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• X dVl cbaZYXWVUTSRQPONMLKJIHGFEDCBA N ~1H D N O , flH ~ lOv,W N 3v A f l D N I V ~ , • dVl N3AfU ~ VA V ltN K H O A H Q C v A C O N G N G H t v ItT V I~ N HAl DUONG ,,? NAM HQC· " TUYENTAP ONMLKJIHGFEDCBA cbaZYXWVUTSRQPONMLKJIHGFEDCBA TArNG'UYEN "' A .•• ~ VA MOl TRUONG BIEN T~PX B a n b ie n t~ p : T ru d n g P G S , T S N guyen ban: 'I'h tr k y : V an T i~ n T S N g u y en H uy Y ~t T S N guyen D ue C u T S N guyen H uu C li C a c tb a n h v ie rn T S L uu V an D i~ u T S T rlln D ue T h~ nh T S D b C ong T M N H A X U A T B A N K H O A H Q C vA lIT T H U A T H A N or - 2003 T , N H ;, r e s u lt s of ± % , ,C d , MVC Ll)C A s, ± T ran g - L ei n i d fiu k d e s ig n , n arn h o at d o n g v a p h at tri~ n cu a P h an v ien H d u o n g h C tai H P h o n g (1 9 - 0 ) ~ Q A /Q C N g u y in la r e h ig h t C o astal E ro sio n an d S ed im en tatio n V a n T ie n in V ietn am 20 T r a n D u e T h a n h , P h a m H u y T ie n , B ui H ong Long, N guyen V an C u R esearch es in E stu arin e E n v iro n m en t O v erv iew o n A ctiv ities an d R esu lts an d E co sy stem o f R ed R iv er: A n 34 T r a n D u e T h a n h cbaZYXWVUTSRQPONM G eo lo g ical E n v iro n m en t o f th e T ien y en - H aco i B ay 54 N guyen H uu C u, N guyen N goe, T ran D ue T hanh, D in h V a n H u y , N g u y e n Q u a n g T u a n , N guyen V u Tuan, N guyen Thi P huong H oa, N g u y e n T h i K im A n h , D a n g H o a i N h o n S tu d ies o n S eaw eed s in V ietn am 67 N g u y e n V a n T ie n , N g u y e n H u u D a i R esearch es in D istrib u tio n o f V ietn am ese S eag rasses 76 N g u y e n V a n T ie n C au tru e v a tie'n h o a d ia ch at v u n g b b i y en b i~ n N g h ia H u n g N g u y e n H iiu C ll, T r titi D u e T h a n h , N g u y e n Q u a n g T u r in , D iin g N g u y in N g u y in T h i K im A n h , B u i 89 va T u r in , Hoai Nhan, V a n Yumig D ac tru n g h in h th - d o n g lu c v a b ien d an g b o H H au , N am D in h Dinh 106 V a n H u y , D D in h C h ie n , T r iin D u e T h a n h , B u i V a n V z i< ;J n g M o t su u t?-p h o a th ach tru n g 16 ( F o r a m i n i f e r a ) M io x en m u o n it d u o c b iet d e'n ONMLKJIHGFEDCBA d k h u Y I;iCb n tram tich D ~ tam y en b i~ n D n g H d i (Q u an g B in h ) N g u y in N g o c , N g u y in Hiiu 126 C ll B u d c d fiu d an h g ia tac d o n g cu a h H o a B in h d i v d i n g u o n lei ca b i~ n y en b o 139 T r t i n D u e T h C J - n hD, D i n h C h i e n 1 K h a n an g tac d e)n g cu a m o t so ' h in h th irc n u o i th u y san d e'n m i tru o n g v u n g b i~ n y en b o H P h o n g 161 L u u V a n D ie u , H ien tran g , x u th e' b ien d i m o i tru o n g d ia h o a tram tich d fim n u i t~ i 171 v u n g y en b i~ n H P h o n g N g u y in Thi Thu nu« N g u y in M o t so ' d § n lieu v g an h h u o n g cu a cac m uoi d in h d u d n g ( P v d i m at d e) te' b ao q u an x ii th u c v at p h u d u tai v in h H ~ L o n g N g u y in T h i M i n h Huyen, C h u V a n T h u o c , D ue C u -, N O ;) d i