The algorithm of check gates operation for different schemes of water demand of offtakes as well as the hydraulic performances of the conveyance main canal under the condition of constant downstream depth operation was studied by means of numerical simulation. The operation schemes of the check gates includes： the gates opened in sequence,synchronously opened and reversely opened in sequence. The hydraulic characteristics to be studied are water level deviation upstream of the check gates,hydraulic transient duration and check gate operation duration. The results show that the shortest check gate operation duration can be attained if the gates are to be opened in sequence and the longest is happened to the scheme of check gates opened reversely in sequence. The shortest hydraulic transient duration happened to the scheme of synchronously opened and longest duration is corresponding to the scheme of opened in sequence reversely. As for the water level deviation upstream of the check gates,it exhibits nearly the same for three modes of operation.%分析了南水北调中线总干渠在闸前常水位运行方式下,满足分水口群用水需求的节制闸控制方式和算法,通过数值仿真,重点研究了分水口群分别采用顺序运用方式、同步运用方式及逆序运用方式时,总干渠在闸前水位偏差、水力过渡时间和闸门操作历时等水力控制指标方面的差别。研究表明,闸门操作历时在顺序运用方式下最短,逆序运用方式下最长;水力过渡时间在同步运用方式下最短,逆序运用方式下最长;而闸前水位偏差指标在三种运用方式下相同。
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