I KHOA HOC ^ j . i 5 r j ; M ! i ^
DANH GIA KHA N.4NG THO.AT LO CUA SONG H 6 N G KHI N^O \ ET, H4L TH.4P CAO DO CAC BAI SONG
Sguyin Ng,c Ding. Nguvin Ng,c Quynh, Nguyin Manh Linh Phdng Thi nghifm irpng diem QuScgia ve Ddng IfC *(«^f " « J ^
U Xuan Tnang Sir Ndng nghiep va Phdl Iriin ndng Ihdn Hd Not T i m tit: .\7i<im ldng khd ndng Ihodt IH ciia song Hdng. gldl phdp ngo vel. hg thdp cao dp cac bai sdng da dufic di xudt. Tuy nhien, casdiy hidn vd ihifc lien di chung rninh ciing nhu danh gid hifu qud cua gidi phdp tren van chua ro rdng. Nqi dung hai bdo ndy ke thua mgi so kei qua nghien ciim trudc ddy nhung cd cgp nhdt cdc Ihdng so mai ve ddc Irung hinh hgc, hmh that long din cua dogn sdng Ogi difn Ire uing Hong, lir dd dua ra kil qud nghien ctiu ddy dli halt de ddnh gid hifu qud cing nhu giai hgn cua gidi phdp ngo vet. hg thdp cao dg cdc bai sdng ddi vai vifc cdi thifn klid nang Ihodt IH tren sdng Hdng.
Tir khoi: khd ndng Ihodt IS: ddc tnmg hinh thdi
Summary: In order lo increase Ihe flood drainage capacity of ihe Red River. Ihe dredging and lowering solutions of river ftiyodplain haw been proposed, but the theoretical and practical basis to prove also as assessed the effectiveness of this solution is slill unclear. The content of this article inherits some previous research results but has updated Ihe new model (MIKE 2IFM) and new parameters of geometry, morphological form ofthe typical river section, thereby giving the results more comprehensiw research results lo evaluate the effectiveness and limilalion of this solution to improve flood drainage capacity ofthe Red River.
Keyviorils: flood drainage capacity: hforphological characteristic
I. D^T V A N Dfe
V i ^ Iriin khai quy hoach phdng c h ^ g lu iti Ih6ng s6ng H6ng, sfing Thii Binh d i d i xuit giii phip nao vdt, ha thip cao trinh mpt so bii sdng hit til sdng H^ng vdi myc dich dam bio khi ning thoit IQ thiit ki Irong tnidng hgp cho phdp khai thic cic bii sdng. Theo tinh loin quy hoach, cic bii sdng dupc d i xuil ha thip din mdt s6 cao dd k U c nhau +2,Sm;
+3,0m;+5,0m[3.4].
Cii lao. ha thip bii sdng di gia ling kha ning thoit lii cbo mpt con sdng li mdt Irong nhitng
Ngiy n h ^ bail 27/3/2020 Ngiy Ihdng qua phin bi^: 17/4/2020 Ngiy duyft ding: 20/4/2020
giii phip Ihudng dupc xem xdt Tuy nhien, vi?c xic djnh gidi han hay cic tham sd nao vdt bit budc phii tuin thu cic nguydn tic rit CO bin cOa chinh trj sdng miia liL Cii thi la: Hinh dang mJt bing cua tuyin nao vdl, ha thip bii; Pham vi hay chieu ldng gidi han tren bii sdng cho phdp nao vdt; Cao dp nao vet di dam bio dat dupc muc dich Ung kha ning thoit IQ, ding thdi khdng gay ra cic tic dpng bit lpi din dn djnh long sdng («c biet li dv bio khi ning bdi lip lai bii sdng tai cic khu WC nao vdt, ha thip.
Til cic kit qui nghiin cim mang tinh ly thuyit v i thwc td tten sdng Hing trong nhiiu nim qua vd, cic ^ g e u linh toan tren md hinh toin 2D, mo hinh vjt ly long cimg v i ldng ddn.
nhom nghien cim cua Phdng thi nghidm trpn^
T/kP CHl KHOA HPC VA CONG NGHC 1>40y l a SO »-2020
diem Ou6c Gia vg dpng luc song bien da dua ra cac phan tich. danh gia co co sa khoa hoc \ e mirc dO gia tang kha nang thoat lu khi nao vet.
ha thap bai ma cu th§ la dua ra cac giai han pham V] vc chieu rpng. chieu sau co the nao vet tren bai song.
