大型沉管管节浮运航道适航特性建模分析.docx

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大型沉管管节浮运航道适航特性建模分析

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陈宏伟朱峰

摘要：为确保沉管隧道在航道中长期浮运作业的安全性与可靠性，依托深中通道工程备选预制厂方案，建立珠江口局部区域二维水流数学模型，在实测水文资料验证的基础上，通过模型计算揭示了浮运航道的水动力变化特征，开展航道范围内横流、纵流的变化特点分析。分析结果表明：工程实施后，龙穴港池水域的潮流流速普遍较弱，南沙四期港池水域流速变化较小，口门区水域环流较弱，为南沙港池作为防台锚地提供有利条件;浮运航道在小潮和中潮期间的最大横流可以近似认为不超过0.5m/s;小潮和中潮期间的最大纵流不超过1.0m/s，可以满足通航对水流条件的要求。但是大潮期间水流条件不满足浮运对水流流速的要求。研究结果可以为沉管浇筑区选址和浮运航道选线提供重要的参考依据和技术支撑。

关键词：航道工程;浮运航道;水流流态;流速分布;数值模拟

：U612.33：ADOI：10.7535/hbgykj.2021yx04011

Modelingandanalysisofnavigablecharacteristicsof

largeimmersedtubeelementsoffloatingchannel

CHENHongwei1，ZHUFeng2

（1.GuangzhouPortCompanyLimited，Guangzhou，Guangdong510100，China;2.CCCCFHDIEngineeringCompanyLimited，Guangzhou，Guangdong510230，China）

Abstract：Inordertoensurethesafetyandreliabilityoflongtermfloatingoperationofimmersedtunnelinthechannel，the2DmathematicalmodeloftheflowinPearlRiverestuarywasestablishedbasedonthealternativeprefabricationplantschemeoftheShenzhenZhongshanrivercrossingchannelproject.Onthebasisoftheverificationofmeasuredhydrologicaldata，thehydrodynamicvariationcharacteristicsoffloatingchannelwererevealedthroughmodelcalculation，andthecharacteristicsofcrossflowandlongitudinalflowchangewithinthechannelwereanalyzed.Theresultsshowthataftertheimplementationoftheproject，thetidalcurrentvelocityinLongxueharborbasinisgenerallyweak，thechangeofcurrentvelocityinNanshaphaseⅣharborbasinissmall，andthecirculationinthemouthareaisweak，whichcanprovidefavorableconditionsfortyphoonpreventionanchorage;themaximumcrosscurrentoffloatingchannelislessthan0.5m/sduringneapandmiddletide;themaximumlongitudinalcurrentvelocityintheperiodofneaptideandmidtideislessthan1.0m/s，whichcanmeettherequirementsoffloatingtransportation.However，thecurrentconditionsduringspringtidecannotmeettherequirementsoffloatingtransportation.Theresearchresultsca