ÿ¶Î³¤100m£¬Èý¶ÎµÄ¹Ü¾¶·Ö±ðΪDN2000mm£¬1600mm£¬1200mm£¬Èý¶Î¹²Éè45¸öÅųö¿×£¬¿×¾¶175mm£¬¿×¾à6.5mm£¬ÔÚÆ½¾ùË®ÉîµÄ1/3´¦ÅçÈë½ÖС£À©É¢Æ÷µÄÄ©¶Ë¾à°¶±ß1000m¡£
ÓÉʽ£¨2-14£©µÃ
u*?ghi?9.8?20?6.7?10?6?0.0362m/s
ʽ£¨2-16£©µÃ
?z?0.067hu*?0.067?20?0.0362?0.0485m2/s
ʽ£¨2-17£©µÃ
202Tz?0.4?0.4??3300s
?z0.0485ʽ£¨2-18£©µÃ
h2Lz?uTz?0.16?3300?528m
¸ù¾ÝÏÖ³¡Ê¾×ٲⶨ£¬´ó½ÔÚ¸ÃÊкÓÁ÷¶ÎµÄ?y?0.5£¬¹ÊÓÃʽ£¨2-13£©
Dy??yhu*?0.5?20?0.0362?0.362m2/s
ÿ¸öÅŷſ׵ÄÅÅ·ÅÔ´Ç¿¶ÈΪ£º
m?M5.4?280??33.6g/s n45¸ù¾ÝÌâÒâÒªÇó£¬ÓÃʽ(2-11)~ʽ(2-24)¼ÆËã³öÑØºÓÁ÷·½Ïò2km¡¢4km¼°¼¯ÖÐȡˮ¿Ú 8km ´¦µÄBOD5Ũ¶ÈÖµ¡£¼ÆËãÖµÁÐÓÚ±í2-2¡£
ÅÅ·ÅÀ©É¢Æ÷ÏÂÓξàÀëx(km) ¶þάˮÌåË®ÖÊÃþÐÍÓ¦ÓüÆËãÖÔ
2 4 8 ±í2-2
Á÷´ïʱ¼äTx(s) À©É¢¿í¶ÈÔöÀïLy(m) ºáÏò¾ù·½²î?y 212500 380 9050 95 0.044 25000 538 18100 135 0.031 50000 760 36200 190 0.022 ?y ?(mg/L) 9
Ũ¶ÈÔöÁ¿?C(mg/L) 1.41 3.71 1.16 3.46 0.90 3.2 0.7 3.0 0.04 2.3 + 0.04=2.34 ×î´óŨ¶ÈÖµCmax(mgŨ¶ÈÔöÁ¿?C1(mg/L) /L) C1(mg/L) ?C2(mg/L) ȡˮ¿Ú´¦Å¨¶ÈC2(mg/L) ¼ÆËã½á¹û±íÃ÷£¬È¡Ë®¿Ú´¦ÓÚÎÛÈ¾ÔÆµÄ±ßÔµ£¬Òò½Ë®»ùÖµBOD5Ϊ2.30mg/L£¬ÓÉÓÚÎÛË®µÄÅÅÈëÑØ½Ë®À©É¢ÖÁ¸Ã´¦£¬BOD5Ũ¶ÈµÄÔöÁ¿Îª0.04mg/L£¬¹Ê¸Ã´¦µÄ½Ë®BOD5 =2.3 + 0.04 = 2.34mg/L£¬ÈÔÊôÓÚ¶þ¼¶Ë®Ìå(BOD5<3mg/L)£¬ÈÏΪÊǰ²È«µÄ¡£
£¨¶þ£©ÎÛË®Åź£µÄÀ©É¢Ï¡Êͼ°Ó¦ÓÃ
ÓÉÓÚº£Ë®µÄÐÔÖÊÓ뽺Ӳ»Í¬£¬º£Ë®µÄº¬ÑÎÁ¿ó{£¬Ãܶȴó£¬Ë®²ãÉÏÏÂβî´ó£¬Óг±Ï«ÓëÑóÁ÷µÄ»Øµ´¡£Òò´ËÎÛË®ÅÅÈ˺£Íåºó£¬À©É¢Ï¡ÊÍ´æÔÚ×ųõʼÖáÏßÏ¡ÊÍ¡¢ÊäÒÆÀ©É¢Ï¡ÊÍÓë´ó³¦¾úȺµÄË¥ÍöÏ¡Ê͵ȡ£
