BO KHOA HOC VA CONG NGHE CHirONG TRINH KHCN CAP NHA NXTdC KC 08/06-10 B6 TAI: 'Nghien citu cff set khoa h^c va de xuat cdc giaiphdp khoa hpc cong nghe bdo dam sff Sn djnh vd dp bin cua de bien hi$n c6 tririmg hpp song, triiu cuing trdn qua di" Ma s6:KC08.15/06-10 BAO CAO K H A O S A T Bd SUNG TAI LIEU V£ DjA HJNH, DjA CHAT, KHi TU-aNG THOY V A N 02 VUNG TRONG DieiWI NGHIEN CLTU NAM DINH VA H A T I N H Ca quan chu tri: Trii'6'ng Dai hpc Thuy lpi Chu nhiem Sk tai: GS.TS Ngo Tri Vieng Ha n61, 2010 BO KHOA HOC VA CONG NGH$ CHirONG TRINH KHCN CAP NHA NUQfC KC 08/06-10 D£ TAI: "Nghien citu ca s& khoa hgc vd de xuat cdc gidi phap khoa hoc cong nghe bdo ddm sif on dinh vd ben cua de bien hifn CO truamg hffp song, trieu cir&ng trdn qua de" Mas6:KC08.15/06-10 BAO CAO KHAO SAT B S U N G TAI LIEU ve DjA HiNH, BjA CHAT, KHi TU'gNG THUY VAN 02 VUNG TRQNG BI^M NGHIEN CLTU NAM DINH VA HA TTNH CHU NHIEM BE TAI UAN CHU TRI Dito/ ' PHb''|li|U T L O G RT N GS.TS.Ngo Tri Vieng BO KHOA HOC VA CONG NGHE BAN CHU NHIEM CHlTONG TRINH KC.08/06-10 Ha npi, 2010 Wi' Pici I 2(H0 MVC LVC CHU-ONG BANH GIA DI^U Klf N D|A HINH, BjA CHAT, KHi TU'GNG VA THOY HAI VAN VUNG BI^N NAM BINH ; 1.1 T6ng quan ve bd" biSn va dS biin Nam Bjnh 2 1.1.1 Bieu ki^n ty nhien 1.1.2 Bd- bien Nam Bjnh 1.2 Banh gia dl4u kipn tirp'ng thiiy hai van 1.2.1 Gio Mua 1.2.2 1.2.3 Chi ao thuy triiu 1.2.4 Bao nhiet ddi 1.2.5 NiFvc dang bao 1.2.6 Chi dp song 1.2.7 Vin chuyen bOn cMvadilu klfn hinh thdi bo-biln 1.3 Binh gia dilu kifn dja hinh bv biin v i de blln Nam Bjnh 12 Bjahinh tu- nhien 12 1.3.1 1.3.2 Be biin 12 1.4 Banh gia dilu ki^n dja chit nln vimg xSy dyng de biin Nam Bjnh 15 1.4.1 Khu vyc Hal Hau 15 1.4.2 Khu vyc Giao Thuy 16 CHU-ONG BANH GIA BlfeU Klf N B|A HJNH, fljA CHAT, KHi TU-t^NG VA THCIY HAI VAN VCING BI^N HA TINH 2.1 Gid*! thipu chung v l viing biin Ha Tinh 19 2.2 Banh gia dilu kifn tu-ping thOy hai van 19 Mu-a 19 2.2.1 2.2.2 Dong chay sdng 20 2.2.3 Bao nhiet do-i 21 2.2.4 Thuy triSu 23 2.2.5 Nu'ffc dang 23 2.2.6 Dong chay biin cat 24 2.3 Banh gia dieu kien dja hinh bv biin va de biin Ha Tinh 24 2.4 Banh gia dilu kien dja chit nln vimg xay dyng de bien Ha TTnh 26 2.4.1 Be bien Hoi TJidng - Nghi Xuan 26 2.4.2 Be Thach Ha - huypn Lpc Ha 27 28 CHU'ONG KtT LUAN Tai lieu tham khao 29 CHU-ONG BANH GIA D i e u KlfiN 0|A H I N H , DjA C H A T , K H I T U - Q N G V A T H O V HAI V A N VCING B I ^ N N A M | N H 1.1 TSng quan v l bd- biin wi d i biin Nam Bjnh 1.1.1 Dieu k/?n ty nhien Nam Sinh tilp gidp vdi biin Ddng vl phia Phia Ddng Nam vdi ddi bd bien dai 72 km, thupe dja gidi hdnh chinh cua huypn: Hdi Hau, Giao Thuy, NghTa Hung Dipn tich cua huySn ven biin hon 720 km2, chilm xdp xi 44% dien tich tu nhien Cila tilth Tinh Nam Djnh c6 sdng Idn chdy qua : Sdng Hdng chay qua Nam Djnh vdi chieu dai xdp xi 70 km, biin Ddng qua cua Ba Lat Sdng Ninh Co ddi 60 km la chi luu bd httu cda song Hdng, phan luu tai cila Mom Rd, dd biin Ddng qua ciia Lach Giang Sdng Ddo ddi 33,5 km Id phan lim cda sdng H6ng, hpp luu vdi song Day t^i nga ba Dpc Bp, sdng Day chdy qua Nam Dinh vdi ehilu dai gdn 80 km, bien qua cda Ddy Sdng Sd la nhanh sdng nhd nhan nude tir cuoi Sdng Hdng thdng biin Ddng qua cira Ha Lan Hai Hau Id mdt huyen ven bien phia Ddng Nam thupe tinh Nam Dinh, nam khoang tir 20o00' ~ 20ol5'dp vT Bdc va 106oir~106o23' d6 kinh Ddng; phia BSc giap huyen Giao Thuy, Xuan Trudng, True Ninh, phia Ddng giap sdng Ninh Co, phia Nam vd Ddng Nam gidp Biin Ddng vdi dudng bd biin dai 27km 1.1.2 Ber biin Nam Bjnh Bd biin Nam Dinh keo dai tir eiia sdng Hdng din ciia sdng Ddy Id mpt ddi bd biin phdng, dja hinh thim luc dja tucmg ddi don gian vdi cac dang tich liln chau thd, thoai ddn tir bd khoi Nhin chung bdi biin tinh Nam Dinh hpp vd thip khdng cd vat cdn ehe chdn (trir bai Con Lu, Cdn Ngan cOa huySn Giao Thuy; Cdn Xanh, Cdn Md cua huypn Nghia Hung) Chieu rpng bai trung binh tir (100~150m) cd noi khdng cd bdi biin, bien tiln sdt chan de (Hdi Lj, Hdi Triiu, ) Cao dp teung binh (0.00 ~0.50), cd biet cd noi cao ttinh bai dudi (LOO) Xdi Id