Effects of discharge hydrograph on bankfull discharge

The analysis of the relationship between annual bankfull discharge and inflow mainly focuses on the quantity of runoff and sediment loadat the annual scale (such as water amount, sediment load, and water-sediment coefficient) . Some researchers may also consider some specific characteristics such as peak discharge. However, few studies focus on the discharge hydrograph. We collected measured data of discharge and cross-sections at Huayuankou Hydrology Station during 1954-2000, and adopted flow duration curve (FDC) to describe the discharge hydrograph. Then, we used improved MOL method to estimate the bankfull discharge at different temporal scales, both annual and real-time. The relationship between the coefficients of FDCs and bankfull depth ( annual and real-time) was investigated. The analysis showed that when the discharge changed dramatically, the bankfull discharge was more likely to change, and so was the morphology of cross-sections. In conclusion, in addition to the quantity of runoff and sediment load, discharge hydrograph may also influence the bankfull discharge ( annual and real-time) .

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