VIEN DIA LY • VIEN KHOCN VIET MAM HO! DIA LY VIET NAM HIEN TRANG VA MOT SO BIEN FIIAP PHONG TRANH TAI BIEN LfJ LIJT, SAT LO DAT TREN LUU VlfC SONG LAi GIANG Nguyen Thi Huyin '''' SUMMARY The current tloo[.]
VIEN DIA LY • VIEN KHOCN VIET MAM HO! DIA LY VIET NAM HIEN TRANG VA MOT SO BIEN FIIAP PHONG TRANH TAI BIEN LfJ LIJT, SAT LO DAT TREN LUU VlfC SONG LAi GIANG Nguyen Thi Huyin ' SUMMARY The current tlood hazards, hindslide on the LaiGiang basin and some prevent measures Flood huzurds und lundslides in the Luigiung basin are natural hazards iJial occur popular nowaday Formed due to the impact of genercd natwully fuclors occur within the sume time (when the combination of the many weather types caused heavy rains that are an slope terrain areas beside M'ith surface buffer shortage ) and socioeconomic activities of humun cuiised the negative effect to the land surface in basin The natural huzurds huve left the serious loss not only economic but also to the people lives Therefore, It is neccessuiy to research andpructise measures to prevent and minimize the harm caused by them \ DAT VAN DE Trong viii thiip ky giin diiy, cac loai tai bien thien nhien nhu ddng dat, lii kit, hi quel, lii biin dii, sat Id, mdl gia tang, trd tliiinli nhung hiem liga khiic iighicl khdn liidng ddi vdi nhieu qudc gia tirii the gidi vii Viet Nam nude la, tai bien ki kit va sat Id dcil la nhung dang lai bien dien khii phd bien tren cac luu vuc sdng sudi, dac biet la cac luu vuc sdng sudi mien Trung, noi cd dja hinh bj chia cat manh, Idng sdng ngiin vii ddc, chju imli hudng Irii'c ticip ciia bao vii nhieu lac ddng ngii}' ciing tiing cua ngudi Ciic dang tai bien niiy khdng nhung dc lai ban qua nghiem trgng, tdn that to Idn ve ngudi, ciia cai mil cdn giiy miit dn djnh ve kinh te - xa bdi, anh hirdng den ddi sdng tinh than ciia ngudi diin km vuc Do viiy, da cd khii nhieu ciie cdng trinh tap trung phiiii tich ciic nguyen nhiin, co' die, liiiu qua vii dua dugc bien phiip tdi uu nham ban die, khiic phuc giiini thieu dugc ciic thiet liai ciic loai tai bien tren gay [1,2,4,7] Lai Giang la he thdng sdng Idn tliir hai (sau sdng Kdii) dtinli Binh Djnh Vdi ngudn tiii nguyen thien nliicSn phong plui va da dang, luu vuc sdng Lai cd vai trd riit quan trgng quii trinh phat trien kinh te - xii bdi ciia ca tinh Trong nhiing nam qua, cac tac dgng tieu cue ciia qua trinh phiit trien kinh te - xa hdi nhu khai thac va sir dung ngudn tai nguyen thien nhien khdng hgp li, chiit pha rirng, thai cdng nghiep, ciing he qua ciia tinh trang bien ddi liau dan den sir gia tiing ve ca quy md, cudng \ii tiin suiit cac loai tai bien thien nhien nlur 111 lilt, xdi mdn, sat Id bd sdng, tren be mat luu vuc Cac loai tai bien dii gay nhieu tdn that to Idn ve ngudi, tai san vii ciic cdng trinh, ciic co sd tiing khu vuc Do vay, nghien ciru hien trang tai bien In kit vii sat Id diit cd y ngliTa thuc lien cao, liini co' sd cho cac giai phiip plidng triinli vii giam nlie thiet hai GIOI THIEU TONG QUAN VE LUtI VlTC SONG LAI GIANG Dai hoc Quy Nhoii Hdi nghi Klioa hgc Dia ly Toan quoc idn thufS- HA