黄河流域产水产沙系统的划分及中游重点区的编码

黄河流域来水来沙的一个显著特点为水沙异源,不同区的水沙特点不尽相同,其对下游河道冲淤演变的影响也不相同.为探求下游河道泥沙淤积与来源区的关系等问题,有必要对黄河流域进行分区考虑.基于前人对黄河流域分区的成果,在保证支流流域完整性的前提下,将花园口以上的产水产沙子系统划分为4个一级区,并将各个一级区进一步划分为若干个二级区.然后对中游重点区进行河网提取及编码应用,编码后的中游重点区共有12万条河段,包含7级河流.此外,在提取河网的基础上,利用编码的便利统计了各支流的流域面积、河网密度等信息.本文研究结合黄河数字流域平台,能为分析中游水沙来源区与下游河道淤积的关系提供依据.

Catchment division of the water and sediment yield system and drainage network codification of the key region in the middle Yellow River basin

The water and sediment yield in the Yellow River basin has such characteristic that the runoff and sediment come from different source areas are usually different,which makes different contribution to the sedimentation in the Lower Yellow River. So it is necessary to divide the drainage basin into different regions.An overview of previous achievements is first presented,and a modified division is then applied to the water and sediment yield system based on the principle of complete tributaries.The key regio...