Cac ket qua nghien cuu lien quan den van tren se lan lugt trinh bay, cong bo trong mpt so bai bao. Trong bai bao nay se trinh bay ket qua nghien ciru hi?u qua va giai han cua viec ha thap cao do bai song den kha nang thoat lu tren song Hong.
2. P H U O N G PHAP LUAN, C A C K I C H B.AN VA C O N G CV NGHIEN ClTU 2.1. Phuong phdp luan [1]
Phuang phap luan dat ra cho nghien ciru hieu qua ciia ha thap cao dp bai song doi vai kha nang thoat lu dua tren cac can cir sau:
Tir cac tham so thuc te cua mpt doan song Hong (chpn doan song Hong lir San Tay den Hung Yen) nhu: hinh thai mat bang, mat cat ngang. mat cat dpc, he so nham, dp doc thiiy lire, cac thong so thiiy van - thuy luc lu... se thiet lap mot doan song mau voi tuyen chinh tn va tuyen thoal lu linh toan.
- Tren co so doan song mau, thict lap cac kich ban tinh loan vai yeu to thay doi chinh la cao
I KHOA HOC M ^ j i g ^ g j ^ j
dp bai song (Zh) co xet den cac \eu to tac dpng la chieu rpng thoal lu (Bu), ban kinh cong dai dien (R^) ciia luyen chinh tri va sue can tren long, bai song.
- Su dung mo hinh toan 2D voi Iuoi tinh linh hoat, mo phong dupc cac yeu to hinh hpc. hinh thai va che dp, dac trung dong chay lu tren mat bang, mat cat ngang song.
2.2 Thiet lap doan song mau [ I ] u. Chon dogn song mdu
Doan song mau lira chpn dua tren so do hoa mpt doan song thuc tc Iron song Hong tir Scm Tay den Chem, trong do doan song trpng diem de xem xet chi liet su thay doi cac yeu to hinh thai la doan cong Trung Ha (bao gom ca phan chuyen tiep o thupng va ha luu), day la doan song CO sir bien dpng manh tren mat bang trong giai doan 2003-2007, on dinh trong giai doan 2010-2015, co dau hieu bicn dpng tra lai tir cuoi 2016 den nay.
b. Cdc thong so ve ddc diem dja hinh, long ddn, hinh ihdi. thuy vdn. thuy luc dogn song Dua tren so lieu dia hinh doan song do 2017.
2018; hien trang mat bang ba bai song, cac thong so hinh hpc, hinh thai song va cac dac trung thiiy van, Ihiiy luc. Cac thong so linh toan cho doan song mau a bang 1 va mo ta a hinh 1.
Bang I: Cac thong so cff ban song Hong doan Son T a \ - Chem de xay d u n g doan song man TT
1 2 3 4 5 6
Cac thong so dia hinh thai va thuy van, thuy luc Chieu sau on djnh tinh toan doan song Hdng Son Tay ~ Chem: Hi,(m) Chieu rgng on djnh doan song Hong tir Son Tay - Chem: B„ (m) Luu luong tao long Qo { mVs) Chieu rong long song chinh hien tai, nam 2017: Be (m)
Chiiu rong tuyin thoal lu: B,i (m) Ban kinh cong long song: R<: (m)
Gia trj tinh toan 8 , 5 0 - 8 , 7 5
6 9 6 - 7 1 0 10.700 1 0 5 0 - 2 7 0 0 ( l , 4 - 3 , 8 ) B o 1 2 0 0 - 4 5 0 0 ( l , 5 - 6 ) B o 1 4 0 0 - 4 9 0 0
(2 - 7)Bo
Ghi chu Ket qua bao cao: Tac dpng ciia hg thdp long ddn den che do thiiy vdn vd hinh thdi long ddn song Hong (Tap chi KHCN Thiiy loi 9/2016)
So lieu thuc te ve chieu rong va ban kinh cong pho bien tren doan song
