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- BO GIAO D{)C vA BAo T~o
TRUC1NG B~ HQC T6NG HQP THANH PH6 HO CHf MINH
NGUYfNTHfNGQCLAN
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THANH PHO HO CHi MINH - 1994
- LU~N AN DU
- ,.H04" NGU'(ANB VI$'r) DONG ,.BONG L04N AN
=Sand = Clayey
B1iicat bien beach BUn set silt
= Tidal Cat-tho
mud flat - Sand - coarse
B1iithllYtri€u bUn
=Tidal - medium
sand flat
B1iithllYtri€u cat - trung billh=
- fine
B1iitri€u cat cii'asong= Distributary mud sand flat -1$
= Backswamp
Bu'ng sail de - rilt m~n - very fine
= Climbing-ripple
Ne'p nhan leo
CU lao song, c6n song: River island
= Point bar lamination
Doi song
mangrove swamp IS~p la d
- D~C DIEM CHUNGCUA Lu4N AN
I. MVC 8!CH NGHIEN CUU :
D~ tai "Dia mqo trilm tieTzl[ng d{Lng Rllllg Sac Gia Dilllz" uu\.Ie
thlfChiQn nhilll :
. Yf. rri~t hQc thu~t, nghien ct1u cac d~ng dia m,!-ou
- thay d6i trong qua trlnh tnfang thanh cua chung, tu do, d6 nghi huang sU'
d~ng ho~c khai thac h
- 5. CAD TRUC CUA LUAN AN :
Lu~n an g6m 130 lrang khCmgkE hinh anh va phu lue vOi 55 lai
li~u tham khao trong va ngoai nude,t6ng cQng khoang h()n 160 lrang .
NQi dung g6m ba ph§n, 8 chuang, kh6ng k6 ph§n mC5
a~u.
Ph§n mC5
d§u : ml}c aich yell du va phuong phap nghien C\lu.
Ph§n I : B~c ai6m aia ly tlf nhien, kinh te nhan van va aia
eh1t.
Ph§n II : Ket qua nghien e1h1va thao lu~n.
Ph§n III : Ket lu~n va kien nghi.
6. T AI LI~U THAM KHAO
Tae gia dii tham khao cac tai Mu v~ di~u tra co ban tren aia ban
huy~n Duyen Hai cua : Ban Phan Vung Kinh Te Tp.H6 Chi Minh
(1988), H6 Chin (1983), B~ng HI1uDi~p (1983), Bo~mBia ch1t Tp.H6
Chi Minh (1989), B~ng C6ng Minh va Nguy~n HI1u Nhan (1993 va
1994), Bili PM My va D~ng HI1uNgQc (1983), Nguy~n Hau Phudc
(1989), Trh Kim Thgeh va nnc (1978 va 1983), Huynh Trung va nec
(1983), (Xem thuml}e tham khao trang quy€n lu~n an).
v~ s6li~u 15 khoan, lac gia chI tham khao 3 16 khoan eua Boan
dia eh1t Tp. H6 Chi Minh (LK821, LK822, LK827).
- M(j DAU
Ja d0ng
Rang Sac Gia 8inh b0i phu sa cua slmg 80ng Nai
giap ranh vdi bi6n Dong, c6 di(:n rich Ii! I IOOOOha,bao g6m chu yell Ii!
huy~n Duyen Hili TP H6 chi Minh mOLben, va mOLph:in cua huyt;;n Long
Thanh (tlnh 86ng Nai)va huy(;n Long Phil (tinh Ba Rja- Vang Tau) mOt
bell.
lrqng tam la huy~n Duyen Hili.
Nghien CUll nay c6
HuYQn Duyen Hili TP H5 chi Minh, nay Iii huy~n 01n Gia,
ou
- 3.- (fng dl;lng VaGqui ho'.lch va phCtllriGn huyi;n Can GiG.
11.- PHUONG PHAP NGHIEN CUU :
- Gdi doan pictol11ap 1/25.000.
