Kết quả bước đầu sử dụng tài liệu ảnh vệ tinh nghiên cứu phân bố cỏ biển, rong biển và san hô ở miền trung việt nam tuyển tập tài nguyên và môi trường biển, tập 5

mUNG TAM KHOA Hoe TV NHIEN
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BAN BIEN T~P:fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
T ru o n g b a n :

PGS, PTS. Nguyen Chu IThi

Thu

PTS. Nguyen Huy Yet

ky:

C a c th a n b

u ie n :

PTS. Nguyen Van Tien
PTS. Nguyen Due C1.j
PTS. 'I'ran Due Th~nh
PTS. Luu Van Di~u

PTS. Nguyen Huu ce
PTS.

NHAxu~TBANKHOAHocvAK~THUAT
HA NOl - 1998

Do

C6ng Thung


va

T a i n g u y e n fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
M 6 i tru irn g b ie n . T a p v

Ml)C Ll)CvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHG
Trang
Lei gi<'Jithieu

3

1. Tram tich hat min trong cac cot mau thuoc mat cat ngang vinh Bac Bo
N guyen

2. Dong luc phat trien

C hu

H o i,

N guyen

Q uang

5

T w in

va tuong quan boi tu - x6i ICIbo dao Bach Long Vy

17

H flu c a

N guyen

3. Nguyen nhan boi lap cira Tu Hien CIM
fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
dam pha Tam Giang - Cau Hai
28
na«

T ra n D u e T h Q -n h , T ra n D in h L a n , N g u y e n
N guyen

C hu

u s;

N guyen

Q uang

Than, Pham . V an

nua»,

ca.

P h Q -m V a n V y

4. Hien trang mat dat ngap nuoc trieu CIvinh H~ Long va tac d(ing den moi
truong nuoc
N guyen

co

D ue

5. Su bien d6i dac diem dia h6a tram tich cua vung cua song Bach Dang
duel tac dong' cua can nguoi va de xuat giai phap phuc hoi moi truong
N guyen

T ra n D u e T h Q -n h , N g u y e n
N guyen

C hu

u s;

Van

tu » ;

N h q ,t T h i, L u u

Van

tu e «

T ra n D in h

t.a » ; P h a m .

Van Luong

7. Khai quat ve tai nguyen kh6ang san CIM thong dao ndi cac vung bien
Vi~t Nam
N guyen

87
Le N hu

Lai

9. Ket qua buoc dau su dung tai lieu anh v~ tinh nghien cuu phan b6 co
bien, rang bien va san h6 CImien trung Vi~t Nam
T ra n D u e T h Q -n h , D in h

10. Danh gia tlnh trang

tu « ,

Van

N guyen

N guyen

C hu

H uy

y tt

H oang
H uyen

N guyen

ua. D a m

D u e T ien .

230

110

viei, L u u V a n tn e« , P h Q -m V a n L u o n g ,

T h i M a i A n h , V ii T h t t.u « ,

C hau, N guyen

Xuan

Thyen, C ao Thu

103

tts; t.u « V a n tn e «

Van Luong

11. Ket qua khao sat chat IUQng nuoc vinh H~ Long thang 6 nam 1998
D oan.

94

V an H uy,

nhiem ban vung nuoc yen bo Vi~t Nam nam 1997
Pham .

71

N goc

8. Van dong quay cua 'I'rai dat va su tap trung dau khl

N guyen

65

D o N am ,

c a , N guyen

na«

M ie n , N g u y e n

54

D ue ca

6. Dinh huong quan ly tai nguyen va moi truong M dam pha Tam Giang Cau Hai
N guyen

44

T ra n g ,

D am

D ue

tu «

tru irn g b ie n . T ( ip v
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T riin D l i c T h a n h ,
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D in h

V a n T ien , N g u yln

Van Buy
Buy

Y et

1. MO DAU
Tham co bien va san ho la nhirng M sinh thai quan trong
Chung la nhirng d6i tucng chu yeu phan b6

a

a

yen bO mien Trung.