TAP CHl KHOA HOC VA C 6 N G NGHE THUY LOI S 6 59 - 2020
I KHOAHQC"
Cic Ihdng sd dia binh Ihii v4 duly 1 ^.^ ^ ^ ^ , ^ van, Ihuy l^rc
Pd d ^ tnmg binh bii sdng: It, 5.it\ 10"' Cao dp trung binh bii sdng: Zo (m)
- Doan diu (Son Tiy)
• Dojn cudi (Chdm) Hf s& nhim Idng va bii sdng
Hd so nhim Idng: ni Hd sd nhim bii: Ub Luu lupng Ifl thiil ki Qit (m'/s) M ^ ninSic thiit ki (ro):
Bien trdn Son Tiy Chdm (bidn dudi)
13,00 10.75 0,02 +0,04 0.05-i-0,10 26.100
18,0 16,1 13,9
Ghi chu Sd lidu thtrc ti trung binh trdn doan sdng
Sd lidu nhim md phdng thvc ti doan sdng
Tinh vdi 10 TK 300 nim (QB sd 3032/QD-BNN-TCTL ngiy 19/7/2016)
c. Cdc thdng sd ctia do^ sdng mdu TCI cic Ihdng s4 doan sdng thirc te (bing 1), vdi mgc tidu chinh l i dinh gii sir biin dpng cda yiu l i cao dd Irung binh bii sdng hay l i sv
ha thip cao dp trung binh bii sdng (Zb) deii khi ning thoit lu, vi vay se gidi ban cac ydu td khic d mpt s6 gii tri nhit djnh.
Hinh I: Sado mat bdng nghien ciru cho doan sdng mdu
Hinh 2: Sa dd mqt cdi ngang nghien cuu cho dogn sdng mdu
B i n g 2: C i c thdng so car b i n cua doan sdng mau TT Cac thdng sd dja hinh-hinh Ihii v i
thijy vin thuy lyc Chidu sau dn djnh sdng mau: Ho(m) Chidu rpng dn djnh sdng mau: Bo(m) Lmi lupng tao Idng Q, (m'/s) Chidu rpng thoit lu: B,i (m)
Gia trj tinh toin
700 10.700 Bin kinh cong long sdng: Rt (m)
E)p ddc trung binh bii sdng: lb Cao dd tiung binh bii sdng: Z„ (m) - E)oan diu (Son TSy) - Doan cuoi (Chdm)
2,5 B„
Ghi chu
ChsnOLeifiiBjidaidito 5 , 8 x 1 0 ' '
13,00 10,75
C h p n M ^ i t t j R ^ ^ i ^ Theo Ihtic te
Theo thyc t i
TAP CHl KHOA HQC VA CONG NGHE T H O Y L d s d 59 2020
KHOAHQC MJ.Hrel?M!l:M
TT 8 9 10
Cic thdng si dja hinh-hJnh thai va thiiv vin thiiy Iiic Hp s6 nhim ldng va bii sdng - He sd nhim Idng sdi^: ni - Hp sd nham bai sdng: nh Luu lupng lu thiit ki : Qtk (m'/s) Mvc nudc 18 ting vdi Qa (m) - Thurpng luu Sen Tiy 10km - Son Tay
- Chdm
Gia tri tinh loan 0,02+0,04 0,05+0,08 26.100
18,0 16,1 13,9
Ghi chu
Chpn 02 gia tri dai didn
Theo thuc ti
23 Kjch b&n nghien cihi, Hnh todn [1,6]
2.3.1 Xay dgrtg quan he giita kha nang thodt lu vdi biin d0ng cao do trung binh bai song.
Trong cung m0t dilu kien lun tugng lu tinh loan, kha n3ng thoit lii cua doan song/con song dugc ddnh gid trgc tilp qua gia tri myc nucrc lu hoac gidn tiep qua quan he (H/HQ), Quan h@ gi&a khd ndng thodt IH v6i biln d$ng cao d$ bdi song the hi^n qua biSu thuc:
-f(-^;Rc) (1) Trong d6:
- Kha ndng thodt lu dugc danh gia gidn tiep thong qua ty I§ (H/Ho) Id tham so khong thii nguyen, trong d6 H la muc nudc lu tinh toan; Ho la chiSu sau on djnh long ddn doan sfing mdu.
- Biin dpng ciia cao d$ bdi sdng dugc danh gia gidn tilp thong qua ty le (Zb/Zo) la tham s6 khong thii nguydn, trong do Zb la cao dg trung binh bdi sdng; Zo la cao d6 trung binh bai song hi^n trgmg tuong ung voi chieu sau on dinh cua 16ng din.
