肇庆市旅游地目标定位的回顾、策划与分析

肇庆这座全国著名旅游城市的旅游地目标定位的发展有种种历史渊源 ,新世纪肇庆旅游地目标应该有新的定位 ,由此对肇庆及其相关旅游区域和市场的旅游资源进行了深入分析 ,试图说明肇庆旅游地目标新定位的正确性。     

The grey-green divide: multi-temporal analysis of greenness across 10,000 urban centres derived from the Global Human Settlement Layer (GHSL)

ABSTRACT

The presence of green spaces within city centres has been recognized as a valuable component of the city landscape. Vegetation provides a variety of benefits including energy saving, improved air quality, reduced noise pollution, decreased ambient temperature and psychological restoration. Evidence also shows that the amount of vegetation, known as ‘greenness’, in densely populated areas, can also be an indicator of the relative wealth of a neighbourhood. The ‘grey-green divide’, the contrast between built-up areas with a dominant grey colour and green spaces, is taken as a proxy indicator of sustainable management of cities and planning of urban growth. Consistent and continuous assessment of greenness in cities is therefore essential for monitoring progress towards the United Nations Sustainable Development Goal 11. The availability of multi-temporal greenness information from Landsat data archives together with data derived from the city centres database of the Global Human Settlement Layer (GHSL) initiative, offers a unique perspective to quantify and analyse changes in greenness across 10,323 urban centres all around the globe. In this research, we assess differences between greenness within and outside the built-up area for all the urban centres described by the city centres database of the GHSL. We also analyse changes in the amount of green space over time considering changes in the built-up areas in the periods 1990, 2000 and 2014. The results show an overall trend of increased greenness between 1990 and 2014 in most cities. The effect of greening is observed also for most of the 32 world megacities. We conclude that using simple yet effective approaches exploiting open and free global data it is possible to provide quantitative information on the greenness of cities and its changes over time. This information is of direct interest for urban planners and decision-makers to mitigate urban related environmental and social impacts.     

《巴黎协定》特设工作组适应信息通报谈判的最新进展和展望

适应信息通报作为《巴黎协定》下联结国家个体适应行动、全球适应目标以及全球集体适应努力的纽带,是目前《巴黎协定》特设工作组（APA）下唯一的适应议题,会对未来全球适应气候变化的政策和行动产生较大影响。本文总结了APA适应信息通报的谈判进程和最新进展,梳理了不同缔约方和谈判集团对适应信息通报目的、内容、报告渠道、指南和灵活性的立场和观点,展望了适应信息通报未来的谈判走势。中国与大多数发展中国家相比,开展适应行动及提供信息报告的能力较强,在适应信息通报谈判中立场相对灵活,但未来在有关适应的资金支持谈判等方面仍面临着压力,建议推动和深化适应气候变化领域南南合作以团结更多发展中国家,促进全球适应行动,回应发展中国家的关切。     

Introducing run-size driven fisheries management for the coastal fishery of Atlantic salmon: Preseason forecasts for policy makers

The Finnish coastal fishery of Atlantic salmon (Salmo salar) in the northern Baltic Sea is regulated using multi-annual, pre-fixed, opening dates of harvests that aim to enhance spawning escapement of early migrating wild salmon. Such an inflexible management regime does not set regulations that track varying run sizes of salmon. We introduce an array of computational intelligence techniques to estimate and forecast coastal run size and escapement of salmon into three spawning rivers in the northern Baltic Sea. Our results indicated that the present management pattern, driven largely by regional fisheries policy, contrasts greatly with a “run-size driven” (i.e. abundance-based) management approach. Introducing run-size driven management, i.e. setting regulations annually by tracking preseason forecasts, would better ensure adequate escapement and at the same time allow the maintenance of coastal catch at sustainable level. Setting regulations annually would allow effective harvesting in years when the run is high, and would effectively restrict harvests when the run is low.     

生态系统服务对国土空间规划体系的理论与实践支撑

空间规划体系改革是推进生态文明建设的重大举措。面向新的国土空间规划体系,如何整合不同空间尺度下的政策,如何协调人类活动并保护生态格局和自然资源,是空间规划的核心问题,亟需吸纳多学科视角和知识加以回答。生态系统服务关联生态系统与人类福祉,是优化国土空间、推动规划决策更加符合生态文明理念的重要工具。本文立足于国土空间规划体系的构建需求,通过文献梳理和理论分析,从多个维度探讨了生态系统服务对空间规划体系构建的支撑作用。首先,对生态系统服务与空间规划价值目标的关联进行了基本判断,明确了生态系统服务不仅是空间规划进行自然资源价值塑造的载体,也是空间规划面向公共福祉的政府选择。其次,针对国家、省级以及市县和乡镇各纵向层级总体规划的功能定位和内容重点,分别剖析了生态系统服务对实现规划的战略性和政策性、协调性和操作性的支撑作用,并从尺度效应视角探讨了其对构建规划协同机制的促进作用。最后,面向“多规合一”的横向衔接需求,提出生态系统服务在培育部门共同价值,协同多元主体利益及改进空间规划技术三方面的重要作用。研究为指导空间规划体系改革提供理论支持和可行路径,丰富深化了生态系统服务在政策制定中的应用。     

基于改进的角度偏差法的采空区点云数据精简

在保证采空区几何特征不变的前提下,有必要对点云数据进行精简,提高三维建模及其应用的效率。介绍了点云数据精简算法的评价体系,探讨了空区探测系统扫测采空区的点云数据特点;在对比最小距离法、平均距离法、角度偏差法、弦高偏差法等采空区点云数据精简方法的基础上,提出了保留采空区几何特征更为有效的点云数据精简方法——改进的角度偏差法。通过对比精简前后的扫描线周长、面积及标准差等指标,认为该方法不但保持了扫描线的细节,而且使精简后扫描线上的点分布较均匀,为后续三维建模及应用打下良好基础。     

基于目标规划与模拟退火算法的土地利用分区优化方法

以兰州市榆中县为实验区,选取分区适宜性、规划协调性和空间紧凑性作为分区目标,基于目标规划和模拟退火算法对实验区进行土地利用分区优化。结果表明,不同情景下的分区方案能很好地满足决策者设定的目标偏好值;从空间特征分析的结果看,本分区方案较原有分区方案对各个分区目标进行了优化,更好地满足了农业生产、经济发展以及生态保护的要求。     

气候资料分布式数据库总体框架探讨

文章着重阐述了系统目标，要求在数据表示、数据结构、应用接口和用户界面等方面实行统一规范，以保证数据的一致性和互换性，从而使气象系统及非气象系统的相关系统均可纳入一个总的框架，相互连接，彼此调用。同时，阐述了系统的结构。该系统在地理上是国家-区域-省-地气候资料数据库的多数据结构，但在分布式数据库管理系统控制下，在逻辑上是一个整体数据库。     

中国大陆科学钻探工程项目进展综述

阐明了中国大陆科学钻探工程的意义与目标，论述了工程建设的主要内容和项目的组织管理，介绍了项目的进展情况。