曹娥江大闸闸上江道冲刷研究数学模型设计和验证计算

Design of mathematic model for study on scouring of river channel above Cao'e River Sluice and its verification calculation

曹娥江大闸兴建后,平时关闸挡潮,阻挡了曹娥江上游泥沙的下泄通道,改变了闸上江道水流泥沙运动规律。在洪水期和非汛期有余水时开闸放水,闸上河道由原"洪冲潮淤"变为单向冲刷,危及两岸堤防的安全。因此,有必要对曹娥江河道的水流及泥沙冲淤变化情况进行预测,为曹娥江堤防工程的防护提供科学的依据。针对上述情况,文中阐述了平面二维水流泥沙数学模型的建立和验证计算及得出的初步结论。

After the completion of the Cao＇ e River Sluice, the sluice is usually closed to block the tide. Consequently, the sediment from the upstream of the river can not go to the sea, and then the sediment movement law of this river channel is changed. The sluice is only open during flood period and non-flood seasons when the river has redundant water. Therefore, the upstream channel of the river is changed from ＂scouring during flood and silting during tide＂ to a single-direction scouring,, which endangers the safety of the levees on both the sides. Under this circumstance, it is necessary to predict the variations of both the water flow and the desilting of the channel, so as to provide a scientific basis for the protection of the levees of the river. For this purpose, a 2-D flow and sediment mathematic model is established, and then the verification calculation is also made herein, for which the elementary conclusion is given as well.