Dl).IHOC Qu6c GIA TP. H6 CHI MINH
TRU<JNGDl).IHOC KHOAHOC TV NmEN
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V() THANH TAN
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'fINI-I TOAN DONG CI-IAY
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VUNG UIEN VEN nO - NUDC NONG
Chuyen nganh : H<liDLtdngHl)c
Mii 86 : 1.07.07
TOM TAT LU~N AN TIEN si V~T LY
TP. H6 Chi Minh -2004
Cong trinh hoan thanh t~i: Bc) m6n V~t Ly MOi Trd<tng, khoa
Vl)t Ly, trdi1ng D~i HQc Khoa HQc TV Nhit}n, D~i HQc Qu6c
Gia TP.HCM.
NgtfC1ihtf(1ng d~n khoa hQc: PGS. TS. IJt}Quang To~i
PMn bit;n 1: PGS. TS. Dinh VAnu'u
PMn bit;n 2: TS. Nguyen HOO NhAn
PMn bit;n 3: TSKH. Phon VAn Hoijc
I
j
Lu~n an dtf<JcbaG vt? tnidc HQi B6ng chii'm lu~n an cii'p
Nha Ntfdc, hQp t~i: tnt<'fngB<;tiHQc Khoa HQc Tt! Nhien TP.HCM
VaG hie: 14 gi<'f30 ngay 24 thang 9 Dam 2004
C6 the am hieu lu~n an ~i thtfvit;n:
~Khoa HQcT5ng H<JpTP.HCM
- Tnt<'fng B<;tiHQc Kltoa HQc Tt! Nltien TP.HCM
1
M(1 DAU
Khu v1!cbie'n yen 1XJDam Vi~t Nam c6 mQt vai tro ra-t
quaD trQng trong nhi~u lanh v1!ckhac nhau. Cae nghi~n cll'u, khllo
sat va do d~c cac d~c tntng hili dudng hQc ngay ding nhi~u hdn
tr~n wng bien yen 1XJ.Tuy nhi~n, cac bai loan mo blah cho vung
bie'nnay van con tltdngd6i it. Cae qua trlnh tltdngtae bie'n-1XJ 1£1
nhfi'ng trd ng~i Idn eho cac bai loan mo blah. Ngoai fa, ding c6
the' ke' th~m blah d~ng du<'1ng1XJva s1!sii'd1}ngcac di~u ki~n bi~n
d6i vdi mi~n tinh c6 bi~n rQng hudng v~ phia bie'n cling 1£1nhfi'ng
kh6 khan kIDthi€t l~p mo blah.
Phudng phap pMn tii'hfi'uh~n vdi tinh ~m deo trong vi~c
thi€t k€ m~ng ludi to ra thich h~p d6i vdi khu v1!cc6 du<'1ng1XJ
bie'n phrtc ~p, c6 nhi~u dao nM. M(ic du v&n tdn ~i nhfi'ngh~n
ch€dang ke ciia n6 d6i vdi cae bai loan mo blah thiiy dQng11!c.
Ngay nay, phudng phap pMn tii' hfi'u h~n dang du~c ap
d1}ngngay cRag nhi~u hdn vao cac bai loan thiiy dQng 11!chQc
bie'n, tU'nhfi'ngmo blah kich thudc nho, yen b<'1(lscandarani, 1993
-Le Provost, 1994 -Kapolnai, 1996) cho d€n cae bai toaD hoao
hm d~i dttdng ba chi~u Dch thudc Idn (Greenberg, 1997).
L~n lu~t cac bai toaD mQt,hai va ba chi~u thllYdQng 11!c
hQc bien sii' d1}ngphudng phap phitn tii' hfi'u h~n du~c trlnh bay
trong nQidung ciia lu~n an.
Cung vdi vi~c ap d1}ngphudng phap so'tri ph~n tii'hfi'uh~n
de' tinh toaDM th6ng hoan lttu gi6 mila ~i dai yen 1XJva th~m 11}c
dia Dam Vi~t Nam, lu4n an nay con sii' d1}ngphudng phap tach
mi~n khong giait cho bai toaDhoRnhm ba ehi~u.