vung ngap nuoc va mot phan

a

dai trieu

thap nen viec xac dinh dien tich phan b6 cua clnmg rat kh6 khan. Phuong phap xir Iy sO'
anh

v~

tinh dua

vao

khoa giai doan mat dat co the xac dinh duoc dien phan b6

va

d9

phu cua chung. Tai lieu anh v~ tinh con co the cho phep giam sat bien dong theo thoi
gian, tham chi bien d6i mua d6i voi tham co bien. Bao cao nay trlnh bay ket qua nghien
cuu buoc dau sli dung tai lieu anh v~ tinh ADAEOS/AVNIR cua Nhat Ban de xac dinh
dien phan b6 co bien, rong bien va ran san ho

a

mot sO'khu vue thuoc dai yen bien Hue

- H9i An. Day Ia mot phan ket qua cua de tai RA. 96. 001. G z thuoc Chuong trlnh nghien
ciiu ESCAP/NASDA [6].
,

2. TONG

QUAN

VUNG

NGHIEN

CUU

Ba vi tri duoc hra chon de nghien ctiu co bien Ia dam Lang Co (tinh Thira Thien Hue), vinh Da Nang (thanh pho Da Nang) va clia Dai (tlnh Quang Nam) va mot vi trl
duoc chon de nghien cuu rong bien va ran san ho la dao San Cha (tinh Thira Thien Hue). B6n vi trf nay ti~u bieu cho cac thuy vue va cac M tu nhian yen bo mien Trung
Ia dam pha (lagoon); vinh (bay); cira song (estuary)
co mira kho keo dai tit thang
Dao dong tr ieu cue dai 1,1m

va dao (island). Vung nghien cuu

1 den thang 8. Thuy trieu che d9 ban nhat khOng deu.

a

vinh Da Nang. Anh huang cua song den cac dia diem

nghien ciiu khong Ian. Tram tich day gom cac loai cat, bun cat va bun. Trong do, tram
tich bun bot nho thich hop nhat vdi su phat trien cua tham co bien. Bo da g6c 19 vien
lien tuc quanh dao San Cha nuoc trong la dieu kien thuan lei cho phat trien ran san
ho vien bo.

94


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va

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T (ip V vutsrqponm

v A PHUONG PHAp
2. TAl LI~U fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
2.1. Thi Ii~u anh

v~ tinh

Anh v~ tinh A D E O S JA VNIR chup vung nghisn cuu vao hbi 10 h sang ngay 18 thang
4 nam 1997 nhan duoc tU Trung tam Ky'thu~t Vi~n tham Nhat Ban (RESTEC). Tai lieu
anh s6 duoc ghi tren dla CD - ROM thuoc loai da phd co dQ phan dai mat dat cao 16m.
B6n bang phd co dai song nhu sau:
Bang 1: 0,42 -PONMLKJIHGFEDCBA
0 ,5 0 .u m
(blue)
Bang 2: 0,52 - 0,60 ,urn (green)
Bang 3: 0,61 -

0 ,6 9 .u m

(red)

Bang 4: 0,76 -

0 ,8 9 .u m

(infrared)

Anh chup vao thai diem kho kiet nhat trong nam, nuoc bien trong xanh, co chat
luong nit t6t, khong may.
tucng

31,5 x 24,0 km.
dEW

6

anh dam Lang Co duoc chon co kich thuoc 512 lines x 512 pixels,

duong 8,2 x 8,2 km.

6

6

vinh Da Nang co kich thuoc 1792 x 1500, tuong ducng

cua Dai co kich thuoc 1024 x 1024, tuong duong 16,4 x 16,4 km va 0

Son Cha co kich thucc 150 x 150, tuong duong 2,4 x 2,4 km.

2.2. Thi lieu thuc

te

m~t dfit

'I'ai Iieu thuc te tic cac ket qua dieu tra khao sat thuc dia do Phan vien Hai duong
hoc tai Hai Phong chu trl:
- Dieu tra khao sat dia chat moi truong vimg bien yen bo Dai Lanh - Hai Van, nam
1992 [2].
- N ghien ciiu de xuat mot s6 bien phap bao v~ moi truong trong qui hoach xay dung
cang bien Chan May, tinh Thira Thien - Hue [3].
- Dieu tra, nghien ciru M sinh thai co bien nam 1996 va 1997 [7]
- Khao sat ran san ho dao Son Cha thang 8/1996.
- Tai lieu khao sat vinh Da Nang, de tai KHCN 06.07' vao thang 7 nam 1997.
- Tai lieu khao sat thuc te cua nhom thanh vien de tai RA.96.001.G 2 thang 10/1997 [6].
Ngoai ra, cac ban do chuyen men, cac hai do va luc do ty l¢ 1/25 000 va 1/50 000 da

