Sông thái bình trong quá trình phát triển khu vực tiên lãng thông tin khoa học xã hội và nhân văn hải phòng

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T h o n g tin

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ZYXWVUTSRQPONMLKJIHGFEDCBAA
1 1 I1 I

KHOA HOC XA HOI &
NHAN VAN HAl PHONG

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Nghj
Thanh
quoe

09

quyet
uy

v e ' th f!C

t e 't " i

cua

h i~ n

Ban

H9i

U

T h U 'O 'n g v L J

n h ijp

k in h

te '

Hai Phong.

* M 9 t s o 's u y
n ie m

N Q IT U

I

Phat

nghi

b U c 1 Cd a 'u v e ' v ijn

t r ie n

ben

v iit lg

dLJng khai

tro n g

d ie u

huy

nguon

k i~ n

V i~ t N a m

*

*

T im

h ie u

it

nhan

ta i

Q uy

d jn h

v L J n g h ie n
ngh~

TRUNG TAM

KHOA
....

cap

cech
cec

te m

th tJ e

nuo»

tn e n n

J"

f)o n g

at

XA

xec

h9C va ph

d jn h

at

t r ie n

pho:

HOI & NHAN
....

THANH PHO HAl PHONG

1 f!C

A.

t h 0 1 v e ' v ie c

c t i'u K h o a

HQC

ph

VAN

n h i~ m
cong

'H

1 f7 J a @ T J a ~ tJ a T J a

KHOA HOC Xl HOI &
NHAN VAN HAl PHONG
oft

'"

'}

TRONG

"

s6 NAy:

LUQC THUAT ZYXWVUTSRQPONMLKJIHGFEDCBA
& GIGI THI$U :
• Nghi quyet 09 NQrru cua Ban thuong vu Thanh uy v~ thuc hien Hoi
nhap kinh te qu6c te tai Hai Phong
ITKHXH

NGHIENCOU

&

NVHP

:

• Mot s6 suy nghi buoc dau v~ van dung khai niern Phat trien ben virng
trong dieu kien Viet Nam
.
GS. LE QUY AN
• V~ kha nang hinh thanh mot khoa hoc moi v~ con ngiroi

TS. HO SIQUY
Ph6

v ie n tr u d n g

V i n n g h ie n

cuu con nguai

ã Tim hieu each thirc phat huy nguon lire nhan tai b cac mroc Dong A .
PGS. NGUYEN HUY QUY
T a p c h i n g h ie n

c u u T ru n g Q u o ('

• Tong quan nong nghiep, nong thon mroc ta dau the ky XXI.
MINH HoAI -

P G S -T S k in h

te

• SOng Thai Binh trong qua trinh phat trien khu vue Tien Lang.

15 TItAN DOC THANH & DINH VAN HUY
Phdn

HOI THAo KHOA HOC qCH

v ie n H d i d u a n g

h o c ta i H d i P h o n g

Sa:

• H<.>NXWVUTSRQPONMLKJIHGFEDCBA
h ii b Ho~ch Tr~ch
TANG
N guyen

G ia m

BA

HOANH

d o c : B d o ta n g tln h H d i H u n g c ii

• Vai tro ngtroi my va ho ngoai voi danh nhan van h6a Nguyen Binh
Khiem.
NHUvANNHA
T r u o n g h o N h ii t h a n A n T u , T i e n L d n g

THONG TIN - KHXH
•

&

NV :

Q u y e t dinh v/v ban hanh "Quy dinh tarn thai v/v xac dinh nhiem
nghief ciru khoa hoc va phat trien cong nghe cap thanh ph6.

• Mai nha chung cua doanh nghiep mien Duyen Hai Bac

VI,l

&?

