FIELD INVESTIGATIONS OF SUSPENDED SEDIMENT TRANSPORT IN THE NEARSHORE ZONE
FIELD INVESTIGATIONS OF SUSPENDED SEDIMENT TRANSPORT IN THE NEARSHORE ZONE
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DOI：
10.9753/icce.v19
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发表时间：
1984-01
期刊：
影响因子：
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通讯作者：
R. Sternberg;N. C. Shi;John P. Downing
中科院分区：
文献类型：
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作者：
R. Sternberg;N. C. Shi;John P. Downing
利用一系列可测量高达180 gm/£、频率响应为10 Hz的微型光学后座传感器，研究了加州圣巴巴拉Leadbetter海滩悬浮泥沙分布和海岸泥沙输运特征。在1980年2月7日至25日期间，在冲浪区的四个位置安装了垂直传感器阵列，并与压力传感器和流速计同时操作。每天收集2-4小时的数据。通过对数据的分析，揭示了不同波浪条件下悬沙浓度分布、平均悬沙负荷和海岸颗粒通量。结果表明，泥沙输移是与入射波浪运动和次重力运动振荡有关的单个悬浮事件；悬沙浓度在远离海床的地方呈近似对数递减；滨岸输运率的最大值出现在中浪带；实测的悬沙滨岸输运率与现有输运方程预测的总滨岸输运率相等。
The suspended sediment distribution and longshore sediment transport characteristics at Leadbetter Beach, Santa Barbara, California were investigated using a series of miniature optical backseatter sensors which can measure particle concentrations as high as 180 gm/£ and have 10 Hz frequency response. Vertical arrays of sensors were maintained at up to four positions across the surf zone during 7-25 February 1980 and were operated concurrently with pressure sensors and current meters. Data were collected on a daily basis over 2-4 hour periods. The data were analyzed to reveal concentration profiles of suspended sediment, the average suspended sediment loads, and the longshore particle flux in relation to varying wave conditions. Results show that sediment transport occurs as individual suspension events related to incident wave motions and infragravity motion oscillations within the surf zone; suspended sediment concentration decreases approximately logarithimically away from the seabed; the maximum values of longshore transport rates occur in the mid-surf zone; and the measured suspended sediment longshore transport rate is equal to the total longshore transport rate as predicted by existing transport equations.