• KHOA HOC CONG N G H E • TiNH TRANG SAT Ld DAT d CU LAO RUA (THANH HOI), TXTAN UYEN, BJNH Dl/ONG, NGUYEN NHAN VA GIAI PHAP KHAC PHUC GS.TS NGUYEN QUOC DUNG, THS VC TIEN THU,, THS THAI QU6C HIEN Vifn Thuy cong, Vi$n Khoa hoc Thiy lai Vift Nam Tom tit: Di lich khao cS hoc Quic Gia «a Lao Rua» (Thanh Hgi) thu6cxa Thcrnh Hoi thixSTdn Uyin (Binh Duan^ nUing nam g&n day la mit nhimg lOtu vuc sc, Ii nghien, trong,hm i dusSng BSng Nai Sat U M khong nhOng lam mat dot phi vS cac co so tang, cac d, t,ch khao c6 macdnanhhudnglcmdintamly, daisSng thdm chi la tinh mgng cua nhieu ho dan n vdy di dam bao an todn cho khu dan cu va cdc cong trinh tang khu vuc dgc btft la viic hdo tin cao gia tri van hoa lich su xa hgi cua Cu Lao Ri.a; Rdt cdn co nghien cuu danh gia thvc trgng sgt la dk tim nguyin nhdn tir dS xudt gidi phdp khdc phuc co tmh khoa hgc kha thi than hien vch moi truang cho khu vfc ndy Abstract: National Archaeological Monument «Cu Lao Rua» (Thanh Hoi) is Thanh Hoi commune Tan Uyen town (Binh Duong province) In recent years, it has been one of the senous landslides in downstream of Dong Nai river Landslide not only loses land, disrupts infrastructure, archaeological remains, but also affects the psychology, life and even life of many households Therefore, to ensure the safety of residential areas and infrastructure works in the area, especially the preservation of cultural, historical and social values of Cu Lao Rua It is very important to have a study lo evaluate the current situation of landslide to find out the causes, thereby suggesting solutions that are scientific, feasible and environmentally friendly for this area C t LAO RUA VA THT/C TRANG S^TLdDAT 1.1 Cii Lao Riia Cii Lao Riia (Thanh H6i) thupc xa Thanh H6i, TX Tan Uy8n (Binh Duong) du^c bao hoc bdi dong chay chinh ciia song Dong Nai va dong chay phu te nhanh bao iron cu lao nhap vao dong chinh va chay xuoi ve Sai Gon Cii Lao Rua la noi co nhieu gia tri lich sir, van hoa, xa hoi va khao co hpc, noi dSy, da phat hien m6t di tich khao c6, co nien dai 3.500 - 3.000 nam, v^ la noi mang nhieu dau §n ciia c6ng cupc ma mang b6 coi ve phia Nam cua dan t6c; Khu khao c6 da dugc nha nuac c6ng nhSn la khu di tich khao c6 cdp Qu6c gia vao nam 2009 36 TAP CH( T A I NGUVeN Nl/OC SO 2-2018 Hmh l.Vitri Cii Lao Riia tren Google earth Toan xa co t6ng dito tich tu nhiSn la 423to (247ha ddt liSn), c6 229ha ddt san xuat nong nghi$p Toan xa dugc chia Sp, 13 t6 nong dto tif quan, co 760 hO v6i 3410 khau • KHOA HOC CONG NGHE • Ddn cu tap trung chu ylu dgc bd sdng eua Cu I^o va dai bg phdn song bdng ndng nghigp 1.2 Thffc trang sat Id h& sdng Tmh trang sgt Id bd sdng Ddng Nai ndi chung vd Cu Lao Riia ndi rieng da didn tii Idu hogt dgng udn khiie, djch chuyin ngang cua sdng d vimg ddng bdng Tuy nhidn, khoang 20 ndm trd lgi day tinh trang sgt Id didn cang nghiem tigng Tgi Cii Lao Riia, theo