山地城市流域水环境综合整治工程设计

工程针对山地城市河流纵坡大、岸坡陡、工程可利用土地少的特点,通过"四大系统、八大工程"的体系化设计,采取组合工艺,应用新技术、新设备,结合不同水体特点,"一河一策、一库一策",工程实施后,保障河道及水库的主要水质指标(TN除外)达到《地表水环境质量标准》(GB 3838-2002)Ⅳ类标准。

Urban Landscape Construction Guided by the Landscape City——a Case Study of Wanli District, Nanchang City, Jiangxi Province

Mountains and waters serve as important elements for urban spatial mor-phology, structure and eco-environment. Since scientist Qian Xuesen proposed the concept of landscape city, it has been an effective way for urban development in case of thousand-city in the same appearance. In the study, we analyzed the con-cept, connotation and approaches and proposed the ways to landscape city.

Quantitative evaluation of urban park cool island factors in mountain city

Evaluating how park characteristics affect the formation of a park cool island(PCI) is the premise of guiding green parks planning in mountain cities.The diurnal variation of PCI intensity was achieved,and correlations between PCI intensity and park characteristics such as park area,landscape shape index(LSI),green ratio and altitude were analyzed,using 3 010 temperature and humidity data from measurements in six parks with typical park characteristics in Chongqing,China.The results indicate that:1) the main factor determining PCI intensity is park area,which leads to obvious cool island effect when it exceeds 14 hm2;2) there is a negative correlation between PCI intensity and LSI,showing that the rounder the park shape is,the better the cool island effect could be achieved;3) regression analysis of humidity and PCI intensity proves that photosynthesis midday depression(PMD) is an important factor causing the low PCI intensity at 13:00;4) the multivariable linear regression model proposed here could effectively well predict the daily PCI intensity in mountain cities.

中国首条公里级高温超导电缆示范工程启动

2019年2月21日,中国首条公里级高温超导电缆示范工程启动大会在上海宝山城市工业园区举行,这意味着高温超导电缆示范工程作为上海加快超导技术产业化的重要突破口,已经做好了技术储备、工程建设、人才团队、产业承载的各项准备,标志着我国超导电缆实用产业化正式起步。启动大会上,宝山城市工业园区与上海超导产业联盟签订战略合作协议,发布了高温超导基地建设规划和招商政策.

Characteristics and Mechanism of Agricultural Transformation in Typical Rural Areas of Eastern China:A Case Study of Yucheng City,Shandong Province

Rural off-farm employment,rapid loss of agricultural land,and advanced technology popularization had led agricultural production in Chinese typical rural areas come at a critical transformation and upgrade stage.Based on sample survey data gathered from 401 households in Yucheng City,Shandong Province,this paper focuses on the characteristics and mechanism of agricultural transformation in typical rural areas of the eastern China.It was found that 74.3% of households surveyed kept at least one member engaging in off-farm employment,and 57.1% looked forward to expanding the operational scale of arable land,while just 13.7% had actually transferred their agricultural land.Since growing off-farm employment does not result in the collapse of traditional subsistence agriculture,therefore,agricultural production in Yucheng City is at an incomplete transformation phase from traditional small-holder farming to modern scale economy.It is caused by both macro environments and family characteristics,while urban-rural dual structure,imperfect rural development policy and agricultural technology popularization make peasant economy strengthen upon maintenance,and small-holder farming becomes peasant's natural response owing to pluriactivity,local off-farm employment,reverse elimination,etc.In order to achieve smooth agricultural transformation of typical rural areas in the eastern China,it needs to promote professional differentiation among peasants,under clear policies adopted by central government.Providing comprehensive services for agricultural production and improving production skills and knowledge of farmers who are still living in the countryside will effectively stimulate the process of agricultural transformation.

Storage and Density of Soil Organic Carbon in Urban Topsoil of Hilly Cities:A Case Study of Chongqing Municipality of China

Rapid urbanization results in the conversion of natural soil to urban soil,and consequently,the storage and density of the soil carbon pools change.Taking Chongqing Municipality of China as a study case,this investigation attempts to better understand soil carbon pools in hilly cities.First,the vegetated areas in the study area were derived from QuickBird images.Then,topsoil data from 220 soil samples(0-20 cm) in the vegetated areas were collected and their soil organic carbon(SOC) densities were analyzed.Using the Kriging interpolation method,the spatial pattern of SOC was estimated.The results show that the SOC density exhibited high spatial variability in the urban topsoil of Chongqing.First,the SOC density in topsoil decreased according to slope in the order 2°-6° < 25°-90° < 0°-2° < 6°-15° < 15°-25°.Second,the newly developed areas during 2001-2010 had a lower SOC density than the areas built before 1988.Third,urban parks and gardens had a higher SOC density in topsoil,residential green land followed,and scattered street green land ranked last.For hilly cities,the variability of terrain affects the distribution of SOC.The Kriging results indicate that Kriging method combining slope with SOC density produced a high level of accuracy.The Kriging results show that the SOC density to the north of the Jialing River was higher than the south.The vegetated areas were estimated to amount to 73.5 km2 across the study area with an SOC storage of 0.192 Tg and an average density of 2.61 kg/m2.

Projects for Accessibility and ＂Sustainable＂ Planning Alexandria （Egypt）： A Case Study

From a project oriented view point the concept of sustainability concerns a variety of themes. The evolution of any single city brings to light the fact that architecture and town planning have often expressed more than a merely stereotyped conception of ＂style＂, wherever its most significant achievements have responded to structural needs. For ＂sustainable urban development＂ we may assume the necessity of a ＂priority vision＂, according to which economic, ecologic and social potentials should be valued. This paper questions the notion of urban sustainability considering the port of Alexandria and is region at various levels. Today extending for many miles along the sea coast, the city entered a period of crisis in the 1950s when a mass exodus of foreigners followed transfer of the main activities to Cairo, while the surrounding area was subject to reclamation work as part of a plan for national development. An important event occurred in 1989 with the rebuilding of Alexandria＇s world-famous library, bringing with it a hope for revival of the city＇s ecumenical tradition and of the place it formerly held in world culture. While most of its five million inhabitants survive in a variety of unauthorised settlements and the rural areas have suffered severely from the pollution of Lake Maryut Alexandria is expanding by creation of＂gated communities＂, paralleled by intensive building for tourism along the western coast. This growing trend towards the ＂American way of life＂ is destroying any identity of place. Criticizing the unsustainability of the Alexandria of today, this paper focuses on potentials for polycentric development of the city as a vital part of its region and the Nile Delta, also considering that debate is in progress on the accomplishment of important infrastructural projects that may offer fresh opportunities for involving the topography and centuries-old life of the metropolis in designing the future city.

山城眺望空间OSCA模型构建及应用

山体是大自然赋予城市的天然景观资源,通过山与城市中建筑群构成的山城空间关系,可形成多类型的眺望景观。当前山城眺望景观在建设热潮中不断被破坏,逐渐消失在林立的高楼中,需要进行一定的控制和保护。以济南市中心城区为例,基于眺望控制分区,寻找城市建筑发展演变、分区建设的规律,结合元胞自动机与多智能体,提出基于眺望景观控制下的山城眺望空间CA-OSCA模型(Overlooking Space Cellular Automata),构建山城眺望空间演变模型。利用GIS等数据分析平台,对模拟结果进行分析,构建真实城市空间下的未来山城眺望空间景观三维模型,以更加直观、真实地方法探讨在眺望景观分区控制的影响下,未来城市空间结构的发展模式,最终为未来山城眺望景观空间的控制与保护以及眺望景观保护下,山城城市未来空间发展结构提出发展策略。