bd biin dien rdt phd bien gdy nhigu hau qua d mite dO khdc va cd the ehia thdnh doan nhu sau (xem Hinh 1): Doan 1: tit ciia Ba L?t din cua H? Lan ndm khu vpc bdi Doan 2: tit ciia Ha Lan din Con Trdn ndm ttong khu vpc xdi Id Doan 3: tti Cdn Trdn dSn eda Lach Giang tuong ddi 6n djnh • Doan 4: tir Cflra Ljch Giang den Cira Ddy ndm khu vpc bdi Trong dd doan bd biin Hdi Hdu bj xdi Id den 3/4 chieu ddi tit ciia biin H? Lan din Cdn Trdn, khu vuc xdi Id manh nhdt thu$c dja phdn xd Hdi Ly, Hdi Chinh, hien vin dang bj xdi mjnh, khdng cdn cdt phia ngoai, dp ddc bd bien tir - % 1dm cho dudng bd trd nen tuong ddi didng, dpc theo hudng Ddng Bde - Tay Nam , ^ TINH T H A I BiNH TINH HANAM / / TINH NAUOjNH (, "} CJaBil«l Hina GlasTknf \ / I f Haw Hdi Hai J I TINH NINH BiNH ?y MILf f Hôlw Jy \ ã O'/ "fi^^i/ / v^V 'H"Wô X NsksMme/ / ã.'& \ // \ S L/ , / ' -^V^'" vs \ X ' ^ ladi GiangV CABiy ^ Y H*Tii^/ V \ / VINH BAG BO V ^ \ SKh) Dac diem hinh thai xdi boi ciia do^n b6> biin Nam Djnh 1.2 Banh gia dilu kifn tu'p'ng thiiy hai van 1.2.1 Gio Xdt b6i canh nghien eiiu cd thi ndi rdng Nam Dinh ndm khu vuc bat lpi ve h$u nhipt ddi gid miia Vl mua ddng, chju dnh hudng eda hp th6ng gid miia ddng bdc vdi cac hudng gid thjnh hdnh 14 Bde, Ddng Bde vd Ddng Vl mda he, chju dnh hudng eda hp thdng gid miia Tdy Nam, vdi cdc hudng gi'd thjnh hanh la Nam vd Ddng Nam Hinh bieu dien hoa gid theo cdc thdng dpa tiin tdi li?u quantedcnhilu ndm tjitt^unVdn Lu ^^= • Hinh : : ^ ^ - 1^ y \ Hoa gio theo cac thang tram Van Lu- - Nam Dinh Cd thi thiy ring thdi ky gid mia Ddng Bdc tir thang IX din thang XII, hudng gid Bdc thjnh hanh hon cd va tdn sudt dao dpng tir 19,8 ~ 29,7%, tir thang I din thang IV hudng gid Ddng Bdc thinh hdnh hon cd vd tin suat dao dpng til 25,2~41,9%.Gid miia Tdy Nam ho?t dOng tir thdng V din thdng VIII vdi hudng gid Nam thjnh hdnh hon ca vdi tin suit tir 19,5 ~ 35,9% 1.2.2 Mva Tai Nam Djnh miia mua tudn theo quy ludt ciia khu vuc Ddng Bdc bp: bdt dau tir thdng din thdng 10, vdi lupng mua trung binh nam biin d6i ttong khodng 1.700 den l.SOOmm Phdn bd khdng mua cdc thdng khdng diu nhau, 85% lupng mua xay vao miia mua Lupng mua trung binh thdng Idn nhat dat vdo thdng vdi lupng mua bien ddi tir 350 ~ 400mm Lupng mua trung binh cdc thdng miia mua la 244 mm (xem Bang 1) Lupng mua trung binh cdc thdng mda khd ehi dat 48,6mm S6 ngdy mua trung binh nam Id 140 ngdy, sd mua trung binh cdc thdng tuong doi dong deu, biin tii ~ 15 ngdy Bdng Lu'p'ng mua trung binh thdng trf m Vdn L^ - Nam Djnh Tr^m 11 111 IV V VI Vll VIll IX X XI XII VSnLJ 23,8 34,0 37,6 70,1 131, 183, 211, 339, 393, 226, 80,6 22,1 Nhu v^y cd the thdy rdng Nam Djnh ndm ttong khu vuc cd lupng mua vira, lupng mua phdn b6 tuong ddi ddng diu Vin dl mua lu tir sdng d viing biin Nam Dinh vdy khdng nghi£m ttpng 12.3 Che dg thuy trieu Chi dO thiiy ttilu d khu vuc nghien cihi ndm ttong chi dp ttilu vjnh Bdc Bp Id chi dd nhdt triiu vdi bi6n dp khd Idn vdi bien dp bien doi tir 1,5 ~ 2,0 m Muc nude triiu tai Vdn L^ vdi muc nude ttilu tai Hdn Ddu cd he sd tuong quan dat 95 % Chu k^ khodng 25 ngdy va ttong mOt ngdy cd ciing ed mOt dinh vd mpt chan triiu Muc nude triiu Idn nhdt tai Ba Lat theo ehu ky 19 ndm cd th8 dat tdi eao ttinh 1,75 m (h§ cao dO VN-2000) Nhu vpy ttong dilu kien triiu cucmg kit hpp vdi nude dang thi muc nude trade de khd 16n, sdng dd cd thi tiln sau hon dieu kien dja hinh bai trade de thip va cd thi tdc dpng true tilp len d8 f.2.4 Baonhi^ta&i Nam Dinh chju anh hudng true tilp hojc gidn tiSp cua bdo vd dp thdp nhi^t ddi, xay ttong thdi gian tir thdng din thdng 10 Tir ndm 1990 din ndm 2000 ttong viuig da chju anh hudng cua tten 50 bao Bdo thudng hinh thdnh tir phia tay Thdi Binh Duong, vupt qua Philippines vdo biSn ddng sau dd bp vdo bd biin Trung Qudc, Vi6t Nam ho|e tan tten biin So lieu thdng k6 cho thiy hdng nam, trung binh cd hi - bdo bd vdo bd bien miln Bdc Vipt Nam gay dnh hudng trpc tilp hojc gian tilp din bd biSn Hai Hdu, nhien cQng cd nhimg ndm cd hon 10 bdo bp nhu ndm 1964,1973,1989 Cd the nh|n x6t rdng Nam