Empirical predictors of annual bed load travel distance, and implications for salmonid habitat restoration and protection
Empirical predictors of annual bed load travel distance, and implications for salmonid habitat restoration and protection
复制标题
DOI：
10.1002/esp.251.abs
复制
发表时间：
2001-08-01
影响因子：
3.3
通讯作者：
Beechie, TJ
中科院分区：
文献类型：
--
作者：
Beechie, TJ
在阿拉斯加、美国山间、美国西海岸和苏格兰的16个地点测量的推移质沉积物的年移动距离（L-b）与平滩河道宽度有很强的相关性（r（2）= 0.86，p < 0.001）。颗粒的行进距离可能受到捕获在棒中的限制，棒具有与通道宽度成比例的纵向间距。增加丰富的木质残体减少酒吧间距，并可能减少L-b。推移质输沙量年累计历时越长，L-b值越大。其他预测年行程距离的因子，如单位长度水流功率、流域面积和平滩流量与L-b的相关性较差（r（2）在0.27 ~ 0.51之间）。单位床面水流功率、基底切应力和坡度与L-b的相关性不显著（r（2）< 0.05）。当回归仅限于美国西海岸的数据时，大多数相关性得到了改善。可利用移动距离估计值来帮助确定可能需要更长时间才能从沉积物供应的短期大幅增加中恢复的河段。出版社：John Wiley & Sons，Ltd.
Measurements of annual travel distance (L-b) of bed load sediment at 16 locations in Alaska, the intermountain USA, west coast USA and Scotland are strongly correlated with bankfull channel width (r(2) = 0.86, p < 0.001). Travel distance of particles is probably limited by trapping in bars, which have a longitudinal spacing proportional to channel width. Increased abundance of woody debris reduces bar spacing and may reduce L-b. Longer cumulative duration of bed load transporting flows in a year appears to increase L-b. Other predictors of annual travel distance such as stream power per unit length, drainage area and bankfull discharge were less well correlated with L-b (r(2) ranging from 0.27 to 0.51). Stream power per unit bed area, basal shear stress and slope were not significantly related to L-b (r(2) < 0.05). Most correlations were improved when regressions were limited to data from the west coast USA. Travel distance estimates can be used to help identify reaches that may take longer to recover from large, short-term increases in sediment supply. Published in 2001 by John Wiley & Sons, Ltd.