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1.
    
Trees fall naturally into rivers generating flow heterogeneity, inducing geomorphological features, and creating habitats for biota. Wood is increasingly used in restoration projects and the potential of wood acting as leaky barriers to deliver natural flood management by ‘slowing the flow’ is recognised. However, wood in rivers can pose a risk to infrastructure and locally increase flood hazards. The aim of this paper is to provide an up‐to‐date summary of the benefits and risks associated with using wood to promote geomorphological processes to restore and manage rivers. This summary was developed through a workshop that brought together academics, river managers, restoration practitioners and consultants in the UK to share science and best practice on wood in rivers. A consensus was developed on four key issues: (i) hydrogeomorphological effects, (ii) current use in restoration and management, (iii) uncertainties and risks and (iv) tools and guidance required to inform process‐based restoration and management.  相似文献   

2.
    
The installation of large wood and sediment berms to narrow the overwide channel of the River Bulbourne, Hertfordshire, aimed to restore geomorphological processes, improve channel habitat diversity and increase the amenity value of the park in which the river is located. The Modular River Survey provides a framework and suite of tools for river managers and volunteers to monitor and assess restoration activities. Applying this technique to the River Bulbourne before and after restoration demonstrated that the works increased physical habitat and vegetation complexity. The restored section was narrowed, substrate composition changed and the range of in‐stream vegetation morphotypes increased. The initial slight improvement in riparian habitat complexity immediately following the restoration is expected to increase further over time as the riparian vegetation develops and the restored section of channel matures. A public perception and recreational use survey reviewed how visitor experience and use of the park changed following restoration.  相似文献   

3.
赵文斌  贺敏  万松 《风景园林》2021,28(S2):44-51
理水是以降雨及地貌特征为基础,通过模拟自然降雨径流过程,用基于自然的解决方案梳理水脉,管理水量、处理水质、调理生境,从而恢复自然水文循环,促进水生态系统健康,优化生命共同体各要素之间内在联系的水生态修复方法。广阳岛生态修复探索出以“雨水分析、径流模拟、滞留识别、冲突评定、径流重组、自然渗透、自然净化、自然积存、循环回用、场景呈现”共十大步骤为核心的理水方法与技术集成体系,旨在让每一滴雨水落地后,自然流淌到最适合的地方,呈现出山溪梯田、陂塘水田、小微湿地、生态湖塘等场景。  相似文献   

4.
木材的使用无处不在,体现了自然美。木材的概念分类俱多。中国传统建筑和木材息息相关。中国传统建筑的类型很多,木材在中国传统建筑中的应用广泛,首先是木材在中国传统建筑—宫殿中的应用与体现,其次是木材在中国传统建筑—坛庙中的应用与体现,再次是木材在中国传统建筑—民居中的应用与体现,最后是木材在中国传统建筑—古典园林中的应用与体现。木材对中国建筑的整体影响深远,无论科技怎样发展,木材仍然有着不可替代的作用。  相似文献   

5.
本文从海沧新城防洪规划,新城城市设计,内湖景观规划出发,通过对内湖排水计算,提出湖水调蓄方法,并强调内湖涵闸管理对内湖景观功能与防洪功能实现的重要性。  相似文献   

6.
采用自研足尺寸木质梁蠕变测试系统,对昆明室内自然环境下2种实木矩形梁和3种木工字梁进行了200 d蠕变测试,并分析其含水率与相对湿度的关系.结果表明:木质梁含水率的变化明显滞后于相对湿度的变化,且其在吸湿段的滞后大于解吸段;2种实木矩形梁和3种木工字梁在低湿波动、高湿波动、湿度持续波动上升和湿度持续波动下降这4类相对湿度典型变化时段的平均蠕变速率分别为8.839×10-2、1.183×10-2、-1.730×10-2/-3.598×10-2、7.424×10-2/9.007×10-2 mm/d,机械吸附蠕变特征明显;7条木质梁的FB90(加载90 d后蠕变挠度与加载1 min后蠕变挠度的比值)小于1.60,满足承重用梁的抗蠕变要求;实木矩形梁的抗蠕变性能优于木工字梁.  相似文献   