³õʼÖáÏßÏ¡ÊÍ¿ÉÓóõʼÖáÏßÏ¡ÊͶȱíʾ¡£
£¨1£©µ±º£Ë®ÃܶȾùÔÈʱ£¬ÎÛË®Åç³öºó£¬Óð×´Á÷¿ÉÒ»Ö±¸¡ÉýÖÁº£Ã棺
?2Scq?S1?Sc?1???? £¨2-26£© uh???1
Sc?0.38?g'?hq £¨2-27£©
ͼ2-6 ³õʼÖáÏßÏ¡ÊÍ
13?23ʽÖÐ S1¡ª¡ª ³õʼÖáÏßÏ¡ÊͶȣ»
Sc¡ª¡ª ÎÞË®Á÷ʱ£¬¼´u=0ʱµÄ³õʼÖáÏßÏ¡ÊͶȣ»
g'¡ª¡ª Óɸɺ£Ë®ÓëÎÛË®ÃܶȲîÒýÆðµÄÖØÁ¦¼ÓËٶȲîÖµ£¬g'??a??0g£» ?a
?a¡ª¡ª º£Ë®Ãܶȣ» ?0¡ª¡ª ÎÛË®Ãܶȣ»
2
g¡ª¡ª ÖØÁ¦¼ÓËÙ¶È£¬9.81m/s£»
10
h¡ª¡ª ÎÛË®ÅÅ·ÅÉî¶È£¬m£»
3/£¨s?m£©¡ª¡ª À©É¢Æ÷µ¥Î»³¤¶ÈµÄÅÅ·ÅÁ¿£¬m£» q
u¡ª¡ª º£Ë®Á÷ËÙ£¬m/s¡£
£¨2£©º£Ë®ÃܶÈËæÉî¶È³ÊÏßÐÔ·Ö²¼Ê±£¬¼´º£Ë®ÃܶÈ×Ôº£ÃæÏòº£µ×³ÊÏßÐÔÖð½¥Ôö¼Ó£¬ÎÛË®ÅçÈ뺣ˮºó£¬Óð×´Á÷ÉÏÉýÖÁÒ»¶¨¸ß¶Èzmaxºó£¬Í£Ö¹ÉÏÉý£¬´ËʱÎÛÈ¾ÔÆµÄÃÜ¶È±ÈÆäÉÏÃæµÄº£Ë®µÄÃܶȴó¡£Ôò
?2Scq? S1?Sc?1????uzmax???1 £¨2-28£©
Sc?0.31?g'?zmaxq
13?23£¨2-29£©
ʽÖÐ zmax ¡ª¡ªÎÛÈ¾ÔÆµÄ×î´ó¸¡Éýó{¶È£¬m¡£
zmax???0?6.25(g'q)??g???????
a0??23 £¨2-30£©
2.ÓÉÓÚÑóÁ÷ÒýÆðµÄÊäÒÆÀ©É¢
º£ÑóµÄÁ÷̬½Ï¸´ÔÓ£¬³ýÖ÷µ¼ÑóÁ÷Í⣬»¹Óг±Ï«µÄÓ°Ïì¡£¶Ô¸Éº£Óò¡¢»ò¿íÀ«µÄº£Íå,¿É²»¿¼Âdz±Ï«µÄ»Øµ´×÷Ó㬷ñÔò¾ÍÓ¦¿¼Âǻص´¶ÔÏ¡ÊÍÀ©É¢µÄÓ°Ïì¡£´ËÍ⣬ÎÛË®ÖÐÓлúÎÛȾÎïÔÚº£Ë®ÖеÄÉúÎﻯѧ½µ½â×÷ÓÃԶСÓÚÑóÁ÷ÒýÆðµÄÊäÒÆÀ©É¢Ï¡ÊÍ×÷Óá£Òò´ËÉú»¯½µ½â×÷ÓÿÉÂÔÈ¥²»¼Æ¡£ÓÖÒòΪ¾³õʼÖáÏßÏ¡Êͺ󣬿ÉÊÓÉî¶È·½ÏòµÄŨ¶ÈÊǾùÔȵ쬹ÊÒ²¿ÉÓöþάˮÖÊÀ©É¢Ä£ÐͼÆËã¡£
£¨1£©²»¿¼Âǻص´µÄÓ°Ïì
¸ù¾Ýʽ(2-10)£¬¼ÙÉèÎÛÈ¾ÔÆËæÑóÁ÷µÄÒÆ¶¯Êǵ¥ÏòµÄ¡¢Á¬ÐøµÄºÍ¾ùËٵģ¬ÎÛË®µÄºáÏòÀ©É¢»ìºÏ¿ÉÓþßÓÐˮƽÀ©É¢ÏµÊýµÄÀ©É¢¹ý³ÌÀ´ÃèÊö£¬ÔòBrooksÇó½âʽΪ£º
S2?