kit qua khdo sdt, dilu tra thyc td, hien cd dogn dang xay tinh trgng sgt Id vdi miic khdc vdi tdng ehilu ddi 2,6km Cy thi nhu sau: TT Vi tri sgt Id Dogn 1: tgi vi tri hgp nhdt cua Cu lao ben nhdnh sdng Chhih cd chilu ddi khoMig 500m, Cac vach sat Id hinh thdnh dgc bd sdng, phdn Idn b l mat vdch cd dgng dde diing Chidu eao vach ddng khodng tii 2,0m din 3.0m Doan 2: Tai cudi Cu lao ben nhanh sdng Chinh cd chieu ddi khodng 300m Hien cd mgt so dilm sat Id eye bd vdi chilu dai khoang tir 10-30m, phdn Idn mdi bd sdng cd dang d i e diing, chilu cao vach diing 2,5m din 3,0m Doan : Todn bg doan ndy dang bi sat Id Phdn Hmh anh Idn be mat vach cd dang dde diing Chilu cao vach dung khoang tii 1,5m din 2,5m Doan 4: Td thugng luu cdu Thgnh hgi ddn hg luu J^ Cdng cdt Trdn dogn ndy cd mgt dilm sgt Id khd nghiem trgng xen kd Mdc dd tang ddn td hg luu vd thugng luu Phdn Idn bd mat vach cd dang dde diing (gdc dde 80-90°)- Chilu eao vdch dting kfao^g tu 2,0m den 3,0m Doan 5: Tir thugng luu Cdng cat keo ddi 350m ve phia thugng luu Sat Id tren toan bd chidu ddi Phan Idn b l mdt vdch cd dang doc diing (gdc doe 80-90o) nhu mdt vdt dao cdt ddi tir dinh vach ddn tdn mdp nude Chilu cao vdch ddng khoang tir 2,5m d i n 3,0m Dde bi^t c6 mdt s6 vi tri chidu eao vdch diing len den 3,5-4,0m H^^^L^j^^^^^^fiiHJI^^^j TAPCHfTAlNGUY6NNi;OCS62-2018 37 • KHOA HQC CONG NGHf • Vi tri sat Id TT Boan 6: Ddu rua (ddi didn rgch Tdng Bdn) Khoang 100m da dugc ngudi ddn gia cd bdng da dd Dogn cdn lai chua dugc gia cd vdn dang hi sat Id Dogn 7: Ddu riia (ddi dien rgch Tdng Bdn), cdch dogn khoang 180m vl phia thugng luu Chieu ddi 60m, sdu vdo bd khodng 6m; Vach diing cao khodng 2,5m NGUYEN NHAN VA CAC YEU T TAC DQNG Cdc nhan td co kha ndng gdy sat Id bd dugc chia thdnh nhdm chmh bao gom: Nhan td vd dieu kidn ty nhien (khdeh quan) vd nhan to tdc dgng eda ngudi 2.1 Tdc d$ng ciia cac ylu t l ty nhidn 2,1.1 Tdc dpng cua dong chdy lin long bd sdng gdy sg.t l& Cdc mdu bun eat ddy ed dudng kinh hat trung binh xdp xi khodng 0,3-0,5mm tuong ung vdi vgn t6c khdng xdi cho phep tu 0,35m/s din 0,48 m/s pm Hinh anh hmi^ ddi lien tuc tiong khodng thdng lii chinh vy Ddy Id mgt nhung nguyen nhdn chinh ddn din xu hu&ng xdi l& chung tqi khu v^c Cu Lao Riia 2.1.2 Tdc dpng ciia yeu to dong chdy tg.i khuc song cong Khu vye sat Id trgng dilm tgi Cu Lao Rua la dudng bd trdi vi tri ed rua bdn Nhdnh Phg Nguydn nhan gdy sat Id khu vyc ndy ngodi cac yeu to chung eho khu vuc nhu myc nude thay doi, van toe ddng chdy Idn thi mgt nguydn nhan chmh quylt dinh tdi sgt Id la ylu td ddng chay tgi khu vyc khdc sdng eong Bd sdng cd cdu tgo ^ a chat chu yeu la set deo mIm, deo chdy vdi dudng kmh hgt ti-ung bmh khodng (0,005^,025)nim tuong dng vgn tdc khdng xdi cho phep [Vkx]b- (0,12^,26)m/s Tir kit qud khdo sdt thuy vdn thdi gian tii ngdy din thdng ndm 2017 vd tinh todn md hinh cho thdy van toe khu vyc