TOPOGRAPHIC CHANGE OF LAOLONGGOU DEEP TROUGH IN THE MIDDLE STAGE OF CAOFEIDIAN RECLAMATION PROJECT FOR BLOCKING THE SHOAL TIDAL CHANNEL
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摘要: 据2006年及以前的测深资料,已得知在曹妃甸填海工程修建的通道公路阻断浅滩潮道后的初期(2004年—2006年6月),老龙沟深槽有变浅和淤积的趋势。现研究了在通道公路阻断浅滩潮道后的中期(2006年7月—2008年)老龙沟深槽的变化趋势。根据2006年7月—2008年10月3个横切老龙沟深槽的测深剖面的对比分析,发现在该时间段内老龙沟深槽有一定加深和侵蚀的趋势。原因与人类活动密切相关,局部沟底有过抽沙活动,而且该时期也是曹妃甸填海工程最主要的施工期,大规模剧烈地从海中抽沙取土填海,取土规模达3~4亿t,也会引起老龙沟深槽的局部加深。Abstract: From the comparative analysis of the depth sounding data of 2006 and previous data, it is found that the Laolonggou deep trough was getting shallower and depositional in the initial stage (from 2004 to June of 2006) after the leading-to-island road constructed for Caofeidian reclamation project blocked the shoal tidal channel. This article focuses on the Laolonggou deep trough topographic change trend in the middle stage from July of 2006 to 2008 after the leading-to-island road cut off the shoal tidal channel. According to the comparative study of three depth sounding profiles crossing the Laolonggou deep trough from July of 2006 to October of 2008, it was found that the Laolonggou deep trough tended to be deeper and erosive. The reason for the depth change in this period is that the trough was partially dredged around its entrance, and a great amount of sediments up to 3~4 hundreds of millions tons has been taken from the seafloor for the need of land reclamation.
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