Quantitative Analysis of the Influence of the Xiaolangdi Reservoir on Water and Sediment in the Middle and Lower Reaches of the Yellow River.

As can be known from Figure 6 , both annual runoff and sediment transport show a decreasing trend, and before the operation of the Xiaolangdi Reservoir, sediment transport, and runoff changed in the same trend and fluctuate widely.

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As can be seen from Figure 7 f, the Lijin station passed the abrupt change test in 1974–1983 and 1985–2021, indicating an increasing trend of decrease during that period.

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As seen in Figure 7 c, the abrupt change test is broken at the Takamura station from 1973–1983 and 1990–2021, indicating a significant trend of decreasing runoff during that period, and the existence of an abrupt change point in 1973, indicating an abrupt change in runoff in 1973.

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