Suspended sediment transport and deposition over a dune: Río Paraná, Argentina
Suspended sediment transport and deposition over a dune: Río Paraná, Argentina
复制标题
沙丘上的悬浮沉积物输送和沉积：阿根廷巴拉那河
DOI：
10.1002/esp.1847
复制
发表时间：
2009
影响因子：
3.3
通讯作者：
O. Orfeo
中科院分区：
文献类型：
--
作者：
R. Kostaschuk;D. Shugar;J. Best;D. Parsons;S. Lane;R. Hardy;O. Orfeo
阿根廷巴拉那河的实地数据被用来研究沙丘上悬浮泥沙输运的模式。三维流速的测量是用声学多普勒流速剖面仪进行的，而悬浮泥沙的浓度和粒径是用激光原位沉积物散射透射仪进行量化的。悬浮泥沙浓度和流向和垂直泥沙通量最高接近床，与向上的垂直通量在风侧的沙丘和向下通量的背风侧。悬移质泥沙浓度在坡顶处高于波谷处，悬移质泥沙在近床处粗化。约有17%的悬移质在到达波谷之前沉积在背风面。大多数沉积砂是较粗的沉积物，起源于靠近顶部的河床，这一结果与基于Mohrig和Smith（Water Resources Research 1996; 32：3207-3217）模型的模拟结果一致，模拟了沙丘背风侧分散的沉积物的漂移长度。版权所有© 2009约翰威利父子有限公司。
Field data from the Rio Paraná, Argentina, are used to examine patterns of suspended sediment transport over a sand dune. Measurements of three‐dimensional velocity are made with an acoustic Doppler current profiler whilst suspended sediment concentration and particle size have been quantified using a laser in situ sediment scattering transmissometer. Suspended sediment concentration and streamwise and vertical sediment flux are highest close to the bed, with an upward vertical flux over the stoss side of the dune and downward flux over the lee side. Suspended sediment concentrations are higher over the crest compared with the trough and suspended sediment is coarsest near the bed. About 17% of the suspended‐load transported over the crest is deposited in the lee side before it reaches the trough. Most of this deposited sand is coarser sediment that originates close to the bed over the crest, a result consistent with simulations based on the model of Mohrig and Smith (Water Resources Research 1996; 32: 3207–3217) for the excursion lengths of sediment dispersed in the lee side of a dune. Copyright © 2009 John Wiley & Sons, Ltd.