nghidn ciru ludn ed nhidu thdi didm d cae mda ndm cao ban [Vk^] eua dia chdt nen vd bd sdng Kdt qud tinh todn ciing cho thdy tdc dg ddng chdy vdo tiidi ky dmh lii tgi cd nhdnh rat cao ed nhihig thdi dilm eao nhdt len den >(I,3 -^1,4) m/s vd thdi gian vdn tdc ddng chdy > [Vtx] kdo 38 TAP CHfTAl NGUYfiN Nl/{5c S(5 2-2018 Hinh Phdn bd lint tdc tgi khu vuc khik sdng cong (cS riia) - Nhdnh Ph^i • KHOA HOC CONG NGHE • Kdt qua tmh todn td md hinh chieu dd thi hign dung bdn chdt va quy ludt ddng chay tai khu vye khue sdng cong Md phdng vdi ndm lu Idn (lii 2000) mgt sd kit qua chinh nhu sau: Van tdc tmng bmh khodng (1,3-1,4) m/s nhien cd nhihig vi tri vgn toe eye dai Idn din 2,6m/s Khu vyc sat bd hinh nhiing xody nude tang nguy ca sgt Id khu vyc Ket qud tinh toan trdn mdt bdng vd mdt cdt ngang tgi khu v\rc khue sdng cong trdn nhdnh phy eho thay khu vuc khdc sdng cong ddng chd luu ludn cd xu hudng dp sdt vao phia bd, vecto vgn tdc tgo thdnh cdc eu^n xoan hudng thdng vdo bd vd theo dudng bd ddm xudng phia ddy sdng, tac dgng cua van toe ndy se pha v5 kit cau ddt bd va ldng sdng (MC2, MC3, MC4), day chinh la nguyen nhan chinh gay hien tugng sgt Id bd va xdi day khu vyc ndy 2.1.3 Tdc dpng cua kinh Tong Bdn din che dp thuy luc khu vuc nghiin citu Kenh Tdng Ban tidu thodt nude thdi, nude mua eho cae khu cdng nghidp, khu dd th} mdi Binh Duang va ede phudng Thgnh phudc, Khdnh Binh, Tdn Phudc Khdnh 0,37m/s Nhu vgy vige xa nude td kdnh ed tdc dOng Idn tdi ehl dO thuy lyc ddng chdy nhdnh phy theo hudng tieu eye Luu lugng xd edng Idn tin miic de dga din nguy ca an todn dudng bd phia Cu Lao Riia edng cao 2.1.4 Cff chi gdy trwgt b& sdng du&i tdc dpng c&ayeu tS m^c nu&c Myc nude sdng len xuong theo chd dg bdn nhdt trieu (2 lan/ngdy dem) cd tiong mua ki§t vd miia lii dd ldm eho dat bd sdng bi khd udt lidn tyc, qud trinh kdo ddi lam suy gidm lidn kit gitia cdc hgt ddt va anh hudng ddn dn dinh bd Myc nude Idn xudng dd Idm cdt nude tiong ddt vd ngodi sdng chdnh Idch tgo gradient ddy khoi ddt gdy trugt ve phia ldng sdng, ddng thdi ludn xudt hidn ddng thdm ed xu the chdy td bd muc nude ngodi sdng thdp Do ed myc nude trilu vdi bidn dO Idn (2-^3m) ndn dnh hudng cdng manh, dac bidt vdi nam gdn ddy, myc nude thdp nhdt ede thdng ndm dang ed chilu hudng thdp hon thi dnh hudng eda mye nude din sat Id bd cdng manh hon Hinh Sa dS Itec tdc dong len suan dde CO qp luc thiiy dpng Hinh Phdn bd luu toe dong chdy tgi kenh tdng ban Theo kit qua tmh todn vdi cac trudng hgp luu lugng xd tii kdnh Tdng Ban Id m /s, 50mVs va lOOm^/s cho thdy: Khi ed ddng chay tir kdnh Tong bdn thi ddng chii luu ed xu hudng ep sdt vd sdu vdo khu vye vi tri bd tiai vdi van tdc ddng chay tdng Idn khodng 0,30- Qua cdc kit qud tinh todn on dinh tdng thi tgi cdc vi tri sgt Id bdng phan mIm phan tich on dinh mdi doc Slide cua Roescienee Inc (Canada) vdi ede trudng hgp myc nude Idn nhdt, myc