居住区绿色空间的生态规划与设计——以珠海华发新城为例

居住区绿色空间是城市绿色空间的重要组成部分，它对提高居民的生活环境质量，增进居民的身心健康至关重要，具有重要的生态服务功能。从生态学的角度出发，提出了居住区绿色空间生态规划的8项原则，并以珠海华发新城为例，从滨河公园、住区外围防护绿色空间、建筑组团外围和庭院绿色空间、建筑架空底部绿色空间、屋顶和垂直绿化等方面进行了规划设计。     

马莲河水体中Cr+6来源调查

Cr+6是毒性最强的铬化合物.本文通过现场调查,对马莲河水体中Cr+6的来源进行了研究.结果表明,马莲河水体中Cr+6来自于地下泛水.     

四川盆地臭氧浓度空间分异及驱动因子研究

为揭示四川盆地臭氧（O₃）的空间分布格局及其驱动因子,通过对2015~2017年四川盆地18城市82个国控环境监测站的O₃浓度观测数据,使用空间自相关,空间热点探测及地理探测器等地统计方法分析研究.结果表明：2015~2017年四川盆地O₃浓度总体呈现上升趋势（由2015年的（79.95±18.82） μg/m³上升到2017年的（88.64±11.67）μg/m³）,污染态势逐年加重.盆地中西部成都,资阳,雅安等城市O₃浓度最高,且高值区范围逐年扩大.O₃浓度的空间分布呈现出显著的聚集性规律（空间正相关,Moran's I指数大于0）,且年聚集区（H-H聚集区或L-L聚集区）主要呈现为H-H聚集区分布在盆地中西部,L-L聚集区分布在盆地东南部.此外,年聚集区的年际变化与浓度变化态势基本一致,即O₃浓度上升（降低）的区域转变为H-H聚集区（L-L聚集区）.基于地理探测器定量分析了二十个社会经济及自然驱动因子对O₃浓度空间分异的影响,结果显示社会经济因子占主导作用,其中城建用地占区面积比重（驱动值,q=0.5734）,人口密度（q=0.5479）的驱动作用最为突出,自然因子中年降水量（q=0.4592）具有最显著的驱动作用;地理探测器双因子交互对O₃浓度空间分异的影响有明显的交互增强作用（每个单因子q值平均增大了1.5~2.1倍）,且交互均值（即各因子交互q值的均值）与最大交互值逐年增大.在使得交互值达到最大驱动值的双因子中,出现频率最高的是人口密度（7次）和工业烟粉尘排放量（7次）.     

燃气管线相邻地下空间安全监测方法及其应用研究

城市燃气管线泄漏极易导致火灾爆炸等重大安全事故,严重威胁城市安全。通过监测预警技术,快速准确地发现泄漏,防止可燃气体聚集,是保障燃气管线安全运行的重要手段。提出了一种燃气管线相邻地下空间安全监测预警方法,构建了风险识别、预测预警、分析推演和决策支持一体化安全监测系统,并应用于合肥市2.5 km燃气管线及其相邻空间高风险区域。结果表明,提出的燃气管线相邻地下空间安全监测方法可用于燃气管线泄漏监测预警,以减少或避免燃气泄漏引发的火灾爆炸事故。     

基于熵权物元可拓模型的地下空间火灾安全评价

为了准确评价地下空间的安全性,降低地下空间火灾事故的风险,从地下空间主动防火能力、地下空间被动防火能力、安全疏散能力以及安全管理能力4个层次构建地下空间火灾安全评价指标体系。采用熵权法和物元可拓理论建立了地下空间火灾风险的熵权可拓评价模型,并在某地下商城的火灾安全评价中进行了实际应用。结果表明,该地下商场空间的火灾安全评价等级为二级,与实际地下商场火灾安全状态相符。本文研究表明基于熵权的可拓理论可以适用于地下空间火灾的安全评价,有利于提升地下空间的火灾风险应对。     

感温自启动灭火管系统应用于密闭空间的试验研究

为了对比Novec 1230（全氟己酮）感温自启动灭火管系统与R236fa（六氟丙烷）感温自启动灭火管系统的灭火效率,采用火灾实体试验的方法,分析了不充压,0.88,1.81 MPa下2系统的灭火时间、破裂动作温度及降温冷却效果。研究结果表明:2种灭火管系统都成功灭火,且 R236fa灭火管系统灭火时间更短;2种灭火管系统的破裂动作温度均在80 ℃以上;不充压和0.88 MPa时,2种灭火管系统降温冷却效果相差不大,但充压1.81 MPa时Novec 1230灭火管系统对环境温度的降温冷却作用更强。     