va Thi Luu 182 349 T u y e " n U jp T a i n g u y e n v a M i tr u a n g b iln T i i p fedcbaZYXWVU X CAU TRUC VA TIEN HOAwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIH f)~A CHAT " _ A ' ,,:J _ VUNG BAI BOI VEN BIEN NGHIA HUNG N g u y in IN g u y in H i t u WVUTSRQPONMLKJIHGFEDCBA C a , T r iin D u e T h q ,n h , V u T u a n l, N g u y in D ij,n g H o a t N h a n , N g u y in Q uang T h ! K im Bui Van rc s-; Anh, V U !1 n g MO DAD Huyeri Nghia Hung, dia phan cue nam cua tinh Nam Dinh, narn giua song Ninh Co (d phia dong bac) va song Day (d phia tay nam), co vung bai b6i ven bi~n rong IOn La bQ phan cau true quan cua vung cua Lai Giang (cira song Ninh Co) va vung cua Day, bai b6i co tiern nang to IOn ph at tri~n kinh te - xa hQi khu vue Vung cua Day va vung cua Ba Lat Ia hai vung cira song co bai b6i IOn nhat va toc dQ b6i Ian ve phia bi~n cling IOn nhat cua chau th6 song Hting hien dai Theo dong lich slt chinh phuc vung dat mdi, cac bai b6i chau th6 song H6ng luon la doi tuong khai hoang, chiern cu qua nhieu the h~ lam noi sinh va tao dung cac co sd san xuat nong nghiep, ngu nghiep hay diem nghiep Huyen Nghia Hung cling co lich slt khai hoang Ian bien lau ddi va nhu cau slt dung bai b6i ven bi~n van tiep tuc gia tang Tuy nhien, slt dung hop ly cac bai b6i d~ cho hieu qua kinh te cao dang thach thuc moi n6 luc khao sat, nghien cuu ban chat tv nhien va danh gia tiern nang Slt dung D~ gap them co sd khoa hoc cho dinh huang slt dung hop ly bai b6i ven bi~n Nghia Hung, bai viet cung cap tu lieu cu th~ ve phan va cau true tr:1m tich, danh gia dQng luc phat trien va tien hoa moi trucng tram tich vung bai b6i ven bi~n va dUQChoan voi su h6 tro cua HQi d6ng Khoa h9C tv nhien narn 2003 c o s o T A l LI~D v A Tai lieu chu yeu P H U 'd N G PHAp d~ xay dung bai viet la ket qua nghien cuu cua Phan vien Hai duong h9C tai Hai Phong thoi gian 2000 - 2003 [2, 3, 6, 7, 8] thuoc 89ZYXWVUTSRQPO t g p WVUTSRQPONMLKJIHGFEDCBA T 'a i n g u y e n v a M i t r u o n g b iin T u y in cac de tai khac T tip X ma cac tac gia dil true tiep tham gia Tren co sa phuong phap luan tiep can h~ thong dong luc moi truong dia chat, khu vue nghien cuu duoc xem la mot bi? phan cau chau th6 song Hong hien dai noi chung hay cua vung cua song Ninh Co - cua Day noi rieng T H A N H PH A N vA C A U T R U C T R A M T ic H bo T h a n h wvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA phan cd hoc t r i i m t i c h fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA v a phan ZYXWVUTSRQPONMLKJIHGFEDCBA Tram tich tang mat bai b6i va suon bo ngarn bao g6m: cat nho, bot ldn, bun bot nho va bun set bi?t (hinh 1) Cat nho co duong kinh trung binh - Cat nho mm, chon 19C tot vdi di? chon 19C (S o ) khoang 0,102 - 0,131 (M d ) khoang 1,250 - 1,592 va di? lech khoang 0,791 - 1,000 Cat nho co mau xarn, l§.n mica va manh (S k ) voi va Y I;m sinh vat (chu yeu la Than mern), phan bo lien tuc tu cua Lai Giang (Nghia Phuc) qua C6n Vinh, C6n Xanh va C6n Mo toi tan cua Day a khoang di? cao tir duoi Om hai d6 tdi tren muc biJn trung binh a dudi suon bo ngam