ch4_dieu tiet ho.ppt
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1
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
1
TRNG I HC BCH KHOA TP CH MINH
KHOA K THUT XY DNG
B MN K THUT TI NGUYN NC
PGS. TS. NGUYN THNG
Email: [email protected] or [email protected]
Web: //www4.hcmut.edu.vn/~nguyenthong
Tl. (08) 38 640 979 - 098 99 66 719 PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Chng 1 : Tng quan. Chng 2 : Ti nguyn nc v quy hoch
khai thc Chng 3 : Cc phng php khai thc nng
lng nc. Chng 4 : iu tit h cha thu in. Chng 5 : p dng & cng trnh tho l. Chng 6 : Cng trnh ly nc v dn nc. Chng 7 : Thp (ging) iu p. Chng 8 : ng ng p lc & hin tng
nc va. Chng 9 : Nh my Thu in.
2
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
IU TIT H CHA
THU IN Gii thiu
Phng php iu tit
ng ch thng
3
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
GII THIU
Dng chy thin nhin thay i theo thi gian (ma ma, ma kh).
H cha nhm mc ch tr nc vo ma nhiu nc v tng lu lng vo ma kh so vi lu lng t nhin iu ho dng chy theo thi gian (gim s khc bit v lu lng gia ma nhiu nc & ma t nc).
4
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
GII THIU
Mt cch tng qut h cng ln kh nng iu ho dng chy ln (iu ho ngy, tun, thng, nm, nhiu nm).
5
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
THNG S H CHA
6
MNDBT MNGC
MNC
WHI
VBC
Z (m)
Z (m)
V (mil.m3) F (km2)
V=g(z)
F=f(z)
MNGC: mc nc cao nht xy ra khi c l kim tra MNDBT: mc nc h cao nht khi khai thc bnh thng MNC: mc nc h thp nht khi khai thc bnh thng. Whi: dung tch hu ch h cha. VBC: dung tch cht (cha bn ct lng ng trong N nm)
MNTL
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2
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
THIT LP NG C TNH H (bn t l 1/10000 1/25000)
Fi =f1(Zi) V=f2(z).
i
1ii1ii
i Z3
FFFFV
7
Zi
Fi
Fi+1
Z
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
NH GI KH NNG IU TIT H CHA
h = Whi/Va (01)
h h s dung tch h
Whi dung tch hu ch (niv. Min niv. Max).
Va th tch nc trung bnh vo h trong 1 nm.
- H iu tit ngy : h < 12%
- H iu tit tun, thng: h : 1-2%5-6%
- H iu tit nm h : 5-6%12-14%
- H iu tit nhiu nm h >12-14%
8
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
9
H IU TIT
HON TON
& KHNG
HON TON
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
10
KHI NIM V IU TIT H CHA THU IN
Wn=Wcp Wn> Wcp
Giai on x trn Q n
Q dng
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
11
KHI NIM V IU TIT NGAY H CHA THU IN
W cp nc
G/ tr nc
G/ cp nc
W
tr nc
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Mt h cha thu in nh iu tit ngy m (24h). Lu lng max NM l Qmax=20 m
3/s. Tnh V h cn thit NM chy lin tuc trong cc trng hp sau (gi thit th tch nc n h & th tch nc qua NM trong ngy m l bng nhau):
1. 4 h/ngy-m.
2. 12 h/ngy-m.
3. 24 h/ngy-m. 12
-
3
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Gi thit mt NM thu in c h cha iu tit ngy m hon ton. Yu cu ca h thng l NM s lm vic 5h/ngy, c th:
Ln 1: T 9h 12h
Ln 2: T 18h20h.
Bit rng Qmax ca NM l 18m3/s. Gi thit dng
chy n l u trong 24h. Tnh dung tch hu ch cn c ca h h.
(Chu y: Nguyn ly tinh ging nh tinh dung tich iu hoa trong mng li cp nc).
13
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Hng dn:
14
24h T
Q
9h 12h 18h 20h
Wyc 1=Qmax*3*3600 m3
Qtb=Wyc/24h
Qtb
Qmax
0
H tr nc
W0
W1=W0+Qtb*9h
W2
W3
W4
H cp nc b sung
W5=W0
W ly tch trong h
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
LU LNG & LU LNG CNG DN
THEO THI GIAN
0
20
40
60
80
100
120
140
160
180
1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
Qm
(m
3/s
)
15
Lu lng theo thi
gian Q=f(t)
T (thng)
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
LU LNG CNG DN (ng ly tch lu lng)
Gi Q(t) l lu lng theo t, lu lng cng dn W(t) c xc nh bi:
Vi t cho trc xc nh W(t) c gi l lu lng cng dn.
