The river mouth sand bar show a strong energy onthe top of main sand body, the strong energy of the distributary channelsand is at te bottom of the sand body, meanwhile uplying event of thesand body has a low relief .
1.Two types of sedimentary facies, the fluvial facies and lake facies, are recognized in the Matoushan Formation and the top part of the underlying Puchanghe formation. From below upwards, the sequence of sedimentary environments is shallow-shore-lake →river → fluvial-crevasse fan → the overbank lakes→the alluvial fan →dry shallow-lake.
The paper studies the feasibility to excavate coal under the river from renewing the function to damaged river and security and economic and draw a conclusion that excavate coal under the river is feasible.
In addition to possible unfavourable effects on flood control and navigation safety,the sand and gravel mining may also bring about significant effects on flushing sediment in the river channel and on river resime.
Analysis on depositional system and discussion on ore-formation conditions of channel sandstone type uranium deposit--taking Dongsheng area,Ordos Meso-Cenozoic basin as an example
In addition to possible unfavourable effects on flood control and navigation safety,the sand and gravel mining may also bring about significant effects on flushing sediment in the river channel and on river resime.
The river channel sandbodies in the Xishanyao Formation and the subaqueous distributary channel sandbodies in the delta front of Sanjianfang Formation contain mainly secondary solution pores,and have high porosity and high permeability.