tdi di? sau - 3m, cat nho ciing xu at hien cac dai nho, hep khong lien tuc va song song vdi duong be • BOt Ia n Bot IOn co duong 0,058 - 0,095 mm, chon 19C tuong 1,262 - 1,930 va di? lech Sk kinh trung binh Md doi tot vdi di? chon 19C SO khoang rong khoang khoang 0,212 - 1,096 Bot IOn co mau xarn nau, doi ch6 l§.n va voi sinh vat, co dien phan bo IOn thu hai sau bun bot nho, tao dai lien tuc tu cua Lai Giang bao quanh C6n Xanh, C6n Mo tdi cua Day, a khoang di? sau - 2m tdi di? cao muc biJn trung binh o nhieu ch6, bi?t IOn tao be mat tuong doi bang phang, rat thuan loi cho nuoi Ngao • Bun trung binh bO t Md nho Bun bi?t nho mau nau do, tuong doi deo, co duong' kinh hat khoang 0,015 - 0,047 mm, chon 19C tir tot tdi trung binh di? chon 19C khoang 1,151 - 3,159 va di? lech Sk Bun bi?t nho co dien phan bo IOn nhat nhung chu trung binh tao vdi khoang 0,604 - 1,528 yeu a di? cao tren muc biJn bai tr ieu cao tU de N am Dien tci glin C6n Mo, a long song Day va suon bd ngam phia ngoai o bai tr ieu cao, loai tram tich dang tham gia vao qua trinh lay hoa vdi vai tro quan cua thuc vat ngap man • Bun set khoang b o t Bun set bot mau nau do, deo co duong kinh trung binh 0,009 - 0,010 mm, chon khoang 2,434 - 3,315 va di? lech Sk 19C trung binh vdi di? chon 19C SO Md hong khoang 0,728 - 1,645 Bun set bot co kich thuoc g:in vdi gidi han cap hat cua tram tich bun bot nho va co dien phan bo rat 90 T u y ln nho d long song Day va nhu v~y it tijp rat nguyen v a M i tr u e in g b iln T ijp X co y nghia ph an anh tinh ph an di cua tram tich C H U G IA I • Cat nho, - B t Io n - V i tri k h o a n - Oui1ng 0,0 m h a i d o , 1200 Om 1 _ : - Bun b9t nhc ta y , s o h i~ u v a ••••' _ m at dt X a N g h ia P h u c - D e , bo d a m 1200 ••••• _ , X a N a m wvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Oi€ln ZYXWVUTSRQPONMLKJIHGFEDCBA ;., o ;., ng Iuc moi tru'ong tr.lm tich WVUTSRQPONMLKJIHGFEDCBA D (m g Nhu lu c n { J i s in h da neu, moi truong tren ddi nang yeu tan Nhu tich bai b6i yen bi~n kien tao va kien vay toc di? nang vao khoang thuan loi cho qua trinh day tram tich tram tao hien dai voi bien 0,01 mm/nam, b6i tu Ian tien nhanh IOn nhu phu ki~u Nghia Hung di? tren duoi 300m Day la mot ve phia bi~n ph at tri~n nhirng yeu to vi khong tao be thay moi truong tram tich bai b6i phat tri~n tren ddi sut Trong gay pha qua trinh huy, Lai Giang, Day Richter d9C theo nguyen huang la dirt nghien yeu, ddi chiu anh cuu narn tay bac - dong nam, tay bac - dong nam - tay nam dong bac dong nang d6 vung dinh huang cua Day, dinh song van Tuong gay sinh duong nhan bo Hai Hau - Nghia g§'y song Day c:1t qua cua dut g§'y song Da truot phai, ciit qua dut vdi cac chan (Hoa Lu) tdi 4,6 - 5,0 di? Richter dut cua cac dirt va dut g§'y cua Day - Van Ly dinh tv vdi nhieu chan giua huong (Phat Hung gay cua tam song c6 cuong Diem) da tung trung Hong, huang dut gay di? M: 3,1 - 3,5 di? Dirt gay Cua Day -Van Ly duoc sli dung viec ly giai x6i li':lbd bi~n Hai Hau 2 D { J n g lu c n g o o i s in h Che di? di?ng luc ngoai sinh la t6 hop nhieu yeu to dong luc, k~ ca