HWDlNH TSRQPONML

TIN HOAT DONG - KHXH

&

NV-HP :

• Hoi nghi trao d6i y k ie n v~ thong tin KHXH

& NY - Hai Phong


32

THONG

T IN

KHXH

& NHAN

VAN

HAl

P H O N G onmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA

SONG THAI BINH TRONG QuA TRINH
~

/

~-

vue

PHA T TRIEN KHU

TRAN

TIEN LANG

BUG

THANH

v a B IN H

vA N

HUY·

M& dau
Thai

Binh

da tung

la con song

Ian thir hai & Dong

Bang

Bac BO, chac

chan

co vai

lich Slr phat

trien tLJ nhien va kinh te xa hoi mot khu VLJCquan trong
cua dong bang chau th6 song Hong. Hien nay, song bi suy tan kha nhanh va lam thay
tro to Ian trong

d6i dang

ke moi

trong

qua khrr co

trang

tu o n g

truorig

y

tLJ nhien

nghia

lai. Mac

tren

ca ve khoa

du chua

c6 dieu

dien

rong.

hoc,

thuc

kien

khao

Tim

tuong

goi y can thiet cho nhung

nhirng
ong

y

bai viet chl la

Nguyen

Phong

Ngoc

da khuyen

Thao,
khich

hcac

nghien

Giarn

doc

d6i

dong

song

diroc nhung

bien

sat k y , bai vier nay duoc

nay
dong

hoan

thanh

tai lieu han che, nhung

van de

suy nghi biroc dau, Du sao thi day cung

ciru ky hrong

trung

cac tac giil hoan

thay

tien va dLJ bao

nho tap hop mot so tai lieu roi rac da c6. Do dieu kien
trinh bay trang

hieu

tam

thanh

sau nay. Xin chan

Khoa

hoc

Xa

hoi

thanh

la

earn an

va Nhan

van

Hili

bai vier nay.

1. Khai quat dac diem dia chat va dia hinh
Khu VLJCTien

Lang

tao to i mot vai nghin

narn & doi sut ha tay nam
met

va khong

trung

true

Tay B~c - Dong

huang
Luoc

La gan

va dirt gay Diem

Tram

long

Nam.
Dien

song

be mat dong

De tu dat den be day tren tram

phu

boi

Nghia

tram

tic h

Thai

Binh

blnh

do tan kien

va dut gay

tu6i

- Ninh

trong.

song

Giang

Van

tao va

Cac dut gay
Dc co huang

gan trung

true song

dong bac - tay nam.

bang

met. Phan

Binh,

va cac xa phi a tay bac song

tu6i Tcan

co be day khoang

Ian be mat dong

Toan

tan muon.

Moi diroc phu boi tram

lS00-2000m.

bang

trang

ChI co khu

huyen

Tram TSRQPONM
duoc

VLJCxa Khoi

tich cua he tang Hili Hung,

tan sorn - giua.

Dia hinh

be mat

dam lay - bien

*

he tang

Thai

Do San co huang

tic h

do sut ha tan kien

che boi hai he diit gay quan

Cac dirt gay Ha Nam

tich De tam narn duoi

co bien

10 da goc tren mat. Tren

kien tao hien dai, khu VLJCdtroc khong
sau Song

Do San,

dong

tu6i Toan

bang

Tien

Lang

tan trai kha rong

T S . P h a n v ie n H a i D u o n g h o c ta i H fli P h o n g

chu

yeu

va thoai,

la dong

bang

do cao trung

tich
binh

tu song

O ,S

- 1 ,S

- bien,
m, co


- .---~.--------------------------------------------------------------~==--~ZYXWV

T IN K H X H onmlkjihgfedcbaZYXWVUTSRQPONMLKJIHG
& NHAN VAN HAl PHONG
33

THONG

th~ bi ngap

nurrc khi thuy

mat dong

bang

den 4-4,5

m. Cung

trieu len cao, nhung

co mat cac de cat bi~n c6 va hien

2. Qua trinh boi tu va

bang

dong

Tien Lang,

bien

2-3 m, it khi

xung

durmg ra phia bien.TSRQPONMLKJIHGFEDCBA

co th~ phan

=

1,3 - 1,7), mau

nhau

ve thanh

dai va dQ cao. Cac de cat bien

nen it ngap lut va la nhung

quanh

dQ cao dat 4,5 m, dinh
(Md

5 he boi su khac

tich tu cat chira mroc

tap trung dan ctr song.
bac va ta y bac

huyen

Tien

keo dai 3 km dQC quoc IQ 10 va 500 m den

Chung

I la cat hat trung

thanh

keo dai, chieu

de cat ph an bo' & phia

cac

ghla, Tan Tien).

