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三峡工程蓄水运用以来荆江河段河岸稳定性初步研究   总被引:2,自引:0,他引:2  
根据实测资料分析了三峡工程蓄水运用以来荆江河段水沙输移变化,河道冲淤变化以及典型险工段近岸坡度变化等,并在此基础上对其河岸稳定性进行了初步研究,结果表明,三峡水库蓄水运用以来,坝下游河段来沙量大幅度减少,荆江河段普遍发生冲刷,部分地段近岸河床的水下岸坡冲刷变陡,河岸稳定出现了不同程度的隐患,局部河段甚至发生了崩岸险情,已影响防洪安全与河势稳定等;建议加强荆江险工段的监测,对已发生的崩岸险情进行及时治理,对以往护岸工程的薄弱地段或可能发生崩岸险情的地段需及时加固守护;建议加强三峡工程运用后荆江河道演变与治理方面的研究.  相似文献
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This paper presents major findings from a recent study aiming to systematically determine suitable river sections for local domestic water supply along the Yangtze River in Jiangsu Province, China. On the basis of analysis on the current riverbank utilization and bank stability, accessible and stable river sections in the region were selected. The water quality in these river sections was then studied using a two-dimensional unsteady flow and pollutant transport/transformation model, RBFVM-2D. The model was calibrated and verified against the hydrodynamic data, water quality data and remote sensing data collected from the river. The investigation on the pollution sources along the river identified 56 main pollution point sources. The pollution zones downstream of these point sources are the main threat for the water quality in the river. The model was used to compute the pollution zones. In particular, simulations were conducted to establish the relationship between the extent of the pollution zone and the wastewater discharge rate of the associated point source. These water quality simulation results were combined with the riverbank stability analysis to determine suitable river sections for local domestic water supply.  相似文献
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 以长江中游荆江出口熊家洲至城陵矶段典型断面为例,利用河岸稳定性与坡脚侵蚀模型(BSTEM)计算了2个典型断面在不同自然条件下的岸坡形态、水位条件、坡脚横向冲刷距离、植被类型及有护岸工程条件下河岸稳定的安全系数,分析了这些因素对河道岸坡稳定性的影响。结论表明:水位变化对河岸稳定性有重要影响,高、低水位岸坡稳定性与河岸组成密切相关,退水速率较快时,安全系数大幅度减小,易引起崩岸的发生;不同岸坡形态下河岸安全系数也不同,均随着坡脚横向冲刷距离的增大而减小;坡面实施护岸工程与植被覆盖会增加岸坡的稳定性。  相似文献
4.
结合前人的研究成果、相关最新统计资料以及有关专家的意见综合衡量,通过实地调查和论证,基于水源地岸线适宜性分析的目的,选择确定了岸线稳定性、岸前水深、流速、岸线利用情况等4大判定因素,制定了岸线评价的基本程序和主要步骤。通过运用GIS、统计分析、综合分析等定量、定性方法,完成了研究区域4大因素的评价。基于简化的层次分析法(AHP法),对长江南京段岸线进行水源地适宜性评价,给出了初步的定量评价结果。  相似文献
5.
River managers involved in riverbank protection need plant‐selection guidelines based on the biogeographical and ecological requirements of a wide variety of plant species. In this study, we propose a double typology of the woody plant species used in riverbank protection bioengineering in Europe based on ecological and biogeographical features. The statistical analyses of existing data highlight the important role played by waterlogging tolerance, soil moisture, soil productivity and light exposure in species classification, whereas acidity was less selective. Ninety‐five species were classified in 11 ecological groups according to the six ecological variables. Based on three biogeographical variables (altitude, continentality and geographic distribution), a second classification gave five biogeographical groups clustering species according to their geographic preferences. Independent biogeographical and ecological typologies allow river managers to be consistent with the regional altitudinal and climatic environment and to select species adapted to the local environmental conditions of the riverbank considered. This study is of particular interest because its methodology and results are applicable to slope protection in general as well as to potential changes resulting from climate change. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献
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