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4022007(161)NORTHWESTERNGEOLOGYVol.40No.22007(Sum161):100926248(2007)0220029227,,,,,,,(,710054):,,8;,;;;;,:;;;:P694:A2080,150,1999(),,,,,,,,(150000)(,2006),20053,,(,2004),,,1,,,:2006206210;:2007206212::(121201054110623);:(2006BAC04B05);:(1212010740907):(19622),,,,:710054,438,;:029287821980;E2mail:xazmaosheng@cgs1gov1cn,,36113702,1091411007,96km,76km,3556km2,8001400m,,,,,7oC,550mm119,621,3,20,755200439104,20199,18105,,,,,,,2001,,,,(,2004),,:Spot53600km2;QuickBird225km2,1018;:4,4,,3556km2,11155km2,15879km2,151425km2,1101097km2428,293,52,51,32:30,,24315m32,,,;,,(1),,,211,,,(2),,,,1,Spot5QuickBirdQuick2Bird,225km2,Spot5,3600km2,,,111515110,,22,1018,,726,77,(),100%,95%;(),90%,85%;(),,,65%,,03NORTHWESTERNGEOLOGY20071Fig11Technicalframeworkofdetailedgeologicalhazardsurvey132:2()Fig1232Dremotesensingimageinterpretationforgeologicalhazard1Tab11CurrentlyincommonusesystemofremotesensingtechnologyLandsat45(TM)Landsat7(ETM+)Spot()Spot()QuickBirdCBERS21(nm)4502350,1050125004502350,520900500890510730450900450730,630890,500125007831411(km)18517060601615113,890,120(m)30,12030,15,60102150161,21441915,256,7718156(d)161659591626,,15(Spot5)11(QuickBird),,,,20,212,,4,111515110,,23NORTHWESTERNGEOLOGY2007212111115,1515,,,1033196km2;1111,,225km22121215110,15;,,,,11015,,,60%,11021321311,,,,,,,,,,,Spot5QuickBird,,,,,,21312,,,,,;,,428,293,52,51,3221313,,,150012000,12501100030,3,GPS;,GPS;,GPS1321314,,214,,21411()332:,;,,;,21412;,,,,21413,,,,215,,,;,,,;,,3:,;;,,7,14,41;;;,311(,2001),2935251,31111(1),,,,,293(2)345,1514%;228,7210%;37,1216%(3),,264,9011%29,27,912%,2,017%(4)3185,6311%;105,3518%;3,110%,(5),206,7013%;47,1610%;40,1317%(6)3,,,155,5219%90,43NORTHWESTERNGEOLOGY20073017%,48,1614%(7)2430,10123%;,225,7618%;,4,1137%,34,1116%(8),,,,,,,,31112(1)49,94123%,3,5176%(2)326,5010%;20,3815%;6,1115%(3)5,1,2,22,4213%;14,2619%;13,,,2510%,31113(1)+351,43,8413%,6,1118%,+2,319%(2)5128,5419%;23,4511%(3),34,516617%,17,3313%312,,:,;,;;,;(,2006)31211(1),,,,,6090,,,,40500m,90250m401000m,60%100300mLB(3):B=1107L+60:R=0167230m,215m,019104715104m2,11810411215104m3(2),532:3Fig13Therelationbetweenlengthandbreadthoflandslidebody5090,,,,,,,,,,,:,;,,,,;,,,,,,,,,(3):,,,,,,,,,,,1m,,,,13m,,,,,,,,,;;,,,:,,,,,,,,,20065,-,,1m,015m,,,,,,,,,115m(4):,,,,,:,,,,,3,,,,,,,,:,63NORTHWESTERNGEOLOGY2007,,,,,,,(5),,,30,128m,35m,7116m,,,,31212(1),,52,41,11,,;,,,,(2),,,,,200192004113,16,2,30(3),52,2,5011,,10501235m,850m,5070,71904,31213,,(1),3588,,6617%6180,9212%4080;45,(2),,,,,:,;(3),,,;,,,,,,,,,,,,(4