Ngi, 2010 859 VIEN DIA LY - VIEN KHtfCN VIET NAM HOI I A LY VIET NAM Sdng Lai Giang, mdl he thdng sdng Idn ciia linh Binh l}inli cd dien tich luu \'Lrc khoang 1466 km2 (chicm 24.5% dat tu nhien ciia tinh) NTim a ria phia Ddnn ciia da\ Trudng Son sdng biit ngudn tir cac da\' niii cd dinh cao tir 900 din lOOOm" uoin nhanh sdng chinh lii An Liio \a Kim Son Llai nhanh sdng nil} hgp luu tai | ^i Khanh ddng chinh Lai Giang Luu \ uc l,ai Giang dugc hinh tren khdi niin" Kon i u m cau tao bdi cac da niacnia tram tich va bien chat tudi Paleozdi- Mezozdi, co chira nhieu siin phiini tram tich \a liin tich tudi De lii', gdm cac loai dk set, set pha, cat pha \a cudi soi Dja hinh luu \uc phiic tap va cd hudng nghieng tir Tiiv sang Ddno D6i niii chiem tren 80%, trai dai den tan bd bien, chia cat khu \ uc thap ciic canh don" thung king nho hep ven sdng Do cao trung binh ciia luu vuc la 277m, ddc binh qniin la 22% tii\ nhien dgc ciic trien mii ddc binh quan tdi 60-^80% Mat sdng sudi luu \ uc khii Idn (0.65 km/km") Phia thirgng n"udn Idn" sdng ddc khiic khuyu, gap gheiih va hep nhung den khu \ uc dong bSng sdng md rone lion (long sdng cd the rdng den viii iriini met) |3] Luu \u'c sdng Lai dugc gidi han boi tga dja MANG 1,1101 IlliV V.AN I.VV \ V'C l,,\l (;1ANC 14o 10" den 14o45' vTdd B3c 108o 30" din I09o 20" kinh Ddng + Phia Nam giap huyen Phii My, \di km vuc song La linh ' i\ V ^ Phia Biic giap tinh Quang Ngai vdi luu vuc sdng Vc + Phia Tay giap huyen VTnh Thanh vdi luu vuc sdng Kdn + Phia Ddng giap biln Ddng HIEN TRANG TAI BIEN LU LUT, SAT LO DAT TREN LUU VUC LAI GIANG VA MOT SO BIEN PHAP PHONG TRANH 3.L Tai bien lu lut • Che dd lu tren luu vuc Lgi Giang Qua nghien ciiu sd lieu quan trSe nhieu nam va quan sat thirc te, miia ki eiia km vuc song Lai Giang keo dai tii' thang X din thiing XII, nhien ca biet cd nhiing niim lu CO the xay tii' thang IX va keo dai din thang Lii xay vao thang IX din nira dSu thang X ggi la hi sdm Lii xay vao thang XII hoac thang I nam sau goi la lu mudn Lii lo-n nhat niim (In chinh vu) thudng xa>' N'ao thdi ky nua cudi tliano X vii thang XL - Lu som: Diic trung ciia hi sdm la ki nhd ki dan, thai gian ki nerm (khoang 1-3 ngay) xa luu lugng ki thudng khdng Idn miit dk vira trai qua thdi ky khd han, kha nang tham giu nuoc dat cao nuoc sdnsj cdn d miic tb§p Theo kit qua xir ly 860 Hoi ng-hi Khoa hgc Dia ly Toan quoc idn thit - Ha Ngi 2010 VIEN DIA LY • VIEN KHOCN VIET NAM HOI BIA LY VSET NAM thdng ke tir sd lieu cpian triic thuy vim tai tram An Hda thdi ky 1992 - 2005, (kn sual xuat hien ki sdm tren sdng Lai lii 1 % - Ld mudn: Tuong tir nhu ki sdm, ki mudn ciing cd km lugng, cudng va bien deu nhd Thai gian truyen ki cd the diii hon ki sdm mdl viii ngiiy vii thudng xay vao thiing XII hoac sang thiing nam sau Tuy nhien, theo thdng ke ddng cliay ki tai tram An I Ida, ddi vao thang XII o' luu vuc Lai Giang vim cd the xay nliiing Iran hi Idn Chang ban, triin ki xay vao ngiiy 3/12/1986, cd km lugng dugc 2l60m''/s va Iran lii ngiiy 3/12/1999 luu lugng dat tdi 3680 mVs Kha niing xuat hien hi Idn nhitl thai ky lii mudn ki 