duoc sli dung,
Tai Iieu dieu tra khao sat co bien

(j

khu vue Lang Co va Da Nang duoc tien hanh

gan vao thai gian bay chup cua v~ tinh. Tai lieu khao sat ran. san he dao Son Cha duoc
tien hanh theo phuong phap mat cat - diem va mat cat - khung dinh luong, co sli dung
thiet: bi Ian Scuba, co quay phim chup anh duoi nude.

2.3. Phuong

phap nghien cuu

[1, 4, 5]

Cac thiet bi nghien ciiu co ban bao gom may vi tinh 586, loai co bQ nho Ion, t6c dQ
xli If cao, ban s6 hoa khd A o , cac may in mau khd Ao va A 4. Phan mem xli If anh Iii
95


Tai nguyen va M 6i

tru o n g

b ie n .

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WinASEAN 3.0. Cac phan mem AUTOCAD, ARC/INFO va MAPINFO dung cho cong doan
GIS sau x11If anh.
Cac buoc x11If duoc tien hanh gom: phan tich tai lieu thuc te, giai doan s6, thuc dia
kiern tra, hieu chinh giai doan s6, bien t~p ban do bang ky thuat GIS, tinh toan dien tich.
Ban do phan b6 duoc thanh lap theo ty l~ 1/10 000 cho Son Cha, 1/25 000 cho Lang
Co va 1/50 000 cho vinh Da N ang va cua Dai,
Phuong phap hieu chinh hinh h9C duoc thuc hien het sue can than de co dien phan
b6 dung va dien tich chinh xac cho d6i tuong dieu tra. Ngoai ran san he, tham co bien
va rong bien, da tien hanh phan loai dong thai cac d6i tuong d3':t ngap nude khac nhu
bai cat bien, bai trieu, bo da g6c, bar ngam, day cat, day bun, ... de tranh kha nang may
d9C nham d6i tucng va de hieu them moi truong sinh thai cua d6i tuong. Phuong
dong nhat t6i da (maximum

likelihood classification)

lop mau. Thuat toan "lang gieng gan nhat" (nearest
hieu chinh phan lcai (resampling).

phap

da duoc s11 dung · de phan loai cac

neighbour)

cling duoc s11 dung de

Ca bon bang vdi hai to .hop mau duoc s11 dung la

R, G, B = 4, 3, 2 va R, G, B = 3, 2, 1. To hop mau R, G, B = 3, 2, 1 s11dung co hieu
qua hon d6i vdi tham co bien va san ho ngap chim hoan toano To hop mau R, G, B

=

4, 3, 2

s11dung hieu qua hen d6i vci tham co bien d vung trieu.

3. KET QUA fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
v A THAO LUAN
3.1. Thurn co bien
Dam Lang Co sau 1 - 2m, day phan b6 tram tich bun rong nhat, sau do la bun cat
va cat. D¢ man trong dam cao, 15 -fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
2 3 % 0 ve mua mua, 29 - 3 3 ,5 % 0 ve mua kho. Thanh
phan loai co bien [7] dam Lang Co gom cac loai H o lo d u le u n in e rv is A sc h ., T h a la ssira
h e m p ric h ii (E h r.) A sc h ., H a lo p h ila

o v a lis H o o k e r va Z o ste ra m a rin a L . Vao thang

dQ phu cua co bien 60 - 70%, co noi dat 100%. Vao mua mua thang

4 - 5

10 - 11, co bi chet

hang loat do d¢ due va ngot hoa. Vao thang 4/1997, co bien co dien tich phan b6 108,82 ha,
phan b6 thanh dai gan lien tuc vien bo dam pha, chu yeu d phan ngap nude va rat it d
doi trieu (hlnh 1).
.Ket qua x11 If s6 va nghien ciiu anh v~ tinh MOSS-l

chup VaG thang 7 nam 1992

cho thay dien tich phan b6 co bien trong dam Lang Co la 407,89 ha. Nhu v~y so vci thai
diem thang 7/1992 thl VaG thang 4/1997 dien tich co giam 299,4 ha. Tuy nhien, vi tri va
I

hlnh dang dai ph an b6 co bien tuong tu nam 1997 (hlnh 2). Co hai If do lien quan den
bien dong nay. Thu nhat VaG thang 7 dQ man trong dam pha cao va co bien d thai diem
phat trien nhat trong nam. Thu hai, sau 5 nam co bien bi suy giam dien tich do nen day dam
bi dao boi, khai thac vo so lam vat lieu xay dung vdi khoi luong 5000 - 7000 tan/narn.