- Dac diem hinh d^ng m$t bang cua tuyen song ciing CO dnh huon^ den khd ndng thodt lii dugc xem x6t qua yeu to bdn kinh cong Re.
- Khd ndng thodt lu (H/Ho) Id ham s6 cua 2 tham so la: bien dgng cao dg bai sdng (Zb/Zg) vd bdn kinh cong cOa do^n sdng Re dugc thd hien qua bidu thuc quan he (1).
- Voi muc dich ddnh gid chinh Id tde dgng cua ydu td cao dg bdi sdng vd hinh dang mdt bdng tuydn sdng, trong kich bdn nghidn cihi, c6 cdc gid thidt sau:
+ Chua xem xet dnh huong cua chidu r^ng thodt lu rad mac djnh chgn gid tri chidu rgng thoat lii trung binh cua cd dosm sdng nghidn cihiBu = 2,5Bo.
+ Bo qua ydu td sue cdn ciia ldng (ni) vd bai sdng (Ub), cdc gid tri ni va nb dugc m^c dinh trong khoang gid trj nhdt dinh.
2.3.2 Chi tiet kich bdn tinh todn a. Kich ban ve bien dgng cao dg bai song TIT cac phdn tich trdn, chi tiet kich ban thih todn thd hien trong bdng 3
Bang 3: Chi tilt kich ban tinh todn quan hd giira mvc nvd^c Ifi vdi biln dgng cao do trung binh bai sdng
TT
1 2
Cac miic ha thap cao do bai sdng Zb
so vdi cao dp bai sdng hidn trpigZo
AZ(m) 0,0 0,5
Zb/Zo
1,000 0,958
Hfflo=f(|^;Rc)
R=2Bo X X
R=3,5Bo X X
R=5Bo X X
R»5Bo X X
TAP CHl KHOA HOC VA CONG NGHE THUY LOI S 6 5 9 - 2020
KHOAHQC
TT
Cac mOic ha thip cao dp bii sdng Zb
so vdi cao dd bii sdng hidn Ufng Zo
AZ(m)
JA.
JA.
-ML
JA- JA.
JA.
z»«,
0,875 0,833 0.750 0,708
H/H<r=r(^:R.)
* 0
R=2Bo R=3,5Bo R=5Bo
Chi chu: trong kjch bin tinh loin chi tiit g i i Hi ni nong khoing lii 0,2+0,3 vi nb 140,5+0.6
b. Kjch bdn thdy vdn
Tidn doan sdng mlu, tinh v6i 01 kjch ban Ifl thiit ki 300 nim, md hinh Ifl 1996 v i sii dvng cic kit qui m^c nudc bidn diu vio, bidn cii6i v i tai v) tri tiam thiiy vin Scm Tiy.
Z.4. Cdng cv nghUn cftu - thiit \^f md Unh MIKE 21FM [2,5,6]
Vdi c i c ydu c i u nghidn ciiu v i kjch bin tinh toin, nghidn ciru ndu trdn d i sii dyng md hinh MIKE 21 lim cdng cv md phdng v i tinh toin. Md hinh MIKE21 FM di dupc thiit l | p cho do«n sdng mlu vdi pham vi nghidn ctiu d hinh 1.
2.4.1 Thiil hfp md hinh
Trong pham vi bii bio chi gidi thidu kit qui chfnh md ti vi$c thiit l$p md hinh thdng qua mdt s& hinh dai didn
a. Thiet Igp dja Mnh vd ludi tinh todn
Hinh 3: Thiil ldp dja hinh doan sdng mau thvc t i
Hinh4: Thiit l^phiditbih todn cho dogn song mdu b. Bien md hinh
Bidn luu lupng: lai Son Tiy vdi (Jtk = 26.100 m'/s
Bidn muc nudc:
+ Bidn trdn (thupng luu TV Son Tay 10 km):
18,0 m
+ Bidn dudi (C^idm): 13,9 m + Mpc nudc tai Son Tiy: 16,1 m 2.4.2 Van di him djnh md hinh thuy life 2D Vide a i m djnh md hinh thuy luc 2D cho cic doan sdng/con sdng mlu di dupc so do hda v i trung binh hda, vi vay khdng hoan toan toan theo cie ydu d u kiim djnh thdng thudns Vide xem xdt sv phi. hpp cia md hinh thuy luc dd, vd. d o ^ sdng m i , tuy ihujc vio muc dieh tmh toin. Trong mrdng hpp chi xem xdt'yiu td mvc nudc himg binh mCia Ifi thi chi ein xem ttit sv phu hpp cua cie gii Ui ^^^ „„^ "
mdt hojc mdt s^ didm d«i didn dupe tirf, J ' trtn md hmh doan sdng mlu vdi e r g i s t ^
TAP CHl KHOA HOC VACONGNGHtTHOy tgi S6 59-2020
KHOA HOC
aassi^
Trong trucmg hgp co si; khac biet 1cm, vice hi?u chinh he sd nhdm/surc can Id can thiet de dam bao sg phii hgp tuomg ddi voi thyc te.