16
t
tQdttW
0)(
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Trong thc hnh:
Vi Qt c xem l hng s trong thi on t gi l bc thi gian (n v s or h)
17
tQQdttWt
t
t
t
t
00
)(
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
NHN XT
- Ti cc v tr sng ch c dng chy mt chiu ng lu lng cng dn lun tng hoc nm ngang (khi Q=0) theo t.
- dc ca tip tuyn vi ng cong lu tch lu lng lu lng dng chy ti thi im t tng ng.
18
)( ii tgQ
-
4
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
W(m3)
19
0
500
1000
1500
2000
2500
3000
3500
0 1 2 3 4 5 6 7 8 9 10 11 12Ta c: Q5=0 ; Q6 =tg()
ng lu tch l/lng W(t)
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 1 & 2: Tnh v trnh by trn th lu lng v lu lng cng dn W(t) ca 2 chui s liu sau (ly 1th=30ngy). Tnh lu lng trung bnh Q0 (m
3/s).
Thng 1 2 3 4 5 6 7 8 9 10 11 12
Q(m3/s) 70 40 25 20 20 35 40 60 150 170 150 120
Thng 1 2 3 4 5 6 7 8 9 10 11 12
Q(m3/s) 60 40 25 35 120 170 250 400 300 200 120 80 20
[1]
[2]
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Li gii:
0
20
40
60
80
100
120
140
160
180
1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
Qm
(m
3/s
)
21
Chui t/gian Q=f(t)
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Li gii 1 (Q0=75m3/s): Lu lng cng dn:
0
500
1000
1500
2000
2500
1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
W(m
il.m
3)
Thng 1 2 3 4 5 6
W (mil.m3) 181 285 350 402 454 544
22
Thng 7 8 9 10 11 12
W (mil.m3) 648 804 1192 1633 2022 2333
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Li gii 2: Chui thi gian ca Qm
0
50
100
150
200
250
300
350
400
450
1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
Qm
(m
3/s
)
23
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Solution 2 (Q0=150m3/s): Lu lng cng dn
Thng 1 2 3 4 5 6
W (mil.m3) 156 259 324 415 726 1166
Mois 7 8 9 10 11 12
W (mil.m3) 1814 2851 3629 4147 4458 4666
24
0
1000
2000
3000
4000
5000
1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
W(m
il.m
3)
-
5
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 3: Tnh v v trn th lu lng cng dn W:
Thng 1 2 3 4 5 6
Q(m3/s) 30 40 70 90 0 120
Thng 7 8 9 10 11 12
Q(m3/s) 130 200 255 150 100 15
25
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Solution:
Thng 1 2 3 4 5 6
W (mil.m3) 78 181 363 596 596 907
Thng 7 8 9 10 11 12
W (mil.m3) 1244 1763 2424 2812 3072 3110
26
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 4: Lu lng cng dn W theo thng ca chui dng chy 12 thng nh sau. Trnh by s liu ln th v tnh gi tr lu lng ca thng th 2, 5, 8 v 12. Ly 30ngy/thng.
Thng 1 2 3 4 5 6
W(tri.m3) 155.52 220.32 272.16 311.04 336.96 375.84
Thng 7 8 9 10 11 12
W(tri.m3) 458.78 601.34 860.54 1171.58 1689.98 2052.86 27
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
28
LU LNG
CNG DN
TRONG TOA XIN
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
GII THCH BNG THI
29
T
W T*
Lu lng cng dn W=f(t)
(Q0t) Ly tch gi tr TB
0
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
GII THCH BNG THI
30
T
W T*
W=f(t)
(Q0t)
0
W*
-
6
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
GII THCH BNG THI
31
T*
Cng thc tnh W trong to xin:
W=(Q-Q0)t
0
W*
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
LU LNG CNG DN TRONG
TO XIN
Cho chui dng chy Q(m3/s) c lu lng trung bnh Q0. Lu lng cng dn W(t) trong to xin c nh ngha bi:
32
tQtQdtQQtWt
t
t
t
t0
00
0 )()(
Tng th tch nc vo h t t=0 t
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Dng tng qut ca W(t):
33
-800
-600
-400
-200
0
200
400
0 1 2 3 4 5 6 7 8 9 10 11 12
W(m3)
t(s)
QQ0
Q=Q0
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
NHN XT W(t) c th tng hoc gim theo t. W(t) tng khi Qt>Q0 v ngc li. W(t) l c chu k cho chui dong chy nghin
cu Gi tr W ti u v cui chu k l bng nhau. Lu lng dong chy ti thi im t: tg() >= - Q0 (v Qt>=0).
