主泓

古河谷的中部，靠近主泓线附近，沉积层序完整。

In the middle of the incised - valley , stratigraphic sequence was perfect .

在主泓南移、气候由湿变干、分汊淤浅的背景下，大量人口由北方迁入，促使沿长江主泓的围堤迅速发展。

The embankment along the main channel has quickly developed as a result of population moving from the North China to this area .

造成马湖崩岸的原因：⑴长江河道主泓的持续南迁，是造成崩岸的主要地质因素；

The causes of bank collapse of Mahu dyke are : ( 1 ) The trunk stream of the Yangtze River moves continually towards south , this is the main geological factor causing the bank collapses .

航道主泓位置的变化对口外地形变化有明显影响，近几年南、北港分流分沙比较为稳定，对稳定北槽口外地形有利；

The main stream line of the distributary moving and swaying can affect the terrain change out of estuary . Recently , flow and sediment ratio of North and South passage is steady , so it is help to the terrain out of estuary .

长江河道的变迁受到诸多因素的影响，科氏力的作用是长江口不断南偏这一发展总趋势的主要原因，海平面上升与气候的变化则是长江主泓南北摆动的主要影响因素。

The migration to the south of the Yangtze River channel was mainly controlled by the Coriolis force , and the swing to the south or to the north of the main channel was mainly influenced by the sea level rise and climatic changes .