17% - Lu chiidi vu: Lii chinh vu thudng lii ki Idn nhiit nam Ddi vdi luu vuc L - 3m/s)[8] Luu tdc Idn da tao nen ddng cha\' ID manh cuon trdi nhieu vat can tren dudng di dd lu quet rat dl xav d viing ddi mii Thdi gian gan day, mua bao xa>' vdi quy md Idn va tan suat mot tang tren km \u'c sdng Lai nen lu lut cung thudng xuyen xuat bien vao cac nam 1999, 2000, 2002 2005 2007 2009 Lirgng mua Idn nhat cd the dat 600-700 mm/ngay (d An Lao) lam ngap lut vimg km sdng Lai Trong thdi gian nghien ciiu tu 1999 den tren km vuc sdng Lai Giang da xuat hien nhung tran lu Ijch sir dugc danh gia la nhiing triin ki Idn nhiit tir thap nien 80 tro lai day Cudng suiit lu len nhanh dinh nhgn muc nude da vugt miic bao ddng cap III tir 0,5in - 1,5m va tri vai ngiiy, gay anh hudng nghiem trgng den ddi sdng ciia dan cu luu vuc Bdng2: Bdng thong ke muc nir&c l&n nhdl vd tht)'i gian xuat hien lai tram An Hda vd Bong Son TT 01 02 03 04 05 06 07 08 09 10 Nam 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 H,n,x(m) 24.60 22.40 21.69 22.52 23.71 23.21 23.45 23.06 24.72 24.17 Tram An Hoa Thai gian xuat hien 3/12 3/11 18/10 24/10 14/10 22/11 21/10 10/11 3/11 5/11 H,„ax(m) 9.44 6.26 6.20 6.70 7.11 7.10 9.80 6.75 8.95 8.00 Tram Bong San Thdi gian xuiit hieii 3/12 18/11 21/10 3/11 11/11 13/11 15/12 3/11 9/11 3/11 ,\'gudn:Tning torn Klii tuong - TImy van TP Quy Mian Blnli IDinIt * Van de ngap lut tren hru vuc Lgi Giang Mua ki la nguyen nhan chii yeu gay ngap lijt d luu vuc Lai Giang Do dja hinh km \ lie ddc, Idng sdng ngan ddc, ciia An Du hep va ndng, lai cd doi cat nam ngang an ngu khdng thuan Igi cho tieu thoat nude Dong thdi, rirng d diiy bj tan pha manh (do khai thac, pha rirng lam ray), nen mua xuong vdi cudng Idn, thdi gian tap trung nude nhanh, cudng suat lu rk Idn, dong bSng hep, thap lai bi cac tuyin dudng giao thdng nhu dudng sat, dudng bd, dudng lien huyen, dudng lien xa ngiin each tao cac dai ngan, lam lu nit chain ga}' ngap kit sau va rdng khip tren nhilu khu vuc ciia hu.\en An Lao, Hoai An, Hoai Nhon Nhu vay, vao nhiing thdi ki ki Idn (chua kl din ki Idn nam 1999), hiui hit cac huyen km vuc Lai Giang dIu bi ngap tham chi cd noi ngap rat sau, muc nude ngap cao nhat cd the len din 4m (thdn My Due nam 1987) thdi gian ngap keo dai, cd noi den 10 (thdn Long My niim 1987) 862 Hoi nghi Khoa hgc Dia ly Toan quoc idn th-ct - Ha Ngi, 2010 VIEN DIA LY - VIEN KHtfCN VIE'«- HAM niii 33A LY V5ET NAM Vira qua ciic dgt lii 1999, 2002, 2009, cac huyen loan luu vuc dIu bj anh hudng Idn ngiip lut, giao thdng tai cac huyen gcin nhu bj chia ciit Cd nam d Huyen An Lao, dudng tinh Id bj ngap s;iu hon 2,5m, mot sd x?i bj ngap nang (.An Hda, An Tan, ) Huyen lloiii An (ciic xa ven ben trien sdng Kim Son) va An Liio (cac xa An Hien, An NghTa, An Tin, An My) bj iigiip lut nghiem trgng.diuyen Hoai Nhon doan giao Id 1A tir nam Ciiu Dgi den Dien Khimli (xii Lloiii Dire) va doan Ciroiig Hoii di I'ain Quan tren km dudng bj ngiip siiu hon Im liuii acli tiic giao thdng nhieu gid ii'ong nhieu nam cpia, nude ki Lai Giang dii cirdp di ciia ngudi dim tren Huyen Hoiii Nhon tren 