NGUYEN NHAN VedcbaZYXWVUTSRQPONMLKJIHGFEDCBAA GIAI PHAp KHOA HOC CONG NGHEPHONG CHONG XOI SAT CAC'DOAN B da tra thanh mot doi hoi cap bach, mot nhiem vu quan trong diroc Chinh phu 1 7 ,2
Trang 1H a i P h o n g , t h a n g FEDCBA 1 1 /2 0 0 8YXWVUTSRQPONMLKJIHGFEDCBA
H O I T H A O
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X O I L a B O B IE N V IE T N A M
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K h o a k y t h u d t b ie n - D H T h u y it;ri
t o a n
v u n g b i e n T h i r a T h i e n - H u e T h s N g u y e n T h i K i m N g a
C N D U O 'n g C o n g D t i n
v u « C O ' h 9 C
T h s V u t t « T h u T h u y
K h o a k y t h u d t b ie ;1 - D H T h u y 1 9 'i
v u » K H & C N v i« N a m
D a i h 9 C K h o a h 9 C t~ t' n h i e n H N
V i ¢ n T N & M T b ie n
M l , I C l u c
Trang 3NGUYEN NHAN VedcbaZYXWVUTSRQPONMLKJIHGFEDCBAA GIAI PHAp KHOA HOC CONG NGHE
PHONG CHONG XOI SAT CAC'DOAN B<J TRONG YEU
CUA BO BIEN BAC BO
MODAU
B(> da tra thanh mot doi hoi cap bach, mot nhiem vu quan trong diroc Chinh phu
1 7 ,2 km.
1 8 5
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s a u 2m I~Iv u n g boi tu
1.2 Nguyen nhan xoi sat bo' Hai Hau
chfnh cua song Hong tir song So tnroc day d6 VaG ven bien Hai H~u sang vi tri
cua cira Ba Lat cira Day va lam bo Hai H~u lui sau VaG vung khuat phu sa song
manh (ha kien tao va nang chan tinh) c1agay xoi sar bo Hai Hau.
manh liet tir dQ sau 2m tro vao Bao man day dat den do sau 10m Ngoai do sau
10m la vung boi tu yeu.
2.1 Cat Hai
dao tren quan diem dia chat dong hrc va hoc tap, tham khao cac giai phap phong
dong rnanh cua dong trieu trang dieu kien bci tfch bi thieu hut va phan tan manh,
yeu to tac dong cua con nguoi ChLIyell la chat pha rung ngap man, nao, vet luong
ChLIyeu gay ra boi hien tuong bat dang trieu 6 khu vue ven dao Song dong vai
tro true tiep gay sat 16 bo va khuay due day d~ dong trieu mang vat lieu di.
1 8 6
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irng sat 10'cho cac doan bo Ian can
• V i t r i I'a q l l y /7/0 c o n g t r i n h
• Cd u t r u e c u a m o t J :.e m o h a n
C h i e u d a i k e (0) dai 90-l00m voi dau ke ap bo cao 4m/OmHD, gem 2
th u o n g 02 g e m 2 ph an :D2a v a 02b Trang d6 02a la d o a n n o i giira 01 voi 02b,
C h i e n r o n g d i n h k e : 2m
D c ) d o c m a i k e : m = 1:2,5,
D d u J : 2p h i a b i e n voi d(> doc mai l:3
C h a n k h a y : rong 4m, eao 0,5m
Trang 6• K h o d n g e a c h g i i i a c a c m o h i m
-200m
• B i e n p h d p c h o n g l u n v a x 6 i ! d c h a n c o n g t r i n h
tang kha nang chiu tai cua nen cat nira chay, vira bao ve chan c6ng trinh kh6ng
bi xoiedcbaZYXWVUTSRQPONMLKJIHGFEDCBA1 0trang dieu kien dong luc bi~n 6 giai doan dall ke moi diroc xay dung
• T r i n h t u x a y d u n g h ¢ t h o n g k e
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Tren blnh do bai giira hai ke se co hlnh canh cung 16m ve phia l~ICdia Sau mot
danh ca nho cling se la nhirng bai tam dep, phuc vu du lich, giai tri
2.2 Hai Hau
s o n g p h o n g c h o n g x o i s a t b a b i e n H d i H a u , N a m D i n h
C o so ' k h o a h o c , t h u c t i e n v a n g u y e n t d c
thi cao cua gi~li phap cong trinh nay
cho khu virc Cat Hai
T h i e l k e ' s o ' b ¢ c o n g t r i n h
• V j t r i v a q u y m o
1 8 9
Trang 8d i e m d o n g l u c k h a c n h a u 6 t i r n g d e a n b o , n e n c o t h ~ t i e n h a n h b a t d a u xay d u n g
m o h a n v a k e b a a v e t h a n h 3 - 4 C ~ 1 I l 1 n h o N h u v a y s e d e d a n g cha v i e c q u a n l y ,
d u y t u v a t h e o d o i h i e u q u a v a k i p t h a i d i e u c h i n h c a c t h o n g s o k y t h u a t T r a n g
t n r o n g h o p k h o n g c o c a c g a i p h a p h o t r o n h u x a y c a c c a n g nho v a v i r a t r a n g k h u
v u e t h l t o n g s o k e s a u k h i h o a n c h i n h h e t h o n g s e l a k h o a n g 6 8 - 8 6 k e (tuy
t h u o c k h o a n g e a c h g i i r a c a c k e v a p h u t h u o c q u a t r i n h t h e a d o i , d i e u c h i n h c a c
t h o n g s o cho phu hop),
C a u t r u e m o h a n x a y d u n g t r o n g k h u v i r c p h u t h u o c n I t n h i e u v a o d i e u k i e n
