1、* S E 1 S “ b : 1996-03; l : 1996-05b C i , F + *陈志清( S S S E 9 , 100101)4 1 s F F + , i 5 ) M ) 1 , z # F + Y b T V : P 3 n 1 H q # 1 ? v z , T F % R c , F ? l , 5 ? B P M z 0 , F b1 o M C i , F + m 1 s mFig. 1Distribution of flood plains inmiddle reaches of the Yellow River1 s + C , ! l , ! l b z
2、, C v , v , 5 1 Y , R a , B / 1 $ b # $ , 1 1 | % v l , 1 / “ v l 1 , o Z T # M 11j5 = 9 v1 “ b2 F + l 5 M a # Z ; V 2j4 , F # + Y V “ d , V C i , 4 6 T V , l 3 ( h a a 6 ), 1i , 3 ( a 2 a E 2 1 ) , t (m 2), “ Q “ ) s b T V , F x , c 52. 0%, x c 31. 3%, T c 16. 7%, 0. 068 45 mm (V 2) nullb F : _ s Y
3、 / % + bl % ,C Y x , / ; l v % x aY x 9 s , x 1 1 A 4 , l / F 5 x Y x , / % b 1 / , F 1 l A 1 % , v x x T r F , / x , B B T rC , V F ax T s 1 c A , V _ / M A , 3094 b: C i , F + null “ s S S s i bm 2 F mFig.2Substance composition in relevant profiles of flood plainsin middle reaches of the Yellow Ri
4、ver V 2 F R c s 1 VTab. 2Percentageofcontents of varyingparticles in flood plain substancesatdifferentsectionsatthemiddlereaches of theYellowRiver , ov /km / mmT c ( %)x c ( %) c ( %) h 6l (2391841470. 128 150. 086 440. 065 350. 093 315. 212. 213. 010. 112. 226. 027. 221. 882. 661. 859. 868. 1 2 E 2
5、 1 1 i , (8551250. 066 470. 039 650. 024 640. 043 5913. 922. 733. 523. 339. 140. 742. 540. 847. 036. 624. 035. 9 ( 0. 068 45 16. 7 31. 3 52. 0310 52 c v h , x T c M 9 b L , o v F M 1 T i , + E T r C b E 2 1 B , 2 m P V n S = , c 15. 0%, x c 39. 1%, T c r 45. 9%, 0. 024 64 mmb B 42 cm T r , ( 0. 001
6、70 mmb t T r C i , P F ? v v 9 bV F _ M A , 5 / , V - ,F Y M % b l T , - , c r 74. 7%, x # T c 15. 9%# 9. 4%b7 , c h 48. 9%, x T c 5 s Y 9 36. 0%# 15. 1%b v E 2 1 , F 9 “ Q - Y a % + , ) - F 32. 9%, x 46. 0%, T 21. 1%, 7 F 15. 0%, x T c 5s Y r 39. 1% 5. 9%b F v l : _ _ M H q M M 1 bB , “ q w L % V v
7、 u s M w M aM W L , V “ f A , “ L / 9 B tM ? p , V / G Q : h 0. 040 mm, 0. 034 mm, 6 0. 014 mm, 0. 020 mm, 2 0. 022 mm, E 2 1 0. 011 mm, l C s Y u M , v C w M M b f , h V 0. 04 mm / C , 7 E 2 1 ? l 0. 011 mm C , N V Q v l Y v b “ , B , M w M a M L 9 B “ , , q w L % 0. 009 mm, 0. 016 mmj0. 017 mm, L
8、- 0. 062 mm, Q v l Y 9 v b3 5 ) 1 1 5 ) , C _ “ d , C _ 1958 M j1984 M 17 M 223 Q , V A , 5 1 F , c 5 9 95. 8%, 4. 2% 1 x , + c T , 0. 230mm, ( 0. 261 mm, “ ) A 1 1 F Y b ( R K Y l , ( 5 B , F 5 % , M 1 x B T i b F c x T c 5 1 v by N , 5 M M F V ) A 9 A u Y b3114 b: C i , F + 4 F M F ) 1 V C i , # _
9、 M R ) A (V 3), C _ K Y , 0. 045 mm, c M 9 45. 2%, 1 c h 37. 5%, 7x T c 5 M 4 , l F M 1 , l F ( c 68. 1%, x T ( 21. 8% 10. 1%, 0. 093 mmb9 , l 1 C Y R s , y N , V l M C M h l b 1 , , B s C , 1 l A M % , 1 / 35. 9%, x T 1 M v 4 , h 0. 044mmb7 , _ M C 1 1 1 i , C R % , 1 i , 1 1 Y R s , P M C R B h l
10、bV 3 M C ) R c VTab. 3Particlecontentsof differentgradations in suspended sediments fromrelevantstationsatthemiddlereaches of theYellowRiver_ d 9 M s M T c ( %)x c ( %) c ( %) / mm ( / mmC 1961j1979 19 14. 5 40. 3 45. 2 0. 045 0. 062 1 1961j1979 19 16. 2 46. 2 37. 5 0. 038 0. 045 , 1961j1979 19 20.
