基于GIS的广州南沙新区居住适宜性评价研究     

文薪荐  吴坤泽 《测绘与空间地理信息》2021,44(7):55-58,63

国家级新区在经济发展、产业转型升级中的带动作用越来越重要,为此,对广州南沙新区范围内居住用地进行适宜性评价.本文基于GIS缓冲区分析技术,以南沙新区的学校、医院、超市、公交站、地铁站、道路、公园等方面作为指标,运用层次分析法建立评价指标体系,其次利用GIS叠置分析功能,对各指标数据进行加权叠加,并将叠加成果结果划分为5个等级,生成南沙新区居住适宜性综合评价专题图.实现了评价结果的可视化,为城市规划、居民选址提供一定的基础依据.  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987110000319   总被引：1，自引：1，他引：0  

Jiasheng Zhang  Xinjian Shan  Xiongnan Huang 《地学前缘(英文版)》2011,2(1):1-15

The 3-D geometry of the seismicity in Hindu Kush–Pamir–western China region has been defined by seismic records for 1975–1999 from the National Earthquake Information Center, the U.S. Geological Survey, and over 16,000 relocated earthquakes since 1975 recorded by the Xinjiang seismic network of China. The results show that most Ms ≥ 5.0 hypocenters in the area are confined to a major intracontinental seismic shear zone (MSSZ). The MSSZ, which dips southwards in Pamir has a north-dipping counterpart in the Hindu Kush to the west; the two tectonic realms are separated by the sinistral Chaman transform fault of the India–Asia collisional zone. We demonstrate that the MSSZ constitutes the upper boundary of a south-dipping, actively subducting Pamir continental plate. Three seismic concentrations are recognized just above the Pamir MSSZ at depths between 45–65 km, 95–120 km, and 180–220 km, suggesting different structural relationships where each occurs. Results from focal mechanism solutions in all three seismological concentrations show orientations of the principal maximum stress to be nearly horizontal in an NNW–SSE direction. The south-dipping Pamir subduction slab is wedge-shaped with a wide upper top and a narrow deeper bottom; the slab has a gentle angle of dip in the upper part and steeper dips in the lower part below an elbow depth of ca. 80–120 km. Most of the deformation related to the earthquakes occurs within the hanging wall of the subducting Pamir slab. Published geologic data and repeated GPS measurements in the Pamir document a broad supra-subduction, upper crustal zone of evolving antithetic (i.e. north-dipping) back-thrusts that contribute to north-south crustal shortening and are responsible for exhumation of some ultrahigh-pressure rocks formed during earlier Tethyan plate convergence. An alternating occurrence in activity of Pamir and Chaman seismic zones indicates that there is interaction between strike-slip movement of the Chaman transform fault system and deep-subduction of the Pamir earthquake zone. Pamir subduction-related seismicity becomes shallower in depth with increasing distance east of the transform fault. Therefore, sinistral movement of the Chaman transform fault appears to be influencing continental deep-subduction in the Pamir region and may provide an explanation for the unusual south-dipping geometry of the intracontinental Pamir plate.  相似文献   

农村村庄规划之我见     

张思睿  焦瑞亭  刘新建 《山东国土资源》2007,23(6):2006/5/11-2007/6/8

实行村庄规划，是建设社会主义新农村的客观要求，是解决农村宅基地现存问题的迫切需要。鄄城县国土资源局通过对鄄城县6个有代表性村庄的调研，结合农村宅基地管理工作实践，总结了农村村庄规划的必要性，提出了开展村庄规划的意见和建议。  相似文献   

中国古建筑简化分析研究   总被引：1，自引：1，他引：0  

高大峰  曹鹏男  丁新建 《地震工程与工程振动》2011,31(2):175-181

为研究中国古建筑的固有特性和抗震性能,根据西安城南门箭楼复原工程资料,采用半刚性弹簧单元来模拟实体结构的榫卯、斗拱和柱础连接,建立箭楼大木作构架的局部和整体两种有限元模型.采用Block Lanczos方法,分别进行模态分析,得出模型的前10阶频率和振型;采用瞬态分析方法,在El Centro波、Taft波和兰州人工波...  相似文献   

亚像素相位相关法在获取汶川地震近场形变中的应用          下载免费PDF全文

刘云华  单新建  屈春燕  宋小刚  张桂芳 《地震地质》2013,35(1):138-150

震后地表实际破裂带的分布及其近场的形变特征,是理解块体运动学特性、断层破裂特征、地震发生机制等科学问题的十分重要的约束条件。基于InSAR获取的汶川地震同震形变场,由于发震断层附近同震形变梯度巨大,沿断层带出现了非相干条带,以致于无法获得断层附近的形变量。而基于亚像素级的光学影像偏移量法为获取断层附近大形变分布提供了可能。文中以SPOT卫星影像为数据源,采用光学影像偏移量法获得了什邡及茂县地区的水平位移形变场。结果显示龙门山断裂带上至少2条断裂同时发生破裂,形成了主要地表破裂带(龙门山镇-高川破裂带)和次级地表破裂带(汉旺破裂带),沿龙门山镇-高川破裂带平均位移量为4～6m,在高川附近伴随的平均右旋水平位移为1～3m; 汉旺破裂带因逆冲导致水平缩短,平均位移量一般为1～2m。汶川-茂县断裂带没有明显的地表破裂带。研究表明,利用光学影像相位相关法能够获得近断层位错量,可以成为InSAR手段的重要补充。  相似文献   

