澜沧江西瓜滩至勐宋滩滩群航道整治方案

基于澜沧江244界碑至临沧港IV级航道建设工程,以西瓜滩—勐宋滩滩群为依托,阐述滩群河道特征和水文特性。针对大比降、大流速峡谷河段滩群航道尺度不足,单滩整治造成上游滩险水位跌落和流速、比降不利变化,从而形成新的碍航问题,对各滩演变进行分析并总结整治经验,对单滩碍航特点和滩群碍航特点进行研究,采用清礁措施扩大过水断面的方法,解决了单滩航道尺度不足的问题。采用逐段壅水、分段消化的壅疏结合方法,解决了滩险联动导致的水位跌落等问题。得出结论:在山区河流滩群整治过程中,采用清礁和筑坝相结合的方法,能够解决滩群联动相互影响的整治难题。

Regulation plan of Xigua-Mengsong shoals group in the Lancang River

Based on the project of four-level waterway construction from the Lancang River 244 mere Stone to Lincang Harbor and depending on the beaches from Xigua to Mengsong,this article illustrates the characteristics of waterway and hydrology.Because there are not enough waterway length and depth in the rivers and shoal groups of the canyon,single beach regulation causes the fall of river level in the upper shoals and the speed of the river and gradient slope change in a bad way,leading to new navigation obstacles.Analyzing the evolution rules of rapids and riverbeds and combining with the situations in the history,it researches the characteristics of the single shoal and shoal groups navigation obstacle,adopts the method of enlarging water-carrying section in the way of cleaning the rocks and solves the problem of single shoal navigation length and depth.Meanwhile,it adopts the combination of damming the river step by step and dredging in different sections to deal with the fall of the water level because of shoals and rapids connections.Therefore,it is concluded that the combination of cleaning rocks and damning can solve the puzzle of rapids connections and influences