11、3 46. 1 33. 6 0. 035 0. 041 1961j1979 19 20. 4 49. 7 29. 9 0. 031 0. 037 E 1961j1979 19 19. 2 59. 1 21. 7 0. 027 0. 037h 1963j1979 17 19. 8 54. 1 35. 1 0. 040 0. 0435 z # F + Y B H , z N # F F ? v l Y + # v l b z v , , z 0 , 9 ; Q , T . N , s , l b “ , T F % R c , F ? , 9 a b 6 V ( 67a56a49a34a26a17
12、) z 1 (B1/ 2/H) M z # F x T c s 1 W 1“ , m 3am 4bn 5 , z 1 z W i z L 1 “ , z , z 1 v , 9 b6 6 49 z K v , r 14. 0km, z 1 9 K v , M ( r 37. 71bl z 9 v , z312 52 1 , 7 1 i , z M N , z 1 9 l b z 1 z W M 1 “ r 0. 99bm 3 1 z 1 z 1 “ mFig.3Relationship of width-depth ratio of rele-vant cross-section with f
13、lood plain width in mid-del reaches of the Yellow Riverm 4 1 z 1 x T c 1 “ mFig. 4Relationship of width-depth ratio of rele-vant cross-section with silt and clay content inmiddle reaches of the Yelow River z 1 F W 1 “ , f 1 b9 , F x aT c , z 1 l , M 1 , M 1 f z z 1 W 1 “ z , 7 O C f b 49 l / f + y b
14、 C , ! l X v Y R l , y N , l / H , z , z 0 , z 1 v , C v , Y R s M , x T B 1 bN , l / z 1 5 g , 1 C l , z 1 km P , 5 g b5 g , z F v , h bF ( ) 1 , P 1 C l , t % R , V 7 / l / z v a z 1 9 v , F M % , y 7 m 9 C f b1 “ 49 + y f , 5 B s V , z 1 x T c s 1 W M 1 “ r - 0. 95, z M 1 , z 1 T c s 1 W M 1 “ 9
15、r - 0. 80b z 1 T y M , z # F x T c s 1 sY T 2 1 M B 9 / T :C1 = 1. 67C2 - 0. 138C3 + 9. 46 (5-1)T C1 z 1 , C2 z (km) , C3 F x T c s 1 , B “ Z 0. 991 6b T V , z # F x T c + A Y b N A , P 3 n 1 H q # 1 ? v z , T F x T c , F ? l , 5 ? B P M z 0 , F b , T F 5 B x aT c , 1 V , , H 1 z T , V ? z 0 a b3134
16、 b: C i , F + 8 , F Q H q # C ? p , V 7 V , o , K v K ? o r m 4 S G bv r g , , X j bA F # s H q , z y R , ? a l bN , “ y l o , ? , | y B “ v w g , C o z , l B E s X b z , # y , T C o , o/ 9 L b , l | B v o T by N , C i , s # F , V ) H H q , B il , 7 O 3 L l 9 1 il b I D1 S S / i. S v / 1 . S , 1958.
17、 12.2= , V , W . M ? p . 6 2 S / , 1994.3 6 6 . l 2 M % s . , 1988( 3) .4 . l Z . , 1988( 3) .T e b, 3 , 1940 M 7 3 , , 1965 M 2 v “ 8 , 1969 M S S 3 8 , 1985-09j1988-03 1 H v ix T T bB V Y T , X S = ? V 30 b314 52 GRAINSIZECHARACTERISTICSOFFLOODPLAINSUBSTANCECOMPOSITIONALONGLONGMEN-SANMENXIASECTION
18、OFTHEYELLOWRIVERChen Zhiqing(Institute of Geography, Chinese A cademy of Sciences and the State PlanningCommission of P.R. China, Beijing100101)Key wordsYellow River, Longmen-Sanmenxia, flood plain substance, grain-sizecharacteristicsAbstractThis paper analyzes grain size characteristics based on sa
19、mples of flood plain substancecomposition collected systematically from Longmen-Sanmenxia section of the Yellow River. Interms of spatial changes, the longitudinal distribution of alongshore flood plain substances ischaracterized by coarseness at upstreams and fineness at downstreams. In terms of horizontalchanges, grain size of flood plain substances changes from coarse at forward fringe to fine atbackward fringe. Comparisons of grain-size graduation of flood plain substances with that of riv-er bed substances indicated that substances of flood