34
)(0 tgQQt
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 1 & 2: Tnh v v ng lu lng cng dn trong to xin (30ngy/thng).
Thng 1 2 3 4 5 6 7 8 9 10 11 12
Q
(m3/s) 70 40 25 20 20 35 40 60 150 170 150 120
Thng 1 2 3 4 5 6 7 8 9 10 11 12
Q
(m3/s) 60 40 25 35 120 170 250 400 300 200 120 80
35
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Li giai 1: Q0=75m3/s
thng 1 2 3 4 5 6
W(mil.m3) -13.0 -103.7 -233.3 -375.8 -518.4 -622.1
thng 7 8 9 10 11 12
W(mil.m3) -712.8 -751.7 -557.3 -311.0 -116.6 0.0
36
-1000
-800
-600
-400
-200
0
0 1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
W (m
il. m
3 )
-
7
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Solution 2: Q0=150m3/s
-2000
-1500
-1000
-500
0
500
0 1 2 3 4 5 6 7 8 9 10 11 12
T (mois)
W (
mil. m
3)
Thng 1 2 3 4 5 6
W(mil.m3) -233 -518 -842 -1140 -1218 -1166
37
Thng 7 8 9 10 11 12
W(mil.m3) -907 -259 130 259 181 0
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 3: S liu W(t) dng chy trong to xin nh sau. Bit lu lng trung bnh dng chy l 80m3/s (1 thng c 30ngy). V W(t) ln th. Xc nh lu lng thng 2, 5, 10.
Thng 1 2 3 4 5 6
W(tr.m3) -15.0 -110.7 -245.3 -380. -520. -620.
38
Thng 7 8 9 10 11 12
W(tr.m3) -700. -780. -540. -310. -110. 0.0
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
NG LU TCH LU LNG & NG B TR TRONG TO XIN
39
ng b tr ca W=f(t)
W(mil. m3)
T(mois) 0
B
A
T0
Lu lng cng dn trong TX W=f(t)
Z Whi C
D
t
Dung tch nc c trong h luc t
Biu th h MNC
Biu th h MNDBT
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
CH
Xt hnh lang gii hn bi ng ly tch lu lng v ng b tr.
Xt mt im bt k M trong hnh lang, KHONG CCH THNG NG t im xt n ng LY TCH biu th DUNG TCH NC C trong h ti thi im t tng ng.
im nm trn ng ly tch H CN: MNC
im nm trn ng b tr H Y: MNDBT
40
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 4: Xet trong ta xin. Cc s liu: A=50tr.m3; B=150tr.m3; C=-10tr.m3; D=50tr.m3. Lu lng TB ca chui Q0=15m
3/s. Tnh lu lng TB thng Qi vi i=1,12 (ly 30ngy/thng).
41
W(tr. m3)
T(th) 0
B
A
Lu tch lu lng trong TX W=f(t)
Z
C
D
tA=1th. tB=2th. tC=7th.
tD=8th.
tZ=12th.
Lu lng hng s t thng 3 7
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 5: Ly s liu bi tp trn. V ng b tr vi dung tch hu ch Whi=80 tr. m
3.
Tnh gi tr lu lng bi cc tia iu tit O1AB1CD1Z.
42
-
8
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Hng dn:
43
W(tr. m3)
T(th)
0
B
A Z
C
D
tA=1th. tB=2th.
tC=7th.
tD=8th. tZ=12th.
Whi=50 tr. m3
A1
B1
C1
D1 01
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp 6: Ly s liu bi tp trn 4 & 5. Gi thit h cn t=0. Gi thit lu lng ly ra khi h cha chy NM ca thng 1, 2 v 3 ln lt l 20m3/s, 40m3/s v 8m3/s .
a. Tnh tng th tch nc ly ra khi h n cui thng 1, 2 v 3.
44
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
b. Tnh th tch nc cn li trong h vo cui thng 1, 2, 3 (ta xin).
c. a s liu nc cn li trong h cu (b) vo th ta xin. T th tnh cc lu lng ly ra khi h tng ng cc thng 1, 2, 3.
