黄河下游泥沙输移数值模拟

本文从数学模型入手,探讨黄河下游在多年平均来水来沙条件下,泥沙输移与泥沙淤积的特性,得出黄河下游泥沙沿程淤积分布不均匀主要是由于粗沙、中沙沿程淤积不均匀造成的,如果使来沙减少42.6%,黄河下游可望达到冲淤平衡.

MATHEMATICAL APPROACH TO THE SEDIMENTS TRANSPORT IN THE LOWER YELLOW RIVER

From mathematical model, this paper deals with the characters of sediments transport and deposits of the Lower Yellow River on the average of water and sediments of multiple years and obtains the quantities of sediments reduced when the equilibrium of scour and deposit of sediments is reached in the Lower Yellow River. The results are got as follows.1. It is Possible to use the movable-bed mathematical model of nonequi-librium transport of nonuniform sediment in order to inquire into the characters of sediments transport in the Lower Yellow River. The numerical results conform with the field investigations fundamentally.2. The nonuniformity of longitudinal deposits of sediment in the Lower Yellow River is caused by the nonuniformity of longitudinal deposits of coarse and middle sediments. This c onclusion shows that the relationship of contrast of sediments and capacity of sediments transport is different in the sections of river. Generally, sediments conform with the capacity of sediments transport better nearer to the mouth of river.3. The policy of primary and secondary may be taken to bring the Lower Yellow River under control according to the character of sediments deposit. The Coarse and middle sediments are 79.5% in all the sediment deposits, but only 43.3% in the sediments. The river channel has lower ability to transport the coarse and middle sediments. So the coarse and middle sediment must be reduced in the sediments.4. The numerical results show that if the quantities of sediments can be reduced to 42. 6%, the equilibrium of scour and deposit of sediments will be readied in the Lower Yellow River