A DECISION MODEL TO PREDICT SEDIMENT YIELD FROM FOREST PRACTICES1
作者:
R. G. Burns,
J. D. Hewlett,
期刊:
JAWRA Journal of the American Water Resources Association
(WILEY Available online 1983)
卷期:
Volume 19,
issue 1
页码: 9-14
ISSN:1093-474X
年代: 1983
DOI:10.1111/j.1752-1688.1983.tb04550.x
出版商: Blackwell Publishing Ltd
关键词: KEY TERMS:;erosion;sediment yield;timber harvesting;site preparation;forest regeneration.
数据来源: WILEY
摘要:
ABSTRACT: In order to choose among “best management practices,” forest managers need to predict sediment yield to perennial streams following various forest land operations. The “universal soil loss equation” (USLE) is not directly applicable to forest operations because of the heterogenous soil surface conditions left by harvesting, site preparation, and planting. A sediment hazard index is proposed, to be based on the amount of exposed mineral soil and its proximity to streams. The model offered includes rainfall erosivity, soil erodibility and average land slope, together with the index W. A paired watershed experiment in the central Georgia Piedmont was used to estimate parameters in the model. The experimental basin (80 acres) was clearcut, drum roller chopped twice, and planted by machine. The standard error of estimate of sediment yield was computed to be about 50/lbs/ac per sampling period (four months). Use of William's erogivity index (storm flow times peak flow) reduced the standard error to 33
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