Hyperpycnal flows are dense

formed when a sediment-laden fluid plunges into the bottom of a water body and flows basinward.After a large number of literature review

we summarized the development conditions

evolution process and depositional features of hyperpycnal flow.The formation of hyperpycnal flow is controlled by tectonic and climatic conditions

closely related to the location of the source-to-sink system.And the favorable conditions for its development are loose parent rocks

semi-arid climate

high elevation difference

low degree of evaporation of river drainage area

a significant slope at the river mouth and low-density water body.Typically

sedimentary sequence of hyperpycnites can reflect the evolution of hyperpycnal flow energy.To identify hyperpycnites

we should pay attention to important features such as coupling of inverse and normal grading (Ha-Hb)

internal mutation/erosion contact

typical flowing depositional structures and concentration of plant debris.Based on previous workers'studies

we established an ideal model of hyperpycnal facies consisting of channel-filling sedimentation

channel margin sedimentation

natural levees and front lobes.