2
A
CHUdNG 1: TONG QUAN
1.1 GiO'ithi~u chung v~ khu vqc ven 1XIDam Vi~t Nam
Vung biin ven 1X7Dam Vi~t Nam du'<;1egidi h~n tit Nha
Trang d6n dao Phd Qu6e du'QechQn lam khu vf{.enghi~n eU'uM
th6ng dong ehiy trong cae thang gi6 mua (tMng 1 va thang 7) va
cae thang gi6 chuyin mUa (thang 4 va thang 10). Khu vf{.enghi~n
eU'uohm trong vUngkinh tuy6n tit 1O3~ d6n 111°E va vi tuy6n tit
7,5~ d6n 13~. Df{.avao cae d~e diim v~ khi tu'Qngva hii van,
ngu'Cfita ehia khu vf{.enay thanh ba vUng. Vung 1 tit Nha Trang
d6n Viing Tau; vung 2 tit Viing Tau d6n Ca Mau va vung 3 lit
vUngyen 1X7biin uty DambQ.
1.2 Cac nghi~n CUDh~ th6ng dong chsy ven I.XI
Mc}t86 dQt khao sat va do d~e dong ehiy yen 1X7tit cae
tr~m do li~n t1;1edii du'Qeti6n hilnh. Trong d6 e6 thi ki d6n cae
dQt "Dilu Ira khao sat tdng hf/p cae dilu ki~n tT!nhien t{li vung
biin Kien Giang -Ca Mau" vitomua kho va mua mu'aDam1998
va ehuy6n khao sat vung biin Phan Thi6t vao thang 10/1999.
1.3 MOt viti m6 hJnh tinh toaD ng~n CUDBi~n D6ng
Cae bili toaD mo hlnh eho vUng biin yen bCfkhong nhi~u.
Do d6, cae k6t qua tinh loan eua roOhlnh Biin Bong va vjnh Thai
Lan eung ea'p nhii'ngthong tin eiin thi6t eho bili loan yen 1X7.
Mc}ts6 k6t qua tu'dng tf{.nhau tit cae lac gia khae nhau.
Ching h~n. mc}th~ th6ng dong eMy ~nh yen 1X7Dam Vi~t Nam
tit Phan Thi6t d6n Ca Mau (vUng 1 va vUng2) hu'dng v~ Damtrong
tru'Cfnggi6 mUa dong -Me va hu'dngl~n bifc trong tntCfnggi6 mua
uty -nam; dong ehiy yen bCfvjnh Thai Lan (vUng3) pMt triin
3
ye'u trong tru'(Jnggi6 mila dong -Me nhu'ngpMt trieD ~nh trong
tru'(Jng gi6 mila tay -Dam; ...
1.4 NQidung lu{in an va phddng phap nghi@ncoo
1.4.1 Cae n6i dung thu'cbien
M11etieu chinh: tlnh toaD h<%th6ng dong chciy gi6 trung
blnh hai chi~u va ba ehi~u khu v1f.eyen b(J Dam Vi<%tNam tll' Nha
Trang de'n vnng bien tay Dam va dao Phti Qu6c trong cae tru'(Jng
gi6 mila d~c tru'ng bhng phu'dng pMp phin tit htru hc,tnvdi mc,tng
lu'di du'~c xay d1f.ngg6m cae pMn to' tam ghic bit ky.
Ngoai fa, phu'dng pMp phin tit htru hc,tncon du'~e ap d11ng
vao bai toaDdong chay troi mQtchi~u vdi roOhlnh Ekman.
Cae ke't qua tlnh toaD tru'£1ngdong chciytu'dng !tng vdi cae
thang gi6 miIa d~c tru'ng va cae thang gi6 ehuyen mila du'~e th~
hi<%ntren cae ban d6.
1.4.2 Phu'dngpMp nghien eltu
Mi~n tlnh yen b(J e6 bien long rit rQng. Phu'dng pMp tinh
hai llin du'~e ap d11ng.LiD diu, vdi mi~n tlnh rQng hdn, khu vJ!.e
nam Bi~n Bong. Ke't qua cua bai toan Dam Bi~n Bong du'~e sit
d11nglam di~u ki<%nbien eho bai toaD yen b(J.
Phu'dng pMp phin tit htru hc,tnd1f~eap d11ngd~ thJ!.Chi<%n
dnh toaD eho cae bai toaD mQt chi~u, hai chi~u va ba chi~u. Cae
mc,tnglu'di hai chi~u du'~exiiy d1f.ngteen cd sd phep dJ!.ngtam giae
Delaunay, vdi thu~t toaD Delaunay Refinement.
Phu'dng phap tach mi~n khong gian va phep bie'n ddi tQa
dQ khong th!t nguyen sigma du'~c ap d11ngde tinh dong ehciy ba
chi~u. Bai toaD ba chi~u du'~e philn ra thanh cae bai toaD mQt
ehi~u theo phu'dng thing d!tng va cae bai toaD hai ehi~u theo
phu'dng ngang.