=

Lang

vi tri ph an bo' va huang

H~ I: Gorn

dQ cao pho

t h a i v t l t h a n n XWVUTSRQPONMLKJIHGFEDCBA
p h d n V {U c h a t d e c a t c o :

nong. VI the tai day thuong

ngdrn tang

(So

dich chuyen

h in h

De cat c6 & khu Vl!C Tien
n6i cao hen

dai,

tan nam sau cac de cat c6.
SI!

b o : d a c d ie m

phan vat chat,

de bao bao ve. N6i tren

h~ thong

kha ph6 bien cac ho dam, la di tich con sot lai cua cac khiic uon

song c6, hoac cac lach trieu

2 .1 . P h a n

duoc

huang

dong

0,5 - 0,2 mm),

(xa Khoi

1000m

tay bac

&

tay nam. Vat chat cau tao nen he

bac -

hat nho

Lang

(Md

=

0,1 - 0,25

nau do, vang den xarn sang. Thanh

mm),

chon

bot set chiern

phan

IQc tot

ty I~ rat

10%) va i t gap va so, S c .

it «

H~ 2 : Gorn cac de cat xung
500m

den 2km,

thi tran Tien

quanh

lang, co chieu

dQ cao 3 - 3,5 m, th a p h e n H~ 1 , d in h huang

kha

dai kha dong deu nr
IQn x o n , k h o n g dong

nhat theo mot huang nhat dinh. Vat chat cau tao nen M 1 chil yeu la cat nho, mau
xarn vang, xarn nhat va co Ian nhieu vo voi sinh vat dang so S c ,
H~ 3 : Gorn
xa Tcan
xarn vang
chiern

nhieu

ThAng,

den xarn nhat

10 - 20%,

phan

den 2,3 km, chieu

cua
Van

60 - 70%

chira nhieu

duoi

met

xa Hung

den

2 km,

cac de cat la dong
lIc.

Vat chat

chon

nam

dQ cao

Tien

=

IQc tot, va bQ (Md

dong

Chieu

Lang,

tai cac

cua chung
va gan

va Nam
2,5

vuong

cao

goc

Chieu

hen

500 m

vang,

dai cua

he 3 chut it.

voi huang

xam

nr

mm )

nhat dinh.

Hung.

-3m,

cau tao chu yeu la cat n h o , rnau xarn,

0,1 - 0,05

dai cua chung

nhat theo phuong

BAc Hung

- tay nam

thi tran

cau tao nen H~ 3 la cat nho, rnau

vo so, oc bien.

ThAng,

bac

dong

Vat chat

cao 2 - 2,5 m), xep khong

nr vai tram

Huang
song

va Tien Minh.

chiern

H~ 4 : Ph an bo' & cac

chung

bo' & phia

cac de cat phan

Tien ThAng

true

chon

long

IQc tot

va chira it va so, oc bien.
H~ 5 : Phan

bo & xa Vinh

3 den 4m. Phuong
chat cau tao nen
Ian kha nhieu
2 .2 .

