ch4_dieu tiet ho.ppt

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: nguyenthong@hcmut.edu.vn or nthong56@yahoo.fr

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

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