Ung dung GIS va VT nghien cuu sat lo dat tai VQGPNKB

KY YEU HQI THAo KHOA HQC GIS TRlfONG lrNG Dl)NG GIS vA VI~N THAM NGHIEN ClrU s~ T La aAT D~I HQC QUY NHON T~I VU'ON QUOC GIA PHONG NHA KE SANG Trftn Xuan MiJi, VO Van Tri Ban quan If VuOn qu6c gia Phong Nha - Ke Bang ABSTRACT Application of remote sensing and geographic information system study on landslide in Phong Nha - Ke Bang national park ! I !I Landslides are one of the natural hazards that have a great impact on the nature and socioeconomicactivities of people Phong Nha - Ke Bang is characterized by steep terrain, divided by river system,heavy rainfall As a result, there is a high risk of landslides, especially mountainous areas with lowvegetation coverage and along the Ho Chi Minh branches West and East highway, 20 road The landslidestudy to develop scenarios to cope with natural disasters is a solution for improving the capacityof management of resources In this study, the input data included: remote sensing data fLandsat,Spot, DEM), terrain map, slope, gradient direction, river density, hydrology, soil type, use mapSoil, vegetation cover, erosion points and other information maps Each layer of data is assigned Il weight corresponding to their importance during landslide A landslide analysis model was built basedon the ArcGIS software tool based on the combined results of all the above thematic classes and theweights of each factor that produced landslide risk prediction maps Classified by levels: very kigh, high, medium, low and very low Research results show that areas with high and very high :tJnds/ideare distributed in areas with unstable geological structure, loose soil, easily weathered, dynamicsof traffic works Research results help to avoid the consequences of landslide caused, the basis/orinfrastructure planning Keyword: Landslide, disaster, Phong Nha - Ke Bang LD~TVANDE '( Thu~t ngil s~t 16,d~t (Landslide), d~ chi S\l'chuy~n d(>~g cua d~t da tr~n mtit hay gAn mtit d~t XUong phia duo; suOn doc, dong thai de chi ban than cac the truqt S~t 16 dat 1611him dich chuyen hangtram ngan met kh6i v~t li~u, tieu huy cac trung tam dinh cu 1611,him bi~n d6i m~nh ccinh quan va Il';-'!lg 1~6ithUy van [4] Cac nguyen nhan tv nhien tac d(>ng d~n truqt 16 d~t nhu tac d(>ng cua cac tr~ d9ngltat, mua bao, cac ho~t d(>ng ki~n t~o dia m~o ~o nen cac dm gay cho khu V1,I'Cs~t 16, cac nguyap ~an ~ t~ - xa hQi nhu cac ho~t d(>ng nong nghi~p, pM rimg him nuang r~y ~o nen c~c khu ~c dattrong doi trQc, bat taluy xay dung cac cong trinh dUOng giao thOng, hIm tang them d(>doc cho ;] kIm V1,rcd6i nlii ding la nguyen nhan lam gia tang kha nang s~t 16 d~t tren nhiing tuy~n du6ng Vi~t Nam la m(>tqudc gia n~m khu V1,I'C co Mu nhi~t do; frm, luqng mua 1611va co S\1' ro r~t Ben c~nh do, vo; dtic di~m dia hlnh co to; 3/4 di~n tich la d6i nui nen ~ang xuyen chiu nhi~u thien tai anh huang cua tv nhien Cac thien tai rna hang nam Vi~t Nam ~,~~ thuOn~xuye~ hUng chiu nhu: ,Mo, Iii !1,1tva di k~m vo; ~a s~~I~ d~t }lui ~a ~.a~ th\l'c ,xoi 16,b