erf13/2?2x??1????1?3L?3 £¨2-31£©
ʽÖÐ S2¡ª¡ª ÊäÒÆÀ©É¢Ï¡ÊͶȣ»
erf???¡ª¡ª Îó²îº¯Êý£¬erf????2???0e??d?£»
2 x¡ª¡ª ÅÅÎÛ¿ÚÖÁÏÂÓÎijµãµÄˮƽ¾àÀ룬m£»
11
12E0¡ª¡ª ϵÊý£¬£» ??? ugL
E0¡ª¡ª ÅÅÎÛ¿Ú´¦£¨x= 0£©µÄÎÐÁ÷À©É¢ÏµÊý£¬m23s?44/3£¬E0?4.64?10gL£»
L¡ª¡ª À©É¢Æ÷³¤¶È£¬m¡£ £¨2£©¿¼Âǻص´µÄÓ°Ïì
¶ÔÓÚ²»Ì«¿íµÄ³±Ï«º£¿Ú£¬ÎÛË®ÔÚÒ»¶ÎÊÜÄɺ£Ë®ÄÚ£¬¾¹ý¼¸´Î»Øµ´ºó²ÅÄÜÒÆ¿ªÅÅÎÛ¿ÚÏòÍ⺣·½ÏòÊäÒÆ£¬´ËʱµÄS2Ϊ£º
?uE?L?Ly?hCp?2nQC0?S2?C1??
??uE?L?Ly?h?2nQ???1 £¨2-33£©
ʽÖÐ C1¡ª¡ª ¾³õʼϡÊͺó£¬ÎÛÈ¾ÔÆÖáÏßÉϵÄŨ¶È£¬mg/L£»
C0¡ª¡ª ÔÎÛË®¿ÚÎÛȾÎïµÄŨ¶È£¬mg/L£»
3/s£» ¡ª¡ª ÅŷŵÄÎÛË®Á¿£¬mQ
Cp¡ª¡ª º£Ë®ÖÐÎÛȾÎïµÄŨ¶È£¬mg/L£»
uE¡ª¡ª Õdz±Á÷ËÙ£¬m/s£»
n ¡ª¡ª ÎÛȾÎïÔÚ³±Ï«×÷ÓÃϵĻص´´ÎÊý¡£
uEitEi?ut?uEitEi n?i?1FiFiKK£¨2-34£©
ʽÖÐ tEi¡ª¡ª µÚi¸ö³±ÖܵÄÕdz±Àúʱ£¬s£»
tFi¡ª¡ª µÚi¸ö³±ÖܵÄÂä³±Àúʱ£¬s£»
uEi£¬uFi¡ª¡ª ·Ö±ðΪµÚi¸ö³±ÖܵÄÕÇ¡¢Âä³±Á÷ËÙ£¬m/s£»
K¡ª¡ª ¹Û²âµÄ³±ÖÜÆÚÊý¡£ ÎÛÈ¾ÔÆ¾¼¸´Î»Øµ´ºóµÄºáÏòÔö¿í£º
Ly?42nTDy
£¨2-35£©
ʽÖÐ T¡ª¡ª ÕÇÂä³±Àúʱ£¬T?tÕÇ?tÂ䣻
12
Dy¡ª¡ª ºáÏòÀ©É¢ÏµÊý£¬m2/s¡£