Sediment flux and sediment-induced stratification in the Changjiang Estuary
學年 106
學期 1
出版（發表）日期 2017-08-30
作品名稱 Sediment flux and sediment-induced stratification in the Changjiang Estuary
作品名稱（其他語言）
著者 Arash Niroomandi; Gangfeng Ma; Shih-Feng Su; Fengfeng Gu; Dingman Qi
單位
出版者
著錄名稱、卷期、頁數 Journal of Marine Science and Technology 23, p.349–363
摘要 Sediment deposition in the north passage of the Changjiang Estuary, where the Deep-water Navigation Channel (DNC) is located, has been a major concern in the past decades. To understand the suspended sediment dynamics and the effects of sediment-induced stratification on sediment flux in the navigational channel, field data on tidal flow and suspended sediment concentration (SSC) are collected and analyzed in this study. It is shown that net sediment transport is dominated by ebb currents in the study area. The net sediment flux is generally toward the ocean and the maximum value is found to be in the middle reach of the passage. In the lower reach of the passage, the net sediment flux is landward in the lower layer and seaward in the upper layer of the water column due to the two-layer feature of the estuarine circulation. Advective flux plays a significant role in transport of sediment in upper and middle reaches of the passage by carrying 70–100% of the suspended sediment. However, this amount is reduced to 30–60% in lower reach of the passage, where tidal effects become more important. The suspended sediment-induced stratification in the north passage is examined by calculating eddy viscosity. It is found that suspended sediment can reduce eddy viscosity by 10–30%. The highest depth-averaged SSC is located in the middle reach of the north passage, where the averaged SSC is 4–15 times higher than that in the upper reach. In this region, bed shear stress is larger at ebb, while SSC is higher at flood. It is inferred that suspended sediments in the DNC during flood are partially transported from a neighboring shoal, which plays an important role in sediment dynamics in the north passage.
關鍵字 Changjiang Estuary;Deep-water navigational channel;Suspended sediment dynamics;Sediment-induced stratification
語言 en_US
ISSN 1437-8213
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 JPN
公開徵稿
出版型式 ,電子版
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