期刊
WATER RESOURCES RESEARCH
卷 39, 期 3, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2001WR000794
关键词
sediment tracing; harvested areas; unsealed roads; geochemistry; fallout radionuclides; mixing model
[1] Knowledge is scarce regarding the relative contributions from harvested areas and unsealed roads to sediments in forested catchments. We investigate the source composition of suspended sediment using sediment tracers and an improved multivariate mixing model. Sediment samples were collected during six rainfall events. Geochemical and radiometric tracer properties were corrected for particle size and organic content as well as conservativeness during erosion and sediment delivery. The mixing model incorporates variability of the tracer properties, using a Monte Carlo simulation technique. Mean sediment contribution from the undisturbed forest was 50-70%; harvested areas, gravel-surfaced roads, and ungravelled roads contributed 5-15%, 6-14%, and 12-25%, respectively. The unsealed roads contribute 20 to 60 times more sediment than the undisturbed forest and about 10 times more sediment than the harvested areas on a per unit area basis. Harvested areas contribute 1 to 5 times greater sediment than the undisturbed forest. These results support other studies that identify unsealed roads as important sediment sources in forested catchments.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据