10 becta diit Nam 2009, toan xii Hoai Dire bj mat trang khoiing 300 Ilia, 1.600 nhii dim bj ngiip, 70.000 m' hd nudi tdni bj pha buy liirn thiet hai udc linh 1.830 trieu ddng Ngoiii ra, d vimg thugng km sdng Lai thudng xuiit hien ki quel, giiy thiet hai ve n"Ud'i vii ciia Tai huyen An Lao, lii quel thudng xiuil hien viio tiet lieu man (thang V) va ciic tliimg X, XI, Xll liiiiig nam Vimg thudng bj ki quet la Van Xuan, Long Khimh Xuiin Phong (An Hda) Thuan An (An Tim), thdn 7,9 (An Trung) Niini lu Idn 1987, dien tich 1420 huyen bj ngiip keo diii I -10 3.2 Tai bien sat Id • Nguyen nhan sat la bd sdng Iren hru vuc Lui Giung Ciic bac them sdng Lai tir thugng ngudn den km dugc ciiu tao bdi ciic Idp diit yeu nhu Idp dat set pha hat nhd miiu xiim xanh, Idp diit cat man xam chat vira, Idp diit set pha hat nhd miiu xam xanh deo mem va Idp cat hat thd Ian sdi nlid Cac Idp dat mat cd trang thai vat ly kern, lire dinh kit nhd (trung binh C = 0,3 -0,32 kg/cm2), he sd rdng cao (e = 0,85- 0,95)[31, dl bj biln dang chju luc tac dung, diit kem chju nude, dc bj Xiim thuc ciia ddng chay phii luiy, dan den hien lugng khdi dat de miit on djnh Chi cd lire t;ic dgng nhc, ca khdi diit Idn cd the trugt xuong i'reii luu vuc sdng lai, ddi mii chiem den 80% dien tich, mat sdng sudi kha Idn (0.65 km/km2) Cd nhieu nhanli sdng nhd vii sudi theo ciic khe mii hep dd nude vao sdng chinh hinh mot mang ludi vdi riil nhieu nhanh cliiiy nhiing king hep giiia Ciic triin mii bj chia ciit nen de hinh tliimh ddng chay mat riil Idn cd mua Ddng chinh Lai Giang ngcin, quanh co uon khiic, hep vii ddc Khi cd hi, nude sdng dimg cao, chay xilt, cuon cuon xoiiy viio bd Idi di hang triim m3 diit, giiy hien lugng xdi, siit la bd siidt dgc theo sdng An Liio, Kim Son vii Lai Giang Ngoiii ciic ylu Id khiic nhu rirng bj tim phii nghiem trgng, hien che plui rirng tren luu vuc khii thcip va khdng ddng deu (32%), ddc sudn mii Ian (do ddc binh qiiiin diil tdi 60 - 80% ) nen dat tren vimg thugng ngudn de bj bdc mdn rua trdi nili cd mua Idn, hinh Ihimli ciic riinh, soi nude len Idi theo ciic vet mil hoac theo cdc dudng bj xdi mdn dl dd viio suoi Mdl sd nai cd dien tich himg mrde Idn, cua khoi thung king hep va ciiy coi o diiy bj triet nen de xiiy ki quel giiy hau qua nghiem trgng khu vuc • Hien trung Tren toiin bd luu virc Lai Giang dii xay khoang 58 diem s:it Id bd song vdi tdng chien dai sat la len din 19.745km va dien tich mat dat 187.35ha | | Nhu \:i\ tinh trung binh cir 2.7 km chilu diii Ciic sdng thi cd diem Siit lo vii tdng chieu diii Ciic doan sat la cliilm 20% tdng chieu dai cac sdng Chieu dai diem sat lo ngiin nhat khoang tren dudi 30ni chd diii nhat len den - km nhu o Ca Cong thugc husen Hoiii Hoi nghi Klioa hgc Dia ly Toan quoc idn Unto - Ha Ngi, 2010 S63 HOI DIA LY VIET NAM VIEN DW LY - VIEN KH«CN VIET NAM Nhon sat lo hon 3,5 km lam mat ]79.300nr dat Tdc sat Id trung binh tren km vuc la 0,5ni - ni nam Bdng 3: Hien trgng sat Id tren song Lgi Giang Pham vi sat Id Dia phuong HuN'en Song Thdn Ca Cong Thanh Xuan Phu An An Hiep Xa SONG LAI G I A N G HUYEN HOAI NHON Xa Hoai Huang