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首页> 美国卫生研究院文献>Scientific Reports >Impact of human activities on subaqueous topographic change in Lingding Bay of the Pearl River estuary China during 1955–2013
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Impact of human activities on subaqueous topographic change in Lingding Bay of the Pearl River estuary China during 1955–2013

机译：1955-2013年间人类活动对珠江口伶ding湾水下水下地形变化的影响

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摘要

Estuaries have been sites of intensive human activities during the past century. Tracing the evolution of subaqueous topography in estuaries on a decadal timescale enables us to understand the effects of human activities on estuaries. Bathymetric data from 1955 to 2010 show that land reclamation decreased the subaqueous area of Lingding Bay, in the Pearl River estuary, by ~170 km2 and decreased its water volume by 615 × 106 m3, representing a net decrease of 11.2 × 106 m3 per year and indicating the deposition of approximately 14.5 Mt/yr of sediment in Lingding Bay during that period. Whereas Lingding Bay was mainly governed by natural processes with slight net deposition before 1980, subsequent dredging and large port engineering projects changed the subaqueous topography of the bay by shallowing its shoals and deepening its troughs. Between 2012 and 2013, continuous dredging and a surge of sand excavation resulted in local changes in water depth of ± 5 m/yr, far exceeding the magnitude of natural topographic evolution in Lingding Bay. Reclamation, dredging, and navigation-channel projects removed 8.4 Mt/yr of sediment from Lingding Bay, representing 29% of the sediment input to the bay, and these activities have increased recently.
机译：在过去的一个世纪中，河口一直是人类密集活动的场所。在十年时间尺度上追踪河口水下地形的演变，使我们能够了解人类活动对河口的影响。 1955年至2010年的测深数据表明，开垦土地使珠江口的伶ding湾海底面积减少了约170 km 2 ，使水量减少了615×10 6 < / sup> m 3 ，表示每年净减少11.2×10 6 m 3 ，表明每年沉积约14.5 Mt期间伶Ling湾的沉积物数量伶ding湾在1980年前主要由自然过程控制，只有少量的净沉积，随后的疏and和大型港口工程项目通过浅化浅滩和加深其槽，改变了该湾的水下地形。在2012年至2013年之间，持续的疏and和开挖沙土导致局部水深变化达到±5 m / yr，远远超过了伶ding湾的自然地形演变幅度。填海，疏ging和航道工程清除了伶ding湾每年8.4 Mt的沉积物，占该海湾输沙量的29％，这些活动最近有所增加。

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