As the Wenchuan Earthquake was of high magnitude and shallow seismic focus, it caused great dam- age and serious geohazards. By the field investigation and the interpretation of remote-sensing infor- mation after the ...As the Wenchuan Earthquake was of high magnitude and shallow seismic focus, it caused great dam- age and serious geohazards. By the field investigation and the interpretation of remote-sensing infor- mation after the earthquake and by using means of GIS technology, the distribution of geohazards triggered by the earthquake are analyzed and the conclusions are as follows: (1) The earthquake geo- hazards showed the feature of zonal distribution along the earthquake fault zone and linear distribution along the rivers; (2) the distribution of earthquake geohazards had a marked hanging wall effect, for the development density of geohazards in the hanging wall of earthquake fault zone was obviously higher than that in the foot wall and the width of strong development zone in the hanging wall was about 10 km; (3) the topographical slope was a main factor which controlled the development of earthquake geo- hazards and a vast majority of hazards were distributed on the slopes of 20° to 50°; (4) the earthquake geohazards had a corresponding relationship with the elevation and micro-landform, for most hazards happened in the river valleys and canyon sections below the elevation of 1500 to 2000 m, particularly in the upper segment of canyon sections (namely, the turning point from the dale to the canyon). Thin ridge, isolated or full-face space mountains were most sensitive to the seismic wave, and had a striking amplifying effect. In these areas, collapses and landslides were most likely to develop; (5) the study also showed that different lithologies determined the types of geohazards, and usually, landslides oc- curred in soft rocks, while collapses occurred in hard rocks.展开更多
新型城镇化强调要推进城乡基本公共服务的均等化,保障和改善民生是十三五建议中各项工作战略的重要内容。合理的城乡公共服务设施布局,则是实现上述内容的重要保障之一。针对重庆市长寿区现状设施空间布局中存在的空白区和低效率等问题...新型城镇化强调要推进城乡基本公共服务的均等化,保障和改善民生是十三五建议中各项工作战略的重要内容。合理的城乡公共服务设施布局,则是实现上述内容的重要保障之一。针对重庆市长寿区现状设施空间布局中存在的空白区和低效率等问题,根据均等化的原则,创新性地提出了适宜于山地城镇建设的公共服务设施均等化配置方法。即划分不同层次的服务中心,并通过G I S手段建立综合配置模型,对人口、交通、地形、聚集度等条件进行综合评价,将原有的"城—镇—村"配置结构转变为一种全面覆盖、集约共享、分级可达的城乡公共服务设施网络体系,从而提高了广大农村地区公共服务设施的集聚性、可达性和规模效益,实现了城乡公共服务设施的均等化布局。展开更多
基金Supported by the Key Basic Research Program of the Ministry of Science and Tech-nology of China (Grant No. 2008CB425800)
文摘As the Wenchuan Earthquake was of high magnitude and shallow seismic focus, it caused great dam- age and serious geohazards. By the field investigation and the interpretation of remote-sensing infor- mation after the earthquake and by using means of GIS technology, the distribution of geohazards triggered by the earthquake are analyzed and the conclusions are as follows: (1) The earthquake geo- hazards showed the feature of zonal distribution along the earthquake fault zone and linear distribution along the rivers; (2) the distribution of earthquake geohazards had a marked hanging wall effect, for the development density of geohazards in the hanging wall of earthquake fault zone was obviously higher than that in the foot wall and the width of strong development zone in the hanging wall was about 10 km; (3) the topographical slope was a main factor which controlled the development of earthquake geo- hazards and a vast majority of hazards were distributed on the slopes of 20° to 50°; (4) the earthquake geohazards had a corresponding relationship with the elevation and micro-landform, for most hazards happened in the river valleys and canyon sections below the elevation of 1500 to 2000 m, particularly in the upper segment of canyon sections (namely, the turning point from the dale to the canyon). Thin ridge, isolated or full-face space mountains were most sensitive to the seismic wave, and had a striking amplifying effect. In these areas, collapses and landslides were most likely to develop; (5) the study also showed that different lithologies determined the types of geohazards, and usually, landslides oc- curred in soft rocks, while collapses occurred in hard rocks.
文摘新型城镇化强调要推进城乡基本公共服务的均等化,保障和改善民生是十三五建议中各项工作战略的重要内容。合理的城乡公共服务设施布局,则是实现上述内容的重要保障之一。针对重庆市长寿区现状设施空间布局中存在的空白区和低效率等问题,根据均等化的原则,创新性地提出了适宜于山地城镇建设的公共服务设施均等化配置方法。即划分不同层次的服务中心,并通过G I S手段建立综合配置模型,对人口、交通、地形、聚集度等条件进行综合评价,将原有的"城—镇—村"配置结构转变为一种全面覆盖、集约共享、分级可达的城乡公共服务设施网络体系,从而提高了广大农村地区公共服务设施的集聚性、可达性和规模效益,实现了城乡公共服务设施的均等化布局。