Tudi

Cac
nang

dong

M

v a tie n

tr in b

Cac

tao,

500 m den 3 km, dQ cao tir

vci true long song Van lIc. Vat
xarn vang,

chon

IQc tot va

•

h in h . th a n b

c a c d e c a t.

cac de cat co tudi tre dan nhung

M 1, 2, 3 de cat co dQ cao giarn

H~ 3, 4, 5 de cat co dQ cao tang
ha kien

gee

nr

nay chu yeu la cat nho, mau xarn nhat,

va so oc bien.

nhat,

DQ dai cua chung

cua cac de cat nay gan vuong

Tu luc dia ra bien
khong

Quang.

co th~ do dao dong

dQ cao cua
dan theo

chung
huang

lai bien

doi

tu6i tre dan.

tudi tre dan. Nguyen nhan co th~ do
chan tInh cua rmrc nurrc bien hoac ket hop ca
dan theo


34

THONG

T IN

K H X H onmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA
& NHAN VAN HAl PHONG

hai. Tuy nhien sir thay d6i dO cao de cat phan anh su thay d6i nrong doi rmrc mroc
bien trong qua khir. Khi moi thanh tao, da phan cac de cat nam sat hai phi a cira song
va tao ra mot dai trung narn song song v c i dirong bo.
H~ 1 duoc hinh thanh vao cuoi Toan tan giua. khoarig giai dean dau cua bien rut,
sau rno rong

Cl!C

dai cua bien tien Flandrian.

DQ't bien lui the hien ro vao khoang 4 - 3

nghin narn truce. Sau do mire ruroc bien lai dang dan tao dieu kien de s6ng pha huy
mot phan de cat H¢ 1. Sau d6 rmrc mroc bien lai ha thap dan, s6ng vun tao nen cac de
cat cua he 2, phan bo' kha sat voi H¢ 1.
H¢ 2 va 3 duoc thanh tao trong co che bien rut va ha thap nrong doi rmrc bien sau
ky bien Ian vao dau Tcan tan:

m uon,

H¢ 2 duoc thanh tao vao dau Tcan tan muon (den

2000 narn truce). H¢ 3 duoc thanh tao vao gitra Toan tan muon (du dean khoang 2000
- 1000 narn truce).

Sau khi hinh thanh H¢ 3, mire nuoc bien c6 xu the dang cao dan.

H¢ 3, 4, 5 duoc hinh thanh trong khi mire rnroc bien dang cao dan, nhimg bien van lui
do toe dO lang dong tram tich 16n hon tee dO dang cao mire mroc. H¢ 4 duoc hinh
thanh vao cuoi Tcan tan muon (dir dean khoang 700-500

nam truce).

H¢ 5 moi hinh

thanh each ngay nay mot vai tram nam.
Tren TSRQPONMLKJIHGFEDCBA
c o s a xac dinh cac he thong de cat c6

a tren c6 the dua ra 5 dirong bo c6 irng

voi tu6i khac nhau.
Bang

Bang

1 : T u tii v a c h ie u

d a i c a c XWVUTSRQPONMLKJIHGFEDCBA
d u o n g b o c o ' k h u V I!C T i e n L a n g .

H~ duong bCY ciS

TuiSi uoc doan (narn)

Chieu dai (km)

I

4000

8

II

2000

12,3

III

1000

7,4

IV

500

11,2

V

100

8,2

2 :

T o e d 9 tie n r a b ie n

c tla d u im g

bo co:

Giai doan

Bien dO tien (m)

TOe dO tien (rn/narn)

2000 - 1000

4500

4.5

1000 - 500

3000

6.0

500-

2500

6.2

10.000

5.0

100

2000 narn qua


T H O N G T IN K H X H onmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGF
& NHAN VAN HAl PHONG
35

Khcang

2000 narn tro lai day, toe dQ tien ra bien cua dirong b e TSRQPONMLKJIHGFEDCBA
a khu VIlC Tien

Lang trung binh khoang 5.0 m/ narn. Hien nay a khu VIlC xa Vinh Quang dang dien ra
qua trinh boi tu rnanh voi to e dQ boi tu kha Ian (14,2m/nam).
3. Bien dQng long dan cua song Thai Binh.
3 . 1 S o n g XWVUTSRQPONMLKJIHGFEDCBA
T h a i B in b h ie n n a y .