7.
我国城市雨洪管理及资源化利用研究   总被引:2,自引:0,他引:2  
中国城市雨洪管理的理念和技术相对落后,不符合现代城市雨洪综合利用和管理的新要求。德国、日本、美国、英国等国家在雨洪管理和资源化利用上取得了一些成效,他们的经验和方法对我们解决现实问题有很重要的借鉴意义。现代科学的城市雨洪管理应该以专项规划为引导,以先进的预报、模拟、监测、控制等技术为支撑。在提高城市综合管理水平的基础上,通过合理的生态工程,提高雨洪资源利用率,将城市生态系统保护、环境美化与雨洪的防、滞、排、用结合起来,促进生态文明和亲水宜居城市建设。  相似文献   

8.
通过对国内外矿山修复研究和现状进行总结与分析,归结了现阶段我国矿山修复的主要模式和存在的主要问题,指出发展理念、法规标准、主体责任划分的滞后影响了矿山修复的发展,在此基础上提出突出法制标准引导作用、加强政府主导作用、制定科学的治理方案的建议.  相似文献   

9.
李钰  郭新新  潘科 《消防科学与技术》2022,41(10):1405-1408
摘 要:超长海底隧道结构特殊,排烟补风成为制约超长海底隧道发展的关键因素。依托烟大海底隧道提出超长海底隧道无竖井排烟系统,并设计新型的海中无竖井排烟补风方案——采用离心式空气压缩机将火灾烟气高速加压后排到海水中,并通过压缩空气进行额外补风。采用FDS对不同排烟量和补风量下56组工况进行模拟,通过分析烟气层厚度、排烟效率和能见度,寻找最优的排烟补风方案。结果表明:排烟量在140~180,190~210 m3/s,补风量分别占排烟量的50%、70%时,系统排烟效果最优;其中,排烟量180 m3/s,补风量50%和排烟量200 m3/s,补风量70%情况下的排烟效果最优,且后者优于前者。实际工程应用中,可以考虑设计排烟量为200 m3/s,补风量为140 m3/s。  相似文献   

10.
    
This research evaluates performance of a rapid assessment framework for screening surface water flood risk in urban catchments. Recent advances in modelling have developed fast and computationally efficient cellular automata frameworks which demonstrate promising utility for increasing available evidence to support surface water management, however, questions remain regarding trade‐offs between accuracy and speed for practical application. This study evaluates performance of a rapid assessment framework by comparing results with outputs from an industry standard hydrodynamic model using a case study of St Neots in Cambridgeshire, UK. Results from the case study show that the rapid assessment framework is able to identify and prioritise areas of flood risk and outputs flood depths which correlate above 97% with the industry standard approach. In theory, this finding supports a simplified representation of catchments using cellular automata, and in practice presents an opportunity to apply the framework to develop evidence to support detailed modelling.  相似文献   

11.
大开口自然通风的流动机理与渗风模型有较大不同,通过对大开口自然通风伯努利方程的分析,探讨了空气流动的局部阻力机理,指出在大开口自然通风的流动过程中流量系数的物理含义及其应注意的问题.  相似文献   

12.
赵茜瑶  唐予晨  李慧 《中国园林》2022,38(6):103-108
在生态文明建设的大背景下,生态修复已经成为中国园林园艺类博览会的热点亮点,这对植物景观营建提出了新的要求和挑战。通过回顾我国综合性园林园艺类博览会在生态修复方面的探索,结合科学绿化的建设要求,提出生态修复背景下园林园艺类博览会中植物景观营建的目标需要综合生态、城市景观、城市事件的三重要求,遵循问题与目标导向相结合、人工修复和自然恢复相结合、景观塑造和群落营造相结合的工作要点。综合国内外相关植物景观营建实践,探讨在全园规划尺度、展园设计尺度和展后利用方面如何将生态修复和植物景观营建实践相结合,为今后园林园艺类博览会以及更大范围的风景园林生态修复实践提供参考。  相似文献   

13.
城市工业废弃地更新中自然景观的改造与再生   总被引:1,自引:0,他引:1  
指出工业废弃地景观更新已成为景观设计界关注的前沿性领域,在分析其发展和实践的基础上,对以土壤、植被、水系、地形为构成要素的自然景观进行论述,提出了具体的更新措施,即运用生态恢复技术及艺术设计手法进行改造与再生.  相似文献   