- Giai doan anh vf; [inh va
- sa 80 cAc Budc TIENHANHDE TAl NGHIENCUU
THAO LuAN BAN DAu
a.- Xac djnh ml,lclieu
b.- Thu thij.pcac thong tin
C.- Lij.pke ho~ch nghien cU'u
Tu Ii~u tham khan v~ +- Kh6a anh may hay II
dja chat, cau truc vung ANH VB TINH l~ 1/50.000 cua nh6m
NC. cd ban ve trilm rich ANH MAy BAY Dornbusch ve diLl nwo
cua cae TGC tn~n the trilm rich CULt
TGc.
giai. -+
~
~
La khoan ki
- PHAN I :
CHVdNG 1.- DAc DIEM D!A LY TV NHIEN - KINH TE -
NHAN VAN:
Huyt;n C~n Gia vdi dit;n rich bon 600 km2, chiem lrl)n phan
phia Nam cua tam giac cMu song 8iSng Nai (Nha Be-Can Gid), vdi
m
- t~p trung nghicn cuu, tuy nhicn, tat d CC) e roi r~c Ie te
v Cil I1hl11 1\.;II~
.
hup ve ulc khia canh nay can du'
- PHAN II :
CHV0NG III.- £>~A
HINH £>~AMAO RUNG SAC GIA DINH :
Cling nhu d6ng bang phu sa cua nhi€u tam giac chao tren
the gidi, d6ng bang song D6ng Nai g6m toiin Iii v~tli~u phu sa, co hlnh
3 goc rfit 1'6net: do Iii mQt tam giac chao dung nghia cua tu DELTA. Ba
goc nfiy Iii Nhii Be, vang Tau, Cfin GiuQc. Phia dong giap vdi D6ng
Nai, phia tay giap vdi Long An, phia Dam vdi Bi~n Dong. Philo Idn cua
d6ng bang n~y la huy~n Duyen Hcli TP H6 chi Minh (nay Iii huy~n Ciln
Gio).
.:. Dia hlnh co 3 d~c di~m chinh Ii:!:
- Day Iii khu We chang chit song nhanh toa tu song
D6ng Nai, song Thi Vcli,vii song Viim Co.
- Ph§n ngoiii bi~n co dia hlnh cao hdn bell trang dfit
hi~n di~n cua nhung IU
- Noi bG bi6n, thuang c() nhung thay d6i dOt ngOL Day ]a
noi ma ho
- giac chau, m
- mjn to' hai dlnh gi0ng loOt xu6ng sail moi cejn mua hay khi c() hCio. NhC!
co nudc to'trong gi0ng rl fa, thtfc v~t () day kha phung phu, L1(JI1g()P
g
mOt lu0ng mun can trong don vj niiy. (5 day co nhling lach I1Lr(ic
nIle')
giup thong thl.Wng vdi nudc 0 song nhanh cua cac song IOn, t~IOncn mOt
m6i truong nudc 10 - vdi thtfc vc;itchinh la duoc - va trung, thuC!ng
xuyen ling nudc. V~t li~u tr~m tich chu yell la bun va set, vdi nhi6u xae
bil thtfc vc;it, Iii di~u ki~n t6t cho vi~e pIlat sinh ra mOl!uL}ng phen ticm
tang, du khong dang kf Him.
Neu khoang cach gilia cac gi0ng dO vai cay sC), sail giong
thuong xua't hi~n cac ao , yang hay Ii;lChnude man trung dL)thuC!ng c1Lruc
tich tl.}nhling vc;i Ii~u min nhu bUn set vii nhieu chill hl1u CLio la o(in
t Do
vi bung sail gi6ng. Trong giai doi;lnd§u, bung co khii Dang giao Iuu vdi
hen ngoiii, qua nhling trung nhe) gQi Iii "pha". V6 saD, stf giao IUDcham
dU't,bung bi co Ic;ipd§n vii chet . Xac bil thtfc v~t t':lOngu6n sulphur cho
stf t6ng h
- IV.2.2.- Nhom c1amman:
Drjn vi tra m rich na m hoc theo chan cac gi{mg ca l nl1L('j
i
phia biic can Th';lnh, Ly Nhcin, Gi6ng Chua; g6m chu ye'u Ia bun rha set
ho~c it cat min va mull xam xanh, hoan loan m~n du'
- moi truang do slf boa tan khOling v~t set va slf ngheo nan cua baz lrao
d6i. KGI qua cuoi clIng la dill co pH thap - lhuang la giITa3 va 4 - nghco
baz IraQ d6i, giau AP+ tlf do d~ trao d6i. Cac IOC;li suI fat chou phcn
oat
do dU
- Cac long song d~u bj anh huang loan 00 eua han nh~l
a long
lricu, do v~y tr~m lich mang va hai hen hd xay ra ILCngch~fJ
lrong ngay. Khi trifu xu6ng, phu ,sa ra bi~n g6m co hal fJhein .