集成仿真在空间望远镜设计和优化中的应用

针对空间望远镜设计过程中涉及学科多、系统复杂、真实环境验证难度大等特点,集成仿真在空间望远镜设计和优化过程中具有巨大应用价值。本文给出了集成仿真在NGST、NEXUS和JWST等空间望远镜设计过程中的应用实例,介绍了集成仿真所包括的扰动源、结构、光学、控制和模型集成等方面的具体内容,并给出了集成仿真在性能分析、灵敏度分析、同效性分析、多目标优化和干扰来源定位与缓解等方面的应用。集成仿真技术及其应用案例,对我国在研大型空间望远镜的设计有指导和借鉴意义。     

The ‘green’ and ‘self’ in green self-governance – a study of 264 green space initiatives by citizens

Scholars observe an increased involvement of citizens in green space governance. This paper focuses on green self-governance, in which citizens play a major role in realizing, protecting and/or managing green space. While existing research on green self-governance focuses mostly on specific cases, we aim to contribute towards a large overview via an inventory of 264 green self-governance practices across The Netherlands. With this, we discuss the relevance of green self-governance for nature conservation and its relationship with authorities. In our analysis, we show that green self-governance practices are very diverse: they pursue a wide variety of physical and social objectives; employ a multitude of physical and political activities; involve different actors besides citizens; mobilize different internal and external funding sources; and are active within and outside of protected areas. While green self-governance can contribute towards protection and management of green space and towards social values, we highlight that this contribution is mostly of a local relevance. Most practices are small scale and objectives do not always match those of authorities. Although we speak of self-governance, authorities play an important role in many practices, for example, as financial donor, landowner or regulatory authority. In this, self-governance is often not completely ‘self’.

Abbreviations: PAA: Policy Arrangement Approach; NNN: National Nature Network; N2000: Natura 2000; NCOs: Nature Conservation Organizations; NGOs: Non-governmental organizations     

Bridging the gap between ecosystem service assessments and land-use planning through Multi-Criteria Decision Analysis (MCDA)

Land-use planning is an important determinant for green space policy in cities. It defines land covers and hence the structure and function of urban ecosystems and the benefits these provide to humans, such as air purification, urban cooling, runoff mitigation, and recreation. The ecosystem service approach has helped to attract policy attention to these benefits but the concept remains poorly implemented in urban policy and governance. To address this gap, we advance a framework to bridge ecosystem services into policy processes through Multi-Criteria Decision Analysis (MCDA) as decision support tool. The paper is organized in three main parts. First, we conduct a systematic literature review to assess state-of-the-art knowledge on ecosystem service assessments through MCDA. Next, we build on insights from the literature review to develop the ‘ecosystem services policy-cycle’, a conceptual framework that merges the ‘ecosystem service cascade’ and ‘policy cycle’ models to reinforce the link between ecosystem service assessments and practical applications in urban policy and governance. Next, we illustrate the applicability of the proposed framework along an example about conflicting interests on land use and green space planning following the closure of the Airport Tempelhof in Berlin, Germany. Our results highlight the scope of MCDA as a decision support tool for integrating ecosystem service assessments in green space governance. We discuss advantages and disadvantages of different methodological choices in the use of MCDA in ecosystem service assessments and note that a key strength of this tool in informing green space policies lies in its capacity to accommodate conflicting stakeholder perspectives and to address trade-offs between ecological, social and economic values.     

河堤环境效应略论

河流堤防的初始环境效应主要是防止河水泛滥和与河川争地。其派生的主要环境效应有:抬高水位,增大流速;延迟或堵塞支流汇水;造成水资源的浪费和短缺;中断土地肥力的自然培育过程;破坏土壤表层盐分的自然洗涤机制;加速土地沙化进程;改变流域结构,破坏河流环境生态功能。为防止河水泛滥并侵占河流的生存空间而修筑堤防,却引起了环境质量下降甚至导致环境恶化,人类应从中汲取沉痛的教训。