(9):1028-1034
In this research, the residential environment index system and evaluation model were established by means of subjective and objective methods. The methodology for establishing the evaluation system for residential environment was first analyzed; then the subjective evaluation data-base was established by questionnaire survey; and at the same time, the objective evaluation data-base was constructed by Geographic Information System (GIS); and then the related equation system between subjective and objective system was developed by multiple regression analysis. This research could benefit evaluation of the residential environment quality for various purposes, and also provide important rudimentary data-base for the development and improvement of residential environment for officials. Furthermore, the index system and evaluation model established in this research could construct a strong relation between subjective evaluation and objective data; and thus could provide a comprehensive, efficient and effective methodology for the evaluation of residential environment. 相似文献
10.
张玲 《廊坊师范学院学报(自然科学版)》2014,(3):46-48
风电场微观选址时需要对风电场的地形、风力特性等因素进行综合考虑,正确选择风力数据的测量仪器,掌握测风塔的安装方法以及风电场的数据处理流程. 相似文献
11.
中国某传统民居选址对自然通风的影响(英文) 总被引：1，自引：0，他引：1
利用计算流体动力学模拟了传统民居当大门建筑群丘陵地形下选址与自然通风的关系.该模拟包括不同气候与地形下的4个案例及其建筑周边风压与风速分布.模拟结果显示:山体能够降低建筑迎风面和背风面的风压绝对值;在有山体的地形中天井对自然通风的促进效果大于没有山体的地形,对比冬季与夏季天井效果时也可得到同样结论;作为障碍物,山体还能降低建筑周边的风速,且由于冬夏季风向不同,山体的影响程度呈现出较大区别.分析结果表明,丘陵位于建筑北向的选址方式可以解决亚热带气候条件下住宅冬夏2季不同的自然通风需求而造成的矛盾,尤其在含天井的住宅中最为显著. 相似文献
12.
Rachel Forrester‐Jones Eleni Hatzidimitriadou 《Assessment & Evaluation in Higher Education》2006,31(6):611-624
The aim of this research was to explore why workers in health and social services embarked on a Certificate in Community Care Practice and the extent to which they felt knowledge learnt related to their every‐day work practice. The objective was to indicate how useful more academic courses are for health and social care staff, and to find out the kinds of barriers to practicing theory learnt in the classroom students face in their ‘real world’ of work. Data was collected from 25 mature students (over half were between the ages of 41–50 years), 3 of whom were men from a range of professional backgrounds including; support staff working in residential and domiciliary services and informal (unpaid) carers for people with learning disabilities, mental health difficulties as well as older people. Quantitative (an adapted questionnaire) and qualitative (focus group session which was an integral part of classroom learning about research methodology) methods were employed. Data was analysed using SPSS and thematic analysis. Findings indicated that the main motivators for study was to gain a qualification and for personal development. Students reported their increased desire to link theory learnt which they found highly relevant to their everyday practice, but organisational barriers sometimes precluded them from doing so. The paper ends with policy and practice recommendations. 相似文献
13.
陈兵丽 《黄冈师范学院学报》2013,33(3):69-73
以池州市为例,构建了旅游城市建设用地适宜性评价的指标体系和综合评价模型,并利用层次分析法确定各因子的权重,以减少主观因素的影响。研究结果表明评价方法合理有效,针对性和实用性较强。 相似文献
14.
滕敏 《连云港职业技术学院学报》2006,19(3):13-15
地形实时绘制和交互式可视化是虚拟现实、地理信息系统、计算机图形学、科学计算可视化等技术的关键问题。本文对地表模型的实时生成和简化方法进行了研究和分析,提出了基于自适应四叉树视相关多分辨率地形生成方法。 相似文献
15.
鲁东南地区新石器遗址的时空分布特征 总被引：1，自引：0，他引：1
文化遗址是文化遗产的有机组成部分,文化的发生、演进、发展、传承甚至毁灭都是在古遗址上发生的。文化遗址的研究涉及多个方面,其中遗址空间分布研究是一个重要方面。本文采用GIS空间分析方法．对鲁东南地区新石器文化遗址的空间分布特征进行了分析研究。从遗址分布的自然地形方面进行分析．发现在不同时期内遗址的高程、坡向有一定的分布特征,古遗址在某些地区分布具有一定的聚集性。 相似文献
16.
本文选取与土壤肥力密切相关的7个因素,建立综合评价指标体系,运用GIS和SPSS技术,对许昌市主要农业土壤肥力进行综合评价.针对评价结果,提出土壤合理利用的建议. 相似文献
17.
Using FEM to predict tree motion in a wind field 总被引：1，自引：0，他引：1
In this paper we propose a finite element （FE） simulation method to predict tree motion in a wind field, Two FE tree models were investigated： One model was generated based on a realistic nature-looking geometric tree model, and the other was a symmetric model to investigate the influence of asymmetric material properties on tree motion. The vortex-induced vibration （VIV） theory is introduced to estimate the fluctuating wind force being exerted on tree stems and the fluid-structure interaction （FSI） analysis is also included in the simulation. The results indicate that asymmetric material properties result in the crosswind displacement of the investigated node and the main swaying direction deviation. The simulation reveals that under wind loading, a tree with leaves has much larger swaying amplitude along the wind direction and longer swaying period than a tree without leaves. However, the crosswind swaying amplitude is mainly due to branch interaction. The numerical simulation proved that the interaction of tree branches can prevent dangerous swaying motion developing. 相似文献
18.
The Behavior Problem Checklist (Quay & Peterson, 1979) was completed by classroom teachers for 104 children and youth (64 boys and 40 girls) at a state residential school for the blind to determine the prevalence of problem behavior. Results were compared to earlier studies of behavior problems of nonhandicapped children and of two groups of hearing-impaired children, one living at home and attending a community program and a second group attending a state residential school. Results were more similar to those obtained with the hearing-impaired children in the residential setting than to either the nonhandicapped or the hearing-impaired living at home. Comparisons by sex failed to find statistically significant differences. 相似文献
19.
Knudson BG 《American annals of the deaf》2003,148(1):49-55
Data on selected characteristics of superintendents of American residential schools for the Deaf were gathered in a 1999 survey. The resulting profile of superintendents of residential schools was then compared with a profile of superintendents of public elementary and secondary schools that had been compiled in 1992 by the American Association of School Administrators. The study population consisted of the lead administrators of the 72 residential schools for the Deaf in operation in the United States at the time of the survey. One particularly note-worthy finding was that these superintendents reported the same beliefs about their essential responsibilities that had been reported by superintendents of public elementary and secondary schools. The greatest disparity between the two groups of superintendents was in how they characterized their relationships with their governing boards: Generally, the residential school superintendents reported relationships that were less formal. The study, apparently the first attempt to profile superintendents of American residential schools for the Deaf, establishes a baseline for future studies of this kind. 相似文献
20.
As a sanitary, reproducible and inexpensive en-ergy resource, the hydroelectric generation has beenincreasingly used in recent years. A great number ofhuge dams have been constructed in the narrow gor-ges, with the height of around 300 m and the flooddischarging powers ranging from10 billion to100 bil-lion W. The maximum unit discharges all exceed 200m3/(s·m). With the characteristics of flood dis-charge such as high head, large discharge, narrowgorges and high frequency, the existing dams ha… 相似文献