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Surveyresearchoncharacteristicsofextremerainstorm floodanddisaster - causing
mechanism inurbannewdistrict:TakingZhengdongNewDistrictin
Zhengzhou’s“7.20”heavyrainstorm asanexample
1
1
1
3
2
LIUMingxiao,ZHUYongjie,HUHao,ZHANGHao,SUNDongpo
(1.PortChannelandOceanDevelopmentResearchCenter,NorthChinaUniversityofWaterResourcesand
ElectricPower ,Zhengzhou 450046,China;
2.YellowRiverConservancyTechnicalInstitute,Kaifeng 475004,China;
3.FacultyofAdvancedScienceandTechnology,KumamotoUniversity,Kumamoto 8608555,Japan)
Abstract:Inrecentyears,thepossibilityanduncertaintyofextremerainstormshaveincreasedintheworld,in
creasingtheriskofseverefloodsincities.Thecharacteristicsofurbanrainstorm floodaresignificantlydifferent
fromriverflood.Itisextremelyimportanttoinvestigateandcollectinformationofurbanrainstormforrecognizingits
characteristics.Inthispaper ,taking“7.20” heavyrainstorm inZhengzhouasanexample,basedonthegeo
graphicandsocialenvironmentcharacteristicsofZhengdongNewDistrict,theconvergingandsubmergingcharac
teristicsofurbanrainstormfloodandthedisaster - causingmechanismswereinvestigatedbymeansofsurvey ,oral
interview,dataanalysisandnumericalsimulation.Thecharacteristicsofurbanrainstorm floodmarks,andthe
basicmethodandroutineofrainstormfloodmarkssurveywereinvestigated.Basedonthe93floodmarksinthesur
veyarea ,theregionalsubmergencemapoftherainstormfloodwasfigured,andthedistributioncharacteristicsof
thepeakwaterlevelofurbanrainstorm floodandtheconfluencecharacteristicsinthesurveyareawereanalyzed.
Then ,themeasuringmethodoftheroadconfluencevelocityoftherainstormfloodandtheresistanceparameterof
theroadfordischargingfloodwereexplored.Theresultsshowthatthemaindischargingchannelofurbanrainstorm
floodistheroadoftheblock.Therefore ,theconfluencedirectionattributestothegeographicenvironmentandthe
layoutofroadnetwork.Thedistributionofsubmergingdepthofrainstormfloodisrelatedtotheunderlyingsurface
conditionandtheconfluencecharacteristicsofurbanrainstorm.Thedisaster - causingmechanismoftheurbanrain
stormfloodshowsthat ,theconvergingvolumeoftheextremelyrainstormisfarexceedthedischargingabilityofthe
undergroundpipelinenetwork.Thesurfacerunoffchoosestheroadwithlowresistantasthedischargingchannelof
therainstormflood,andtheflowvelocityofthefloodisalsoincreasedcomparingwiththenormalrainstormflood,
worseningthedisaster.Besides,thebackwaterandresistanceeffectaroundthejunctionsofthechannelswouldag
gravatethewaterlogging.That ’sthemainincentiveoftheextremelyrainstorm disaster - causing.Moreover,the
lackofcoordinationinflooddischargingabilitiesbetweenriverlakesystemsaswellandtheraredredgingworkof
theriverinthenewdevelopingcitydistrictleadstothefloodchannelobstructionoftheurbanriver.Therewould
turnupextremelyhighwaterlevel ,andthebackwaterintheintersectionofmainstreamandtributaries,decreasing
thecapacityofflooddischargingofthepipelineshighly.Thesearethedeterminereasonsoftheseverewaterlogging
disaster - causingoftheextremeurbanrainstormflood.Thefindingsoftheresearchmightsupplyvaluabletechnical
supportforestablishingstandardsurveymethodofurbanrainstormfloodanddesigningoffloodcontrolanddrainage
systeminnewdevelopingdistrict.
Keywords:heavyrainstorm;urbanrainstormflood;floodmarksofblock;roadroughness;river - lakeconnectivity
(责任编辑:耿庆斋)
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