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《Journal of Beijing Forestry University》 1994-S4
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An Analysis on the Effect of Two KindS of Arbored Litter to the Roughnes Coefficient Experimented in the Laboratory

Zhang Hongjiang (College of Soil and Water Conservation,BFU)Kitahara Hikaru (The Short-time Specialist of JICA,Forestry and Forest Products Research Institute of Japan,Ibaragi Prof.305)  
In the laboratory,the effect of two kinds of arbored litter to the value of roughness coefficient in the Manning Formula were studied.The formulas of power relating between the value of roughness coefficient and the amount of the litter have been gotten.The result shows that the more litter,the higher value is,and at the same coditions the effect of Robinia pseudoacacia Linn.litter to the roughness coefficient is bigger than that of Pinus tab- ulaeformis Carr.litter.The roughness coefficient value(n)of Robinia pseudoacacia Linn.litter.is 0.1784 and the roughness coefficient value(n)of Pinus tabulaeformis Carr.litter is 0.1297.while the amount of the litter is 0.200g/cm~2.The results also show that a limitation of increasing the roughness coefficient value exists by increasing the litter amount.The top limitation of the litter amount is about 0.250g/cm~2~0.300g/cm~2(equal 25t/hm~2~30t/hm~2)while the unit width flow(a)is about 94ml/m·s.
【CateGory Index】: S714
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