14.
Between 4 and 7 February 1990, exceptionally high river flows on the River Tay resulted in widespread flooding of land and property. Roads and railway lines were rendered impassable, and villages and farms were isolated for a prolonged period. In the Tay Valley, 42 km of flood banks were overtopped and 34 km2 of land were inundated.
This paper describes the extent and effects of the flooding and reviews the relevance of various factors in terms of their likely contribution to the magnitude of flooding. Flood-mitigation measures are discussed with particular attention being given to the implementation of a flood-warning system for the Tay Valley.  相似文献   

15.
Annually, rivers close to communities within Sekondi-Takoradi Metropolis overflow their banks, especially during the rainy seasons; displacing thousands of residents. Despite this, little is known about the coping strategies used by the residents when flooding occurs. Using mixed method, this article examines the coping strategies employed by households within three communities at risk. Two hundred and seven heads of households residing in Eshiem, Kansawurodo and Whindo were systematically selected to fill in questionnaires, while six key informants comprising chiefs and representatives of flood management institutions were chosen for in-depth interviews. The findings suggest that the commonest coping strategies adopted by residents in all the communities were: temporary vacation of homes, transfer of relevant properties to neighbors and building of flood steps. However, the coping strategies employed by the residents varied by communities, although the majority of them resorted to self-sustaining mechanisms in restoring their losses.  相似文献   

16.
This paper presents the results of an analysis aimed to assess the impact exerted on the flood regime of Lake Como and its emissary by different kinds of waterworks in the Adda basin (Italy). This includes construction of reservoirs in the Alps, increase in flow capacity of the exutory and regulation of Lake Como. The assessment of the management effect on peak floods is of particular interest as flood damages could be particularly heavy in densely populated areas along the lake banks and in the river flood plain downstream of the lake. The analysis is carried out by comparing the annual maxima of Lake Como levels and the river Adda discharges at Lecco, at the lake exutory, in different real and hypothetical situations. Both the construction of alpine reservoirs and the improvement of flow capacity of the exutory decrease lake levels and flood discharges, while lake regulation (for irrigation and power production) increases them. The overall effect is a generalised reduction of the flood levels and a slight increase in the discharges with return periods lower than 10 years. The discharges with higher return periods, instead, remain unchanged. The difference between peak and mean daily discharges negligible in all cases disappears altogether for return periods higher than 10 years.  相似文献   

17.
    
Urban forests provide essential functions in support of human communities; however, studies indicate adjacent residential land uses degrade urban forests following development. The resulting impacts are known as encroachment. Local Ontario governments rely primarily on passive management, such as boundary structures (e.g. fences) to limit this degradation but do not know whether they are effective for limiting the area of the forest floor covered by these impacts. Transect and quadrat sampling of 40 forest edges adjacent to 186 residential properties were sampled in six Southern Ontario municipalities to determine impact frequency and area cover of encroachment. The results indicated some structures are effective in reducing the frequency and area cover of some encroachment behaviours. Other behaviours were not significantly reduced by any structural treatment. Furthermore, some behaviours were increased by structures. Substantial areas of encroachment continued to occur under even the most effective boundary treatments. The treatment most successful in reducing frequency and area was ungated fencing in combination with a mown grass strip. It was found to reduce the incidence of yard extensions and concentrate encroachments closest to forest edges.  相似文献   

18.
根据景宁县城市建设和森林发展的特点,按照森林城市建设的要求,结合经济社会发展的现实需求,探讨景宁县森林城市建设:在分析现状的基础上,提出问题,确定理念,进行总体规划布局及重点建设工程的可实施性研究。  相似文献   

19.
通过对河南辉县百泉风景区人文景观和自然景观存在的若干问题进行研究分析,并提出相应的解决方案,期望能为之提供有意义、有价值的想法和思路。  相似文献   

20.
    
This paper presents a study of 10 English chalk streams in the River Thames Basin historically affected by abstraction of groundwater. Using macroinvertebrates, macrophytes and river discharge records from across 76 monitoring sites, and spanning the period 1992–2009 we assess how the communities change over time. River discharge is seen to be the most influential variable in biological community composition, and is used to calculate the annual average river discharge (in m3/s) needed to sustain different biological assemblages at each study site, from the lowest to the highest expression of fluvial aquatic community development. This represents a bottom‐up or site‐specific approach to the determination of ecological flow thresholds, from which more empirical trends may be inferred at regional level. The approach also provides a useful understanding of the timescales involved in the recovery of communities from drought.  相似文献   

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