H~ thong song Thai Binh bilt nguon tir vung nui dong bac. Cac song Luc Nam,
Thuorig,

Cau va Duong

sau khi hop hru a gan Phil Lai, each Bien 90 km

thanh hai nhanh chinh la song Kinh

Thay

ca

phan

va song Thai Binh. Song tiep tuc phan thanh

2 nhanh la Thai Binh va Van Dc a phia ta y nam Do San. Den khoang Ben Trieu, each
bien chirng 48 km, song Kinh Thay phan thanh hai nhanh chinh la song Da Bach va
song Kinh T h a y . Gan den sat bien, hai nhanh nay hop hru va roi lai phan luu thanh
song Chanh d6 ra cira Lach Huyen, song Bach D~ng d6 ra cira Nam trieu, song Carn
va song Lach Tray d6 ra cira Ba Lach. Tir narn 1981, do dilp dap Dinh Vu, song Carn
qua kenh Dinh Vu d6 ra cua Nam Trieu. Ngoai ra, trongIie

thong song Bach Dang,

can co mot so nhanh nci ngang nhtr Tam Bac (noi Cam va Lach Tray) va mot so
nhanh phu khac. Truce day," song LUQc noi song Thai Binh voi song Hong gan Hung
Yen. Narn 1936, song Moi duoc dao (co Ie tren mot nhanh song tll nhien tan) de noi
song LUQc voi song Van

ue.

Tir do, song Van

Dc tiep tuc phat trien m e rong cira dao

sau va mo rong long song, can song Thai Binh tan di rat nhanh. Huyen Tien Lang
narn gitra hai song chinh la Van Dc va Thai Blnh.
Dean tir song Mia toi Quy Cao dai 5km da bi boi lap han thanh bai boi. LUQ'ng
nuoc thuong nguon song Thai Blnh chay ve khong true tiep d6 ra ducc cira Thai Binh
ma phai chay qua song Gua va song Mia VaG song Van

Dc roi d6 ra cua Van

Dc.

Phan I a n mroc song LUQc qua song Moi sang song Van Dc, mot phan nho nuoc song
LUQc chay VaG song Thai Binh va thoat ra bien qua cira Thai Binh. Do vay long song
Thai Binh cang tra nen hep hon va toe dQ dong chay ngay cang nho, sir bci lang cung
ngay cang tang len.
Song Van

Dc co dQ doc nho, uon khuc nhieu, dean nr xa Minh Dtrc den cua Van

Dc long song duoc mo rong hon. Khu VIlCben Khue,
ngarn,

te e

long song co nhieu go va bai

dQ dong chay trung binh 1,2m/s, dQ rong long trung binh 400m , dQ sau

trung binh 8m.

6

sat cira song, toe dQ dong chay nho hon, long song rong hon. Liru

IUQ'ngtrung binh nam 506 m 3/s (khoang

16 trieu m 3/nam), chiern 60% t6ng hrong mroc

song Thai Binh. T6ng IUQ'ng 10 mot ngay mua lu dat cao nhat 294 x 106 m 3, toe dQ
dong chay nho VaG thang I I va I I I .
Song Thai Binh co toe dQ dong chay trung binh 0,6m/s, rong trung binh 150m, sau
trung binh 3m,

a vung cira song dong chay yeu hon va nong hon. LUQ'ng dong chay

song Thai Binh chi dat binh quan 73m 3/s (khoang 2,3 trieu m 3/nam).
3

Ve mua In, t6ng

IUQ'nglu mot ngay co the len 74xlO m . Dong chay nho nhat xuat hien VaG thang I I va
III.


THONG TIN KHXH & NHAN VAN HAl PHONG

36

Hang

khoang

narn song
13 trieu

10 Ion, thang

Van

Thai Binh

Oc va song

d6 ra bien

va

VII

VIII

co d¢ due

trung

song,

bai ngarn va bai boi ngap trieu. Trang

chiern

75 - 85% va tai hrong bun cat chiern

mua

cua

dong,

Van

mroc

song

mot ngay,

man Ian nhat,
hien

thay

d6i theo

co do man cao.

