沿盆地长轴方向，在坡降缓、斜坡长的古地形等条件下，源远流长地巨大的定向曲流河携带大量的泥沙进入湖盆，在河湖作用过渡带形成曲流河三角洲沉积体。

The immense oriented meandering river, along the long axis of the depression and with the gentle declivity and long slope, carried a large amount of mud and sand into the lake basin.

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在东北部缓坡带发育辫状河三角洲，而在西北部缓坡带则发育曲流河三角洲。

There is braided river delta sedimentary system in the northeast of the gentle slope, while delta in the northwest.

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