Cong Luong KJianh Trach My Tho Lai Khanh Xa Hoai My chieu dai (m) chieu r6ng(in) 25000 20 500 100 1500 20 1000 150 300 20 300 2000 200 20 30 Xii Hoai Diic Binh Chung Dai Binh Khoi 1500 2000 1200 30 15 50 Thi Triin Bong San Phil Dire •1300 30 600 15 Thuan Thugng 800 35 VTnh Phung 1500 30 Trung Luong Xa Hoai Xuan Ngudn:l3j Hien tugng sat Id bd sdng da lam siit dd nhieu rugng vudn, hoa mau, diit dai san xuat va mat dn djnh khu dan cu Tai huyen Hoai Nhan: sat Id bd sdng d thdn Ca Cdng va Trudng Lam, xa Hoai Huong nam 1996 lam bang chuc ngdi nha bi sup dd, huge hau het dan cu thdn phai di ddi di noi khac, sat Id tai Cdng Luang uy hiep 36 hg dan Tai huyen An Lao: Thdn Phudc Binh bi sat Id vdi cbicu dai 1,5km va Id sau vao ddng rugng 15m, 52 hd diin bj uy hiep, d Xii An Trung d Thirgng luu can sdng V6 hien tugng sat Id bd gan nhu zk dirt dudng 529 Hien tugng sat Id bd sdng Lai Giang khdng nhiing lam mat dat canh tac, gay mat dn dinh khu dan cu ma hien tugng sat Id bd dii Ian den tan chan cac tuyen dudng old, ga\ nen sir mat dn djnh tiem an, rat nguy hiem cho cac tuyIn dudng, nhu cac khu vuc: Cam Dire, VTnh Dire, thugng luu cau sdng Vd, diu cku Van Trung (sdng An Lao), khu \u'c thugng luu cau Muc Kiln, khu virc Thi Thanh, khu vuc Lai Khanh (sdng Kim Son), khu vuc Bong Son, khu vuc Dinh Trj (xa Hoai My) Sat Id khu vuc thj Iran Bdng Son va nhieu thj Iran khac da anh hudng rat idn din dan cu khu vuc Ngoai ra, hien tugng sat Id ciia cira biln d day cung diin kha manh me Theo nghien ciru dau hieu sat Id ciia cira bien An Dii da xuat hien tir nhiing nam 70, caiig ve sau, tdc sat Id cang manh Tii' 1960 trd lai day, cua bien da md rdng khoang 300m (mdi ben bd khoang 150m), tir 1980 din nay, bd biln da Ian sau vao &k liln hon 100m Dac biet hinh dang ciia cira bien ludn biln ddi, cd xu hudng chuyin dan tii' phia Nam sang phia Bac Trudc diin biln ciia hau ngiiy cang phirc tap, toe tan suat sat lo se cd the dien manh me vii khd ludng ban Tuy nhien cho din cac giai phap ban che sat Id tai cira An Dii chi mang tinh chSt tam thdi nhu dimg bao cat dSp bd trdng phi lao giu dat, giir cat, di ddi cac hd^dan vimg sat la VAn dl "trj thuy" de bao ve bd sdng chdng xdi Id, giu on dinh cho ciia sdng mdi; phong chdng ki va lieu 664 Hgi ng-hi Klioa hgc Dia ly Toan quoc idn thii - Ha Ngi, 2010 VIEH DIA LY - VIEN K H O C H VIET HAM iiOl DIA LY VIET NAM llunit hi lot clio km vuc sdng Liii Giang chdng ngiip img keo diii cho ciic khu diin cw uong km vuc van cdn thieu nlui'iig cdng trinh mang linh dai lio'i vii ben vimg i.5 Mot sd giiii phap phong triiiih ilai dimg tai bien neu tren xiiy tren km vuc sdng Lai chju sir tac diing long hop cua Ciic dieu kien liiiu, dja hinh, dja cliiil lliii)' viln, thd iihudng vii Idp phu thuc viit ciing vdi hoiit ddng phtit trien kinh te xii hdi ciia ngudi Chiing da de kii nhung hau ciiiii riil nghiem trgng Do viiy de phong Iriinli va giiim thieu thiet liiii, ciin tliirc hien iiidt so Ciic giiii phiip sau: - Tiing cudng chirc niing ciia Idp plui thuc vat (nlur trdng rinig plidng hd diiii ngudn, biio ve rirng, hiiii che chiit