45
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
46
IU TIT
H CHA
THU IN
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
IU TIT H CHA THU IN
Qu trnh ly lu lng Qt(t) ra khi h i vo NM pht in (hoc phc v ti,) gi l qu trnh iu tit h.
47
WHI
VBC
Qt(t)
Qn(t) Mc nc h ti thi
im t
MNDBT
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in Mt s ch :
- Sau mt chu k iu tit (ngy, tun, thng, nm, nhiu nm) mc nc h tr v mc nc ban u.
- Qt(t) c xc nh tu theo phng php iu tit.
- Trong qu trnh iu tit, Qn(t) bit (s liu thu vn tnh).
- Qt(t) v Qn(t) >=0
- Qu trnh iu tit khc nhau din bin mc nc h khc nhau.
48
-
9
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Hy gii thch y ngha ng MiMj & tnh trng mc nc h ti cc thi im c bit trn th sau
49
W(mil. m3)
T(month) 0
B
A
Lu lng cng dn trong TX W=f1(t)
Z
ng b tr W=f2(t)
Whi C
D
M0
M1
M2
M3
M4 M5
M6
M7
T0
t0
Th tch nc c trong h ti t0
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Xt h cha c ng ly tch & b tr trong TX nh sau. Gi thit h y nc t=0 & t=T0. Hy xc nh phng n iu tit (th hin bng ng gy khc t t=0 t=T0) Qiu tit min l ln nht.
50
W(mil. m3)
T(mois) 0
B
A
Lu lng cng dn trong TX W=f(t)
Z Whi
C
D T0
ng b tr W=f2(t)
im bt u im kt thuc
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Gi thit h y nc t=0 & t=T0. Hy xc nh phng n iu tit (th hin bng ng gy khuc t t=0 t=T0) Qiu tit max l nh nht.
51
W(mil. m3)
T(mois) 0
B
A
Lu lng cng dn trong TX W=f(t)
Z Whi
C
D
T0
ng b tr W=f2(t)
im bt u im kt thuc PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
BI TP (ly s liu bi trc): IU TIT H
52
W(tr. m3)
T(th)
0
B
A
Z C
D
tA=1th tB=2th tC=7th
tD=8th tZ=12th
Whi=50 tr. m3
0
B
D
Bit rng OABCDZ biu din mt chui lu lng Qt ly ra khi h (iu tit) Tnh cc gi tr lu lng tng ng.
Z
ng lu tch dng chy n trong TX
ng b tr
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Tnh th tch nc vo v ra khi h k t t=0 n ti cc thi im A, B, C. Nhn xt.
Tnh th tch nc cn trong h sau 1th, 1.5th, 4th, 6th, 7th, 10th. Vi gi thit h y lc t=0.
Bi tp tng t vi tia iu tit OBCDZ.
53
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
IU TIT H
54
W(tr. m3)
T(th)
0
B
A Z
C
D
t1=1th t2=2th
t3=5th
t4=8th t5=12th
0
B D
CH !!!
ng iu tit gy khc khng bao gi i ra khi hnh lang gii hn bi ng lu tch v ng b tr.
Whi
-
10
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
NHN XT Xt 1 im bt k thi im t trong
hnh lang gii hn bi ng ly tch & ng b tr:
KHONG CCH THNG NG T NG LY TCH N IM XT BIU THI TH TCH NC C TRONG H TI THI IM XT t.
55
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
56
IU TIT H
THEO PHNG PHP
IU HOA LU LNG NHT
P/P NG CHI THNG
(CT)
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
IU TIT THEO P/P
NG CH THNG
iu tit: iu tit h l mt chui lu lng lin tc ly ra khi h theo thi gian v tun theo mt quy lut c xc nh.
57
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
PP. iu ha nht (pp. CT)
iu tit h theo phng php iu hoa nht l phng php iu tit sao cho s SAI BIT gia lu lng iu tit Max v lu lng iu tit Min l B NHT.
58
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
V d xt 1 h cha c th tch hu ch (Whi) bit.
Gi thit lu lng n h theo thi gian bit (v c ng ly tch lu lng trong TX).
