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ID:32208019
大小:3.91 MB
页数:68页
时间:2019-02-01
《叙渝段典型卵石急流滩整治技术的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要针对叙渝段典型卵石急滩(斗笠子滩和筲箕背滩)的水沙运动特点,收集已有的大量资料,开展现场调查,通过物理模型试验和概化水槽船模试验,对叙渝段卵石急滩的卵石运动规律、河床演变趋势、水力指标,碍航成因、整治原则、整治方法作了认真的研究和总结。卵石急滩的卵石运动规律为:卵石运动不是全河床分布,而是有明显的输沙带;不管洪水期还是中枯水期,对于卵石急滩主航槽来说,都是异岸输移;洪水期推移质输移路线经过主航槽,并产生一定淤积,枯水期水流归槽冲刷洪水期淤积的推移质;洪水期和枯水期的推移质输移路线方向不一样;卵
2、石运动强烈,斗笠子滩和筲箕背滩出现三维卵石沙波;卵石运动与年来水量关系较大。叙渝段卵石急滩目前按IⅡ级航道标准维护和整治,标准船队为881KW推轮顶2艘500t或l艘1000t驳组成的1000t级船队,其水力指标分别为:1%ox3.9m/s:2%ox3.5m/s和3%oX3.1m/s。通过物理模型试验研究,斗笠子滩的整治方案为:改建顺坝+主航槽炸礁两处+修筑岛尾坝。该方案实施后,通过实际船舶过滩能力调查分析,整治效果良好。泸渝段卵石急滩的整治原则为:整治后比降流速组合不超过泸渝段船舶上行允许比降、
3、流速标准;以调节滩段比降为主,方案后的比降调整到2.0%0以下为宜;整治后的流速不能太低,其流速要大于能冲刷洪水期淤积的推移质。泸渝段卵石急滩的整治方法为:正确选定通航汊道;在卵石滩上不宜布置疏浚方案;正确选定调整比降的方法;卵石急滩宜采取上疏下抬的方法。关键词:卵石急流滩;推移质输移;通航汊道;水力指标ABSTRACTAimatthemotioncharacteristicsofflowandsedimentinthetypicalgravelrapids(DouliziBeachandXiao
4、qibeiBeach)inXuyureach,authorsofthispaperstudyandsummarizethegravelmotion,thefluvialprocess,thehydraulicparameters,theformationcauseofnavigationobstacle,theprincipalsandmethodsofregulationbycollectingagreatamountoffielddata,performingthein—situsurvey,
5、carryingoutthephy’sicalmodelexperimentsandthegeneralshipmodelexperimentsintheflume.Themotionlawofthegravelbed—loadintherapidsisoutlined:thegravelmovesasanobvioustransportstripinsteadofdistributingthewholeriverbed.Wheneveritisthefloodseasonorminoranddr
6、yseason,thegraveltransportsontheotherbankinrelationtothemainnavigationchannelofgravelrapids.Duringthefloodseason,thebed-loadtransportsalongthemainnavigationchannelanddepositsoverthere,whiletheflowcomesbacktothemainchannelandscourthesedimentawayinthedr
7、yseason.Thedirectionofbed-loadtransportinthefloodseasonisdifferentfromthatinthed巧season.Whenthegravelbed-loadmovesintensely,thereappears3DgravelripplesinDoulizibeachandXiaoqibeiBeach.Thegravelbed-loadtransportisparticularlyaffectedbytheannualincomingw
8、ater.AtpresentthegravelrapidsinXuyureachWasregulatedandmaintainedbythenavigationchannelstandardIII,thestandardshipunitof1000tisallowedincluding2shipsof500tpushedbyapushertugof881KWoronebargeof1000t,andthehydraulicindicatoris1%ox3.9m/s,2%ox3.5m
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