人工模拟降雨条件下紫色土陡坡地侵蚀泥沙变化特征研究_高敏.pdfVIP

25 2 Vo l. 25 No . 2 20 11 4 J our nal of Soil and W ater Conserv ation A pr. , 20 11 高敏, 牛青霞, 王 茹, 陈晓燕, 魏朝富 / , 4007 16) : 25b0 . 2 85 , 0 . 978, 1. 737 mm/ min 3 : , , , 0. 285, 0. 97 8, 1. 7 37 mm/ min , , , , , : ; ; ; : S 157. 1 : A : 1009- 2242 2011) 02- 00 19- 05 Study on Variation Characteristics of Eroded Sediment i n Purple Soil Steep Slope Land Based on Simulated Rainf all GA O M in , N IU Q ing-x ia, WA N G Ru, CH EN X iao-yan , WEI Chao-fu ( College of Resources and Env ironment, S outhw est University/ K ey L aboratory of Eco-environments in hree Gorges Region (M inistry of Education) , S outhw est University , Beibei, Chongqing 4007 16 ) Abstract : T he response charact erist ic of eroded sediment in 25b r unof f plot s w as studied based on t hr ee dif fer- ent sim ulat ed rainfall int ensit y w hich w ere 0 . 285 mm/ min, 0. 97 8 mm / min and 1. 737 mm / min , respect ively. T he result s w ere as f ollow s : T he quant ity of runof f sediment increased f irst ly and t hen reduced gradually and tended t o be st able f inally w it h the runof f duration ext ended during rainf all process. T he t ime of peak quanti- t y o f eroded sedim ent occurred brought f orw ard const ant ly alo ng w ith t he incr ease of rainf all intensit y during runof f generat io n process. A ccum ulat ive sedim ent- runoff of slope runof f sho w ed a relat ionship of pow er funct ion w ith the increase of r unof f duration . A ccum ulat ive sedim ent runoff w it h large rainfal