Tuy nhien cac gia trj h? sd nham dieu chinh khdng vugt qua khoang gidi han ciia he sd nhdm Iren doan song thuc te.
Cu the trong bai toan nghien cuu nay, sau khi hicu chinh he sd nham long sdng va bai song 6 cac khu vuc khdc nhau deu trong khoang ni = 0,02^0,03 va nh = 0,05-0,06 thi dat dugc gia tri muc nudc lu tinh toan tren md hinh 2D cho do^n sdng mau tuong ddi phii hgp vai muc nudc lu thyc te doan sdng.
Trong bdi toan tdng qudt vdi doan sdng mau da sir dung yeu td muc nudc ung vdi lu thiet kc dc kiem dinh, ddng thdi lu thiet ke cung la kjch ban thiiy van trong tinh toan quan he giija kha ndng thoal lii vdi bien ddng cao do trung binh bai sdng.
Hinh 5: Kei qud linh todn muc nudc hi ihiet ke tren dogn song mdu
Hinh 6: Ket qud iinh todn van idc vai lu ihiet ke tren dogn song mdu 3. XAY DL1"NG QUAN HE GIUA KHA NANG T H O A T LU v 6 l BIEN DQNG C A O DQ TRUNG BINH BAI SONG 3.1 Ket q u a tinh todn
Bang 4; Ket qua tinh toan quan he giira m u c n u d c lu vdi bien dong cao do t r u n g binh bai song
TT
1 2 3 4 5 6 7 8
Cac mtrc ha thap cao do bai song Zh so vdi cao dp bai song
hien trang Zo AZ(m)
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5
Zk/Z,,
1,000 0,958 0,917 0,875 0,833 0,791 0,750 0,708
H / H „ = f ( ^ ; R J
R=2B„
1.3145 1.308 1.3025 1.298 1.296 1.294 1.293 1.292
R=3,5B„
1.3145 1.305 1.298 1.292 1.288 1.285 1.2835
1.282
R=5B„
1.314 1.303 1.295 1.2885
1.285 1.281 1.279 1.277
R » 5 B „ 1.314 1.3015 1.2845 1.274 1.268 1.264 1.261 1.259 3.2. Xay d u n g quan he
3.2./ Biiu do quan he - / T — -R )
TAP C H l KHOA HOC VA C O N G N G H E THUY LOl SO 59 - 2020
Hinh 8: Quan he ^ ~f(^ .RJ Ho A tlinn B: t^uan ne — Jt — -'^
3.2.2 Bleu thuc quan hf H Z
a. Biiu thirc quan hf f(':r> "** """S gid iri bdn kinh cong Ho 2o
.VHR.=2B,. - ^ = 0 3 2 ( | ) ' - 0 , « ( | ) + l . 5 :
.ViiR.=3.5B,;-^ = 039(|)=-0.56(|].1.5:
.V,iR.=5B„; -^=0.42(|)=.0,60(|]^1,5:
.V,iR.»5B.; ^ = 0 , 7 « ( | ) ^ . . , . 3 ( | j - 1 . 5 . b) Biiu thiic Idng qudt
Trong dd kl vi k: li cic hd sd liy tir bing dudi day:
' K. =2B. R,=3.5B.
