共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
针对苏州市农村中小河道污染日益严重的现状,采用不同生态修复技术进行水环境修复,通过分析修复后水体的水质指标及浮游生物量变化,得出不同修复技术的优缺点及其适用性。研究表明各生态修复技术能够一定程度改善水体水质,但均存在一些不足,难以满足当前河道水环境的修复需求。底泥疏浚能够改善水质指标,但水体中的浮游生物量大幅减少且恢复缓慢;生态护岸对于含氮量较高的河道修复效果较差;生态浮床对于含磷量较高的河道修复效果不佳。联合修复技术,如生态护岸/底泥疏浚、生态湿地/木桩/自然护坡、生态浮床/生态护岸能显著改善水体水质和水生态,以上研究对其他平原地区农村河道的修复具有重要的参考价值和指导作用。 相似文献
4.
5.
浙江省平原河道水环境整治的对策探讨 总被引:2,自引:0,他引:2
改善河道水环境是河道整治的重要内容。利用洪水、潮汐等水动力进行水体置换,截污、河道拓浚、引水冲污以及采用生态修复技术等综合措施是改善浙江平原河道水环境行之有效和现实的对策措施。 相似文献
6.
石玉琛 《水资源开发与管理》2018,(2):16-19
本文以建昌县河流作为研究对象,提出砌块护岸、底泥疏浚、生态湿地、生态浮床、生态护岸等多种修复技术,并通过室内试验,对浮游生物量、污染物的降解系数进行研究,分析不同生态修复技术的特点,为其他平原地区农村中小河道的生态治理提供技术支持和借鉴。 相似文献
7.
8.
结合在北京市朝阳区河道治理工作中的实践,对朝阳区改善河道水质、改变河道环境、恢复河道生态等多个涉及河道生态修复方面的工作进行了论述,并结合已经实施的工程,列举了实施工程案例,展现了朝阳区在河道生态修复工作中有益的尝试和探索。结合近年的工作,对河道治理、河道生态修复工作进行了深入的思考,指出了在河道治理、河道生态修复工作中存在的问题,如河道水质的问题、河道生态修复工程的误区、河道生态修复工程实施中存在的问题等,并针对这些问题进行了进一步的分析和论述,尝试性地提出解决这些问题的办法和途径,为今后朝阳区河道生态修复工作提供了良好的建议和意见。 相似文献
9.
10.
11.
河流生态修复的顶层设计思考 总被引:5,自引:0,他引:5
我国河流生态修复工作发展迅速,近年来已在全国范围内大力推行,但从宏观战略方面,仍然缺乏河流生态修复方面的专项顶层设计来指导具体工作。针对这一问题,本文通过文献梳理和分析,提出了河流生态修复顶层设计思路,包括生态现状评价与胁迫因子识别、生态修复基点和修复目标确定、生态修复规划制定、生态修复措施实施、修复后适宜性管理与技术推广等关键技术流程,并结合国内外研究成果和实践经验详细阐述了其中的技术要点和实施建议。该成果可为今后河流生态修复规划、修复工程实践以及修复后管理等工作提供理论指导和参考借鉴。 相似文献
12.
This paper provides data on the changing character of river restoration within one country within a single policy and legislative framework. The information gathered was based on web searches, meetings and questionnaire responses with organizations and individuals working as environmental policy developers, stakeholders and practitioners of catchment management and river restoration. The paper utilizes this information to explore generic issues promoting and constraining a move to integrated catchment scale river restoration. Catchment scale river restoration was defined as ‘any river restoration activity that singly, or in combination, restores natural catchment processes and a naturally functioning ecosystem and brings benefit or environmental services to the whole catchment and not just to the site of restoration’. The river restoration project data compiled showed that the number of projects in Scotland is on a strong upward trajectory, but the number of catchment scale projects is still limited. The data also showed a trend towards a range of underpinning reasons for river restoration. Traditionally the reasons for river restoration in Scotland have been strongly fisheries focussed, with another key driver being biodiversity conservation. Sustainable flood management and climate change adaptation are seen as emerging drivers of river restoration. In terms of the individuals interviewed, most appreciated that river restoration can bring about multiple benefits and should be underpinned by a good understanding of catchment processes. Our overall assertion based on our study is that unless there is a fundamental paradigm shift, a change in the nature and level of funding for river restoration and a single organization is given overall authority to direct river restoration. ‘business as usual’ will continue and the benefits of catchment scale river restoration will be limited. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
13.
