Tap chi Khoa hpc va Cdng nghe biin T9 (2009) Sd 1 Tr 01 09 IMO HINH DANH GIA THIET HAI DO NGAP NtTOCl GAY RA BOI CAC LOAI SONG DAI (NLTOC DANG, SONG THAN) Kii2009 NGUYEN HONG LAN, NGUYEN NGOC TIEN Tor[.]
Tap chi Khoa hpc va Cdng nghe biin T9 (2009) Sd Tr 01 - 09 Kii2009 IMO HINH DANH GIA THIET HAI DO NGAP NtTOCl GAY RA BOI CAC LOAI SONG DAI (NLTOC DANG, SONG THAN) NGUYEN HONG LAN, NGUYEN NGOC TIEN Torn tat: Tliiet Piai ngap nuac gdy bdi cdc loai song ddi nine 'nudc ddng, song thdn doi vdi cdc viing ven bien la rdt ldn Bdi bdo dua mo hinh ddnh gid thiet hai dua tren cdc kich bdn ngap nudc song dai gay nin, sic dung cdc phuang phdp thong ke theo cdc so lieu da nghien ciru vd ngodi nudc Mo Idnh tinh todn duac time hien dua tren cong nghe GIS dua cdc ket qud ddnh gid budc ddu thiet hai cdc ITnh vice xdy dung, giao thong vci hg tdng ca sd I M(3 DAU Mot nhung dang thien tai tren bien gay cho nhung vung ven bd la su ngap nuoc, thiet hai chiing gay chiem tdi 40% tong so toan bo thiet hai noi chung thien tai tren bien Hien tuong ngap nude bien gay bdi nhung nguyen nhan khac d6 CO nguyen nhan nudc dang bao ldn gay tren bien va sdng than, gay chu yeu cac nguon dong dat xay tai day bien Viec du bao kip thdi va tinh toan vung ngap nuoc nhung nguyen nhan tren rat quan gop phan giam bot nhung thiet hai cho nhung vung ven bd, dong thoi cung la mot nhiem vu He thong quan ly tong the vung ven bd Viet Nam co hon 3000 km dudng bd bien va nam vung bien thudng xuyen xay cac bao Ion co nguon goc tu phi'a Tay Thai Binh Duong Cac bao sau vuot qua Philippin tien vao Bien Dong dugc cung cap them nang lugng bo sung manh len va cd xu hudng bg vao cac vung ven bien Viet Nam Ngoai tren Bien Ddng hoat dgng tich cue cua cac nguon dgng dat phfa Tay Bien Dong giap vdi Philippin nen nguy ca xay song than tac dgng den vung ven bien Viet Nam la cd nguy co xay Viec nghien cuu danh gia nguy hiem sdng than cung nhu tfnh toan truoc cac rui ro thiet hai gay sdng than gdp phan nang cao kha nang ung phd song than xay dong thdi lam giam nhe thiet hai gay sdng than ddi vdi cac khu thi, khu dan cu, khu cdng nghiep ven bien ^222 II MO HINH DANH GIA THIET HAI DO NGAP Nl/dC Quy trinh danh gia thiet hai ngap nudc ddi vdi cac vung ven bien cd the dugc trinh bay theo sa sau [4]: ^ I/' 'i'Ati'A: ID i thiet hai theo j \fVi-7/'i:-.,v I blot Ll^-Oin '"h"Jj);'i ixmv^ UOK-^ \Yi\Vf cong thiet hai, phi huy \,^i» •.0 Bao cao, hao \t\hk ii y :? Hinh 1: Sa danh gia thiet hai ngap nudc Mo hinh tinh sdng ban dau hinh dong dat: Md hinh dugc xay dimg dd dua danh gia v6 hinh dang, tfnh ch§t sdng hinh ban dSu dua theo cac tham sd kich ban cua mgt tran dgng dat ngoai biln sau xay dgng dSt [1] Sdng ban dSu dugc hinh cd cac tinh chat dac trung phufliugcvao ca chd hinh ddn^ dit ' • • ' ' • - - ' 'ã ã -s ã JitJ^~i-, t.>ôÊM^