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Dynamicbidirectionalcouplingofsurfacehydrologicaland
2Dhydrodynamicmodelsbasedonmulti - gridtechnique
SHENYanxia,ZHOUQi,DUANYanhua,JIANGChunbo
(StateKeyLaboratoryofHydroscienceandEngineering,DepartmentofHydraulicEngineering,
TsinghuaUniversity,Beijing 100084,China)
Abstract:Aimingatimprovingthecomputationalefficiencywithoutaccuracylossesforfloodsimulationinwater
shed ,adynamicbidirectionalcoupledsurfacehydrologicaland2D hydrodynamicmodelsbasedonmulti - grid
(M- DBCM)isproposedinthisstudy.The2Dnonlinearreservoirmethodisadoptedinsurfacehydrologicalmodel
tosimulatetherainfall - runoff ,whereasthe2Dshallowwaterequationsareadoptedin2Dhydrodynamicmodelto
detailthefloodprocess.Thecomputationaldomainisdividedintogridswithdifferentsizes.Thesurfacehydrologi
calmodelisusedtosimulatetherainfall - runoffoncoarsegrids ,whereasthedynamicbidirectionalcoupledsurface
hydrologicaland2Dhydrodynamicmodelsisusedtodetailthefloodprocessonfinegrids.Acouplingmovinginter
face(CMI)isdevelopedtocouplethesurfacehydrologicaland2Dhydrodynamicmodels.Themassandmomentum
conservationthroughtheCMIcanbeensuredtoimprovethesimulationaccuracy.Differenttimestepsareadopted
incoarseandfinegridstofurtherimprovecomputationalefficiency.Twotestcasesareemployedtodemonstratethe
performanceoftheproposedmodel.TheresultsshowthattheproposedM- DBCMhashighcomputationalefficiency
whilemaintainingsatisfactoryaccuracy.
Keywords:watershedfloodsimulation;multi - grid;dynamicbidirectionalcoupling;CMI;computationaleffi
ciency;simulationaccuracy
(责任编辑:韩 昆)
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