tac dong cua nguoi chi phoi qua trinh di chuyen, phan tan b6i tich va l:1ng dong tram tich • Dong chay Son Tay va mang song theo Ninh 2,577 Co la song nho, chi nhan x 10 tan phu 8% lucng sa qua cira Lai Giang Iii song Hong tai Song Day nhan nude song Hong tU khu vue Ha fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA T a y nhung thuc te chu y e u tu Nam Dinh Dao (song Dinh) voi khoang 96 Nam 20 - 27% luong Iii song Hong tai qua song Son Tay va Tuyen mang theo 19,312xl0 G tij,p T a i n g u y e n v a M i tr u a n g tari phu sa [7, 8] Nhu vay, hang b iin nam c6 khoang T i j , p fedcbaZYXWVU X wvutsrqponml 21,889 x l O"tan phu sa qua cua Lai Giang va Cua Day.WVUTSRQPONMLKJIHGFEDCBA • Thuy va m u c n u o c Nam vung anh huang trte u chung cua che' dQ thuy tri~u ven bo Biic bQ noi chung hay ven bo chau th6 song Hong noi rieng vdi tinh thuan nha't cua thuy tri~u tcan nhat va dQ IOn giam dan theo vy dQ, thuy trieu khu v1f.cnghien cuu cling IOn nhat vao cac thang giua mua he (thang va 7) va cac thang giua mua dong (thang 10 - 12) va cuong suat muc nude cling co th~ dat tdi 0,5 m /h , thoi gian trieu rut dai hen thoi gian tri~u len Muc nude trung binh dat 1,85m, nho hon so vdi Hon Dau (1,86m) nhung IOn hon so vdi Lach Truong (1,84m) Mac du ap luc trieu IOn nhung v~ mua mua lu, dong song v~n uu the va khong dong chay nguoc a vung cua song ca tiing mat va tang xuat hien day Tuy nhien, v~ mua kho, luu luong nude song chi bang 1/3 so vdi mua mua lu, nhieu ~ila song vung bd chau th6 song Hcng xuat hien khoang each xarn nhap man dai sau vao d6ng bang c6 th~ dat toi khoang khoang each 30 km a dong chay nguoc va song Ninh Co, dQ man 1%0 each 32 km tinh tU cua Lai Giang, dQ man 4%0 c6 th~ dat tdi a song Day, dQ man 1%0c6 th~ dat khoang each 20 km tU cua Day va dQ man 4%0cimg dat tdi khoang each 17 km [7, 8] Muc nude IOn nhat thuy tr ieu gay ciing chi dat tren 3m, d6 nude dang bao, khong k~ dQ IOn tri~u tuc thi, a cua Day cimg co th~ dat 1,5m (bao Rose, 1968) va tharn chi 1,9m (bao Cecil, 1985) Hien tuong khong nhiing lam thay d6i hinh thai dQng luc cac dang dia hinh moi truong tram tich, ma can anh huang cue doan den phan bo b6i tich va tharn chi la co che liing dong tram tich • Dong chay ven bo va dong b e i t ic h doc bo Theo ket qua khao sat cua Phan vien Hai duong hoc tai Hai Phong khuon kh6 cac nhiern vu cap Nha nude khac thoi gian 1999 - 2003 thay rang dong chay uu the huang nam va tay nam v~ mua dong va nguoc lai, uu the huang dong bac v~ mua he v ~ mua dong (mua gio dong bac), dong chay tiing mat huang nam va tay nam dat toe dQ 19,4 - 39,9 14,1 - 33,3 c m /s c m /s vdi tiin suat 44,1 - 78,6%, huang dong biic dat vdi tiin suat 8,4 - 23,9% Dong chay tang- day huang tay nam dat toc dQ 37 cm/s, V~ mua he (mua gi6 tay nam), toc dQ dong chay tiing mat huang dat tdi 53 c m /s va toc dQ dong chay mat huang tay nam dat 37 tiing day huang dong bac dat toc dQ 27 Tai Hai Thinh c m /s Dong chay c m /s (phia nam Hai Hau), dong bun cat lo lung ca mua gi6 dong biic va tay nam
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