nude nhd nhdt, myc nude trung binh, thdy rdng: Chenh l|ch myc nude tiong bd vd ngodi sdng Idn trilu nit chinh la mgt tiong nhiing nguyen nhdn dan din tinh tigng sat Id ddt TAP CHfTAl NGUYEN Nl/flC S6 2-2018 39 • KHOA HQC CONG N G H g bd sdng d Cii Lao Riia Muc dnh hudng cua ydu t l ndy phy tiiugc vdo dilu kien dia hinh, dia chdt cua tdng khu vyc Vdi nhiing khu vyc ed • chilu cao mdi dde Idn, them sdn]I sau va dja chdt ylu thi dnh hudng eua ydu to ndy Id rdt ro r^t (Dogn so 3, sd vd sd 6) ket qua tmh todn Bang Kminml STzT Vi tri tinh toan THI TH2 THS [K] ^s6nc Doan Doan Doan Doan Doan Doan Doan 01 02 03 04 05 06 07 1,753 2,122 1,281 1,969 1,106 1,572 1,552 2.2 Cac nguyen nhSn va y^u tS tac d^ng ciia ngtroi 2.2 L Tdc dgng van hanh thuy dien Tri An Qua phSn tich cac tai lieu v^ qui trinh van hanh cua Thuy diSn Tri An va ket qud tinh toan bang m6 hinh tinh toan thuy luc chidu M1JCE21 thdy rang: + Ve mua ki6t: viSc v | n hanh thiiy dien Tri An CO tdc dpng khong dang k6 ddn chd dong chay viing du noi chung v4 Cu Lao Rua noi rieng + vd mira lu: viec v§n hanh h6 thuy di?n Tri An CO tac dpng rdt Ion ddn ngap lyt cung nhu x6i 16 khu vuc nghien ciru Vi$c c5t dugc dinh lu cung nhu didu tidt lugng nuac lam giam luu lugng dong chay vd h j du tir d6 gitai van tdc dong chay qua khu v\tc du an lam giim dang kd kha nang xoi lo khu vyc ndy Tuy nhiSn, mot vdn dd quan trgng nhdt toi xoi Icr ba 14 ydu td phii sa la Ivmg Nhu cdc s6 lieu da thu th|ip thi thi xdy dung hd Tr; An lugng bun cac vd du gidm ddng kd khodng (40+50)% didu ndy ddng nghia vcri gia tang xoi Id vd syt liin ddy song khu vyc h j du theo hieu ling nuac 40 TAP CHfTAl NGUY6N NITOC S(5 2-2018 1,125 1,448 0,743 1,121 0,992 1,006 0,957 1,007 1,062 0,516 0,976 0,751 0,766 0,747 1,15 1,15 1,15 1,15 1,15 1,15 1,15 2.2.2 Tdc d^ng tinh trgng khai thdc cdt qud muc khu vice So sanh tai li|u dgc dia hinh cdc nam 1995, 1999 v4 2004,2017 CO thd nhan thdy ldng song bi bidn d6ng n^inh, day song lien tuc hg sau NSm 1995 cao d6 day song khoang -7m ddn -8 m, nSm 1999 lgch sdu -1 Om ISch vd phia b& trdi, nSm 2004 sau -Um Ddn nay, theo bdn dd ffia hhih 1/5000 dugc khao sdt thang ndm 2017 cao d0 ddy song tai khu vuc dd toi -14m, khu vuc cudi cl lao ddy song da sau xudng ddn -I7m Co chd sat Id la khai thac cdt qud gdn iii, ddy song bj hg thdp lam mat chdn mai taluy tu nhien, tSng chidu cao mai dde ho|ic cac tgo cdc hdm ech ngam, ddn vugt qua trang thai gioi hgn thi todn bg khdi ddt se bi s?p xudng s6ng, di6u n4y \f gidi cho thirc td cdc vach sat 16 bo song khu vyc Cu Lao Rija ddu co co dgng doc diing (g6c dde 80° -90°) nhu mOt vdt dao c5t dai tii dmh vdch ddn tin mep nu6c Ngodi ra, vi^c khai thac tap trung, at tgi mgt vi tri gdn b6 hinh thaoh nen hd xoi sdu, kdt cdu d6ng chay hi thay ddi tgo d6ng xoay gay xoi 16 day va b6 Tir cdc sd li$u thdng k6, so sdnh n8u trto k | hgp voi khdo sdt thuc td tir