Morphological change and siltation in North Passage Deep Waterways in Yangtze Estuary, China

Taking the North Passage of the Yangtze Estuary as a research object, based on topographic dataand maintenance dredging materials of deep-water channel from Dec.1997 to Feb. 2013, morphological change andsiltation of the North Passage Deep Waterways were analyzed. Results show:(1) there were wide range deposition inthe north beach of the North Passage upside; the south beach of the North Passage downside presented widespreaddeposition; the bend section was focused area to silt; the channel form developed to the direction of narrow and deep;(2) siltation were large amount about 64 million m3 since the three phase 12.5 m waterway project with section andseason difference;(3) siltation distribution was great different along the North Passage channel, siltation volume ofmiddle section(H-O) accounts for 70% of total volume;(4) siltation was great different during flood season and dryseason, siltation volume during flood season accounts for 80% above of yearly volume;(5) siltation in the south sec-tion was higher than the north section of about 4 million m3 to 13 million m3;(6) siltation distribution during threephase 12.5 m waterway project was different with two phase 10 m waterway project.