人工集水面降雨径流观测实验研究.pdfVIP

15 1 Vol. 15 No . 1 2001 3 Journal of Soil and Wat er Conservation Mar . , 2001 李小雁, 龚家栋 ( , 730000) : : ( ) , , 7. % 35. 5% , , , 50% 80% , , , , , , : ; ; : 157. 1: : 1009-22 2(2001) 01-0001-0 S A - - Rainf all runof f Characteristics of Artif icial Micro catchments f or Rainwater Harvesti ng - , - LI Xiao yan GONG Jia dong ( Cold and A r id R eg ions E nv ir onmental and E ng ineer ing R es earch I nst itute , Ch ines e A cademy of Sc iences, L anz hou 730000) : ( Abstract T he results of the field experiments indicated that runoff from earth catchments undisturbed loess slope, clearing loess slope and compacted catchments) occurred as infiltration-excess process, and it w as mainly depended upon rainfall intensity. Annual runoff mainly produced from a few high-intensity rainfall events and the annual runoff efficiency ranged from 7. % to 35. 5% , therefore more w ater w ould be, collected from earth catchments by the increase of natural catchment area T he rainfall amount and intensity. had little effect on the w ater yield from asphalt felt, asphalt spraying and concrete treated catchments w ith a mean annual runoff efficiency of 50% 80% and a high cost. T he trend of high efficient use of harvested w ater for such catchments is to combine the w ater harvesting system w ith installation agriculture. The plastic catchment had low