ngudi dan va chinh' • KHOA HOC CONG N G H E • quyln dia phuong thdy rdng tinh tiang sat Id ddt nghiem trgng nhdt thudng xdy vdo cdc thai ky du an khai thde cdt, nao vet tuydn ludng dugc thyc hign Didu cd thi khdng dinh hogt dgng khai thdc khdng theo quy djnh v l sau, khodng each xa bd vd quy trinh khai thdc la nguydn nhan chinh gay tai biin xdi Id bd sdng tai khu vye Cii Lao Rua 2.2.3 Yeu to tdc ddng sdng cua tau thuyin hogt dpng tren sdng Sy gia tang ca vd s6 lugng lan tdc cua cac loai tau ihuyen chay trdn sdng da tgo nen nhiing dgt sdng manh vd vdo bd, khiln cho sat Id bd vdi miic dd dang lo nggi Dudi tae ddng eua sdng (dp lyc song) mdi bd sdng hi phd vd kit cdu, cdc hgt bun cat thugc bg phan eda long ddn hi tdch rdi va van chuyen di noi Idiac, ndu qua trinh tidn dien Idu ddi, lien tuc chdn mdi bd se bi xdi tao thdnh hdm Ich ddn den khdi ddt bd mat dn ^ n h vd syp Id Kit qud tinh toan tinh todn sdng tau chay trdn sdng Ddng Nai qua khu vuc nghien ciiu eho thay hdu het cac logi tau co tdi trgng tir 300 tan trd len chay rdn sdng Dong Nai khu vuc nghien cdu ddu co tdc ddng chdy Idn nhat cua sdng dudi tdu Idn ban van tdc khdi dgng bun cat cua bd sdng (Vkj = 0,12m/s - 0,26m/s) Ddi vdi ddng chdy nguge d hau h i t eac tdu cd tdi trgng td 300 Tdn trd len ddu cd tdc dp ddng chay nguge Idn nhdt gdn bd gdp , - lan so vdi vgn tdc khdi dgng biin cat long dan Nhu vdy sdng tdu thuyin luu thdng trdn sdng Id mdt nhiing nguydn nhdn gay ndn hign tugng sgt Id bd sdng tren dia bdn khu vyc nghien eiiu DE XUAT CAC GIAI P H A P KHAC PHUC TINH TRANG S-4T L& CU LAO R t A 3.1 Cac giai phap phi cong trinh Cdc giai phdp phi cdng trinh la nhiing gidi phap qudn ly, hmih chinh md khdng can thiep tryc tidp vao hi^n trgng cac khu vuc sgt Id Can cd vdo dilu kien thuc t l tgi Cu Lao Rua co thi dp dung cdc gidi phap phi cdng trinh sau: Du bdo didn bien ldng sdng, bd sdng, xac djnh hanh lang dn dinh lau ddi, tidn eo sd dd cd quy hoach phat tiidn dai ddt hai ben sdng + Dy bao dien bidn long sdng, bd sdng: dy bdo diln biin long ddn theo nhidu Hch bdn khdc Lap cac ban dd du bao nguy ca sgt Id tiong tuong lai ddn ndm 2025 va 2050 Td chirc theo ddi dien bidn xoi Id bd sdng ve quy md, cudng dg, hudng dich chuyen theo dinh ky: vd khdi^ theo dinh ky vdi eac tinh hudng lu xdy Xdy dyng thdng ke, lim tru co sd du lieu kiem sodt xdi Id +Cdm mdc ednh bdo sat Id, di ddi ddn cu, quy hoach phdt triin dya tidn kit qud tinh todn, dy bdo didn bidn long sdng, bd sdng din ndm 2025 va 2050 - Xdy dung he thdng quy pham phdp ludt qudn ly long sdng - Quy hoach va thyc hidn nghiem quy hogch nao vet ludng laeh va khai thdc cat - Tang cudng xd ly tridt de tinh trgng khai thac cat lau tiong khu vuc - Quy hoach, khai thac hgp 1^ giao thdng thdy tiong khu vyc - Giai phdp tuyen truyen nang cao nhgn thdc cgng ddng lien quan tdi sat Id bd sdng 3.2 Cac giai phap cdng trinh phong chong