o

vinh Da Nang, co bien chu yeu gom cac loai H a lo p h ila b e c c a rri A sc h , H . o v a lis

H o o k e r, Z o ste ra m a rin a

96

L . [7]. Vinh Da Nang co dQ sau dat den 20 m, day phd bien la


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(theo

bun va bun

1. Ban d o phan

tal Ii~u anh

cat. Tuy nhien,

trieu.

Co

ADEOS/AVNIR.

4/1997)

co bien ,chi phan

phd bien d hai hen cira song Ran
co bien

v~ tinh

be} co bien Dam Lang

va

phia

b6 d day bun cat co dQ sau nho hem 6 m,

trong

cira song Cu De. Khac voi dam Lang Co,

d vinh Da Nang kha phd bien d doi trieu

DQ phu co bien

vinh

Da Nang,50

thang

thap va phat trien

- 90%, dien

tich phan

lien tuc xu6ng duoi

b6 260,17

ha vao thang

4/1997,
Khu V1,1ccira Dai sau 2 - 5m, day phd bien bun cat va 'cat, dQ man
d cira

Dai co th a n h ph an loai tuong

khoang

5 - 20% 0

ve mua

kho. Co bien

t1,1nhu d vinh Da Nang;

phan

b6 tren

dien tfch rong 840 ha, gan n h u phu kin vung day cira song, keo dai 6 km nguoc

song Thu Bon va 9 km doc long song De Yang.

7 - TN&M TB

97


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1_ su bien; 2- bAi dl ven dful
pM: 3- ih.im co bitn: 4- d j\y b~n:
5- d:iy dl: 6- l~c dia; 7- bien

H in li

2. Ban dO phan

b6

(tbeo tal lieu anh v~ tinh

B eing 1. Di~n tfch

theo

Khu vue

co

co

bien Dam Lang

MOS

fedcbaZYXWVUTSRQPON

Co

- 1, thang 6/1992)

bi~n 0- m{lt sfi khu virc yen bo- Hue' - H{li An

tal I~u phan tieh anh v~ tinh

Dien tich co bien (ha)

•

ADEOS/AVNIR

Dien tich vung ngap
nJi6c (ha)

T y Ie (%)

Dam Lang C6

108,82

3593,37

3,03

Vinh Da Nli.ng

260,17

43703,22

0,60

Ci'1a D~i

839,94

12466,04

6,74

1 208,93

59762,63

2,02

T6ng cong

98

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3.2. Rong bi€n

o

khu vue ven dao Son Cha, da phat hien duoc 32 loai rong bien thuoc 13 ho,
Trong

3 nganh.

do R h o d o p h y ta

co 15 loai, P h a e o p h y ta

12 loai va C h lo ro p h y ta

5 loai.

Ket qua giai doan anh v~ tinh phu hop voi tai lieu khao sat thuc dia [8], rong bien vang
mat

a

a

phia dong dao, phan tan rai rac

phia hac va my dao va ph an bO kha i4p trung

thanh mot dai hlnh ovan bao quanh ria ran san he

a

phia nam, dQ phu 40%. Di~n tich

nay duoc xac dinh theo tai lieu vien tham la 5,43 ha. Thanh phan loai phd bien thuoc
cac giong S a rg a ssu m ,

D ic ty o ta , v.v.

