基于GIS的青弋江特大桥防洪评价
2017-07-10杨润江米鸿燕曹帅帅
杨润江 米鸿燕 曹帅帅
摘要 由于经济发展的需要,在芜湖县红杨镇方山村上街附近拟建青弋江特大桥。按照设计方案,根据桥梁对河道防洪安全的影响,进行防洪评价计算。通過水文分析计算、冲刷与淤积分析计算以及岸堤的稳定性分析计算等,分析工程项目对河道的行洪、河势的稳定、防汛抢险工作、堤防安全、周边环境以及河道通航能力的影响,并提出防治与补救措施,包括对河道行洪能力的补救措施,河道岸坡影响的防治措施以及对防洪大堤影响的防治措施等。
关键词 地理信息系统;青弋江特大桥;防洪评价;行洪安全
中图分类号 S2 文献标识码 A 文章编号 0517-6611(2017)01-0200-03
Flood Control Evaluation of Qingyijiang Grand Bridge Based on GIS
YANG Runjiang, MI Hongyan, CAO Shuaishuai
(Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093)
Abstract Qingyijiang grand bridge was planned to be built nearby Shangjie Street, Fangshan Village, Hongyang Town, Wuhu County. According to the design scheme and influence of bridge on flood control, the ability of flood control of the bridge was calculated. Through hydrological analysis and calculation, scour and deposition analysis, embankment stability calculation, effects of the project on flood carrying capacity, stability of river regime, emergency protection in flood defense, embankment safety, surrounding environment and river navigation ability were studied. Prevention and remedial measures were proposed, including remedial measures of flood carrying capacity, river slope impact mitigation measures, as well as control measures of flood control embankment.
Key words GIS;Qingyijiang grand bridge;Evaluation of flood control;Flood safety
近年来,随着国家整体经济的持续发展,国家对基础设施的投入逐年增大,交通路网日趋完善,跨河桥梁建设日益增多。河道管理范围内日益增多的跨河桥梁对促进交通运输、社会经济发展等多方面发挥着重要的作用,但同时也对河道行洪、河势稳定、河道管理等产生了不利影响。在河道上修建跨河建筑物,直接影响到河道的行洪安全以及建筑物本身的稳定安全,因此,对跨河建筑物项目进行防洪影响评价十分重要。
在芜湖县境内新建的青弋江特大桥占用了河道,近堤桥墩的布设对堤防安全有不利影响,应对影响范围内的堤防及近堤桥墩周边进行防渗处理,确保堤防安全。河道内桥墩侵占了行洪断面,对河道行洪有一定影响,应对桥梁雍水影响河段进行行洪断面补偿,并根据河道行洪断面补偿方案,复核、调整桥墩和承台设计,桥墩承台顶高程不得高于实施断面补偿工程后的河底线高程。……