sgt Id dat Cii Lao Rua Hidn nay, cd rat nhieu gidi phdp ky thuat cimg nhu cdng nghe phdng ehdng xoi Id, bdo vg bd dd vd dang dugc iing dyng d Vidt Nam vd tien thi gidi Tuy nhien, moi gidi phap hay loai hinh cdng nghg chi dp dung gidi han cho mgt so loai huih long dan vd dieu kign ty nhien xac dinh Tgi Cu Lao Riia, mdi vi tri sat Id cd dilu kien dja hmh, dia chat, thuy lyc, ddng chdy khac ndn cdn phdi CO gidi phap cdng trinh phu hgp tuang dng 3.2.1 Di xudt gidi phdp cdng trinh ehdng sgt Id ddt Cii Lao Rua tgi vi tri diim sgt la ben nhdnh Song lan Vi tri ^em sat Id ben nhanh sdng chinh vdi chieu dai khoang 500m Bd sdng cot^ vdi ban kmh TAP CHfTAl NGUY£N Nl/tfC S6 2-2018 41 • KHOA HQC C N G NGHE • gia tdng dg dde vd chieu eao mdi dong thdi cd ftg tgo cdc ham Ich Den miia mua lu ddt bd sdng d trang thai bao hda nude lam gidm lyc dinh kit giiia cdc hgt dat, ket hgp vdi trilu nit xuong ddng thdm thodt mdi sdng co gradient Ion sinh dp lyc tiiuy dgng cd xu hudng ddy khii ddt ngodi sdng Khi dd todn bO khdi dk Nguyen nhan vd co che sat Id tgi vi tri nay: mdi sdng bi mdt cdn bdng sd lgi sup xudng, Ban ddu, tinh tiang khai thac cat qua mice, qud Vdi didu ki^n dia hinh, dia chdt, thiiy van gdn bd ldm mdi dde bi mdt chdn, tao ham ech ddng chdy vd nguydn nhdn co ehe sgt Id eua vi ngam dan ddn bd sdng b; syp xuong, vdch bd sau tri Nhdm nghidn edu de xudt gidi phdp sgt Id cd mdi dde gdn nhu thdng diing vd ludn cdng trinh bdo ve bd ching sgt Id la Ke mdi d trgng thdi cdn bdng tdi han Ddng chdy lu vd nghidng bdng cae tdm BTCT ldp ghdp hodc ke sdng tdu tdc ddng tryc tilp vao b l mgt mdi mem sinh thai bdng bao tdi cdt vd trdng cd Trong dde sau bi sgt Id khdng cdn hd thyc vdt bdo do, gidi phdp kit c6u kk mim sinh thdi bang bao vg vdi luu tie Idn hon gid tq [Vkx] cua ddt se vgn tdi cdt vd cd la phieang dn nhiiu uu diim chuyin ddt cat di noi khdc eung nhu tilp tyc xdi hon s^ dung nhieu vpt li^u tfc nhiin, than phan cdn Igi cua mdi sdng vd ddy sdng cang ldm thipn v&i mdi tru&ng R=1750m, Chilu rgng sdng khodng 400m, dia Wnh ldng sdng cd dang chii U, lgch sau d gjiia sdng, cao dg trung Hnh day sdng -10m Dde bigt cd 01 ho sdu ddi 750m, rgng 120m, cao dg day -14m Them sdng thodi vd dg dde khodr^ 10%, bd sdng cd mdi khd doe 1:0,5, tgi cac vi hi sgt Id mai g ^ nhu dde ddng Chieu cao mdi dde khodng td 2,0m-3,5m Hinh Hinh anh ke mat nghieng mem sinh thdi Hinh Hinh dnh ke mdi nghiing mim sinh thdi 3.2.2 De xudt gidi phdp cdng trinh ehdng sgt l& ddt Ci4 Lao Riia tgi vi tri diim sgt la ben Nhdnh Song Phu 42 TAP C H I T A I NGUYEN Nl/Oc 5(5 2-2018 Dae didm dia binh : Ddy Id dogn dinh cong bd ldm bdn Nhdnh sdng Phy tgi vitiic6 Cu Lao Rua cd tdng ehilu ddi khodng 1.200m Trong dd, Dogn ddi 700m, Doan edng cat dd dugc kd ddi 100m vd Doan ddi 400m, bdn kinh dhih cong dudng bd R=380m Bd m|t vdch sat Id cd dang dde diing (gdc die 8O°-90% chilu cao vdch ddng