P a d in a ,

3.3. Ran san h o
San ho dao Son Cha co 123 loai (108 ciing, 7 sting va 3 mem). Cac giong san ho phd
bien la A c ro p o ra ( 1 9 10aO, F a v ia (6 10aO, G o n io p o ra (5 10aO, M o n tip o ra (6 10aO, P o rite s

( 4 loai). Cac 10m phd bien la A . h u m ilis
(D a n a ), A . n o b ilis (D a n a ), A . c y th e re a (D a n a ), M .
tu rg e sc e n s
K lu ttz,

B e r" M . fo lio sa

F. p a llid a

(P a lla s),

P . so lid a

(D a n a ), G. lo b a ta E d w

(F o rsk a l),

a n d H " F. la x a

P . lu te a E d w .

a n d H ., G. te n u id e n s

Vaughan

[8 ].

1 0 8 '1 1 '4 5 .4 0 "

1 0 8 '1 3 '0 5 .4 5 "

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~ :'.\: ";:':f~:

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3. Ban dO phan
(theo

b6 ran

san

tai lieu anh

o

hO va rong
v~ tinh

0 .2

0 .4

bien Wio SOn Cha

ADEOS.'AVNIR
0.8
i

thang

(Thua

Thien

- Hue)

4/1997)
99

T a i n g u yen

va

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Cac mat cat dung lam "khoa" duoi mat day duoc khao sat bang Ian ngam Diving
Scuba va quay video, chup anh duoi nude, Bang 2 trinh bay nhirng tinh chat cua ba mat
cat kho [8].
Bang

2. Di;ie di~m cac mi;it dit ran san hO S a n eba

Tinh chat
Vi tri
Do sau ran
Be rong ran
Do sau phd bien san ho cung

dung lam kb6a gild doan anb v~ tinb

M~t cat I

M~t cat II

M~t cat III

Phia nam dao
0- 12m
120m

Phia tay dao
0- 13m
56m

Phia bac dao
0- 15m
80m

3 - 9m

4 - 8m

3 - 12m

(% )
100,00
100,00
Tong dO phu fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
San ho s6ng
35,0
60,0
San ho chet
2,0
4,0
Rong bien
4,0

44,0

100,00
59,0
3,8
2,6

Day da
Day cat

-

18,0

12,0

6,0

9,0
6,4

Day bun cat

5,0

8,0

-

Loai khac

2,0

6

anh Son

Cha

,

-

19,2

duoc giai doan so co dien tfch 576 ha, trong do, dien tich dao phu

rung cay 126,32 ha, dien tich vung bien 401,24 ha con dien tich ddi bO dao (de) sau den
10 - 15 m) la 48,44 ha (hinh 3).
Bang

3. Di~n tlch ran san h6 va cac d6i tmrDg

khac cY dOi ber dao SaD eha

(tbeo till li~u phan tfch Imh v~ tinh ADEOS/AVNIR)

D6i tuong

Di~n tich (ha)

Ty I~ (%)

Ran san ho co dO phu thap

5,51

11,37

Ran san ho c6 dO phu trung binh
B1iirong bien

17,05
5,43

35,20
11,21

Bai cat bien
Bo da g6c

1,40
19,05

39,33

Cong

48,44

100

2,89

San ho song co d(>phu trung blnh (50 - 60%), dien tich 17,05 ha, phan bo thanh dai
rong 30 - 60 m vien gan lien tuc xung quanh dao. De) sau phan bo san h6 chu yeu tu
1 - 1,5 m den 8 - 12 m, thuoc dClisiren doc .rl;ln. Day chinh la dai phan bo ran san h6
chu yeu san ho ciing doc duoc tren anh v~ tinh. Phia trong dai san h6 nay la bo da goc
bao gom ca phan Ie)tren can va ph an chlm duoi nuoc. Phia ngoai dai san h6 cung la dCli
chan ran co mat san ho sung. 0 phia nam dao, san ho song co de) phu thap (35 - 50%),

100


va

T a i n g u y e n fedcbaZYXWVUTSRQPONMLKJIHGFEDC
M 6 i tru irn g b ie n . T iJ . p V vutsrqponml

phan b6 tren mot bai, ngam co dien tich 5,5 ha. Tai day, tu fedcbaZYXWVUTSRQPONMLKJIHGFE
b e den d(>sau 3 - 5m va each
be 45 - 60m la doi hOn hop san h6 cung va rong bien.

a

la doi san h6 cung va

0

khoang d(>sau 3 - 5m den 12m

d(>sau 12 - 15m la san h6 sung. Co the cho rang, viec tach duoc

ran san ho ra khoi dai be da goc la mot thanh cong doi vdi giai doan so tren may vi tinh,
mac du ket qua phan tich din duoc tiep tuc dieu chinh, kiem nghiem,

