Numerical evaluation of land subsidence induced by dewatering in deep foundation pit

To predict the behavior of land subsidence due to groundwater withdrawal, a 3D numerical model is established. The model takes the confined aquifer and soft deposit of Ningbo into account. According to the pumping test data, changing regulations of groundwater level, and land subsidence during dewatering are analyzed. Comparison between the calculated value and measured value shows that the 3D model simulates the measured value fairly well. The future behavior of land subsidence during dewatering period provides the scientific basis for the construction of deep foundation.     

城市轨道交通对城市发展的支持和引导作用——以北京城市轨道交通为例

城市轨道交通对城市的发展具有极大的支持和引导作用。本文以北京市轨道交通规划和建设情况为例,分析了北京市轨道交通线网规划和北京城市总体规划的关系,分析阐述了轨道交通与城市形态、土地利用的相互作用。分析表明轨道交通可以促使中心城土地功能布局的调整和优化,引导新城的合理发展,要通过科学合理的规划控制,为建设宜居城市提供有力保障,实现城市的可持续发展．     

战时陆军防空兵车辆装备抢修作业效能评估研究

战时陆军防空兵车辆装备抢修作业是迅速恢复陆军防空兵机动能力的重要手段,其作业能力的大小直接影响陆军防空兵伴随防空作战效能,因此,应高度关注其车辆装备抢修工作,对其进行客观、定量的评估。对防空作战单元机动效能指数的确立提出修正意见,可为提高陆军防空兵伴随防空作战能力提供参考。     

中国城市职住均衡实证分析与关键对策

居住与就业岗位、居住区生活设施配套以及公共设施的空间配置决定了城市居民出行总量和出行距离,即职住均衡是缓解城市交通拥堵的源头管理措施。首先提出职住混合度、职住均衡度两个评价指标及其计算方法,并对辽阳市和齐齐哈尔市两个案例城市进行量化分析;结果表明,城市职住分布对居民出行距离有显著影响,相似的城市规模下,职住均衡良好的城市居民平均出行距离较短。在此基础上,分析职住均衡的主要影响因素及其影响规律,并阐述了生态城市单元与职住均衡的关系。最后,提出促进职住均衡面临的主要问题和关键对策。     

城市职住平衡的影响因素及改善对策

从城市职住平衡的影响因素出发,以城市发展政策、土地开发政策、交通系统发展、居民收入与产业发展等视角探讨大城市职住平衡形成的政策与规划因素。然后,从政策和规划两个层面思考促进城市职住平衡实现的途径。指出调整城市发展政策是调整职住平衡的根本,而职住平衡是一个动态过程,必须研究政策对职住平衡发展过程的影响。强调通过大城市活动组织分区来控制出行距离,在这些分区内城市服务配置相对完善、就业与居住平衡。最后指出,在把握职住平衡形成规律的基础上应充分考虑弹性,在城市空间规划与交通规划中坚持城市活动分区组织,同时将发展时序与政策有效结合。     

An Assessment of Coastal Development and Land Use Change Using the DPSIR Framework: Case Studies from the Eastern Cape,South Africa

Coastal areas are experiencing high levels of development, largely driven by a number of aesthetic and recreational factors, increased mobility, availability of disposable income for middle and upper income groups and the promise of job opportunities and improved economic well-being for lower income groups. As existing coastal urban nodes expand development “shifts” to less developed areas and places increasing pressure on the surrounding natural environment. This article considers the coastal zone of two municipalities in the Eastern Cape, South Africa, with similar environmental characteristics but disparate socioeconomic and governance histories. It identifies and integrates the drivers of development and land use change in the coastal zone of these municipalities by means of an adapted Driver-Pressure-State-Impact-Response (DPSIR) Framework. Development and land use change are driven by a combination of social, economic, and legislative factors that need to be considered for future management and planning in this unique dynamic system.     

Land use implications of sea level rise: A case study at myrtle beach,South Carolina

Abstract

the prospect of global warming and consequent sea level rise will have important implications for coastal communities. this article examines the land use implications of alternate sea level rise scenarios on the city of myrtle beach, south carolina. current trends as well as high and low sea level rise scenarios are superimposed on the city's beach profile and near shore contours to estimate the type and value of land development likely to be impacted.

It is found that losses associated with accelerated sea level rise would be particularly high in the city's hotel district and that overall property loss could range from 21 to 60% of the city's total property value. to lessen these potential losses, coastal communities such as myrtle beach must choose among one of three policy options including: (1) barricade the beach, (2) raise the land, and (3) implement a strategic retreat. specific alternatives within each of these options are explored in turn. the article concludes that successful development plans will incorporate ground rules sensitive to and consistent with dynamic coastal processes.     

Integrating a traffic router and microsimulator into a land use and travel demand model

Abstract

This paper describes one of the first known attempts at integrating a dynamic and disaggregated land-use model with a traffic microsimulator and compares its predictions of land use to those from an integration of the same land-use model with a more traditional four-step travel demand model. For our study area of Chittenden County, Vermont, we used a 40-year simulation beginning in 1990. Predicted differences in residential units between models for 2030 broken down by town correlated significantly with predicted differences in accessibility. The two towns with the greatest predicted differences in land use and accessibility are also the towns that currently have the most severe traffic bottlenecks and poorest route redundancy. Our results suggest that this particular integration of a microsimulator with a disaggregated land-use model is technically feasible, but that in the context of an isolated, small metropolitan area, the differences in predicted land use are small.     

苏州市古城区交通拥堵成因分析及治理策略

从土地利用与产业布局不均衡、典型道桥设施缺陷以及交通管理因素3个方面分析苏州市古城区交通拥堵的成因,并根据苏州市的实际情况,提出缓解苏州市古城区交通拥堵的策略与建议,希望能对交通管理者和决策者提供帮助。     

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长期以来,作为城市规划研究热点,城市土地利用和交通之间相互影响的研究相对脱节.近年来,该状况逐渐得到改观,研究人员开始将交通规划与城市用地布局方式相联系.本研究主要模拟给定城市区域土地利用的时空变化过程,帮助正确认识及处理城市交通发展与土地利用的相互关系.研究针对美国佛罗里达州Orange County 1990年与2000年土地利用类型的变化,利用元胞自动机(CA)在微观土地利用,空间格局等方面的优势,采用地理信息系统动态模型来实现海量数据的获取、储存以及更新.同时,借助MatLAB软件的数学计算能力,开发出基于逻辑回归的元胞自动机土地预测模型.基于实际土地利用的模拟结果表明,该模型充分利用元胞自动机的特点及优势,合理考虑土地利用系统中时空变量的复杂性,结果可靠,为正确理解土地利用变化提供了很好的帮助.