khodng td 2.5m din 3.0m Dac bi^t ed mdt sd vi tri chilu eao vdch diing Iendln3.5-4.0m Nguyen nhdn vd co chd sgt Id: Ddng chay cd van tdc Idn dp sat vdo bd kit hgp vdi ddng chdy hudng ngang thuc thdng vao bd se ddo xdi bd • KHOA HQC CONG NGH|: • sdng, khoi ddt phdn dp cua mdi bd hi suy gidm dan Din mgt gidi hgn nhdt dinh mdi bd sd bi mdt on dinh va sgt Id sS xdy Nguydn nhan kit hgp vdi vide vdo mua mua Iii, ddt ludn d tigng thdi bao hda vd trilu nit xudng thdp sS ldm tdng eao nguy ea sgt Id mdi sdng Phirong dn k^ tudng dung bdng cpc ban chan mdc du cd kinh phi xdy dyng eao ban nhung lgi bdo vg chong sgt Id mdi sdng tii^t de hon Ngodi ra, phuong dn ndy ed Ihl Imh ddng tiong phdn kf ddu tu trudng hgp cd khd khdn vl kinh phi Dd xudt gidi phdp cdng tiinh ching sat Id ddt Oil Lao Rua tgi cdc vi hi cd nguy co sat Id ddt cao Wide Cdc dogn sat Id va cd nguy co sgt Id cao cdn Igi tgi Cu Lao Riia bao gdm: E)oan 2, Doan 3, Etoan va E)ogn Trong dd cdc doan ndy cd dieu kidn dia hmh va ddng chdy tuong ddi giong Vd dia hinh: Cac dogn ndy dIu cd mdi bd sdng doe, chieu cao mai tir 2m-3m, thim sdng khd thodi Phia tien bd la khu vyc ednh dong khdng ed nhd dan Ve dieu ki^n thiiy lye: Cdc dogn ddu khdng chiu tdc ddng tryc tilp tir ddng chay, nhien ddng chd luu vin cd xu hudng dp sat vao bd va Idn hon Hinh Mat cdt ngang diin hinh fee tu&ng CQC ban chdn Vdi dde dilm vd nguydn nhan, co che sgt Id ciia vj tri thdy rdng, gidi phdp tudng cdn vd gidi phdp ke tudng ddng bdng egc ban chdn cd nhieu uu dilm vdi hi^u qua hudng ddng chdy tuong duong nhau, tae dOng thuy lyc din eac khu vuc xung quanh khdng ddng kl Tuy nhidn [VIH], Ngogi trd vi tri s6 vdo mua lii dnh hudng cua kdnh Ting Bdn nen ddng chu luu cd xu hudng dp vdo bd nhung ciing khdng qud Idn De bdo v^ mai bd sdng ede khu vye ndy khdng hi sat Id thi thi gidi phdp edn co va phu hgp nhdt Id giai phdp ke mdi nghidng bdng cdc cdu ki^n BTCT ldp ghdp phia tren muc nude thap vd thdm rg dd phia dudi myc nude tiidp Ddy Id gidi p h ^ mang tinh bin vthig vdi gia thdnh hgp Iy Hirdi Mdt cdt ngang ke mdi nghieng cdu ld$n bi tdng ldp ghep TAP CHfTAl NGUVeN Nl/(3C 5(3 2-2018 43 • KHOA HQC CONG N G H g • chdy rdn (phd sa la liing vd bun cat ddy) vd dilu KET LUAN, KIEN NGHI Sdng Dong Nai dogn chdy qua khu vyc Cd tra ddnh gid lgi ti^ lugng cdt cdn Igi tren todn h^ Lao Rua Id doan sdng phdn lgch, ham lugng bun thdng hg Imi sdng Dong Nai td sau Thdy difn Tri cat nhd, ehl ddng chdy chiu dnh hudng eda An den cdu Ddng Nai Tii ed the xdy dyng trieu biin Ddng vd dilu tilt eda eac cdng trinh duge mOt quy hogch tdng the vl nao vet ludng thugng ngudn, khai thac vat lieu ddng sdng manh lgch vd khai thdc cat d luu he thong sdng Ddng me Chinh vi vay didn biin eua doan sdng cdng Nai nhdm khai thac mdt cdch hi^u qud khoang san trd len phiic tgp neu ngoai tdc dgng chinh td vd luong lgch giao thdng thdy tren todn he thing dong