Djnh ndm ttong khu vpc chju dnh hudng thudng xuyen cua bdo vd dp thip nhipt ddi (xem Hinh 3) Bdo kit hpp vdi nude dang vd sdng Idn cd the gay nhihig tdc dpng bit lpi cho khu vpc bd bien ciing nhu Id nhiing cdng trinh bao vp bd biin tinh Nam Djnh Hinh Bu-vng di cua cac can bao tip 1950 - 2000 bo vac vjnh Bac Bp cho thay Nam Binh nim khu vyc trung tam cua viing anh hu'dng f.2.5 Nirac ding bao Nude ddng khu vuc xdy cd anh hudng cua gid bao vd dp thip nhiet ddi Bd biin Nam Dinh ndm ttong khu vpc vjnh Bdc Bd nSn cd bao d vinh Bdc Bp diu gay nude ddng, nude rut d viing biin Nam Djnh, khu vuc phia bdc bao chiu anh hudng ciia nude dang, khu vuc phia nam bao ehiu anh hudng cda nude riit Cdc bao dp bp vdo cdc tinh Ninh Binh, Thanh Hda, Ngh? An, Hd TTnh gay nude ddng tai bd biin Nam Dinh Bdo cdo chuyen dl "Khao sat nghiSn ciiu cdc ylu td nhien vung biin Nam Djnh" eua Vipn Khoa hpc Thuy Lpi cho thiy: ttong mdt s6 bdo bp vdo cdc tinh ndy cac ndm tir 1975 din 1989 gay nude dang tit 0,5 din Im t?i bd bien Nam Dinh Bao Damrey (sd 7, 2005) gay chiiu cao nude ddng quan ttdc dupe d Hdi H?u Id 2,05 m Do bd bien Nam Djnh thip nSn nude ddng dnh hudng Uvc tilp tdi tuyen de bito.Thdi gian ttl nude ddng ttwig binh tir -10 tilng va dat dinh Idioang 1- tilng Thdi gian nude xuing ttung binh tir 15 -20 tilng Nude dang nguy hilm nhit td hpp vdi thdi dilm triiu cudng 12.6 Che dg song Bd bien Nam Djnh Id mOt bd biin hd, tucmg ddi thdng theo hudng D6ng Bdc - Tdy Nam, khdng cd dao che chdn d ben ngodi, bd biin thodi va thip, dd sdng vdi dd gid dai truy6n trpc tiep vdo bd md khpng gdp vat cdn gd, gay tdc dpng manh tdi bd biSn eung nhu cdc edng ttinh bdo vp bd Ch6 dp sdng d Nam Djnh ed ede ddc diem nhu sau (xem bieu dd hoa sdng tren Hinh 4): - Vdo mua ddng, tir thdng ndm trade den thang ndm sau, song biin dii dpi hon mua he vdi nhiing sdng cd chiiu cao tir 0,8~lm va chu ky song tir 7-10 s Hudng sdng thjnh hdnh la Ddng Bde tao vdi dudng bd mpt gdc biin ddi tir 30 - 45° Vdo thang 10, thang 11, sdng ket hpp vdi triiu cudng tao muc nude uy hiep bd bien va cac cdng ttinh bdo ve bd - Vao mua He, tir thdng den thdng 8, cd rit it ngdy sdng biin dii dpi, nhimg ttong miia nay, cao bao Idn thudng xdy ra, neu bao dd bp trite tiep hoac d lan cdn thi sdng vimg bd rit Idn gay thiet hai ddng kl cho bd bien va cac cong ttinh bdo vp bd Chiiu cao sdng trang binh bien doi tir 0,65 - Im vdi chu ky ~ 7s Hudng thinh hdnh ciia sdng miia Id hudng Nam vd Ddng Nam 12.7' V$n chuyen bun cat va dieu ki^n hinh thai bcrbien Vdn chuyin btin cdt d khu vuc Nam Djnh phu thupe vdo ede ylu td dpng lue ven biin va chiu anh hudng true tiep lupng biin cdt tir cdc sdng ttong khu vuc, chd ylu la sdng Hdng Hiu hit biin cat he thdng sdng Hdng dupe dd biin qua cira song Thdi Binh, Difim Diln, Tra Ly, Ba Lat, Lach Giang, Ddy, H? Lan Bun cdt dupe bdi tich manh d cira sdng Ba Lat phia bde bd bien Hdi Hau, tiep den la t?i cira Ddy d phia nam bd biin Hdi H|u Tuy nhiSn, ciing vdi vi$c bdi tu mjinh mS thi xdi Id d bd bien Hdi H$u eung kha manh li?t Hinh 10 20 30 Bilu dd hoa song theo cac thang vung biin Nam Bjnh MAT C A T D I A C H X T Dfi Bl^N H A I THINH H A I HAU Hinh Mat cSt dja chat khu vyc Hal Hau Ldp 1: Id Idp dit ddp phdn bd ttdn dd (gpi Id Idp 1), cao dp mdt dat triing vdi mat dia hinh, cao dp ddy Idp dit Id (+0,69), ehilu ddy ldp dit thay ddi tii 0,3 din 4,1m Phdn dit nln, bao gdm cac ldp sau: Ldp 2: Ldp cat bui, cat hat nhd, mdu xam nhat, xam den, tr?ng thai rdi, bao hod nude, phdn bd rdng ttong pham vi khdo sat, cao dp mat ldp dit tir (-1,62) ddn (+0,69), cao dp ddy ldp dit va ehilu ddy chua xdc dinh dupe Ldp 3: Ldp cat pha mdu xdm nau hojc xdm den ed xen kep ldp mdng set pha Ldp 4: Ldp set pha mdu xam nau, xdm gu rit dm, chay deo vd ddi chS c6 xen kep ldp mdng cdt pha Ldp 5: Ldp set pha mdu xdm hdng xam nau, xen kpp edt pha, dit dm, deo mem vd chdt vita 14.2 Khu vyc Giao Thuy Qua kit qud khao sdt dja chit bd sung cila dl tdi cho khu vpc Giao Thdy, ciu t?o cac ldp dit ttong khu vuc nghidn ciiu bao gdm (xem thdm phdn bdo cdo dia