plui rirng Lam nirong ray ) Tham rinig cd tiic dung dieu tiet dugc ddng chay mat, cd khii niing cd djnh dugc dat, dieu hda dugc nhiet iim diit iicMi cd the liiin che dugc hi kit, xdi mdn va siit Id diit Trong dieu kien ly Ic che plui trc;n luu vii'c Lai Giang cdn khii thap (32%)), nen diiy lii mdl bien pliaii kha thi an toiin vii kinh le iiliiil dieu tiet ddng chii), liiui die lu kit vii sat Id - riing cudng cbiic niing dieu tiet ddng chay ciia Idp vd phong hda - ihd iihudng: Luu vii'c sdng Lai Ciiang giiiu ciic loiii diit cd rdng Idn, nen kh^i niing tliiim riiidc tdt Tuy nhien, boat ddng ciia ngudi tren be mat luu vuc nhu khai thiic dat ddc liim nuong riiy, phii rirng, dap bd nudi trdng thiiy Siin, va cac quii trinh canh tac khiic dii liim liciii ehl khii niing vii vi pham himb lang thoiit ki ciia sdng Vi viiy, ciin phiii cd quy hoiicli cu thi Vii kicm soiit ebiil che mdl sd dang boat dgng kinh le cua diin cu, diic biet hi vice Xiiy dung cac iio nudi trdng thiiy siin kin chicm Idng sdng can trd thoiit ki, nhiim tiing cudng chuc nang dieu tiet ki vii giiim thieu thiet hai thicn tai giiy - Niing cao iiiing lire dir bao tugng thuy van, dd cd dii biio mua vii ddng chiiy - Xiiy dung ban ngiip kit vii ban canh biio thien tai, diic biet lii ki quet vii sat Id dat - Xiiy dung vii tdn liio liii he thong de dieu Nhieu doan de tren km vuc sdng Liii bj pha hiiy hoac xuong c5p miia ki, hien iiiiy chua diip irng dimg yeu ciiu ky lliuiit, nhung de xiiy du'iig tiiyin de vdi cao mat de Idn rat ton kem Viiy chi ciin thiet ke nluiiig tuyen de vdi cao dii chong lu nhd va vira nhung cd the an loan lu Idn trim qua - Ciin Ccii thien lai he thdng ho chira d thugng ngudn de dieu tiet ddng chay - Tao hanh king thoiil ki nlur nang cao kluiu ciiu, cdng thoiit ki, ddng thoi tao hanh lang thoat mrde cho Idng dim - Luu vuc Lai Giang bj doi Ciit Idn iin ngu cira An Dii, ban che kha nang thoiit hi ciia sdng, nen ck^ phai md kenh tlioiit IQ cho sdng Lai Ngoiii ra, can nghien ciru va cho phep khai thiic ciit d mot so doan bdi lap de khoi thdng ddng chiiy - Chii y din quy boiicli ciic khu dan cu, dac biet lii d nhiing khu vuc tning thap cd thi bj ngiip ling hoiie nhiing khu vuc hudng ddng chay lii cd the tran qua Ddng thdi, can niing ciio nhan thuc cho ngudi diin ve tai biln ki kit va thuc bien ciic bicii phiip phong Iriinh, giiim tbilu thiet hai ve ngudi va tai san KET LUAN Nhiin" niim gan diiy tren luu vuc Lai Giang Tinh Binh Djnh, tai bien ki Int sat Id bd sdriu, bd biln, ngiiy ciiiig gia tiing ve tiin suat liin cudng do su tac dgng cua Hgi nghi Klioa hgc Dia ly Toan quoc Idn th&o - Hd Ngi, 2010 865 VIEN DIA LY • VIEN KHKCN VIET NAM HOI DIA LY VIET NAM cac \ l u td ndi sinh ngoai sinh vii ciic boat ddng kinh te - xa hdi cang nhilu ciia "naudi tren bl mat luu vuc Lii tren luu vuc L^i Giang kha Idn va thudng xuyen Lii hinh tlianh su id hgp ciia Ciie loai hinh thdi tiet nhu bao, ap tbiip hgp vdi diii hdi tii nhiet ddi \a khdng lanh tren nen dia hinh ddc (sdng Lai ngiin, ddc, dia hinh nghieng) ciia biln An Dii hep ndng, cd doi cat nam ngang iin ngu khdng