4. K E T LU!N
Stt dung anh v~ tinh nghien cuu phan b6 cua co bien, rong bien va ran san h6 la
cong viec con mdi me

a

Vi~t Nam. Nho stt dung anh v~ tinh da phd ADEOS/AVNIR co

d(>phan giai cao, 16m, chat luong tot va bay chup trong dieu kien thoi tiet va thuy van
thuan loi, · kel hop vdi tai lieu mat diU tot, viec xtt ly so phan loai tren may vi tinh da
cho phep nhan biet duoc dien phan b6 cua co bien

a

dam Lang Co, vinh Da Nang, cua

Dai va rong bien, ran san h6 khu vue dao Son Chao Mac du can phai tiep tuc dieu chinh
va nang cao, ket qua dat duoc me ra trien vong kiem ke, nghien cuu dien phan b6 va d(>
phu cua cac doi tucng sinh hoc quan trong nay a nude ta.

TAl LI~U TRAM
1. Barrett

KHAO

E.e and Curtis L.F. 1987.

Introduction

to environmental

Remote sensing.

London: Chapman and, New

York.
2. Nguyen Chu Hoi va nnk, 1992.
Danh gia trang thai dia chat rnoi truong vung bien nong ven bb Dai Lanh - Hai
Van. Luu

a

Phan vien Hai ducng hoc tai Hill Phong.

3. Nguyen Chu Hoi va nnk, 1996.
Nghien cuu de xu at mot so bien phap bao v~ mci truong trong qui hoach xay
dung cang bien Chan May, tinh T'hira Thien - Hue. Luu a Phan vien Hai ducng
hoc tai Hai Phong.
4. Remote sensing for marine study.
Report of the seminar

on Remote sensing Applications for Oceanography

and

fishery environment Analysis. Beijing, China, 7 to 11 May, 1990.
5. Remote sensing note, 1993.
Japan Association on Remote sensing, Tokyo.
6. Tran Due Thanh et all, 1998.
Monitoring of tidal wetlands and its change in the coastal zone of North Vietnam.
A case study in Danang

- Hoian Area. Technical

report

of ESCAP/NASDA

Research Programme, RA. 96.001, ESCAPlBangkok.
7. Nguyen Van Tien va nnk, 1997.
Nghien cuu thanh ph an loai, phan b6 va sinh thai tv nhien co bien cac tinh phia
hac Vi~t Nam. Bao cao luu trti a Phan vien Hai duong hoc tai Hai Phong.
101


T a i n g u y e n v il M 6 i fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
tru irn g b ie n . T i) p v vutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA

8. Nguy~n Huy fedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
Y e t va nnk, 1997.
Khao sat, danh gia da dang sinh hoc va tiem nang bao ton dao Son Cha (Thira
Thien

- Hue). Bao cao luu tru

a

Phan

vien HAi ducng

hoc tai HAi Phong.

SUMMARY
PREMILINARY RESULT IN USING SATELLITE DATA TO INVESTIGATE
THE DISTRIBUTION OF SEAGRASS BED, SEAWEEDS AND CORAL REEF
IN THE COASTAL ZONE OF VIETNAM CENTRE
T ra n D u e T h a, n h , D in h V a n H u y
N g u yen V a n T ien , N g u yen B u y Y et

This report is a result from the theme coded RA. 96.001.G 2 belonging to ESCAP/NASDA
Research Programme. With four bands and high spatial resolution of 16m, the ADEOS/AVNIR
multispectral
seaweeds

image taken in April, 1997 has been used for investigating the seagrass beds,

and coral reef in the coastal area of Hue - Hoian, Vietnam Centre.

The sites of

Langco Lagoon, Danang Bay and Dai Estuary have been chosen for studying seagrass beds.
The Soncha

Island has been investigated

quality of satellite

and truth ground

diving, the distribution
identified

by digital

and coverage
processing.

in seaweeds and coral reef. Thanks to the good

data including
of seagrass

From the studied

underwater

bed, seaweeds
result,

inventoring and monitoring them in the Vietnam coastal zone.

102

ones surveyed

by SCUBA

and coral reef have been

it is expected

to possibility

of