In order to get the 3-D fine velocity structure in the Capital-circle area of China, 6 explosions, ranging from 1800 to 2500 kg, were conducted and recorded by an array of 240 seismographs. A reflection/refraction su...In order to get the 3-D fine velocity structure in the Capital-circle area of China, 6 explosions, ranging from 1800 to 2500 kg, were conducted and recorded by an array of 240 seismographs. A reflection/refraction survey was carried out along the profile extending from Anxin county, Hebei Province northeastward to Yanshan Mountains, crossing the Zhangjiakou-Bohai tectonic zone. The 2-D velocity structure of P wave was imaging along the profile. The results show that abnormality exists in the deep structure of the Zhangjiakou-Bohai tectonic zone: The base- ment is significantly depressed, the interfaces and Moho are uplifted, and a strong velocity gradient layer is existed above the Moho that may be dislocated by deep fault. The crust of Huabei basin is thin and low velocity body ex- ists in the crust. The Yanshan Mountains′ crust is thick, the layers in the crust are quite clear and the velocity in the layer is homogeneous. Huabei basin differs from Yanshan Mountains in structure.展开更多
容积率(Floor Area Ratio, FAR)是反映土地开发强度的核心指标,可作为城市空间结构和形态的测度指标,其空间特征分析对城市相关因素影响机理研究、评价城市规划成效等方面具有重要意义。已有研究多以居住区FAR为研究对象,难以全面分析...容积率(Floor Area Ratio, FAR)是反映土地开发强度的核心指标,可作为城市空间结构和形态的测度指标,其空间特征分析对城市相关因素影响机理研究、评价城市规划成效等方面具有重要意义。已有研究多以居住区FAR为研究对象,难以全面分析整个城市建筑,本研究将高德地图的建筑矢量数据与测绘数据结合计算FAR,结合土地利用信息在不同尺度上对其空间特征进行分析,包括空间总体特征、空间集聚特征和空间结构特征。研究结果表明,城市建筑主要功能为居住功能和生产功能,研究区的土地利用强度仍有提升空间;街道尺度的FAR空间集聚特征为单中心结构;地块尺度的FAR空间集聚特征为多中心结构;利用圈层结构模型计算各地类圈层FAR,不同地类表现出不同规律,城市扩张态势明显,而公共服务等配套建设不足;利用核密度法根据地块FAR识别出沈阳城市中心13个,当前的多中心结构尚不能满足居民生活和城市发展需求。展开更多
基金Preliminary study of State Key Basic Research Project (2001CCA02100) and National Natural Science Foundation of China (40234038).
文摘In order to get the 3-D fine velocity structure in the Capital-circle area of China, 6 explosions, ranging from 1800 to 2500 kg, were conducted and recorded by an array of 240 seismographs. A reflection/refraction survey was carried out along the profile extending from Anxin county, Hebei Province northeastward to Yanshan Mountains, crossing the Zhangjiakou-Bohai tectonic zone. The 2-D velocity structure of P wave was imaging along the profile. The results show that abnormality exists in the deep structure of the Zhangjiakou-Bohai tectonic zone: The base- ment is significantly depressed, the interfaces and Moho are uplifted, and a strong velocity gradient layer is existed above the Moho that may be dislocated by deep fault. The crust of Huabei basin is thin and low velocity body ex- ists in the crust. The Yanshan Mountains′ crust is thick, the layers in the crust are quite clear and the velocity in the layer is homogeneous. Huabei basin differs from Yanshan Mountains in structure.
文摘容积率(Floor Area Ratio, FAR)是反映土地开发强度的核心指标,可作为城市空间结构和形态的测度指标,其空间特征分析对城市相关因素影响机理研究、评价城市规划成效等方面具有重要意义。已有研究多以居住区FAR为研究对象,难以全面分析整个城市建筑,本研究将高德地图的建筑矢量数据与测绘数据结合计算FAR,结合土地利用信息在不同尺度上对其空间特征进行分析,包括空间总体特征、空间集聚特征和空间结构特征。研究结果表明,城市建筑主要功能为居住功能和生产功能,研究区的土地利用强度仍有提升空间;街道尺度的FAR空间集聚特征为单中心结构;地块尺度的FAR空间集聚特征为多中心结构;利用圈层结构模型计算各地类圈层FAR,不同地类表现出不同规律,城市扩张态势明显,而公共服务等配套建设不足;利用核密度法根据地块FAR识别出沈阳城市中心13个,当前的多中心结构尚不能满足居民生活和城市发展需求。