chdy, viec khai thdc cdt tgi long sdng, xdy dyng chat tdi tir cdc cdng trinh ven sdng, xdm TAI L l £ U THAM KHAO phgm hanh lang an todn khdng duge kidm sodt chat chd theo Phap lenh da quy dinh Do dd, di Vien Thuy Cdng, 2018: Nghien cdu danh nghf chinh quyen dia phuong xem xet vd th^ gia hien tiang sgt Id dat d Cu Lao Rua (Thgnh hien day d6, ddng bp cdc gidi phdp phi cong Hdi) tixjng thdi gian qua, nguyen nhan, dy bdo va trinh dd de xudt, kit hgp v&i vi$c s&m cho triin de xudt gidi phdp khdc phyc khai ddu tu xay d^g cdc cdng trinh phong Vign Khoa hgc Thuy Igi midn Nam, 2006: chong sat l& bcr song Cii Lao Riia theo cdc Nghidn eiiu dd xuat cdc giai phdp khoa hgc cdng phucmg dn dugc de xudt di tdi theo timg nghg de dn dinh ldng dSn du sdng Dong Nai giai doqn thich hop Sai Gdn phye vu phdt tridn kinh td xd hdi vung Trudc mat: Ddng Nam Bd - Di ddi dan cu ven sdng tgi khu vye cd nguy Vien Khoa hgc Thuy lgi miin Nam, 2017: eo sgt Id eao (Khu vyc dinh eong tgi c l Cii Lao Khdo sdt, nghien ciiu danh gid tdc d^ng ddng Rua ben nhdnh Phy), cdm moc chi gidi, hdnh chdy sdng Ddng Nai doan qua khu vuc xd Tan lang ednh bdo sgt Id de khuyen cdo chinh quyln An vd xa Thi^n Tdn, huyen VTnh Cuu, tinh vd ngudi dan dia phuong khu vyc sat Id Ddng Nai ehua hoan chinh ede cdng trinh chinh tri PGS.TS Hd Quang Hdi - Trudng Dgi hpc Tiep tyc kien tri va quylt ligt tiong vige Khoa hgc tir nhien, Dgi hgc Qudc gia TP HCM ngdn chan tinh trgng khai thdc cat trdi phep tien 2003: Tai biin xdi Id bd sdng chuSi cu lao Binh cae nhdnh sdng tiong khu vyc Chdnh - Riia - Phd d hg lim sdng Ddng Nai Tgp - Ddu tu xdy dyng edng trinh chtoh tii cdp chi dia chat, sd 278 nam 2003 bach tgi ede khu vyc ddng ddn cu cd nguy ca sgt PGS.TS Hd Quang Hai Trudng Dai hgc Id cao tai Doan (L=600m) vd Doan Khoa hgc ty nhien, Dgi hgc Qudc gia TP HCM, (L=400m) vdi kinh phi tiiye hien udc tinh 2006: Nhin lai hogt dOng khai thdc md cdt Bdc khodng 55 ty ddng cdu Ding Nai, tinh Ding Nai Tgp chi dia chdt, Lau dai: sd 294 ndm 2006 - Ddu tu xdy dyng ddng bg hoan chmh ede cdng trinh ehdng sgt Id cho cdc Dogn lgi - Cd nhihig nghien ciiu ca bdn vd hien tugng lan tiaiyin xdi sdu, dac ddnh gid lugng ddng 44 TAP CHfTAl NGUYEN Nl/OC 50 2-2018 Ngudi phdn bi0n : PGS.TS Nguyin Thanh Hiing Phdn hi^n xong: 06/2/2018 ... Cu Lao Riia ndi rieng da didn tii Idu hogt dgng udn khiie, djch chuyin ngang cua sdng d vimg ddng bdng Tuy nhidn, khoang 20 ndm trd lgi day tinh trang sgt Id didn cang nghiem tigng Tgi Cii Lao. .. chinh ddn din xu hu&ng xdi l& chung tqi khu v^c Cu Lao Riia 2.1.2 Tdc dpng ciia yeu to dong chdy tg.i khuc song cong Khu vye sat Id trgng dilm tgi Cu Lao Rua la dudng bd trdi vi tri ed rua bdn Nhdnh... ddt Ci4 Lao Riia tgi vi tri diim sgt la ben Nhdnh Song Phu 42 TAP C H I T A I NGUYEN Nl/Oc 5(5 2-2018 Dae didm dia binh : Ddy Id dogn dinh cong bd ldm bdn Nhdnh sdng Phy tgi vitiic6 Cu Lao Rua