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1,2(1.,400044;2.,400020)175m,,,,,,;;S11+3A0517-6611(2007)07-01984-02ApplicationofTwo-dimensionalWaterQualityModelinCalculationofPollutionZoneRENZhao-yangetal(UrbanConstructionandEnvironmentalEngineeringCollege,ChongqingUniversity,Chongqing400044)AbstractAfterwaterstoringofThreeGorgesReservoirwith175m,thewaterflowwillslowdown,andthedilutioncapacityofwaterwillbedecreasedsignificantly.Inordertomakethewaterinreservoirhavedomesticwater,industrialandagriculturalwatersupply,transportandothervisualfunctions,pollutionzonethatcausedbydiferrentpollutionsourcesisneededtoobserveindetails,whilethelengthofthepollutionzoneisthemostimportantparam-eters.Two-dimensionalwaterqualitymodeliseasytousewithhighaccuracy,canbeusedtocalculateandforecastthelengthofthepollutionzone,andisanimportanttoolofthewaterenvironmentprotection.KeywordsPollutionzone;Two-dimensionalwaterqualitymodel;Waterenvironment1175m657km,2m/s0.20.5m/s,1.1km,7m,;,,:5%[1],[2-3],,,,2,,,,,,,,2.1:Ct=Ex2Cx2+Ey2Cy2-uxCx-uyCy+S(x,y,C,t)(1):Cx,y(mg/L);ExEyxy(m/s);uxuyx,y(m2/s);S(x,y,C,t)[4](1)(1981-),,,,:2006-11-28QAuxky,[5](x,y),,(1):C(QA,k,y,ux)={C0+2QA(uxH4Eyx/ux)exp[-uxy2(4Eyx)]}exp(-kxux)(2),,(1):C(QA,k,y,ux)=[C0+QAuxH4Eyx/uxexp(-uxy24Eyx)]exp(-kxux)(3):Ey=yHgHI;C0(mg/L);H(m);g(m/s2);I()[6],QAkxux4f1(QA),f2(k),f3(y)f4(ux),CC:P(CC)=P[C(QA,k,,ux)C]=C(QA,k,,ux)Cf1(QA)f2(k)f3(y)f4(ux)dQAdkdaydux(4)(x,y),(2)(3)(4),QA,k,yux,(x,y)C[7],4,,2.2,3,;,JournalofAnhuiAgri.Sci.2007,35(7):1984-1985,2037,;3,,(2),2,,2B:C(QA,k,,ux)={C0+QAuxH4Eyx/ux[exp-uxy24Eyx+exp-ux(2B-Y)2(4Eyx)+exp-ux(2B+y)2(4Eyx)]}exp-kxux(5)33.1,,CS,I,II,,VCS(I),CS(II),,CS(V),[8][3]L,(L,0)CS,(2):C(QA,k,y,ux)={C0+2QAuxH4EyL/ux[exp-(ux02)(4EyL)]+exp-kLux=C0+QAuxHEyL/uxexp-kLux(6)(4):P(CS-CCS+)=p[CS-C(QA,k,,ux)Cs+]=CS-C(QA,K,,ux)CS+f1(QA)f2(k)f3(y)f4(ux)dQAdkdaydux(7),,y=0,(6)(7)CSx3.2,,,GB3838-2002:,.1[9],y=0,,300500m,1000m,,,(2):C(QA,K,y,ux)=C0+2QA(uxH4Eyx/ux)(8)1C(QA,K,y,ux)CS,:xb=1uxEy{QAH(CS-C0)}(9)(9)(IIIII)X2X3,,,=X2-X31:X2,IIX3,,,3.3(2),:QA=[C(QA,k,y,ux)expkxux-C0]HEyxuxexpuxy24Eyx(10),x=L,y=B,(7)(10)L,B4(1),,,,,,,,,(2),,,,,,(2037)5891357;,,;,3.3,,,,,,[4],,,3.4,3.4.1,,,[5],,,,;,3.4.2,,[5],,,,;,,,,,3.5,,,,,,()[6],,(),,3.6,,,,()(),,[7],,,[6]3.7,,,,,,,,[1],.[J].,2001,21(3):371-375.[2],.[J].:,2001,7(3):95-97.[3],,.[J].,2001,21(1):60-64.[4].[J].,2004,25(2):150-154.[5].[J].,2004,23(4):188-191.[6].[J].:,2003,26(1):71-74.[7].[J].:,1999(3):316-320.(1985)[1].[M].:,1987.[2],.[J].,1996,16(6):148-152.[3],.[J].,1999,2(2):32-34.[4].[M].:,1999.[5].[M].:,1996.[6],.[J].,2002,2(2):46-49.[7].[J].,1998,6(6):42-46.[8].[J].,1999,17(7):312-314.[9],,.[J].,2004,17(3):6-7.,30,,,34,1;1.1;1.1.1;1.1.1.17302357