thuan Igi cho thoat nude Luu vuc sdng Lai Giang lai bj khai thac pha riing lam riiy kha manh vi vay mua xuong vdi cudng mua Idn, thdi gian tap trung nude rat nhanh, cudng suat lu rk Idn sons ddng b§ng hep, thap khii nang dan nude kem nen lu len nhanh sau mua, cudns suk Idn (thdi gian truyen ki tdi Bdng Son chi khoang 4-5h), tap trung ddn vao nhanh hep cua Lai Giang, muc nude diing rat cao gay bien tugng ngap kit rdng khSp tren toim \ iing km Dong thdi kit ciu diit d day cd rdng Idn lire ket dinh kem, de bj xam thuc ciia ddng chay pha hiiy, dan den hien tugng khdi dat de miit dn djnh gay hien tugng xdi bdi sat Id nuii bd sdng Hien na>', tai bien sat Id bd sdng, bd bien tren km vuc song Lai dien kha manh me vdi tdc Idn vii dien bien riit phiie tap (cd 58 diem sat Id bd sdng tren toan luu vuc) da de lai rat nhieu thiet hai ve mat kinh te dan sinh, kim ham sir phat trien KT- XH ciia khu vuc Do \'ay, de pbdng tranh \'a giam nhe ciic loai tai bien tren km virc sdng Lai, can phai xem xet va danh gia gia nguyen nhiin hinh tai bien tren quan diem he thong Ciic bien phap de khdng chi la bien phiip rieng le ma can phai cd mot quy hoach quan li theo tdng hgp luu vuc sdng tren co sd chien luge phat trien KT- XH ciia dja phirong Tir dd dua nhung quy hoach cu the cho tirng huyen tirng tirng xa phii hgp vdi kha nang cua tirng giai doan phat trien luu vuc TAI LIEU THAM KHAO Nguyen Van Cu va nnk (2003) Nghien cihi ludn cukhoa hoc cho cdc gidi phap phong tranh han che hau quu Id hit lini vuc song Ba Bao cao tdng ket de tai doc lap cap nha nude Ha Ndi Nguyen Lap Dan, Vu Thi Thu Lan, Hoang Thanh Son, 2008, De xuat mi t?hdp yhdm: tranh gium thieu cdc tai bien thien nhien cho hru vuc sons Thu BdnVii Gia Tap chi cac khoa hgc vl Trai dk, Tap 30- Sd -11 Truong Dinh Hien ^'a nnk, 2002, Khdo sut Idp huo cao nghien ci'ni quy hoach chmh tri sdng vimg xdi la diem cua sdng Lgi Giang Biio cao tdng ket de tiii, Sd Khoa hgc cdng nghe Binh Djnh Sd Khoa hoc cong nghe va Dai KTTV khu vuc Nam Triing bd (2009/ Xay dimg bdn nguy ca ngap hit Tmh Binh Dinh Bao cao tdng kit dl tai To chii-c ho'p tac quoc tc Nhat Ban (JAICA) (7/2003) Kd hogch quan li luu vuc Idng hap cho hni vuc sdng Kdn Nghien cuu ve phat triin va quan li tai nguyen nude tren toan qudc tai lurdc Cdng boa xa bdi clui ngliTa Viet Nam tap Vien Quy hoach Thiiy lo'i, 2005, Bao cao dgc didm lugng thuy vein Binh Dinh Trung tam Khi tugng - Tluiy viin Quy Nhon 866 Hgi nghi Klioa hgc Dia ly Toan quoc idn tlniS - Hd Ngi 2010 ... Ddng giap biln Ddng HIEN TRANG TAI BIEN LU LUT, SAT LO DAT TREN LUU VUC LAI GIANG VA MOT SO BIEN PHAP PHONG TRANH 3.L Tai bien lu lut • Che dd lu tren luu vuc Lgi Giang Qua nghien ciiu sd lieu... ngudi diin ve tai biln ki kit va thuc bien ciic bicii phiip phong Iriinh, giiim tbilu thiet hai ve ngudi va tai san KET LUAN Nhiin" niim gan diiy tren luu vuc Lai Giang Tinh Binh Djnh, tai bien ki... uoin nhanh sdng chinh lii An Liio \a Kim Son Llai nhanh sdng nil} hgp luu tai | ^i Khanh ddng chinh Lai Giang Luu \ uc l,ai Giang dugc hinh tren khdi niin" Kon i u m cau tao bdi cac da niacnia tram