- Ph~n Id hlng duQc lai lrang nude,
- Ph~n day trUQldai hen dudi.
Kjp 'khi tri~u len, v~n t6c ra bj tri~l lieu, loa n bt) v~l Ii~u
Id Ittng rdi t~i ch6, con v~lli~u day ogling di chuy~n xuoi dong. Sau d6
trifu xu6ng va qua trlnh tha nha't l~i tie'p dien. Cho nen lram lich va x6i
moo xen ke nhau, lam n6i b~llen mau thuan C
- lay Ly Nhon; trong khi vung Long Tau-ThiVai g6m loan v~t li~LItram
tich bun set cua dam m~n.
Nha stf phan bO'trung thtfc theo anh huang kep cua dong
nudc song va trifLl, don vi b6i tich long song tra Den d~ phan bi~t. D6 la
cae de ttf nhien, de thUy trifu, bili b6i, doi song, c6n song , do~n song b6
vdi nhung lo~t tr~m tich mdi va cu. Tuy don vi tr§m tich, chat tram tfch
a day c6 th€ la cat, bun, hay bun set vdi thanh ph§n v~t chat huLl co
khOng cao (#3%). Day khong phai la don vi phen quail trQng.
CHUaNG V.- QUI LuA T HINH THANH.-
Stf phan bO', dinh hudng va dia hinh cua mQt tam giac chaLl
thuang duc;fcki€m soat boi nhifu ye'u to' nhu : khf Mu, lu'U luc;fngdong
chay, suc n?ng tdm tich, qua trinh tr~m tich cii'a song, s6ng, tri~u, gi6,
dong nudc, tri~n dO'c,kie'n tgO va dia hinh cua b6n tho nudc (Hlnh V.l).
Chung qui c6 th€ phan ra 3 nh6m :
- Qui lu~t kie'n t~o,
- Qui lu~t thUy dQng,
- Qui lu~t cLIngung cha't tr§m tich.
V.I.- Anh huang cua kie'n tao :
Lich sii' dia cha't cua tam giac chao Cii'u Long va D6ng Nai
dil c6 3 thai ky lieu bi€u nhu sail (t6ng hc;fpsO' li~u cua Biwas 1973,
Fontaine, Delibrias 1974, Kawamura, Laming 1974):
- Tli 2000 Dam tra l~i day: bi€n khOng lui ra dang kE.
- Tli 5000 Dam de'n 2000 Dam : bi€n lui ra kha nhanh.
- Tli 11000 nam de'n 5000 Dam : bi€n trail vao kha
nhanh.
16
- - Tv I WOO n:1111 VC lrude : mue hien i'j mLre - 70mel
ln'j
doi vdi mLje bicn hi0nlal do hlen rll11'a khLji.
Theo quan niell1 linh. hien tien va lui nhu v~y la do I11Lje
bi~n Dang hay hq tren hlnh dien loClncau. Theo quan ni~m d(mg, hi0n
tu(jng nay do n~n dJ SlJp xu()ng VCI Jng len theo nhip. D6 la hm.lt (10ng
n
kien tqo.
ThLje v~y, boat e1()Jlgklen Lao da t?O ra cae ]oal dJt gay
then nhung phuong khae nhau.Tl'uoe hella 10?l dut gay Thea huong lay
b~e- dong nam, trong d6 (1l([g,ly doc lheo hudng Bien Hoa - Vilng Tau
la khong ehe. Gan nhu thiing g6e voi loat nay e6 lo(lt dut gay lay Ham -
dong b~c, ch(lY tv Phil Lam den Thu Due. Cii hai nh6m nay t,.to ra khoi
WP nam Trangkhu vLjeNha Be NhOnTrqeh - Vilng Tau - Go Congo
-
Chinh ehuy6n d
nguon tai.lieu . vn