天津滨海新区湿地生态恢复模式 总被引:1,自引:1,他引:1
受人类频繁活动的影响,天津滨海新区湿地已遭受严重破坏,亟需开展湿地生态恢复的研究与实践工作。在分析湿地生态恢复内涵的基础上,提出了包括蓄水型湿地和溪流型湿地两大类型的14种湿地生态恢复模式,分析了各种恢复模式的恢复目标、适用范围、具体的恢复技术,并根据天津滨海新区各湿地类型生物和水文等不同特征提出了湿地生态恢复的技术方案。 相似文献
14.
丹江流域过去几十年里采用了生态、工程、生态与工程相结合、生态移民4种模式对流域生态进行了修复。为了进一步完善丹江流域生态修复模式,建立了生态修复评价指标体系,采用层次分析法和模糊综合评判法对丹江流域生态修复的综合效果进行了评价。丹江流域生态修复评价结果为良好。经分析发现,丹江流域生态修复中植物措施的主导地位没有得到充分体现,而工程措施比较多,今后,应以自然修复模式为主,人为工程修复模式为辅。 相似文献
15.
S. A. Peterson R. M. Hughes D. P. Larsen S. G. Paulsen J. M. Omernik 《Lakes & Reservoirs: Research and Management》1995,1(3):163-167
Understanding regional lake quality patterns is important to lake restoration. It puts specific lake conditions into perspective, provides a basis for establishing lake quality goals, identifies lakes most likely to benefit from restoration and forms a framework for assessing restoration success. We describe two techniques used to characterize regional lake quality patterns. Combining the two approaches provides an effective means to describe lake regions, management goals and restoration success. Case examples illustrate the significance of regional lake quality to specific lake restoration projects. 相似文献
16.
17.
任贺靖 《水科学与工程技术》2012,(2):26-28
随着经济、生活水平的提高,人们对城市河道整治提出新的要求.综合分析城市河道整治的控制要素,同时在分析硬质护岸结构型式及其影响的基础上,明确生态型护岸的内涵;在充分吸收国内、外河道整治及生态修复方面经验的基础上,探讨生态型护岸结构型式. 相似文献
18.
人类对河流的破坏导致了河流健康状况受损.针对河流健康出现的不同问题,人们采取了不同的修复方法,主要包括水文特征的修复、水环境质量的修复、结构形态的修复和种群结构的修复4个方面.水文特征的修复是恢复由于水利工程的建设造成的河流水文模式的改变,改善下游生态和环境条件,主要采取调节水利工程的运行调度方式.水环境质量的修复方法较多,包括物理修复、化学修复和生物修复.河流结构形态的修复是要尽可能恢复河流的纵向连续性和横向连通性,保持河流纵向和横向形态的多样性,防止河床材料的硬质化等,目前主要是采用近自然生态工法.种群结构的修复主要是采用各种生物技术.对于特定的河流,应具体分析河流健康的受损方面和受损程度,然后根据河流所处的状态因地制宜地选择合理、有效的修复方法. 相似文献
19.
20.
The River2D two‐dimensional hydraulic and habitat model was used to simulate fall‐run Chinook salmon (Oncorhynchus tschawytscha) spawning and fry and juvenile rearing habitat of the first phase of a stream channel restoration project on Clear Creek, California. Habitat was simulated for a range of stream flows: (1) before restoration; (2) based on the restoration design; (3) immediately after restoration; and (4) after one and two large flow events. Hydraulic and structural data were collected for three sites before restoration, and prerestoration habitat was simulated. Habitat simulated for these sites was extrapolated to the prerestoration area based on habitat mapping. The topographical plan for the restoration was used to simulate the anticipated habitat after restoration. Although the restoration increased spawning habitat, it was less successful for rearing habitat. Channel changes associated with high‐flow events did not entirely negate the benefits of the restoration project. The results of this study point out the need for models that can simulate the changes in channel topography associated with high‐flow events, which could then be used to simulate habitat over time. Published 2013. This article is a U.S. Government work and is in the public domain in the USA. 相似文献