黄河口尾闾河道断面形态的萎缩调整规律研究

Research on atrophy adjustment rules of cross section of tail channels in the Yellow River Estuary

采用实测资料分析和理论探讨相结合的方法,研究了水沙过程变异条件下,黄河口尾闾河道断面形态萎缩调整规律。研究结果表明,1986年后,黄河口水沙过程发生显著变异,尾闾河道断面形态萎缩十分明显,平滩面积大幅度减小,平滩宽深比有所增大;2002年后,小浪底水库实施调水调沙运用,黄河口水沙过程变异有所缓解,尾闾河道断面形态萎缩有所恢复,平滩面积明显增大,平滩宽深比大幅度减小,断面形态朝着窄深方向调整。通过引入尾闾河道断面形态萎缩的判别指标,可解决治理尾闾河道萎缩缺乏控制标准的问题。

Using the methods of data analysis and theoretical study,the atrophy adjustment rules of cross section were researched under the condition of variation of flow and sediment.The results show that the flow and sediment process in the Yellow River Estuary has showed significant variation since 1986,the atrophy of tail channels is quite obvious,the bank-full area has decreased greatly,and the width-depth ratio has increased.Since 2002,the regulation of flow and sediment of Xiaolangdi Reservoir has run successfully.The variation of flow and sediment has ameliorated in a certain extent,the atrophy of tail channels has been resumed,the bank-full area has increased clearly,the width-depth ratio has decreased heavily,and the direction of section configuration adjustment is narrow and deep.By introducing the atrophy distinguishing target of tail channels,the problem of lacking of the controlling criterion can be solved.