Multi-objective synergetic reservoir operation in a sediment-laden river

•The primary requirements of multi-objective have been recognized and guaranteed.•MOSRR has been proposed to alleviate the fierce competition among multiple objectives.•MOSRR can achieve the equilibrium of primary and secondary requirements.•MOSRR improve multi-objective at the expense of a reduction in power generation.•MOSRR can combat runoff reduction by minimizing the damage of primary requirements.