)()2222231331311(,2006),:(1),310,25,,264,11,10(2),732:812%,1212%,2415%,5511%,3818%,51%,2%,2%3160,72140%,70,54190%(3)10001300m,9401420m,90%10001300m,300m,50%10601180m,120m;50%,10601120m,60m,10501235m,850m,,(4)(5),60%,,,,1,2,,,(5),,1012%;7618%,;114%,;1116%,,,,,,,,;,,,(6),4,:01035456575160170,,0103545160170;6575101550556065,,,,7080130135160165,31312,,,,;,;,(1)293,45,1514%;,228,7210%;37(13,24),1215%,,,,,,,,,,,,,(2)20002004,,83NORTHWESTERNGEOLOGY2007,,1310,2,116,9,7(3)200020041316,,,69314,,,,,,,31411(,1998;NakamuraHiroyukietal1,1987),150m,,,,,,,,(1)4;4,4,293261(89108%),107,36152%;154,52156%52()37(71115%),21,40138%;16,30177%5131,60178%,24,40108%;7,20170%,,,,,;,,40m45,,,,,,,4460,,,(2)4,,3045,4Fig.4Distributionbetweenslopeoflandslidesandnumberoflandslides,932:15DEM,,56729225,,(5),(6),30,;3060,0104%,;60,0115%5Fig.5Distributionratiomapofdifferentrangeofgradientofslope6Fig.6Ratiomapoflandslideoccurringindifferentrangeofslope,,,(7),,,,,,,,,60,,750mFig.7Therelationbetweengradientandsaftyfactorof50m2highslope(3),,,,50120m1020m,69123%;2030m,17131%,,,;,,,,,(8),,2555,20120m;60,30m(9),,,04NORTHWESTERNGEOLOGY20078Fig.8Scattemapofslopegradientandheightonloesslandslide9Fig.9Therelationbetweengradientandsaftyfactoronfixedhighslope15DEM,,567292210m,112,(10),,,70m,0101%,100m,011%(11)(4)29312,,,,,,,10Fig.10Distributionratioofslopeindifferentrangeofslopeheight11Fig.11RatiooflandslidesoccurringindifferentrangeofslopeheightDEM,,45135225315,,,45135225315(13)045315360142:13Fig.13Distributionratioofslopeindifferentrangeofslopedirection12(0360)(090)Fig.12Scattermapofrelationamongloesslandslide,slopedirectionandslopeangle,,(14),,,,14Fig.14Ratiooflandslidesoccurringindifferentrangeofslopedirection31412,5kmökm2,3kmökm23:,,;:,;:,,,,231413(1),,,,,,,,,,24NORTHWESTERNGEOLOGY20072Tab12Comparisonoffeaturesofvalleysandgeo2hazardoccurence()(m)(m)(É)530600800200UJ2yT3w;,(Ê):;:2060100600100200UVJ2yT3wQp2;,,,(Ë),6010050VQp2;;,,,,,,,,(2)4:++++++,(,1999),31414(1),,,,,,,,,,,,,,,3:,,,:,,,,,,,:,,,,,,,,(2),,,,,,,3,,,342:,,,;,,,,,,,,,,,016,018,,,,,013,016,,,,293,,31415(1):,,,,,,,,,,(,1995),FLAC3D(,2003),,40m,3045(15),,,153045Fig.15Simulatingmapofstrengthreductionof30and45slope(2),,,,,,,,44NORTHWESTERNGEOLOGY2007,,,,,610,19866,,3519mm,2,,(,2000);1310,2,1;16,9,731531511,,(,1998),,(),,,,,,,(16)16Fig.16Indexsystemframeworkofdivisionalassessmentofgeo2hazardsusceptibilityintheBaotadistrict,7,,,(3)3Tab13Weightingfactorofassessmentindexforgeo2hazardsusceptibility012014011001050104010301050103011542:31512,,,,15DEM(F1C1Daietal1,2002;,2002),,