Tren

bien

binh

3

nuoc va

song

trinh

Thai

hinh

trinh

xuong

trieu

day song

nen cac dao chan

mua mira 10 (Thang

Mua

Vao thang

6 - 10) tai luong

he, n u o c song

gieng,

cua
nuoc

tu bien trinh trieu,

va chan

cao nhat

mdi ngay

man (dlnh

nuoc

song

vao thang

5.

co mot Ian d¢

va chan

man)

xuat

1-2 gio. Tai mot vi tri, d¢ man tang

trieu)

do su xarn nhap

co d¢ m a n nho va

hai va ba, d¢ man

d¢ man cua n u o c song

tuong

(dinh

thanh

90 - 95% t6ng luong ca narn.

mua.

Binh

d¢ man

3

narn XWVUTSRQPONMLKJIHGFEDCBA
1 0 0 0 g / m TSRQPONMLKJIHGFEDCBA
.
LUQ'ng bun cat

nhieu

mot Ian d¢ man nho nhat va cac bien trinh

sau cac bien

ur mat nuoc

song

nuoc

Oc cao nhat.

Trong

18 ty m

Ufn bun cat. D¢ due Ian nhat xuat hien vao cac con 10 dau rnua va con

y e u gay bdi lang vung cira song
cua song dua ra chu ZYXWVUTSRQPONMLKJIHGFEDCBA

D¢ man

khoang

man

vao sau trong

song

theo

dang

hinh

nern.
Lien quan

den dia phan

Tien

Moi dai 3 km, trung

binh

km, trung

binh

100m,

binh

120m,

rong

rong

Vung
Trong

mot Ian nuoc

va dong

Binh

co toi

Lich

trien

gan lien

nhir luan d6i nhau
long

bo c6

cua

nho nguon

Phan
dinh

11 - 12 ngay

song

dong

cua

voi bien

cac dong

c6 dia

bang

trieu

Tien

long

Luoc,

Mia dai 3

18km,

18 krn, trung

va nhat

trung

binh

rong

kha thuan

nhat.

trieu

(rnoi

Ian va 2 - 3 ngay

bien

ngay

trieu

d¢ trieu

co

kern,

nho. D¢

6

song

Thai

Van

Oc va Thai

tich cac giai dean

thong

luc - hinh thai trong
long

song,

Binh,

gan

tri cua moi

moi quan

M gitra

cac can cat - d u o n g

ky nao, song nao co vai tro tru the deu

thai

cua song Duong

khu vue Tay Nam Do

noi rieng,

d¢ uon khuc

q u y e t d in h ,

1 9 tren anh ve tinh SPOT

long

Lang

phan

tich dong

c6 d a bi suy tan.

diroc 4 vi tri cua

cuong

dan cua song

trio Viec

phan

he voi song

mroc v a p h u sa

tich

dai

dai

co che d¢ nhat trieu

Voi bien d¢ trieu

dong

gill vai tro thong
quan

Hoa

Luoc

co song

co'

diroc can cu vao phep

huang

song

song

1 ,2 m 1 s ;

Song

0 ,6 m 1 s ;

tren can

binh 2,5 - 3m.

T h a i B in b

su boi tu phat

chay

co 2 Ian nuoc Ian va 2 Ian n u o c rang)

ngay

3 .2 . C a c lo n g s o n g

noi chung

0 ,8 m 1 s :

va ven bo Tien Lang

Ian trieu cue dai toi 4m, trung

con song

chay

chay

chinh

0 ,6 m /s .

OIIa thang
(moi

h~ voi hai song

100 m, sau 7 m va dong

Ion, mot Ian mroc dong).

ban nhat trieu

San

va quan

sau 3m va dong

chay

cira song Thai

ky trieu

rong

sau 4m

80m, sau 3m va dong

Lang

Binh,

narn

1998

vi tri hien

va ban

do dia hinh,

da xac

nay va 3 vi tri cua long

song

c6.
Long

song

c6 thir nhat

(LI)

narn

Cap Tien,

heat

dong

tich cue trong

c6 thang,

phan

diroi

thuoc

Cap

gitra Khoi
thai

Tien

Nghla

gian khoang

bi uon

khuc

va Quyet
3000

rnanh,

Tien,

- 2000
ban

kinh

d6 ra cira a xa

narn. Ph an tren song
cong

rat nho.