chit bo sung khu vuc Giao Thuy): 16 Ldncdt fidp la): ddy Id Idp phdn bd hpn hpp d chdn dd phia biin, ngudn gdc bdi tu khdng thucmg xuydn Ldp dit dip than de fl.dp i: Dit ddp de phin Id cdt, cat pha mdu xdm den, xdm sdng, kdt eiu ehjt, ttang thdi bao hda nude, ddi chd chita chdt hilu co, vd sd, vd hen Ldp cd bd ddy ttimg binh 4,0-4,5m Ldp ndy gdp d tit ed cdc ho khoan d dinh dd Ldp P i t sdt pha ttan2 thdi deo mim den ddo chdv ildp Ibi: Ddt sdt pha mdu xdm nau, xdm hang, xdm den, kit ciu kdm ehjt, tt?ng thdi ddo mim din ddo chdy Ldp cd chiiu ddy khdng 6n djnh tii 0,30m din 2,0m vd ndm dudi than dd Day Id Idp ttdn ciing ciia nln dd Ldp Bat cdt pha bdo hda nude ddp 21: Ddy Id ldp cdt pha mdu xdm den, xdm hdng, kdt cau chdt, tt^g thdi bdo hda nude Ldp chi gap d cac hd khoan HKI din HK9, Idp cd bl ddy trang binh tii 5,0m-6,6m Ldp Cdt hat (ldp 3): Ldp ndy ndm dudi ldp cd be ddy tuong ddi Idn, ldp cd thdnh phdn la cdt hat mjn mdu xam xanh, xdm den, xam sang, kdt cau chat, tt^g thdi bao hoa nude chiia hiiu co Ldp ndy gap d cac hd khoan HKIO ddn HK30, ttong ldp ndy ddi chd xen kep thiu kinh Id set cd be day tir 0,7m-l,5m Ldp set (Ldp 4): Ldp la ldp cudi ciing tai eac ho khoan ttong pham vi ehilu sdu khdo sdt tii HK10-HK30 Ldp cd thdnh phdn Id dit set mdu xdm hang, xdm ghi, kit ciu kem chat, ttang thai deo chdy din deo mim ddi cho xen kep ldp edt mdng hat nhd Ldp Cdt pha ndng (ldp 5): Ldp la Idp cudi cimg tai cdc hd khoan ehilu sau khdo sat gjp tai cdc hd khoan HK1-HK9 Ldp cd thdnh phdn la cat pha ndng mau xdm den, xam hdng, kit ciu chjt, ttang thai bdo hda nude ehda htfu co Tir kit qud khdo sdt ttdn vd phdn tich cdc chi tidu co ky cua cae ldp dit d 02 khu vuc diln hinh Hdi Hdu va Giao Thdy, cd thi ddnh gid dja chit khu vpc nghien Ciiu nhu sau: + Cdc Idp dit dip than dd Id cac ldp ddt cd hp sd thim cao, thim nude manh, dd khd ndng chdng thim kem 17 + Ddt dip thdn dd cd tinh dinh kdm (cat, cdt pha) kit cau kdm chdt do de bdo xdi, khdng cd khd ndng chdng nude ttdn qua de vdo miia mua IQ, cin cd bidn phdp bdo vf tranh mat dn djnh bj bdo hda cd sdng ttdn vd ddng thim + Ndn dd tdn tpi cdc Idp dit set pha vd cdt pha mim ylu, siic khdng cdt nhd + Dosm dd khdo sat dja chit phan l(Sn ndm doi difn trpc tilp vdi biin vd cira bidn, v?y chju tdc dpng mpnh ciia sdng vd thuy tridu Ddt dip thdn de cd hf sd thdm Idn, lpc dinh nhd, dit nln dd Id ede Idp dat ydu, sdc khdng cdt be, do dd gdy mat on djnh (nhu spt, tt^pt ) cd bao vd ttilu cudng Cdn cd cdc gidi phdp gia cd dit dip dl tdng cudng 6n djnh dd cd bdo vd sdng trdn qua dd 18 CHU-CTNG B A N H G I A e i e u KI$N DIA HiNH, DjA C H A T , KHi TU-qTNG VA T H O Y H A I VAN VCiNG B I £ N H A TTNH 2.1 Gid-i thl?u chung v l viing biin Ha TTnh Bd bien Hd TInh keo ddi tii ciia sdng Lam din Ddo Ngang Id mpt ddi bd biin phdng, dja hinh them luc dja hrong ddi don gidn vdi cdc djmg tich liln chau thi, thoai din tir bd khoi Nhin chung bai biin tinh Hd Tinh h?p vd thap khdng cd vat cdn che chdn Chiiu rfng bdi ttung binh tir (100 ~150m) c6 noi khdng cd bdi biin, biin tiln sdt chdn dd (Ky Hdi, Ky Hd, ) Cao dp trang binh (0.00 - -0.50), ca bift ed noi cao ttmh bdi dudi (-1.00) Mpt thpc tr?ng ma chiing ta phdi quan tam Id rimg cdy phong hp chdn sdng ngodi de, mpt so tuyIn dd trpc difn vdi biin va ciia sdng d Hd Tinh khong cd rtaig chdn sdng vi th6 nhudng bdi dit cat khdng phii hpp cho sii vet phdt ttiln MOt sd tuydn nhu dd biin HOi Thing - Nghi Xuan thi bd biin bj s?it Id, bai thodi, biin lin sau vao dat lidn De biin khu vuc eiia sdng Cdm Nhupng, Cim LTnh, huyfn Cdm Xuydn nhiing ndm gan day dang sat Id nghidm trpng Id nhiing thue ttang dang bao ddng ddi vdi cdc tuydn dd ven biin Cdc hoat dpng khai hoang lin biin, thuy lpi, khai thae sa khoang, vat lifu xay dung, vdt lieu lam mudi, chat phd ring ngpp man, nudi ttdng thuy hdi san diln d kha nhilu noi, mang tinh chit phd bien cd the gay xdi Id nghiem trpng 2.2 Banh gia dilu kien tu-yng thuy hai van 2.2.1 Nlya Ha TTnh cd lupng mua nam khd phong phil, lupng mua trang binh ndm dat hi 2300~3000mm Nhiing