Abstract: In view of the problems appeared in Xiaobaita beach of Lancang Ｒiver，such as insufficient local water depths，irregular bilateral shorelines of the dredged channel，poor water flow state，flow velocity and gradient ratio exceeding the hydraulic parameters of rapids abating，etc． ，channel regulation is studied through a plane two dimensional numerical model．The channel regulation scheme adopts solving waterway scale，improving flow state，relieving rapids programs，etc． ． The results show that the regulation measures of cut-off works and reef explosions can smooth the shorelines and improve the flow state; the channel scales of the beach after engineering regulation can meet the grade requirements of channel planning．

Key words: waterway regulation, numerical simulation, rapids determination coefficient

摘要： 针对澜沧江小白塔滩出现的局部水深不足、航槽岸线不规则、水流流态较差、洪水期流速与比降组合超过消滩水力指标等问题，采用“航道尺度解决、流态改善、急滩缓解”等方案，应用平面二维水流数学模型进行航道整治研究。研究表明: “切嘴”“炸礁”等整治措施具有平顺岸线、改善流态等作用，整治后的滩段航道尺度可满足规划航道等级要求。

关键词: 航道整治, 数学模型, 消滩判数