Luc


THONG TIN KHXH & NHAN VAN HAl PHONG

nay ca hai song Thai

Binh

va Van Dc deu hoat dong

h o n XWVUTSRQPONMLKJIHGFEDCBA
a thai gian d a u , Song Van Dc h e a t

m anh

Long
Dean

song

Lap,

c6 thtr hai (L2)

nhap

CI!C trong

vao dong

khoang

thai

ke thira dean

tren

a

Phuong

hien

gian

dong

nay

2000

x6m

- 1000. narn

manh.

rnanh
cua

Song

Thai

nam TSRQPONMLKJIHGFEDCBA
a dia phan

dtroi

Doi xa Tien
Long

dong ZYXWVUTS

heat

a 1lI1a sau thai gian.

hon

L 1, doan

tnroc.

Blnh

37onmlkjihgfe

Minh,

song

heat

dong

c6 bi u6n

tich

khuc

rat

manh.
Long
Nghia,
Lap.
u6n
Long
trien

song

c6 tlnr ba (L3)

mot dean

ngan

L3 u6n khuc
thoai

hon

song

khac

rat rnanh,

va nhap

xoan

vao

c6 thir ba hoar

dong

chay

rnanh

song

da trai qua pha heat

maio Trong

khi song

cira song
chiu
can

manh

tac dong,
h6a

thuy
each

lam

can

dao song

giao

narn truce

cung

dong

song

pha tan,

khi dao song
sau song
chung

nhung

dieri

narn

voi

tnroc,

rat rnanh,

ADN,
cua
thuc

sau d6

song

H6a.

chat

phat

heat dong rnanh

song

u6n. Sau mot thai

gian

heat

dong,

n6 lai

manh

hen

nay vao khoang

va tra thanh

ep nr phia

tru the. Thuc

tay nam

thong

qua

hinh

pheu

lai cira,

ngiroi

lam

1936 (la song

trong

Thai

khi cira Van

mo loe ca hai phia. Qua

h6a,
song

da can thiep

te, ca hai

len. Cira song

nay va dan den bi boi can,

qua trinh

500

va da buoc vao dau pha suy tan

cu6i cung

Thai

Binh

mat

d~ giai

quyet

van de nay

loi

the

c6 te b] suy tan vao khoang

tu nhien

da dien ra cua cac dong

Van

Dc).

K~ nr d6 song

Thai

song Thai

Blnh

va Van

va mot pha suy, pha dau hung

thinh

va pha sau suy tan,

nr cai tao lai dong

Binh

nhip

true

hon.

tram

hoac

Thai

pha tan. Theo

a

doi

- 500

voi t h a i ky suy tan song

1000 narn, voi mot pha thinh

sang

manh

dong

vao narn

suy tan c a n g nhanh

cua dong

dong

Yen Ha NOi. Con

Moi

Moi chu ky thang

a

1000

cau

sang vi tri gan nhu hien

cua qua trinh

tro

VI!C xa Khoi
a phi a dong xa Dean

tai khu

lay h~ truce.

chuyen

gan nhtr dang

den Hung

chuyen

cac khuc

xcan

Van Dc heat

tac dong

1000 - 500

phai

khoang

bi cac de cat tre moi tao thanh

deu

Dc it chiu

B in h

nay tai vi tri gan

trong

m oi

narn truce,

bang

hien

"cat cong"

Sau khi bi suy tan, dong

trinh

ngan

lay L2 c6 h o n tao nen hlnh

dong

suy tan, tao nen h e u6n cong

duong

voi Ll
thi tran,

dean

ke thira tren L2. Sau khi L2 suy tan va uon khuc

tra lai, dong

Binh

chung

voi L2 tai phia Nam

c6 mot

chung

d~ buoc sang

va Van Dc luan d6i nhau.