viing mua Idn nhu Ky Lac, Ky Anh lupng mua dat 3.200mm Nhihig tam mua Idn thupng ngudn sdng Ngdn Phd, Ngan Sdu, Rdo Trd, Hodnh Son c6 ndm lupng mua ndm dat 4.586mm ndm 1978 d Bdu Nude, 4.386mm tai KJ- Anh ndm 1990,4.450mm ndm 1990 tai K^ L?c 19 ^ Miia mua bit diu tir thdng VIII din thdng XI Tuy nhidn thdng V, VI cd mua Tieu mdn gdy lu Tilu mdn Lupng mua miia mua d^it 65 4- 70% lupng mua ndm, cdn l^i 14 mua khO Cudng dp mua: Lupng mua bdo gdy ndn rit Idn, lupng mua mOt ngdy Idn nhit dupe 5I9mm (1984) tai Ky Anh, 510mm t?i K^ L^e, 760mm tai Bdu Nude Tdng lupng mua ba ngdy Idn nhit dpt 1.175mm t?i Ky Anh, 1.008mm tpi Ky Lpc ndm 1985, 1680mm ndm 1978 t?i Bdu Nude Nguydn nhdn gdy mua Idn bdo kit hpp vdi dp thdp nhift ddi gay ndn hoje bdo dO bp trpc tilp vdo, Nhirng ndm mua lii Idn vimg la ede ndm 1964, 1978, 1985, 1990 vd nam 2002 Ndm 2002 lu djc bift Idn xdy vdo thdng IX tren sdng Ngdn Phd, Ngan Sdu cd siic tdn pha njng nd vd ngudi vd cua edi ciia nhdn dan ttong vimg - Cd thd nhdn xdt rdng ehi dO mua lu tten sdng vd ven biin Hd Tinh la dieu kif n bdt Ipi cho cdng tdc xdy dpng dd dilu 2.2.2 Dong chay song MOt ddc dilm quan ttpng cda dilu kifn thily hdi vdn khu vpc biin Hd Tinh Id dnh hudng chi phdi cua dong chdy ttdn cdc sdng, dac bift Id vd miia lii 2.2.2.1 Ddng chay nam Ddng chdy nam trdn todn viing nghien ciiu dat 11,6.10%' tucmg ung vdi modun ddng chdy nam trang binh 60,81/s.km^ Tuy nhidn phdn phdi ddng chdy ndm khOng ddu theo khdng gian vd thdi gian - Vimg luu vuc sOng Ngdn Sdu: Luu lupng trang binh nam dat 125m'/s vdi modun ddng chdy nam trang binh Id 66,51/s.km Trdn sdng Ngdn Phd t?i Son Difm, ddng chdy ndm trang binh dat l,7m'/s vdi modun ddng chdy trang binh nam la 65,41/s.km - Luu vuc sdng Rao Cdi tpi Kd Gd, ddng chdy ndm ttung binh djt 13,7mVs vdi modun ddng chdy ndm trung binh Id 59,81/s.km - Trdn sdng Rdo Trd, tai Tdn Ldm ddng chay ndm trang binh dat 37,lmVs vdi modung ddng chdy nam trang binh Id 75,11/s.km 20 Phdn phdi ddng chdy ttong ndm khdng ddu, t?p ttung vdo miia lu tir thdng IX ddn thdng XI chilm 55-60% ddng chay ndm Mda kift kdo ddi tir thdng XIUVIII Ba thdng mdu kift 01, IV, V chilm 5-6% lupng ddng chdy ndm - Trong cdc hf thing sdng viing Hd Tinh, hf thing sdng La cd tong lupng ddng chdy Idn T6ng lupng ddng chdy sdng La vdi F = 3.210km' chilm 6,69.10V, hf thdng sdng Rao Trd chilm l,17.10'm' Tdng lupng nude cua cd hai sdng chidm 7,86 l o W chilm 67,8% tdng ngudn nude todn viing, difn tich luu vpc chilm 61,1% difn tich toan tinh 2.2.2.2 Ddng chay lu Do dnh hudng cila mua lu Idn, hf thdng sung sudi ngdn va die, lu d trdn cac hf thdng sdng xdy rat dc lift Sd lieu quan trie luu lupng lu cho thiy modun lu Ion nhat dpt 6m3/s.km2, d cdc spng sudi nho nhu sdng Rao Cdi tai Kd Gd Qmax = 1.430m3/s, Mmax = 6,2m3/s.km2 ngdy 5/X/1963, Qmax = 5.910m3/s, Mmax = 11,9 m3/s.km2 30/VIII/1975 tpi Tan Lam sdng Rdo Trd Nhu vdy ttong thilt kd vd xay dung de bidn ddc biet d vimg cda sdng d khu vpc Hd TTnh can het su:c luu y ddc thii cua ddng chdy lu ttdn cae eon sdng Tuyen xay dung de vd kit ciu dd phdi dupe nghidn ciiu dd khdng lam dnh hudng ddn khd ndng thodt lu cua cdc sdng, ddng thdi ddm bdo dilu kien an toan dn djnh ttong didu kifn sdng bao tir phia biin vd ddng lu trdn sdng 2.2.3 Baonhmd&i Vimg bien Hd TTiih cQng gdnh ehiu mdt cudng xudt bdo gin tuong ducmg nhu vimg bien Nam Dinh Bang cho thiy co 49 bao dd bd true tilp hoac dnh hudng din vimg biin Ha TTnh tii 1972 din Bang Cdc ccn bdo dnh hudng tdi Ha TTnh tir 1972 din TT NSm Ten bao 1972 1974 DINAN Nai bp Cap gio (toe dO) CIO 33 Thdi Binh Thai gian bg Vade +14/6 19/6 1975 ATND 40 1976 ALISE 40 20/9 1977 SARAH 31 21/9 21 cac s\r C O 1979 ATND 24 10+11/8 1980 ATND 24 30+31/8 ATND 38 12+16/9 ROY 35 2+10/8 WARREN 32 16 +20/8 >40 27/9+1/10 07 28 21/6 25/8 S 1981 10 11 1983 GEORGIA 12 1985 1985 ATND ATND S69 Nghf tinh 012 21/10 1986 1986 S63 ATND Thanh Hoa C8-9 21/7 34 12/8 S65 Thdi Binh Oil 6/9 So PAT 31 23/10 25/5 13 14 15 16 17 18 19 1987 1988 20 1989 Hai ma vsde S6 DOT 34 So FA YE 21 VSde 35 11/7 22 1990 