Water and sediment changes at the Shizuishan hydrologic station in the Yellow River

In order to explore the water and sediment processes at the Shizuishan hydrologic station in the Yellow River and to provide information for the Haibowan reservoir management,nonlinear statistical techniques were used to investigate the water and sediment changes from 1951 to 2016.The results showed that the temporal distributions of water and sediment at the Shizuishan station was uneven,and the changes during the 1960s were larger.Both annual runoff and annual sediment discharges showed statistically significant decreasing trends,which had a positive continuity and lasted for about 8 and 10 years.The step-changes of streamflow and sediment discharge occurred in 1986 and 1968,respectively,and the main reason for these changes was the coustruction of large reservoirs in the upper reaches of the Yellow River.Both reservoirs had significant impacts on streamflow and sediment discharge,and the streamflow discharge was always below 2 000m3/s after the operations of these two reservoirs.The intraannual and interannual distributions of streamflow and sediment discharges were also tended to be even.The relationship between water and sediment was re-adjusted in different periods,although its adjustment magnitude was minor.The average annual sediment concentration and average incoming sediment coefficient were significantly lower after the operation of Liujiaxia reservoir,but remained almost the same after the operations of Long and Liu reservoirs.

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