Using finite element and Okada models to invert coseismic slip of the 2008 Mw 7.2 Yutian earthquake, China, from InSAR data     

Chisheng Wang  Xinjian Shan  Changlin Wang  Xiaoli Ding  Guohong Zhang  Timothy Masterlark 《Journal of Seismology》2013,17(2):347-360

We invert InSAR from ascending and descending passes of ENVISAT/ASAR data to estimate the distribution of coseismic slip for the 2008 Mw 7.2 Yutian earthquake by separately using uniform finite element models (FEMs), non-uniform FEMs, and analytical elastic half-space (Okada) models. We use the Steepest Descent method and Laplacian smoothing to regularize and estimate the slip distribution for each of these different models. Fault surface ruptures interpolated from Quickbird optical images constrain the strike of the fault. The uniform FEM and Okada models assume a fault embedded in a homogeneous and elastic finite domain or half-space, respectively, while the non-uniform FEM describes a domain with spatially variable elastic properties according to the geological structure of Tibet plateau and Tarim. We find that the estimated slip distribution of the non-uniform FEM is similar to that of the uniform FEM but has a slightly larger moment (~2 %). However, more noticeable discrepancies occur between the slip distributions of the uniform FEM and Okada model, where the slip pattern estimated with the FEM looks more scattered and locates at a lower depth. We conclude that, for the case of the Yutian earthquake, the improvement brought by simulating the distribution of geologic material properties is insignificant. This suggests that the uniform geologic structure of Okada models may be sufficient for simulating large intra-continental earthquakes.  相似文献   

SAR遥感图像在汶川地震灾害识别中的应用   总被引：4，自引：0，他引：4       下载免费PDF全文

刘云华  屈春燕  单新建  宋小刚  张桂芳  张国宏 《地震学报》2010,32(2):214-223

汶川地震发生后,受阴雨天气的影响,光学遥感影像在救灾决策中的作用受到了很大的限制,而SAR图像由于其全天候的特点成为这次抗震救灾前期遥感信息保障十分重要的数据源.采用ENVISAT的ASAR作为数据源,利用多时相的雷达数据的幅度及相位信息对映秀及周边地区做了地震灾害识别,其中利用震前震后的幅度图像做比值变化检测,在映秀镇及紫坪铺水库等山区取得了较好的效果;利用相位信息做干涉处理得到的相干图像,经过失相干分析,发现建筑物的破坏等级与相干系数变化指数的大小高度相关.比较这两种方法,在都江堰等平原地区由于失相干现象不像山区那么严重,并且利用比值处理可以去除部分空间失相干及系统热噪声等带来的干扰因素,可以成为幅度图像的有益补充.结果表明,结合SAR幅度影像和干涉相干影像,可以在地震灾害评估中取得更好效果.随着极化干涉雷达技术的日益成熟,多时相幅度信息、相位信息等多特征SAR影像信息的融合会在救灾决策中发挥更大的作用.  相似文献   

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洪顺英  单新建  刘智荣  申旭辉  戴娅琼  荆凤 《大地测量与地球动力学》2013,33(1):6-12

????OKADA??????????????????????????????????????????????α???????????????????????α??????????????????????????,??????????,???????α?????-109.7 cm??????????????????α????19.2 cm??????????????????????????????????????α?????-51.4 cm????????????,????α?????98.5 cm???????????????????????????????????????α?????-66.5 cm?????????????????????α????25.8 cm????????????α?????????????????????????????????????α????????????????????????????????????????????  相似文献   

气候变化对新疆哈密瓜种植气候区划的影响     

普宗朝  张山清  吉春容  李景林  李新建  王命全  邹陈 《气候变化研究进展》2015,11(2):115-122

基于新疆101个气象台站1961-2013年逐日平均气温、最高气温、最低气温和日照时数资料,采用线性趋势分析、累积距平、保证率分析以及ArcGIS空间插值方法,分析影响哈密瓜种植的关键气候因子（日平均气温稳定≥15℃日数、≥20℃光温指数以及6-8月平均气温日较差）时空变化特征,并结合各气候因子突变前、后的变化特征,研究了气候变化对新疆不同熟型哈密瓜最佳种植区、次佳种植区和不宜种植区分布区域及其面积的影响。结果表明：新疆≥15℃日数、≥20℃光温指数、6-8月平均气温日较差的空间分布表现为“南疆多、北疆少,东部多、西部少,平原和盆地多、山区少”的特点。近53年,新疆≥15℃日数以2.493 d/10a的倾向率显著增多（P＜0.001）,≥20℃光温指数以0.06/10a的倾向率显著增大（P＜0.001）,6-8月平均气温日较差以-0.249℃/10a的倾向率显著（P＜0.001）减小,各要素还分别于1997年和1987年发生了突变。新疆哈密瓜种植气候可分为4个大区和7个亚区。受气候变化的影响,1997年后较其之前,新疆中、晚熟哈密瓜最佳种植区明显扩大,次佳种植区有所减小;早熟哈密瓜适宜种植区以及哈密瓜不宜种植区也不同程度地减小。  相似文献   

山东省测墒站农气测报业务软件简介     

马新建  王晓  信志红 《山东气象》2008,28(3):62-63

山东省测墒站农气测报业务软件Ver1．0是根据新的《山东省农业气象测报业务规范（试行）》研制的一款软件,介绍了该软件的系统结构、功能及适用环境。该软件具有针对性强、技术成熟、界面友好、操作简单等特点,模块化设计,对硬件要求低,极具推广价值。  相似文献