S6 10 MIKE 31 18/11 23 1991 So ZEKE 26 14/7 24 1994 31/7 So Thanh Hod 08 Sis Thanh Hod 08 13/9 ATND Thanh Hoa 06 29/7 27 So Thanh Hoa 28 So 12 VSde Thanh Hoa 25 26 1995 29/8 24/7 So Giao thuy Oil 30 apthap Ninh Binh 08 15/8 31 So Thanh Hoa on 23/8 29 32 1996 Thanh Hoa 14/9 Thanh Hoa 5/10 Sl9 36 37 38 2003 Ha TTnh Ha TTnh Binh Dinh 09 9/10 CIO 12/11 2002 39 Qudng Binh So 2000 So S65 34 35 ATND ATND 1998 33 QudngNinh 41 09 Nam Djnh So ATND 42 43 2004 S6 25/8 9/9 12/6 Binh Djnh ATND 27/7 ClO-cU 06-07 So 40 Quang Ngai 06-07 22 19/9 V9d8 44 sl2 Nam Dinh 45 S63 Thanh Hod 46 So Ngh? An 47 So Ngh^an 48 So Damrey Nam Djnh 49 So , Sstlor TH-ND 2005 OIO-CU 31/7 11/8 31/8 09-010 18/9 012 27/9 vade 2.2.4 Thuy triiu Hd Tinh ndm ttong vimg cd chi df nhjt ttilu khdng ddu Hdng thdng cd non nua s6 ngdy ed lin nude Idn vd lin nude rdng Thdi gian ttilu ddng 10 gid, trieu riit tir 15 - 17 gid Thiiy ttilu qua cua Hpi, cda Sdt, cira Nhupng, cda Khau ddttTiyInvdo sdu ttong sOng nfi dia nhu sdng Cd, La, Nghen, Rdo Cdi, Rac, Kinh, Quydn, Sdng Tri Bidn dO ttilu trayln vdo sdng giam ddn tir cira sdng vao ndi dja Vdo mda lu dnh hudng cda ngudn nude lu cdc sdng sudi dd vd, thiiy trieu diy gdn biin hon Nhihig ngdy lu idn d cdc vj tri dnh hudng cua triiu xa nhit so vdi biin khdng cdn dao dOng thiiy ttilu + T?i Linh Cdm: Mpc nude ttilu trang binh Idn nhdt tir thdng IV dao dpng tir 1,28 m din 1,52m, tt^ing binh nhd nhit (-0,7m), mue nude nhd nhdt dat -0,88m + Trdn sdng Nghen: Muc nude triiu nhd nhdt -1,2m (30/VII/1988) tai Hp BO + Tai c i m Nhupng: Muc nude ttilu mua kift nam 2,82m (29/VIII/1990) vd miic nhd nhit -1,28m (12/VII/1995) + Tpi Trung Luong ttdn sdng Cd: Muc nude triiu thip nhit -L34m, muc nude cao nhit miia lu 7,0m (IX/1978) 2.2.5 Nuvc dSng Biin Ha TTnh thupe eung 15m ciia dia hmh thim lue Biin Ddng, didu kifn dja hinh dac bift ndy md chidu eao nude dang d vimg biin Hd TTnh ttong bao cd thi rit Idn Theo kit qud nghidn ciiu vd quan ttdc nude ddng eda Vif n Co hpe Vift Nam thi Hd TTnh Id khu vuc nguy hilm nhit vl anh hudng cua nude ddng, chiiu cao nude dang Idn nhit c6 thi xdy d cd thi len tdi 3,2 m 23 Nhu vdy nude ddng eao ttong bdo kit hpp vdi trieu cudng va sdng bdo ed thi gdy tdc dfng bit Ipi vdi hf thing dd biin Hd Tinh Trong lich sit dd xdy nhilu lan vO de nude ttdn vd sdng trdn gay 2.2.6 Dong chay biin cit Hdm lupng bun cdt ttung binh nhieu ndm 87g/s tai Son Difm, 120g/s tpi Hda Duyft Tdng lupng biin cdt lo liing d?t 151.106 tin/ndm t^ii Son Difm, 486.106 tin/ndm tai Hdo Duyft, 39,4.106 tin/ndm tji Kd Gd Hf sd xdm thpc dpt 191 tdn/km2.nam tpi Son Difm, 258 tin/km2.ndm tai Hda Duyft, 163 tin/kni2.ndm tai Kd GO Nhm chung xu thi v ^ chuyin bim cdt dpc bd trang binh ndm Id tir bdc xudng nam, toe dp xdm thpc bd biin Hd TTnh d mirc df trang binh ylu 2.3 Banh gU dilu kipn dja hinh bo' biin vd de biin Ha Tinh TuyIn dd biin tinh Hd TTnh dupe hinh thdnh cdch ddy khodng 250 nam ~ 300 ndm TuyIn dd biin c6 nhifm vp bdo vf tinh mpig 357.602 ngudi, 26.316ha dat nOng nghifp vd nudi ttdng thuy sdn cda gdn 90 xd ven biin, ven ciia song thupe huyfn, thi xd cQng nhu bdo vd tdi sdn, viing san xuat, khu kinh tl trpng dilm, an todn quOc phdng cua cd tinh cp thi Huyfn Nghi Xuan cd tuyIn vdi chidu ddi 31,71km, bdo vf 62.610 ngudi, 3.824ha dit ndng nghifp vd nudi ttdng thuy sdn Huyfn Can LOc cd tuydn vdi ehilu dai 42,5km, bao vf 43.308 ngudi, 3.604 dit ndng nghifp vd nudi trdng thuy sdn Huyfn Thach Hd cd tuyIn vdi ehilu dai 55,0km, bao vf 89.943 ngudi, 6.476ha dit ndng nghifp vd nudi ttdng thuy sdn Thi xa Ha Tinh cd tuyIn vdi chidu ddi 42,7km, bao vf 67.104 nguiri, 5.630ha dit ndng nghifp vd nudi trdng thuy san Huyfn Cdm Xuydn ed tuyIn vdi chiiu ddi 50,93km, bdo vd 48.092 ngudi, 2.759ha ddt ndng nghifp vd nudi ttdng thuy sdn Huyfn KJ- Anh cd ttiydn vdi chidu ddi 59,14km, bdo vf 46.545 ngudi, 3.908ha dit nong nghifp va nudi ttdng thuy san Tdng chidu dai tuyIn dd bien Hd Tinh Id 272,7km 24 Dd bidn Ha TTnh chpy theo hudng Bdc - Nam vi v$y ttong thdi k^ miia mua hay miia khd, diu cd sp cd gid