Operation mode of canal system in freezing period
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Abstract:
In order to study the relationship between the operation mode of the system and the ice jam, the parameters such as flow rate, Froude number, and water level deviation are taken as indexes. In terms of the selection of conventional operation mode, it is considered that the risk of ice jam caused by the operation of the upstream constant water level is the least, the adjustment and control of the gate during the operation of the down stream constant water level is timely , and the equal volume operation mode is moderate. When the frozen canal pool is frozen, the operation mode of the canal pool is changed from the downstream constant w ater level to the equal volume, resulting in the water level deviation of the canal system. The maximum velocity and the Froude number in the hydraulic response process are smaller than those in the downstream constant water level. The water level deviation in the upstream under simulated conditions decreases by nearly 50% and the maximum velocity decreases by approximately 6 . 5% , respectively . This indicates that switching operation mode is more conducive to maintaining the stability of the canal system during freezing and reducing the risk of an ice jam. Therefore, it is recommended that the frozen canal pool be switched from the downstream constant water level to the equal volume operation during the frozen period.
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