C l ; ! t h e ( ; t i r n g d e a n b o v e c a c y e u t o d o n g l i r e , c a u t r u e n e n r n o n g v a m a t c a t b a i
C a c t h o n g s o e l m m o h a n s e t h a y d 6 i p h u t h u o c v a o c a c d i e u k i e n t r e n
Chilli dai thdn ke: t h a y d 6 i t r a n g khoang t i r L05-130m v o i phuong phap
x a c d i n h u r o n g t v p h a n t i n h cha C a t H a i
Doan trong g i a p c h a r t de h o a c b e b a i ( D 1 ) k e o d a i v e p h i a b i e n d a i t i r 2 0
-2 5 m c o d ¢ c a o k h o n g t h a y d o i , u r o n g l i n g r m r c t r i e u c a a n h a t t r a n g k h u v u e ,
k h o a n g 4 , O m / O m H D D o a n n a y d u o c x a y d u n g n h a r n m u c d i c h t a o r a t h e m b a i
c o t a c d u n g b a a v e de, b o
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c a a s e g i a m d a n t h e a d o d o c c u a m a t b a i , t u y n h i e n d o c a o 6 d a u k e p h f a b i e n
n e n l a y l a 1 m s o v o i m u c t r i e u t h a p nhat V ai t h a n h p h a n d o h a t c a t b a i t r a n g
k h o a n g 0 , 1 0 0 - 0 , 1 2 5 m m n h u ( ; d a y , do d o c t u n h i e n m a t b a i s e d a t k h o a n g 1 5
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C a c t h o n g s o k h a c n h u do r o n g d i n h k e , d ¢ d o c m a i , ket cau k e g i o n g nhir
k e r n o h a n t h i e t k e c h o C a t H a i
• Call true doan kepha s6ng
K e d u o c g a n v u o n g g o c v o i c a c m o h a n t r e n , t a o t h a n h d a n g c h i r T N g h i a
l a c a c k e p h a s o n g n a y s e c o h u a n g s o n g s o n g v o i d u o n g b o v a d i n h s o n g t o i
M o t h e t h o n g k e p h a s o n g s e g o r n c a c d e a n k e ( s e g m e n t e d b r e a k w a t e r ) d a t e a c h
n h a u m o t k h o a n g n h a t d i n h
Chieu dai ClICl ke I: m o i d e a n k e n a y c o c h i e u d a i t h a y d 6 i t r a n g k h o a n g
1 = 1 0 0 - 1 2 0 m
Chieu cao ke: c h i e u c a a m o i k e s e b a n g c h i e u c a o c u a k e m o h a n t a i
d i e m n o i , k h o a n g l r n so v o i d ¢ c a a m a t b a i t a i d i ~ m
noi
Chien rong dinh ke: b a n g c h i e u r a n g d i n h k e m o h a n , 2 m
D6 d(3C mdi: 1 : 3
Kef cdu: giong n h i r ke mo han
• Khoang each giiia cac ke
K h o a n g e a c h g i i r a c a c r n o h a n : l a y t h e a h e s o k i n h n g h i e r n , b a n g 2 - 3 I a n
c h i e u d a i t h a n k e 6 k h u v u e n a y k h o a n g e a c h g i i r a c a c r n o h a n l a y t i r 2 0 0 - 2 5 0 m
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vue,
• B i e n p h d p RQPONMLKJIHGFEDCBA c h o n g l u n v a x o i f i j c h o n c o n g t r i n h
D e i v o i c a u true n e n m6ng khu vue nay va tro n g d ie u k ie n d o n g h rc dai b o
• T r i n h t u x d y d u n g h e t h o n g k e
tai ba dean bo: nam Hai Thinh, Hai Trieu va bac Hai Chinh, sau d6 khep kin dan
lien t~ICcac ke cho den phu kin tren roan khu vue bo Hai H~u (hlnh 2) Trhih tu
thuc hien nhu vay nharn dam bao khong ngan nguon vat lieu cho cac ke 6 cuoi
Khi he thong ke diroc xay dung, bai se hinh thanh va diroc nuoi n6i cao dan.
Nguon cung cap boi tlch cho bai gorn c6 dong doc bo va dong vat chat di chuyen
min hon Khi them bai dat duoc be r6ng 20 - 25m thi khi do doan bo nay se dat
diroc trang thai can bang dong, kha nang bao ve de se c6 hieu qua nhat Su c6
mat cua he thong ke chir T nay cling se han che rat nhieu tac dong cua cac dieu
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-KETLUAN
M~c du x6i sat be bien 0 cac dean bo Cat Hai va Hai H~u deu dll dien ra
canh tac, gay nhiem mam, pha huy nha cira, cac cong trinh kien true Song
thieu hut boi tich va x6i sat boo Doan bo Hai Hau chiu su tac dong cua con ngiroi
tich va x6i sat boo
dieu kien Viet Nam D6 la giai phap xay dung ke mo han khep dan tir 2 phia bo'
1 9 2
Trang 11TAl LIEU THAM KHAo
vao dao Cat Hai va buoc dau d6 xuat bien phap cong trinh phong chong chu
Phat trien Nong than Hai Phong
cong trinh, Vien han Him khoa hoc Lien Xo (tai lieu tieng Nga)
6- Dinh Van Huy, Tran Dire Thanh va nnk, 2003 Dac tnrng hinh thai - dong
lire va bien dangedcbaZYXWVUTSRQPONMLKJIHGFEDCBAb o Hai Hau, Nam Dinh Tai nguyen va moi tnrong bien
bien dang bo va giai phap phong chong x6i 16 bo dao Cat Hai, Hai Phong
193