mda Ddng Bdc hay gid miia DOng Nam - Cdc do?n dd d vimg cda sdng: Than dd chii ylu dupe ddp bdng dat thjt, dit pha cdt quy mO nhd vd thip phia ngodi sOng cd bdi bli nhung cao ttinh mdt bdi thip tir (0.00 - +0.30) Khi thuy ttilu Idn hdu hit bai bj ngdp sdu nude biin trpc tilp tdc dOng vdo thdn dd, g?ip bdo Idn, sdng biin trdn qua mjt dd Cao trinh dd (+3,60 ~ +3,80), chidu rOng mjt de (3,30- 4,00m), hf s6 mdi m^ = 1,5 -2,5m; mj = 1,0-1,5 - Cac dopn dd U^c difn vdi biin: Thdn dd chd ylu ddp bdng dit thjt pha edt, mjt cit ngang mft s6 do?n nhd, cao ttinh dinh thip vd bj s?t Id Cao trinh dd phi bien d cao ttinh +3,5 ~ +3,8 m Dja hinh bdi ttudc dd khd thip cao trinh tii -0,5 ddn -1,0 m vd hpp W xdi mdn lidn tpe, thuy triiu xudng bdi rOng tnmg binh 100-150m, nhilu dopn khdng cdn bdi Khi thuy ttilu len bdi bj ngsip sdu, sdng vd ddng chdy ven bd thuimg xuydn tdc dfng ttpc tilp vdo dd gdy xdi, sat id mdi, nghidm ttpng nhit Id cd bdo vdo hojc nhiing gid miia Ddng Bdc Khu vuc ven biin tinh Hd TTnh ed bd biin la viing tich tu mdi mdn, hep, die, thodi vd ttai ddi, nhilu bd cat Dudng bd d day it co biin dpng Idn Xdi Id vd boi xen kd Qua thing kd ede doan xdi Id cho thiy Ha TTnh cd 11 dilm xdi Id Qud trinh xdi Id bd diin vdi tie dO khdc Khu vuc cd cac dia hinh rang cua, khiic k h u ^ , da gdc vd cdc vimg cua sdng, hifn tupng xdi Id diln vdi qui md nhd, cudng dp ydu ddn trang binh Khu vpc bj xdi Id manh nhit d bd bidn cat cd hinh eung lOi, chju tdc dOng ttvc tidp cua sdng Bang thing kd mdt sd su kifn vd didn biin hhih thai xdi bdi eiia khu vuc Bang Hifn tr^ng xoi Id bd biin Ha Tinh Bia dank Nam xdy raxdi STT huyfn xd Nghi xuan Xudn Lidn Vjtri So do^n b} xdi Id Xuan Hpi Chiiu ddi bi xdi (km) Toe dp xdi Id trung hinh (m/nam) Bd Bien 2.6 3.36 Bd Bien 1989 19642000 1964 Toan doan 3.0 19.4 Ciia Hoi 25 CiDam Xudn Ydn Bd Bien Bo biin Cila s&ng Lam 1989 1985 2.2 2.7 Xuan Tradng 1965 Bdbiln 1.8 Xudn Dan 19661967 Bd Bien 2.1 Xuan Thdnh 1982 Bd Bien 10 1982 11 12 13 Thaeh Hd 14 15 16 Cam Xuydn 17 18 19 20 21 22 Lach ddo Bd bien Bd biin KyAnh Xudn Vdn Xudn Hdi Thgch Vdn Cdm Hod Cdm Nhupng Cam LTnh Cam Duong KyNam Ky Xudn KyLpi KyLinh Ky Phuang 1982 2.5 50 5.5 0.2 0.15 Bd bien 2.0 Bd biin 2.5 30 Bd biin 1.5 1.2 Bd bien Bd bidn Bd bien Todnbg 3 3.2 40 10.5 12.2 6.7 Bd bidn 7.5 0.2 Bd bien 7.0 3.8 1998 Bd bien 1995 Bd bien 1999 1970 1999 1997 1980 19901992 1991nay 7.4 5.5 18.6 2.4 Banh giii dilu kien dja chit nln vimg xay du-ng de bien Ha Tinh Kit qud khao sdt dia chit bo sung cho 02 khu vuc didn hinh: dd bien Hpi Thing huyfn Nghi Xuan vd dd Thach Hd huyfn Lfc Hd dupe torn tdt va danh gid sau ddy (xem thdm cac bdo cdo khdo sdt dia chdt tuong iing): 2.4.1 De bien Hgl Thong- Nghi Xuan Lap la: B i t ddp dd cd thdnh phin Id dit sdt pha, mdu xam ndu, xdm ghi, kit ciu chdt, ttpng thdi niia cimg din ddo ciing Ldp cd ehilu ddy tii 2,40m din 3,50m Ldp ndy chu ylu phdn bO tai cdc hO khoan HK2, HKj, HKj, HKn, HKn, HKn 26 Ldp 2: Dat dip sdt pha, ttang thdi ddo mim; Dat sdt pha mdu xam den, xdm ghi, ket cau chdt vira, tt?ng thdi ddo mim Ldp cd chidu day tir 2,40m ddn 3,50m Ldp ndy chii ylu phdn bd d tit cd cdc hd khoan Ldp 3: Cat hpt vita din hpt nhd: Ddy Id ldp cuOi ciing ttong ehilu sdu khdo sdt Thanh phan Id cdt h^t vira din h^t nhd, mdu xdm den, kdt ciu chdt, trang thdi bdo hod nude, ddi chd xen kpp ldp sdt pha mdng Qua dd cd thi cd mpt sd nhdn xdt sau: * Khi xdy dpng cdng ttinh ttong khu vpc ndy cdn ehi y hifn tupng tham qua ndn, hifn tupng nude vd cdt chdy vdo h i mdng * Khi xdy dpng cdng ttinh cd tdi ttpng khd idn cdn chu y din vide xir ly nhimg vimg Idp 2,3 vd a ndm gin bd mdt dat * c i n chu y xir ly nln dl ttdnh hifn tupng xdi ngdm cd chenh cot nude • Dopn dd khdo sdt dja chit phdn Idn ndm dOi difn true tilp vdi biin vd ciia biin, v|iy chiu tac dpng mpnh cila sdng vd thuy ttidu Dat dap than dd ed he sd thim Idn, luc dinh nhO, ddt nln dd Id eac ldp ddt ydu, sire khdng cdt be, do de gdy mit dn djnh (nhu sat, ttupt ) cd bdo vd ttidu cudng Can ed eac giai phdp O gia C dit dip dl tdng cucmg