Xem th sau:
59
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
PHNG PHP NG CH THNG
60
W(tr. m3)
T(th)
0
B
A
Z C
D
tA=1th tB=2th
tC=7th
tD=8th tZ=12th
Whi=50 tr. m3
0
B
D Z
Nhn xt: OBCDZ l ng ngn nht ni O et Z
ng iu tit theo p/p ng ch thng
-
11
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
CU HI
Gi thit h y ti t=0 (c th trng thi khc):
i biu l im O
V h cng s trng thi y cui chu k (ging ti thi im t=0)
i biu l im Z
Mt cch nh tnh hy xc nh ng gy khuc (nm trong hnh lang) ni O & Z l NGN NHT.
61
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
TNH CHT
Gia A & Z lu lng iu tit min l ln nht.
Gia A & Z lu lng iu tit max l nh nht.
Phng php iu tit c tnh CC I lu lng iu tit min v CC TIU lu lng iu tit max.
62
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
TNH CHT
So vi cc phng php khc, phng php CT lm cho chnh lch gia gi tr iu tit Max v Min l NH NHT.
Lu lng qua TUA BIN l IU HOA nht.
63
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Hy v tia iu tit theo phng php CT cho 2 t/h: h cn luc t=0 & W=0.5Whi lc t=0.
64
W(mil. m3)
T(mois) 0
B
A
Lu lng cng dn trong TX W=f(t)
Z Whi
C
D T0
ng b tr W=f2(t)
A
B
C
D
Z 0
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp : Xt th :
65
W(tr.m3)
T(th) 0 1 nm 2 nm 3 nm
a b
a b
c
c
Whi
ng b tr
ng ly tch trong TX
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
1. Gi thit lu lng TB ca chui dong chy l 50m3/s. To im a, b l -100 tr.m3 v -700 tr.m3. Tnh th tch nc vo h trong thi on t ta n tb. Ly 360ngy/nm.
2. Cho bit dung tch hu ch l 150 tr. m3. Tnh lu lng iu tit tng ng tia ac v cb vi tC=1nm8th v tung c l -900tr.m
3.
3. Hy cho nhn xt v th tch nc n h & th tch nc ly ra khi h trong thi on t a n b.
4. Gi thit h y lc t=0. V tia iu tit p/p CT. 66
-
12
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Cho dng chy n h cha sau:
thng 1 2 3 4 5 6
Q(m3/s) 70 50 20 10 15 25
thng 7 8 9 10 11 12
Q(m3/s) 40 150 200 250 150 100
67
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Lu lng TB l Q0 =90m3/s. Gi thit h y t=0
v c dung tch hu ch 250 tr.m3.
a. Tnh v v ng ly tich lu lng trong ta xin. V ng iu tit bng p/p CT v tnh lu lng tng ng.
b. Trnh by kt qa trn th v gii thch s thay i mc nc trong h.
c. Tnh th tch nc trong h vo cui cc thng 3, 4.
68
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
d. Mc nc h TB thng 2 v 7 ln lt l 300m v 250m. Mc nc sau NM tng ng l 60m v 58m. Gi thit mt nng (ct nc) l 15% gi tr ct nc a hnh v hiu sut tng NM l =0,85.
Tnh cng sut (MW) pht ra ca NM v nng lng E (tr.kwh) ca 2 thng nu trn.
69
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
PHNG PHP NG CH THNG
70
-1400
-1200
-1000
-800
-600
-400
-200
0
0 1 2 3 4 5 6 7 8 9 10 11 12
A Z B
C
D
E
F G
TIA IU TIT
Whi
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
AB BC CD DE EF FG GZ
Q
(m3/s) 70.0 50.0 41.3 150.0 176.8 150. 100.
W
(tr.m3) 181.4 129.6 535.1 388.8 916.4 388.8 259.2
71
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
thng Qin(m3/s) Win(tr.m
3) Cng dn.
1 70 -51.8 -51.8
2 50 -103.7 -155.5
3 20 -181.4 -337.0
4 10 -207.4 -544.3
5 15 -194.4 -738.7
6 25 -168.5 -907.2
7 40 -129.6 -1036.8
8 150 155.5 -881.3
9 200 285.1 -596.2
10 250 414.7 -181.4
11 150 155.5 -25.9
12 100 25.9 0.0 72
-
13
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Lu lng n h cha nh sau:
thng 1 2 3 4 5 6
Q(m3/s) 30 40 70 90 150 200
thng 7 8 9 10 11 12
Q(m3/s) 250 310 275 150 100 15
73
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Lu lng TB Q0 =140m3/s. Gi thit h y
t=0 v c dung tch 350 tr.m3.
a. Tnh lu lng cng dn trong ta xin. Tnh lu lng iu tit bi p/p ng ch thng.
b. Gii thch s thay i mc nc trong h.
c. Tnh th tch nc trong h vo cui thng 3 v thng 4.
