Submerged macrophytes is key community in shallow lake ecosystem.It plays important role in water environmental quality and aquicolous ecosystem structure.
Northeast is low-angle slope, develop constructive potamic-lake delta, The delta from headstream to lake, extend very long, sediment complex and Microfacies multiplicity.
The sedimentary facies in Heshilafu is an alluvial fan - fan delta -lake systetn, and it can be further devided into several parfacies including microfacies.
From some field investigations (like Lake Constance and Lake Mead), the shape of a delta is not a Gilbert delta.Slope evolution between foreset and bottomset is not sharp but smooth.
The study on digifax of integrated water resource plan of Taihu basin set up a digital system over the lake basin, which included pollution load model and the water quality model.
It was only a bayou in the ancient time and later on it became a lake for the tide had brought sand to the bayou.After numerous constructions, it became a semi-closed adlittoral lake.