dn djnh dd cd bao vd song tran qua de 2.4.2 Be Thach Ha - huyen Lgc Ha Lav 1: Cdt hat nhd: Cdt hat nhd, mdu xam hdng, xdm vang, kit ciu chpt, trang thdi bdo hda nude, chiia vd sd, dc hin Ldp cd chidu day tir 1,0m den 2,0m Ldp 2: Dit cdt pha: Ddt cdt pha, mau xdm vdng, xam sdng, ket cau chat, trang thai bdo hda nude Ldp cd chidu ddy tir 2,0m ddn 3,4m Ldp 3: Cat hat vira din hat nhd: Ddy la ldp cudi cimg chidu sdu khdo sat Thdnh phdn la cdt hat nhd din hat vira, mdu xdm hdng, xdm vdng, kdt ciu chat, ttang thdi bdo hda nude, chua vd sd, 6c hen Tir kit qud chiing ta c6 nhjn xdt sau: dia chdt nln de d ddy thufc loai ydu vd cudng dp vd chOng thim Cdn chd y hien tupng tt:upt Id mdi, nude vd cdt chdy vdo hd mdng cdt vdo ldp vd Chd y hifn tupng dim sui cd chdnh cdt nude idn Vat lifu dit ddp thdn dd ehu ylu Id cdt, cdt pha do cdn chii y xdi vd dd cd nude trdn qua Cdn cd bif n phdp bdo vf mai dd luu chdng sdng trdn 27 CHU'ONG K £ T LUAN Qua phdn tich ddnh gid tdi lifu ciia hai khu vpc ttpng dilm Nam Djnh vd Ha Tinh, chiing ta cd thi rdt mft s l kit lupn chung nhu sau: Ve dieu kifn tupng thily hdi vdn thi cd hai viing biin dfu chju dnh hudng ciia gid miia DOng Bdc vd Tdy Nam vd diu ndm I bdo vdi tin suit chju dnh hudng thudng xuyen ciia bdo vd dp thip nhift ddi Do dilu kifn dia hinh bai trade dd khd thip d cd hai vimg, ttong dilu kifn bdo kit hpp vdi trieu cudng thi df sau nude trade de khd Idn, sdng dd cd thi tiln sdu hon vdo bd va tdc dOng trpc tilp gdy nguy hilm cho dd Sp tdc dOng ttrpc tilp ndy ngdy cdng trd nen trim trpng ban tai lifu dieu tta hinh thdi cho thdy bd biin d ea hai vimg dang xdy hifn tupng bien lan vdi tdc dp xdi bd tir bung binh din manh Bdi de dang ngdy mft hi thu hpp vd ttd ndn sdu hon ddn tdi sp thay doi ddng kl vd dilu kifn thiiy hdi van thilt k l dd (vi dp nhu chieu cao sdng thilt k l trade chan dd dang mft tdng Idn) Do yeu tO dja hinh vd muc dp hopt dpng cao ciia bao, chidu cao nude dang ttong bdo cd the xdy d cd hai vimg la Idn, ridng d Hd TTnh cd thi Idn tdi ttdn 3,0 m Tdi lieu khdo sdt dia hinh dd cdn cho thiy hifn trang dinh de cdn dang d mile thip, biin tir cao trinh 3,50 - 4,50 m, rit it noi dat cao trinh 5,50 m Nhu vay ed thi kit luan rdng lupng sdng trdn qua dd dilu kien bao la khd Idn vd theo ude tinh (theo phuong phdp ciia TAW-2002) thi lim lupng trdn trang binh qua de cd thd d miic 50 - > 1001/s/m theo vi tri va cap dp bdo Kdt qua khdo sat dia chit dd yd ndn dd khu vuc biin hai vimg trpng dilm cdn cho thiy dit ddp than dd cd tinh dinh kdm (cat, cat pha) kit ciu kdm chat dd dl bdo xdi, khdng cd khd ndng chdng nude ttdn qua dd vdo miia mua 10, can c6 hifn phap bio vf ttdnh mit On djnh bi bdo hda cd sdng trdn vd ddng thim Trong dd dit nln dd d nhilu chO Id cac Idp dit ylu, siic khdng cit bd, do de gay mdt dn djnh (nhu spt, ttirpt ) cd bao vd ttilu cudng Nhu vpy vdi luu lupng ttdn qua dd Idn nhu hifn tai va dilu kifn dja chat ddt dip than dd vd ndn dd cd tinh thim cao, siic khang cdt bd, thi cdn co nhiing gidi 28 phdp hifu qua nhdm ddm bdo dinh vd mdi phia dd dupe bdo vf mpt cdch hifu qua, khdng bj mit dn djnh cd sdng ttdn qua bdo Tai lifu tham khao Trjnh Minh Thp, 2009 Cdc thuylt minh bdo cdo dja chit khu vpc trpng ylu Nam Djnh vd Ha Tinh Vii Vdn Nam vd Phiing Xuan Difp, 2008 Cdc thuylt minh bdo cao dja hinh khu vpc ttpng ylu Nam Djnh vd Ha TTnh TAW, 2002 Technical report wave run-up and wave overtopping at dikes Technical Advisory Committee on Flood Defence, The Netherlands 29 ... chdy qua : Sdng Hdng chay qua Nam Djnh vdi chieu dai xdp xi 70 km, biin Ddng qua cua Ba Lat Sdng Ninh Co ddi 60 km la chi luu bd httu cda song Hdng, phan luu tai cila Mom Rd, dd biin Ddng qua. ..BO KHOA HOC VA CONG NGH$ CHirONG TRINH KHCN CAP NHA NUQfC KC 08/06-10 D£ TAI: "Nghien citu ca s& khoa hgc vd de xuat cdc gidi phap khoa hoc cong nghe bdo ddm sif on... t^i nga ba Dpc Bp, sdng Day chdy qua Nam Dinh vdi ehilu dai gdn 80 km, bien qua cda Ddy Sdng Sd la nhanh sdng nhd nhan nude tir cuoi Sdng Hdng thdng biin Ddng qua cira Ha Lan Hai Hau Id mdt huyen