74
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
d. Mc nc h TB thng 1 v 9 ln lt l 400m v 370m. Mc nc sau NM tng ng l 120m v 118m. Gi thit mt nng (ct nc) l 15% v hiu sut tng NM l =0,85.
Tnh cng sut (MW) pht NM v nng lng nm E (tr.kwh) ca 2 thng ni trn.
75
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
-1400
-1200
-1000
-800
-600
-400
-200
0
200
400
600
0 1 2 3 4 5 6 7 8 9 10 11 12
76
A
B C D
E F G
Z
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
AB BC CD DE EF FG GZ
Q(m3/s) 91.3 150 200 233.3 150 100 15
W(tr.m3) 946.2 388.8 518.4 1814.3 388.8 259.2 38.8
77
HNG DN
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Xt th sau vi: Q0=30m3/s; tg() = -10; t0=2th ;
tung A l 150 tr. m3; T0=12th.
78
W(tr. m3)
T(th)
0
B
A
t0
T0
Z
Dng chy n
Dng chy ra khi h
A0
-
14
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Tnh:
- Lu lng tng ng tia OB.
- Tung B.
- Tng lng nc vo h n thi im t0.
- Th tch nc c trong h thi im t0.
79
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Gii:
- QB=Q0+tg() =30-10 =20m3/s.
- Tung B =(QB-Q0)dt=
-10*2th=-51.84 tr.m3.
- Th tch nc vo h =150+Q0dt=150+30*2th.=
305.52tr.m3.
- Th tch nc trong h: =150-(-51.64) =201.84 tr.m3.
80
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Ly li s liu trn, v ng b tr vi Whi=50tr.m
3. Ngoi ra:
- Tung A0 l 55 tr. m3
- Tung ca B l -50 tr. m3
- Tung C l 100 tr. m3
Tnh lu lng iu tit bi p/p ng ch thng.
81
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Gii:
82
W(tr. m3)
T(th)
0
B
A
C
Z
Dng chy n
A0
tA0=1th
tA=2th
tB=7th
tC=9th
tZ=12th 50(tr. m3)
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Bi tp: Dong chy c lu lng TB l 90m3/s. H y lc t=0 c W=200tr.m3. Lu lng tch lu vo v ra khi h cha trong ta xin theo th v bng gi tr nh sau:
83
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
-1100
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
0 1 2 3 4 5 6 7 8 9 10 11 12
T(mois)
W(m
il.m
3)
84
-
15
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
T 1 2 3 4 5 6
Win -51.8 -155.5 -337.0 -544.3 -738.7 -907.2
Wout -303.7 -407.4 -511.0 -645.8 -780.6 -915.4
T 7 8 9 10 11 12
Win -1036.8 -881.3 -596.2 -181.4 -25.9 0.0
Wout -1050.2 -946.5 -816.9 -537.0 -355.5 -200.0
85
Note: Win: lu lng vo; Wout: lu lng ra
n v: tr.m3
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
Cu hi:
1. Tnh lu lng vo TB thng
2. Tnh lu lng iu tit
3. Xc nh thi im h y, cn.
86
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
thng Qin Win Accu. Qout Wout Accu. Delta
0 0 0 0 -200
1 70 -51.8 -51.8 50 -103.7 -303.7 251.8
2 50 -103.7 -155.5 50 -103.7 -407.4 251.8
3 20 -181.4 -337.0 50 -103.7 -511.0 174.1
4 10 -207.4 -544.3 38 -134.8 -645.8 101.5
5 15 -194.4 -738.7 38 -134.8 -780.6 41.9
6 25 -168.5 -907.2 38 -134.8 -915.4 8.2
7 40 -129.6 -1036.8 38 -134.8 -1050.2 13.4
8 150 155.5 -881.3 130 103.7 -946.5 65.2
9 200 285.1 -596.2 140 129.6 -816.9 220.7
10 250 414.7 -181.4 198 279.9 -537.0 355.5
11 150 155.5 -25.9 160 181.4 -355.5 329.6
12 100 25.9 0.0 150 155.5 -200.0 200.0
Qtb 90 0.00 90 0.00 87
PGS. TS. Nguyn Thng
THY NNG & THY IN
Chng 4: iu tit h cha thy in
88