(2)
(3)
(4)
(5)
(6)
0,82 0,86 1.0 1,0 1,07 1,07
R,»5B,
2,0 2.0
3 J. Trao dii vi thio lu|n ui A nio dd, mvc nudc Ifi H sd hau nhu khdng Vi hidu qui gia ling khi ning thoit lu khi ha '''™ ""*' C^ " ^ "^Sng ding ki), cd nghTa la thip cao dd bii sdng: tir cic bidu dd quan hp 8iam cao dp bi. song sd chi lim ting kha ning tren hinh 8 vi cic biiu thiic tii (2) din (6), cho * ° * ' ' " """K •"?' gi« han nhit djnh thiy khi ha thip cao dd bii sdng din mpt gia Bdn canh dd vide nao vdt, ha thip cao dd bii
• TAPCHlKHOAHPCVAC0NGN6H£TMCrifLC«SlJS»-2020
KHOA HQC
msm
song rngt cdch thieu tinh todn, khdng tuan theo cdc nguyen tfic chinh tri sdng con gay bdt lgi den ddng chdy miia ki?t, dkn qua trinh v?n chuyin biln cdt vd ca chd b6i xdi cung nhu dn djnh ldng dan chinh.
4. Ktr LUAN
Vi^c nghien curu ddnh gia hi^u qua thodt lii khi
tang difn thodt lu tren bdi sdng bdng each h^
thdp cao dp bdi sdng cho thdy Id cd hieu qua nhung or miic dp gidi han bdi vi khi ha th^p cao d$ bai sdng den mpt gid tri Zb ndo dd, myc nuoc lii H s€ hdu nhu khdng biln ddt Ve ung dung: ket qud nghien cuu dupc the hien dudi d^ng bieu thvrc:
'-0,56.k2p^ 1+1,5 Trong dd md td quan h? giiia yeu td myc nirdc lu vdi h^ thdp cao d$ trung binh bdi sdng khi x^t d£n ylu to bdn kinh cong long sdng chinh s€ t^o ra CO sd khoa hpc thuydt phuc hon khi tinh todn khd ndng cdi t^o h^ thdp bai sdng t^i m$t s6 doan sdng thyc td.
Ben c^inh cdc ylu t6 tde d$ng din khd nang TAI LI|:U THAM KHAO
thodt lii nhu cao dp bdi sdng, hinh d ^ g m$t bdng va bdn kinh cong ldng din chinh cdn cd mpt sd yeu td tac dpng khdc nhu sure cdn trSn sdng, chilu rdng vd hinh dang m$t b^ng ciia thodt lii. Cac ylu td tde dpng din thodt Iii chua dupc xet din trong bdi bdo ndy sS tiep tyc dupc ngjiien cihi tinh todn sau.
[I] Nguyin Ngpe Qu^mh (2006), Nghien cuu xdc lgp quan hg hinh thdi long song vcn khd ndng thodt lu tren song Hdng dogn San Tdy-Hung Yen, L u ^ dn Tiln sT ky thudt, Vi^n Khoa hpc Thuy lpi, Hd Npi;
[2] DHI (2016), MIKE21 FM, Manual;
[3] Quylt dinh sd 257/QD-TTg ngay 25/3/2016 cila Chinh phu vl vi?c phe duySt rd sodt quy hogch phong chong lu va di dieu kg thong song Hong, song Thdi Binh;
[4] Vi§n Quy ho^ch Thuy lpi (2018), Rd sodt quy hogch phdng chdng IH chi tiit tren cdc tuyin sdng CO de thugc thanh pho Hd N6i.
[5] Trdn Dinh Hda vd nnk (2018), Nghien cuu tong the gidi phdp cong trinh dap ddng nu&c nhdm ung pho tinh trgng hg thdp mifC nuoc, ddm bdo an ninh nguon nudc cho viing hg du song Hong, D I tdi cdp Qudc Gia, Vidn Khoa hpc thiiy Ipi Vidt Nam;
[6] Nguyin M^nh Linb, Nguyin Ngpe Ddng (2018), Bdo c ^ thuy l^c md hinh MIKE 21 FM thu0c dl tdi cdp Bp Nghien cuu di xuat gidi phdp su d^ng hf/p Iy viing ddt bdi ven song di ndng cao hieu qud phong chong lid cho song Hdng va song Thdi Binh trong diiu kien biin ddi khi hdu, Phdng TNTD QG vl dpng luc sdng bila
TAP CH( KHOA HOC VACONG NGHeTHUY IQ\ S6 59- 2020
