Distribution of suspended sediments and action of nearshore currents in the Xiangyun Island, Laoting County, Hebei Province
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摘要:研究目的
河北祥云岛沿岸海滩分布有优质天然细沙，是著名的沿海旅游沙岛，对该海域悬浮沉积物浓度和近岸流速开展同步调查研究，对祥云岛及其近海工程的生态环境具有重要意义。
研究方法采用船载走航式声学多普勒流速剖面仪（ADCP）对该海域的流速、流向进行连续剖面测量，同时根据仪器记录的背向散射强度定性讨论该海域悬浮沉积物分布情况。
研究结果调查结果显示：（1）祥云岛海域海流以平行于岸线为主，具有明显的往复性，该海域涨潮流大于落潮流，涨潮流沿向岸方向逐渐减弱，祥云岛西南部局部落潮流存在向岸方向增强的现象；（2）祥云岛海域在平潮向落潮过渡期间，海流转向始于底部海水，且海流转向与潮位变化具有一定的滞后性。（3）背向散射强度数据表明，祥云岛近岸海域存在明显的悬浮沉积物高浓度层，悬沙沉积物浓度沿向岸方向增加；平行于祥云岛岸线方向，悬浮沉积物浓度由东北向西南方向逐渐降低。
结论祥云岛近岸海域在海流作用下，悬浮沉积物沿祥云岛岸线由东北向西南运移，是导致祥云岛岸线在东北段侵蚀、西南段淤积的主要原因之一。
创新点:利用船载走航式ADCP开展流速、流向及悬浮沉积物浓度的同步测量，阐明了祥云岛海域悬浮沉积物分布规律与近岸海流的作用。
Abstract:This paper is the result of marine geological survey engineering.
ObjectiveThere are high−quality natural fine sand distributed along the coast of Xiangyun Island in Hebei, which is a famous coastal tourist island. Simultaneous investigation and research on the concentration of suspended sediments and nearshore current in this area is of great significance to the ecological environment of Xiangyun Island and its nearshore engineering.
MethodsThe current velocity and flow direction of the sea area were continuously profiled by ship−borne Acoustic Doppler Current Profiler (ADCP), and the distribution of suspended sediments in the sea area was qualitatively discussed according to the backscatter intensity recorded by the instrument.
ResultsThe survey results show that: (1) The current in Xiangyun bay is mainly parallel to the coastline, which has obvious reciprocation. The magnitude of flood current was obviously larger than ebb current, the flood current was gradually weakened along the shore direction, however the ebb current in the southwest of Xiangyun bay increased along the shore direction; (2) During the transition from flat tide to ebb tide in Xiangyun island sea area, the current turning starts from the bottom water, and the current turning and tide level change have certain lag; (3) The data of backscatter intensity shows that: there was a high concentration layer in Xiangyun bay coastal area, and the concentration increases along the shore direction, and the concentration of suspended sediment gradually decreases from northeast to southwest.
ConclusionsXiangyun island coastal waters under the action of the tidal current, suspended sediment along Xiangyun Island shoreline from northeast to southwest, is the main reason for the Xiangyun island in the northeast section erosion and the southwest section deposition.
Highlights:The synchronous measurement of current velocity, direction, and suspended sediment concentration was carried out using ship-borne ADCP, elucidating the distribution characteristics of suspended sediment in the Xiangyun Island sea area and the action of nearshore currents.
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1 ❶李勇, 文明征, 杨朋. 2019. 津冀沿海海洋侵蚀淤积调查项目进展报告[R]. 天津: 中国地质调查局天津地质调查中心, 20−25. -
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图 2 测量期间的潮位数据（不同颜色显示相应调查测线的潮位信息）
Figure 2. Tide level data during the survey period (Different colors show the tide level of the corresponding survey line)
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图 3 测线L5不同深度水层航迹（红线所示）和流速矢量图
底跟踪，ADCP通过接接收和处理由河底或海底的回波信号获得船速的方法
Figure 3. Track (red line) and velocity vector graph of different water depths of line L5
Bottom tracking, ADCP is a method of obtaining ship speed by receiving and processing echo signals from the river bottom or seafloor
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图 5 测线L9不同深度水层航迹（红线所示）和流速矢量图
Figure 5. Track (red line) and velocity vector graph of different water depths of line L9
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图 6 测线L9不同等深线处海流流向剖面图
Figure 6. Profile of current direction at different Isobaths of line L9
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