dieu

nay,

song Thai

Binh

c6 ve tan lui k h a nhanh.

chu

Song

nay

k y maio

a

Nhtrng

bien

SI! hung

pha thinh

vira trai qua pha thinh,
cO' gan

Dc khoang
thinh

thi song kia

bat dau chuyen

70 nam

qua,

k~ tir

Mci la het sire to Ion, VI ur vi tri thir hai trong cac con song Bilc K y , chi

Hong,

n6 gio

ta c6 th~ c6 mot

Qua Khir, da tung

mang

chi la mot
cai nhin

lach

khac

song

hen

nho.

Neu

ve cuoc

ten cua ca mot he thong

khong

co sir kien

doi cua mot dong

song,

mot dong

bang

song
chau

song

Moi,

Ian trong
th6 rong

Ian.

3.3. Cac lach trieu tan.
Narn sau cac de cat deu c6 cac dai dat trung
dam pha (lagoon).

Theo

thai

gian,

chung

thap va lach trieu,

cau tao urong

bi boi can dan va mot so' lach

trieu

nr cac

c6 d~ lai


•.

38

THONG TIN KHXH & NHAN VAN HAl PHONGonmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA

cac dau vet diroi dang cac muong lach chay song song vci duong bo. Phan tich anh ve

tinh thay ding co hai lach trieu c6 can de lai dau vet ro. Lach thir nhat narn TSRQPONMLKJIHGFE
a phia bac
xa Tien Minh, phia trong de cat - dirong be c6 1000 nam
phia nam xa Tien Minh,

tr u c e .

Lach thir hai narn

a

a khoang giua dirong bo c6 1000 nam va 500 narn tnroc. Hai

lach nay xua kia co te kha sau rong, co kha nang gan noi thong song Van Dc voi Thai
Binh. Trong qua trlnh duong bo Ian ra phi a bien, chung dan bien thanh mroc, ngot va
tra thanh phu hru cua song Thai Blnh,

6

mot vai noi, lach trieu bi ngot hoa nam sat

cac de cat cao, rat thuan loi cho dieu kien song quan cir cua con nguoi. Chung can tao
nen su giao hru bang duong thuy trong pham vi vung dat narn gitra hai song Ian.

Ket luan.
Trong qua trlnh boi tu 3 nghin nam qua cua dong bang Tien Lang, song Thai Binh
nhieu Ian hoar dong manh, suy tan va de lai dau vet cua 3 long song c6 tao thanh cac

deli trung thap, nhieu ho dam. Khi heat dong tich Cl!C, chung teli phu sa ra cira song boi
tu nhanh va tao nen cac de cat chan cira va roi chinh cac de cat nay phat trien thanh

M

thong boi tan lach cira. Ben canh cac lach song tan, can co cac lach trieu tan ma

trong cuoc doi cua rnlnh, chung co hie tro thanh cac lach song phu hru ciia dong chinh
Thai Blnh.
Co the noi ding, trong qua khtr khong xa, song Thai Binh la con duong giao hru noi
thuy

het

sue quan trong, VI ur cfra song nay deu co the nguoc dong ve phi a tay bac

theo song Luoc vao song Nam Dinh va den Ha NOi va cung de dang

ngucc

ve phi a tay

bac len song Duong, song Cau. Neu co mot thuong ben narn a tren song, gan cira Thai
Binh thl "vung hap dan" cua no, noi theo ngon ngn hien nay, bao trurn len toan bo hru
Vl!C

cua he thong song Hong va song Thai Blnh.

Chinh su bat dau suy tan ur nhien cua song la 1 9 do de dao song Moi va sir ra doi
song Moi lam song Thai blnh tan di cang nhanh. Viec nay da gay nen mot so tac dong

quan trong, trong do co d

gia cuong 10 tren he thong song Thai Blnh, tang cuong sa

boi Iuong vao cang Hai Phong va nhiern man tren song Thai Binh .•