淮河中游河道近期演变分析

Analysis on recent channel evolution of middle reach of Huaihe River

根据河道实测资料分析了淮河中游河道的冲淤演变情况。结果表明,淮河中游各河段的冲淤特点不尽相同,主槽和滩地的冲淤规律也不相同,河道发生的变化与淮河中游的水沙条件密切相关。河段输沙总差值与断面法计算的冲淤量比较分析显示,近期人工采砂导致的河床变形远大于淮河中游的自然演变。河道冲刷扩大将有利于增加河道泄量,但无序采砂也将给河道稳定带来不利影响。

Based on the observed data of the river channel, the desihing evolution of the middle reach of Huaihe River is analyzed herein. The result shows that the desilting characteristics of all the river sections of the middle reach of Huaihe River are various, and then the desiring laws of both the main channel and the flood plains therein are also different ; for which the change of the channel is closely related to the runoff-sediment condition of the middle reach of Huaihe River. The comparative analysis made between the total difference-value of the sediment transport of the channel and the desilted amount calculated from the method of sections reveals that the deformation of the river bed caused by the recent sand mining is far beyond that from the natural evolution of the middle reach of the river. The enlargement of the channel scouring will favorable to the increase of the channel discharge, however, the illegal sand mining will be quite unfavorable to the stability of the channel as well.