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Field Investigations of Underwater Mounds Formed by Hopper Dredge Discharges in a Coastal Environment
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2020-05-30 , DOI: 10.3390/jmse8060395
Wenhong Dai , Wei Ding , Chuanteng Lu , Xiaofeng Luo , Qiancheng Xie

In a coastal environment, this paper investigated the formation process and the cumulative shape of subaqueous mounds formed by hopper dredged discharges. Hydrological observations and field tests were performed to examine the flow features and ultimately generated morphology characteristics. A high-precision digital elevation model (DEM) was established by multi-beam depth sweeping (MBDS) in the experiment. Particular attention was paid to the formation of the mounds, the three-dimensional shape and the influence factors. The field measurements showed that the mounds were roughly symmetrical in space, and the tidal current, though of weak strength, played a certain role in shaping the profiles. Cone and volcanic cone mound tops were observed, featuring the main top shapes. The height and covered area of the mounds were proportional to the amount of dumped sediment, and they were also affected a lot by the water depth. The results of superimposed tests showed that the second placement over the existing mound resulted in a similar overall shape, but there was pronounced movement around the mound; additional discharged volumes at the same location mainly increased the mound height. The field tests provided a reference for understanding the sediment dumping in other similar coastal areas.

中文翻译:

沿岸环境中料斗挖泥机排放物形成的水下土丘的野外调查

在沿海环境中,本文研究了由料斗疏discharge排放物形成的水下丘的形成过程和累积形状。进行了水文观测和现场测试,以检查水流特征和最终产生的形态特征。通过多波束深度扫描(MBDS)建立了高精度数字高程模型(DEM)。特别注意了土丘的形成,三维形状和影响因素。现场测量表明,土丘在空间上大致对称,潮流虽然强度较弱,但在塑造轮廓方面起了一定作用。观察到圆锥形和火山圆锥形丘顶,具有主要的顶部形状。土墩的高度和覆盖面积与倾倒的泥沙量成正比,并且它们的水深也对其影响很大。叠加测试的结果表明,在现有土墩上进行第二次放置会产生相似的总体形状,但是土墩周围有明显的运动;在同一位置增加的排泄量主要增加了堆高。现场试验为了解其他类似沿海地区的泥沙排放提供了参考。
更新日期:2020-05-30
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